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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.TestApi;
import android.compat.annotation.UnsupportedAppUsage;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.HardwareRenderer;
import android.graphics.Picture;
import android.graphics.RecordingCanvas;
import android.graphics.Rect;
import android.graphics.RenderNode;
import android.os.Build;
import android.os.Debug;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import libcore.util.HexEncoding;
import java.io.BufferedOutputStream;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.HashMap;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Function;
import java.util.stream.Stream;
/**
* Various debugging/tracing tools related to {@link View} and the view hierarchy.
*/
public class ViewDebug {
/**
* @deprecated This flag is now unused
*/
@Deprecated
public static final boolean TRACE_HIERARCHY = false;
/**
* @deprecated This flag is now unused
*/
@Deprecated
public static final boolean TRACE_RECYCLER = false;
/**
* Enables detailed logging of drag/drop operations.
* @hide
*/
public static final boolean DEBUG_DRAG = false;
/**
* Enables detailed logging of task positioning operations.
* @hide
*/
public static final boolean DEBUG_POSITIONING = false;
/**
* This annotation can be used to mark fields and methods to be dumped by
* the view server. Only non-void methods with no arguments can be annotated
* by this annotation.
*/
@Target({ ElementType.FIELD, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface ExportedProperty {
/**
* When resolveId is true, and if the annotated field/method return value
* is an int, the value is converted to an Android's resource name.
*
* @return true if the property's value must be transformed into an Android
* resource name, false otherwise
*/
boolean resolveId() default false;
/**
* A mapping can be defined to map int values to specific strings. For
* instance, View.getVisibility() returns 0, 4 or 8. However, these values
* actually mean VISIBLE, INVISIBLE and GONE. A mapping can be used to see
* these human readable values:
*
*
* {@literal @}ViewDebug.ExportedProperty(mapping = {
* {@literal @}ViewDebug.IntToString(from = 0, to = "VISIBLE"),
* {@literal @}ViewDebug.IntToString(from = 4, to = "INVISIBLE"),
* {@literal @}ViewDebug.IntToString(from = 8, to = "GONE")
* })
* public int getVisibility() { ...
*
*
* @return An array of int to String mappings
*
* @see android.view.ViewDebug.IntToString
*/
IntToString[] mapping() default { };
/**
* A mapping can be defined to map array indices to specific strings.
* A mapping can be used to see human readable values for the indices
* of an array:
*
*
* {@literal @}ViewDebug.ExportedProperty(indexMapping = {
* {@literal @}ViewDebug.IntToString(from = 0, to = "INVALID"),
* {@literal @}ViewDebug.IntToString(from = 1, to = "FIRST"),
* {@literal @}ViewDebug.IntToString(from = 2, to = "SECOND")
* })
* private int[] mElements;
*
*
* @return An array of int to String mappings
*
* @see android.view.ViewDebug.IntToString
* @see #mapping()
*/
IntToString[] indexMapping() default { };
/**
* A flags mapping can be defined to map flags encoded in an integer to
* specific strings. A mapping can be used to see human readable values
* for the flags of an integer:
*
*
* {@literal @}ViewDebug.ExportedProperty(flagMapping = {
* {@literal @}ViewDebug.FlagToString(mask = ENABLED_MASK, equals = ENABLED,
* name = "ENABLED"),
* {@literal @}ViewDebug.FlagToString(mask = ENABLED_MASK, equals = DISABLED,
* name = "DISABLED"),
* })
* private int mFlags;
*
*
* A specified String is output when the following is true:
*
* @return An array of int to String mappings
*/
FlagToString[] flagMapping() default { };
/**
* When deep export is turned on, this property is not dumped. Instead, the
* properties contained in this property are dumped. Each child property
* is prefixed with the name of this property.
*
* @return true if the properties of this property should be dumped
*
* @see #prefix()
*/
boolean deepExport() default false;
/**
* The prefix to use on child properties when deep export is enabled
*
* @return a prefix as a String
*
* @see #deepExport()
*/
String prefix() default "";
/**
* Specifies the category the property falls into, such as measurement,
* layout, drawing, etc.
*
* @return the category as String
*/
String category() default "";
/**
* Indicates whether or not to format an {@code int} or {@code byte} value as a hex string.
*
* @return true if the supported values should be formatted as a hex string.
*/
boolean formatToHexString() default false;
/**
* Indicates whether or not the key to value mappings are held in adjacent indices.
*
* Note: Applies only to fields and methods that return String[].
*
* @return true if the key to value mappings are held in adjacent indices.
*/
boolean hasAdjacentMapping() default false;
}
/**
* Defines a mapping from an int value to a String. Such a mapping can be used
* in an @ExportedProperty to provide more meaningful values to the end user.
*
* @see android.view.ViewDebug.ExportedProperty
*/
@Target({ ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface IntToString {
/**
* The original int value to map to a String.
*
* @return An arbitrary int value.
*/
int from();
/**
* The String to use in place of the original int value.
*
* @return An arbitrary non-null String.
*/
String to();
}
/**
* Defines a mapping from a flag to a String. Such a mapping can be used
* in an @ExportedProperty to provide more meaningful values to the end user.
*
* @see android.view.ViewDebug.ExportedProperty
*/
@Target({ ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface FlagToString {
/**
* The mask to apply to the original value.
*
* @return An arbitrary int value.
*/
int mask();
/**
* The value to compare to the result of:
* original value & {@link #mask()}.
*
* @return An arbitrary value.
*/
int equals();
/**
* The String to use in place of the original int value.
*
* @return An arbitrary non-null String.
*/
String name();
/**
* Indicates whether to output the flag when the test is true,
* or false. Defaults to true.
*/
boolean outputIf() default true;
}
/**
* This annotation can be used to mark fields and methods to be dumped when
* the view is captured. Methods with this annotation must have no arguments
* and must return a valid type of data.
*/
@Target({ ElementType.FIELD, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface CapturedViewProperty {
/**
* When retrieveReturn is true, we need to retrieve second level methods
* e.g., we need myView.getFirstLevelMethod().getSecondLevelMethod()
* we will set retrieveReturn = true on the annotation of
* myView.getFirstLevelMethod()
* @return true if we need the second level methods
*/
boolean retrieveReturn() default false;
}
/**
* Allows a View to inject custom children into HierarchyViewer. For example,
* WebView uses this to add its internal layer tree as a child to itself
* @hide
*/
public interface HierarchyHandler {
/**
* Dumps custom children to hierarchy viewer.
* See ViewDebug.dumpViewWithProperties(Context, View, BufferedWriter, int)
* for the format
*
* An empty implementation should simply do nothing
*
* @param out The output writer
* @param level The indentation level
*/
public void dumpViewHierarchyWithProperties(BufferedWriter out, int level);
/**
* Returns a View to enable grabbing screenshots from custom children
* returned in dumpViewHierarchyWithProperties.
*
* @param className The className of the view to find
* @param hashCode The hashCode of the view to find
* @return the View to capture from, or null if not found
*/
public View findHierarchyView(String className, int hashCode);
}
private abstract static class PropertyInfo {
public final R member;
public final T property;
public final String name;
public final Class returnType;
public String entrySuffix = "";
public String valueSuffix = "";
PropertyInfo(Class property, R member, Class returnType) {
this.member = member;
this.name = member.getName();
this.property = member.getAnnotation(property);
this.returnType = returnType;
}
public abstract Object invoke(Object target) throws Exception;
static PropertyInfo forMethod(Method method,
Class property) {
// Ensure the method return and parameter types can be resolved.
try {
if ((method.getReturnType() == Void.class)
|| (method.getParameterTypes().length != 0)) {
return null;
}
} catch (NoClassDefFoundError e) {
return null;
}
if (!method.isAnnotationPresent(property)) {
return null;
}
method.setAccessible(true);
PropertyInfo info = new MethodPI(method, property);
info.entrySuffix = "()";
info.valueSuffix = ";";
return info;
}
static PropertyInfo forField(Field field, Class property) {
if (!field.isAnnotationPresent(property)) {
return null;
}
field.setAccessible(true);
return new FieldPI<>(field, property);
}
}
private static class MethodPI extends PropertyInfo {
MethodPI(Method method, Class property) {
super(property, method, method.getReturnType());
}
@Override
public Object invoke(Object target) throws Exception {
return member.invoke(target);
}
}
private static class FieldPI extends PropertyInfo {
FieldPI(Field field, Class property) {
super(property, field, field.getType());
}
@Override
public Object invoke(Object target) throws Exception {
return member.get(target);
}
}
// Maximum delay in ms after which we stop trying to capture a View's drawing
private static final int CAPTURE_TIMEOUT = 6000;
private static final String REMOTE_COMMAND_CAPTURE = "CAPTURE";
private static final String REMOTE_COMMAND_DUMP = "DUMP";
private static final String REMOTE_COMMAND_DUMP_THEME = "DUMP_THEME";
/**
* Similar to REMOTE_COMMAND_DUMP but uses ViewHierarchyEncoder instead of flat text
* @hide
*/
public static final String REMOTE_COMMAND_DUMP_ENCODED = "DUMP_ENCODED";
private static final String REMOTE_COMMAND_INVALIDATE = "INVALIDATE";
private static final String REMOTE_COMMAND_REQUEST_LAYOUT = "REQUEST_LAYOUT";
private static final String REMOTE_PROFILE = "PROFILE";
private static final String REMOTE_COMMAND_CAPTURE_LAYERS = "CAPTURE_LAYERS";
private static final String REMOTE_COMMAND_OUTPUT_DISPLAYLIST = "OUTPUT_DISPLAYLIST";
private static HashMap, PropertyInfo[]> sExportProperties;
private static HashMap, PropertyInfo[]>
sCapturedViewProperties;
/**
* @deprecated This enum is now unused
*/
@Deprecated
public enum HierarchyTraceType {
INVALIDATE,
INVALIDATE_CHILD,
INVALIDATE_CHILD_IN_PARENT,
REQUEST_LAYOUT,
ON_LAYOUT,
ON_MEASURE,
DRAW,
BUILD_CACHE
}
/**
* @deprecated This enum is now unused
*/
@Deprecated
public enum RecyclerTraceType {
NEW_VIEW,
BIND_VIEW,
RECYCLE_FROM_ACTIVE_HEAP,
RECYCLE_FROM_SCRAP_HEAP,
MOVE_TO_SCRAP_HEAP,
MOVE_FROM_ACTIVE_TO_SCRAP_HEAP
}
/**
* Returns the number of instanciated Views.
*
* @return The number of Views instanciated in the current process.
*
* @hide
*/
@UnsupportedAppUsage
public static long getViewInstanceCount() {
return Debug.countInstancesOfClass(View.class);
}
/**
* Returns the number of instanciated ViewAncestors.
*
* @return The number of ViewAncestors instanciated in the current process.
*
* @hide
*/
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public static long getViewRootImplCount() {
return Debug.countInstancesOfClass(ViewRootImpl.class);
}
/**
* @deprecated This method is now unused and invoking it is a no-op
*/
@Deprecated
@SuppressWarnings({ "UnusedParameters", "deprecation" })
public static void trace(View view, RecyclerTraceType type, int... parameters) {
}
/**
* @deprecated This method is now unused and invoking it is a no-op
*/
@Deprecated
@SuppressWarnings("UnusedParameters")
public static void startRecyclerTracing(String prefix, View view) {
}
/**
* @deprecated This method is now unused and invoking it is a no-op
*/
@Deprecated
@SuppressWarnings("UnusedParameters")
public static void stopRecyclerTracing() {
}
/**
* @deprecated This method is now unused and invoking it is a no-op
*/
@Deprecated
@SuppressWarnings({ "UnusedParameters", "deprecation" })
public static void trace(View view, HierarchyTraceType type) {
}
/**
* @deprecated This method is now unused and invoking it is a no-op
*/
@Deprecated
@SuppressWarnings("UnusedParameters")
public static void startHierarchyTracing(String prefix, View view) {
}
/**
* @deprecated This method is now unused and invoking it is a no-op
*/
@Deprecated
public static void stopHierarchyTracing() {
}
@UnsupportedAppUsage
static void dispatchCommand(View view, String command, String parameters,
OutputStream clientStream) throws IOException {
// Just being cautious...
view = view.getRootView();
if (REMOTE_COMMAND_DUMP.equalsIgnoreCase(command)) {
dump(view, false, true, clientStream);
} else if (REMOTE_COMMAND_DUMP_THEME.equalsIgnoreCase(command)) {
dumpTheme(view, clientStream);
} else if (REMOTE_COMMAND_DUMP_ENCODED.equalsIgnoreCase(command)) {
dumpEncoded(view, clientStream);
} else if (REMOTE_COMMAND_CAPTURE_LAYERS.equalsIgnoreCase(command)) {
captureLayers(view, new DataOutputStream(clientStream));
} else {
final String[] params = parameters.split(" ");
if (REMOTE_COMMAND_CAPTURE.equalsIgnoreCase(command)) {
capture(view, clientStream, params[0]);
} else if (REMOTE_COMMAND_OUTPUT_DISPLAYLIST.equalsIgnoreCase(command)) {
outputDisplayList(view, params[0]);
} else if (REMOTE_COMMAND_INVALIDATE.equalsIgnoreCase(command)) {
invalidate(view, params[0]);
} else if (REMOTE_COMMAND_REQUEST_LAYOUT.equalsIgnoreCase(command)) {
requestLayout(view, params[0]);
} else if (REMOTE_PROFILE.equalsIgnoreCase(command)) {
profile(view, clientStream, params[0]);
}
}
}
/** @hide */
public static View findView(View root, String parameter) {
// Look by type/hashcode
if (parameter.indexOf('@') != -1) {
final String[] ids = parameter.split("@");
final String className = ids[0];
final int hashCode = (int) Long.parseLong(ids[1], 16);
View view = root.getRootView();
if (view instanceof ViewGroup) {
return findView((ViewGroup) view, className, hashCode);
}
} else {
// Look by id
final int id = root.getResources().getIdentifier(parameter, null, null);
return root.getRootView().findViewById(id);
}
return null;
}
private static void invalidate(View root, String parameter) {
final View view = findView(root, parameter);
if (view != null) {
view.postInvalidate();
}
}
private static void requestLayout(View root, String parameter) {
final View view = findView(root, parameter);
if (view != null) {
root.post(new Runnable() {
public void run() {
view.requestLayout();
}
});
}
}
private static void profile(View root, OutputStream clientStream, String parameter)
throws IOException {
final View view = findView(root, parameter);
BufferedWriter out = null;
try {
out = new BufferedWriter(new OutputStreamWriter(clientStream), 32 * 1024);
if (view != null) {
profileViewAndChildren(view, out);
} else {
out.write("-1 -1 -1");
out.newLine();
}
out.write("DONE.");
out.newLine();
} catch (Exception e) {
android.util.Log.w("View", "Problem profiling the view:", e);
} finally {
if (out != null) {
out.close();
}
}
}
/** @hide */
public static void profileViewAndChildren(final View view, BufferedWriter out)
throws IOException {
RenderNode node = RenderNode.create("ViewDebug", null);
profileViewAndChildren(view, node, out, true);
}
private static void profileViewAndChildren(View view, RenderNode node, BufferedWriter out,
boolean root) throws IOException {
long durationMeasure =
(root || (view.mPrivateFlags & View.PFLAG_MEASURED_DIMENSION_SET) != 0)
? profileViewMeasure(view) : 0;
long durationLayout =
(root || (view.mPrivateFlags & View.PFLAG_LAYOUT_REQUIRED) != 0)
? profileViewLayout(view) : 0;
long durationDraw =
(root || !view.willNotDraw() || (view.mPrivateFlags & View.PFLAG_DRAWN) != 0)
? profileViewDraw(view, node) : 0;
out.write(String.valueOf(durationMeasure));
out.write(' ');
out.write(String.valueOf(durationLayout));
out.write(' ');
out.write(String.valueOf(durationDraw));
out.newLine();
if (view instanceof ViewGroup) {
ViewGroup group = (ViewGroup) view;
final int count = group.getChildCount();
for (int i = 0; i < count; i++) {
profileViewAndChildren(group.getChildAt(i), node, out, false);
}
}
}
private static long profileViewMeasure(final View view) {
return profileViewOperation(view, new ViewOperation() {
@Override
public void pre() {
forceLayout(view);
}
private void forceLayout(View view) {
view.forceLayout();
if (view instanceof ViewGroup) {
ViewGroup group = (ViewGroup) view;
final int count = group.getChildCount();
for (int i = 0; i < count; i++) {
forceLayout(group.getChildAt(i));
}
}
}
@Override
public void run() {
view.measure(view.mOldWidthMeasureSpec, view.mOldHeightMeasureSpec);
}
});
}
private static long profileViewLayout(View view) {
return profileViewOperation(view,
() -> view.layout(view.mLeft, view.mTop, view.mRight, view.mBottom));
}
private static long profileViewDraw(View view, RenderNode node) {
DisplayMetrics dm = view.getResources().getDisplayMetrics();
if (dm == null) {
return 0;
}
if (view.isHardwareAccelerated()) {
RecordingCanvas canvas = node.beginRecording(dm.widthPixels, dm.heightPixels);
try {
return profileViewOperation(view, () -> view.draw(canvas));
} finally {
node.endRecording();
}
} else {
Bitmap bitmap = Bitmap.createBitmap(
dm, dm.widthPixels, dm.heightPixels, Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
try {
return profileViewOperation(view, () -> view.draw(canvas));
} finally {
canvas.setBitmap(null);
bitmap.recycle();
}
}
}
interface ViewOperation {
default void pre() {}
void run();
}
private static long profileViewOperation(View view, final ViewOperation operation) {
final CountDownLatch latch = new CountDownLatch(1);
final long[] duration = new long[1];
view.post(() -> {
try {
operation.pre();
long start = Debug.threadCpuTimeNanos();
//noinspection unchecked
operation.run();
duration[0] = Debug.threadCpuTimeNanos() - start;
} finally {
latch.countDown();
}
});
try {
if (!latch.await(CAPTURE_TIMEOUT, TimeUnit.MILLISECONDS)) {
Log.w("View", "Could not complete the profiling of the view " + view);
return -1;
}
} catch (InterruptedException e) {
Log.w("View", "Could not complete the profiling of the view " + view);
Thread.currentThread().interrupt();
return -1;
}
return duration[0];
}
/** @hide */
public static void captureLayers(View root, final DataOutputStream clientStream)
throws IOException {
try {
Rect outRect = new Rect();
root.mAttachInfo.mViewRootImpl.getDisplayFrame(outRect);
clientStream.writeInt(outRect.width());
clientStream.writeInt(outRect.height());
captureViewLayer(root, clientStream, true);
clientStream.write(2);
} finally {
clientStream.close();
}
}
private static void captureViewLayer(View view, DataOutputStream clientStream, boolean visible)
throws IOException {
final boolean localVisible = view.getVisibility() == View.VISIBLE && visible;
if ((view.mPrivateFlags & View.PFLAG_SKIP_DRAW) != View.PFLAG_SKIP_DRAW) {
final int id = view.getId();
String name = view.getClass().getSimpleName();
if (id != View.NO_ID) {
name = resolveId(view.getContext(), id).toString();
}
clientStream.write(1);
clientStream.writeUTF(name);
clientStream.writeByte(localVisible ? 1 : 0);
int[] position = new int[2];
// XXX: Should happen on the UI thread
view.getLocationInWindow(position);
clientStream.writeInt(position[0]);
clientStream.writeInt(position[1]);
clientStream.flush();
Bitmap b = performViewCapture(view, true);
if (b != null) {
ByteArrayOutputStream arrayOut = new ByteArrayOutputStream(b.getWidth() *
b.getHeight() * 2);
b.compress(Bitmap.CompressFormat.PNG, 100, arrayOut);
clientStream.writeInt(arrayOut.size());
arrayOut.writeTo(clientStream);
}
clientStream.flush();
}
if (view instanceof ViewGroup) {
ViewGroup group = (ViewGroup) view;
int count = group.getChildCount();
for (int i = 0; i < count; i++) {
captureViewLayer(group.getChildAt(i), clientStream, localVisible);
}
}
if (view.mOverlay != null) {
ViewGroup overlayContainer = view.getOverlay().mOverlayViewGroup;
captureViewLayer(overlayContainer, clientStream, localVisible);
}
}
private static void outputDisplayList(View root, String parameter) throws IOException {
final View view = findView(root, parameter);
view.getViewRootImpl().outputDisplayList(view);
}
/** @hide */
public static void outputDisplayList(View root, View target) {
root.getViewRootImpl().outputDisplayList(target);
}
private static class PictureCallbackHandler implements AutoCloseable,
HardwareRenderer.PictureCapturedCallback, Runnable {
private final HardwareRenderer mRenderer;
private final Function mCallback;
private final Executor mExecutor;
private final ReentrantLock mLock = new ReentrantLock(false);
private final ArrayDeque mQueue = new ArrayDeque<>(3);
private boolean mStopListening;
private Thread mRenderThread;
private PictureCallbackHandler(HardwareRenderer renderer,
Function callback, Executor executor) {
mRenderer = renderer;
mCallback = callback;
mExecutor = executor;
mRenderer.setPictureCaptureCallback(this);
}
@Override
public void close() {
mLock.lock();
mStopListening = true;
mLock.unlock();
mRenderer.setPictureCaptureCallback(null);
}
@Override
public void onPictureCaptured(Picture picture) {
mLock.lock();
if (mStopListening) {
mLock.unlock();
mRenderer.setPictureCaptureCallback(null);
return;
}
if (mRenderThread == null) {
mRenderThread = Thread.currentThread();
}
Picture toDestroy = null;
if (mQueue.size() == 3) {
toDestroy = mQueue.removeLast();
}
mQueue.add(picture);
mLock.unlock();
if (toDestroy == null) {
mExecutor.execute(this);
} else {
toDestroy.close();
}
}
@Override
public void run() {
mLock.lock();
final Picture picture = mQueue.poll();
final boolean isStopped = mStopListening;
mLock.unlock();
if (Thread.currentThread() == mRenderThread) {
close();
throw new IllegalStateException(
"ViewDebug#startRenderingCommandsCapture must be given an executor that "
+ "invokes asynchronously");
}
if (isStopped) {
picture.close();
return;
}
final boolean keepReceiving = mCallback.apply(picture);
if (!keepReceiving) {
close();
}
}
}
/**
* Begins capturing the entire rendering commands for the view tree referenced by the given
* view. The view passed may be any View in the tree as long as it is attached. That is,
* {@link View#isAttachedToWindow()} must be true.
*
* Every time a frame is rendered a Picture will be passed to the given callback via the given
* executor. As long as the callback returns 'true' it will continue to receive new frames.
* The system will only invoke the callback at a rate that the callback is able to keep up with.
* That is, if it takes 48ms for the callback to complete and there is a 60fps animation running
* then the callback will only receive 33% of the frames produced.
*
* This method must be called on the same thread as the View tree.
*
* @param tree The View tree to capture the rendering commands.
* @param callback The callback to invoke on every frame produced. Should return true to
* continue receiving new frames, false to stop capturing.
* @param executor The executor to invoke the callback on. Recommend using a background thread
* to avoid stalling the UI thread. Must be an asynchronous invoke or an
* exception will be thrown.
* @return a closeable that can be used to stop capturing. May be invoked on any thread. Note
* that the callback may continue to receive another frame or two depending on thread timings.
* Returns null if the capture stream cannot be started, such as if there's no
* HardwareRenderer for the given view tree.
* @hide
* @deprecated use {@link #startRenderingCommandsCapture(View, Executor, Callable)} instead.
*/
@TestApi
@Nullable
@Deprecated
public static AutoCloseable startRenderingCommandsCapture(View tree, Executor executor,
Function callback) {
final View.AttachInfo attachInfo = tree.mAttachInfo;
if (attachInfo == null) {
throw new IllegalArgumentException("Given view isn't attached");
}
if (attachInfo.mHandler.getLooper() != Looper.myLooper()) {
throw new IllegalStateException("Called on the wrong thread."
+ " Must be called on the thread that owns the given View");
}
final HardwareRenderer renderer = attachInfo.mThreadedRenderer;
if (renderer != null) {
return new PictureCallbackHandler(renderer, callback, executor);
}
return null;
}
private static class StreamingPictureCallbackHandler implements AutoCloseable,
HardwareRenderer.PictureCapturedCallback, Runnable {
private final HardwareRenderer mRenderer;
private final Callable mCallback;
private final Executor mExecutor;
private final ReentrantLock mLock = new ReentrantLock(false);
private final ArrayDeque mQueue = new ArrayDeque<>(3);
private boolean mStopListening;
private Thread mRenderThread;
private StreamingPictureCallbackHandler(HardwareRenderer renderer,
Callable callback, Executor executor) {
mRenderer = renderer;
mCallback = callback;
mExecutor = executor;
mRenderer.setPictureCaptureCallback(this);
}
@Override
public void close() {
mLock.lock();
mStopListening = true;
mLock.unlock();
mRenderer.setPictureCaptureCallback(null);
}
@Override
public void onPictureCaptured(Picture picture) {
mLock.lock();
if (mStopListening) {
mLock.unlock();
mRenderer.setPictureCaptureCallback(null);
return;
}
if (mRenderThread == null) {
mRenderThread = Thread.currentThread();
}
boolean needsInvoke = true;
if (mQueue.size() == 3) {
mQueue.removeLast();
needsInvoke = false;
}
mQueue.add(picture);
mLock.unlock();
if (needsInvoke) {
mExecutor.execute(this);
}
}
@Override
public void run() {
mLock.lock();
final Picture picture = mQueue.poll();
final boolean isStopped = mStopListening;
mLock.unlock();
if (Thread.currentThread() == mRenderThread) {
close();
throw new IllegalStateException(
"ViewDebug#startRenderingCommandsCapture must be given an executor that "
+ "invokes asynchronously");
}
if (isStopped) {
return;
}
OutputStream stream = null;
try {
stream = mCallback.call();
} catch (Exception ex) {
Log.w("ViewDebug", "Aborting rendering commands capture "
+ "because callback threw exception", ex);
}
if (stream != null) {
try {
picture.writeToStream(stream);
stream.flush();
} catch (IOException ex) {
Log.w("ViewDebug", "Aborting rendering commands capture "
+ "due to IOException writing to output stream", ex);
}
} else {
close();
}
}
}
/**
* Begins capturing the entire rendering commands for the view tree referenced by the given
* view. The view passed may be any View in the tree as long as it is attached. That is,
* {@link View#isAttachedToWindow()} must be true.
*
* Every time a frame is rendered the callback will be invoked on the given executor to
* provide an OutputStream to serialize to. As long as the callback returns a valid
* OutputStream the capturing will continue. The system will only invoke the callback at a rate
* that the callback & OutputStream is able to keep up with. That is, if it takes 48ms for the
* callback & serialization to complete and there is a 60fps animation running
* then the callback will only receive 33% of the frames produced.
*
* This method must be called on the same thread as the View tree.
*
* @param tree The View tree to capture the rendering commands.
* @param callback The callback to invoke on every frame produced. Should return an
* OutputStream to write the data to. Return null to cancel capture. The
* same stream may be returned each time as the serialized data contains
* start & end markers. The callback will not be invoked while a previous
* serialization is being performed, so if a single continuous stream is being
* used it is valid for the callback to write its own metadata to that stream
* in response to callback invocation.
* @param executor The executor to invoke the callback on. Recommend using a background thread
* to avoid stalling the UI thread. Must be an asynchronous invoke or an
* exception will be thrown.
* @return a closeable that can be used to stop capturing. May be invoked on any thread. Note
* that the callback may continue to receive another frame or two depending on thread timings.
* Returns null if the capture stream cannot be started, such as if there's no
* HardwareRenderer for the given view tree.
* @hide
*/
@TestApi
@Nullable
public static AutoCloseable startRenderingCommandsCapture(View tree, Executor executor,
Callable callback) {
final View.AttachInfo attachInfo = tree.mAttachInfo;
if (attachInfo == null) {
throw new IllegalArgumentException("Given view isn't attached");
}
if (attachInfo.mHandler.getLooper() != Looper.myLooper()) {
throw new IllegalStateException("Called on the wrong thread."
+ " Must be called on the thread that owns the given View");
}
final HardwareRenderer renderer = attachInfo.mThreadedRenderer;
if (renderer != null) {
return new StreamingPictureCallbackHandler(renderer, callback, executor);
}
return null;
}
private static void capture(View root, final OutputStream clientStream, String parameter)
throws IOException {
final View captureView = findView(root, parameter);
capture(root, clientStream, captureView);
}
/** @hide */
public static void capture(View root, final OutputStream clientStream, View captureView)
throws IOException {
Bitmap b = performViewCapture(captureView, false);
if (b == null) {
Log.w("View", "Failed to create capture bitmap!");
// Send an empty one so that it doesn't get stuck waiting for
// something.
b = Bitmap.createBitmap(root.getResources().getDisplayMetrics(),
1, 1, Bitmap.Config.ARGB_8888);
}
BufferedOutputStream out = null;
try {
out = new BufferedOutputStream(clientStream, 32 * 1024);
b.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
} finally {
if (out != null) {
out.close();
}
b.recycle();
}
}
private static Bitmap performViewCapture(final View captureView, final boolean skipChildren) {
if (captureView != null) {
final CountDownLatch latch = new CountDownLatch(1);
final Bitmap[] cache = new Bitmap[1];
captureView.post(() -> {
try {
CanvasProvider provider = captureView.isHardwareAccelerated()
? new HardwareCanvasProvider() : new SoftwareCanvasProvider();
cache[0] = captureView.createSnapshot(provider, skipChildren);
} catch (OutOfMemoryError e) {
Log.w("View", "Out of memory for bitmap");
} finally {
latch.countDown();
}
});
try {
latch.await(CAPTURE_TIMEOUT, TimeUnit.MILLISECONDS);
return cache[0];
} catch (InterruptedException e) {
Log.w("View", "Could not complete the capture of the view " + captureView);
Thread.currentThread().interrupt();
}
}
return null;
}
/**
* Dumps the view hierarchy starting from the given view.
* @deprecated See {@link #dumpv2(View, ByteArrayOutputStream)} below.
* @hide
*/
@Deprecated
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public static void dump(View root, boolean skipChildren, boolean includeProperties,
OutputStream clientStream) throws IOException {
BufferedWriter out = null;
try {
out = new BufferedWriter(new OutputStreamWriter(clientStream, "utf-8"), 32 * 1024);
View view = root.getRootView();
if (view instanceof ViewGroup) {
ViewGroup group = (ViewGroup) view;
dumpViewHierarchy(group.getContext(), group, out, 0,
skipChildren, includeProperties);
}
out.write("DONE.");
out.newLine();
} catch (Exception e) {
android.util.Log.w("View", "Problem dumping the view:", e);
} finally {
if (out != null) {
out.close();
}
}
}
/**
* Dumps the view hierarchy starting from the given view.
* Rather than using reflection, it uses View's encode method to obtain all the properties.
* @hide
*/
public static void dumpv2(@NonNull final View view, @NonNull ByteArrayOutputStream out)
throws InterruptedException {
final ViewHierarchyEncoder encoder = new ViewHierarchyEncoder(out);
final CountDownLatch latch = new CountDownLatch(1);
view.post(new Runnable() {
@Override
public void run() {
encoder.addProperty("window:left", view.mAttachInfo.mWindowLeft);
encoder.addProperty("window:top", view.mAttachInfo.mWindowTop);
view.encode(encoder);
latch.countDown();
}
});
latch.await(2, TimeUnit.SECONDS);
encoder.endStream();
}
private static void dumpEncoded(@NonNull final View view, @NonNull OutputStream out)
throws IOException {
ByteArrayOutputStream baOut = new ByteArrayOutputStream();
final ViewHierarchyEncoder encoder = new ViewHierarchyEncoder(baOut);
encoder.setUserPropertiesEnabled(false);
encoder.addProperty("window:left", view.mAttachInfo.mWindowLeft);
encoder.addProperty("window:top", view.mAttachInfo.mWindowTop);
view.encode(encoder);
encoder.endStream();
out.write(baOut.toByteArray());
}
/**
* Dumps the theme attributes from the given View.
* @hide
*/
public static void dumpTheme(View view, OutputStream clientStream) throws IOException {
BufferedWriter out = null;
try {
out = new BufferedWriter(new OutputStreamWriter(clientStream, "utf-8"), 32 * 1024);
String[] attributes = getStyleAttributesDump(view.getContext().getResources(),
view.getContext().getTheme());
if (attributes != null) {
for (int i = 0; i < attributes.length; i += 2) {
if (attributes[i] != null) {
out.write(attributes[i] + "\n");
out.write(attributes[i + 1] + "\n");
}
}
}
out.write("DONE.");
out.newLine();
} catch (Exception e) {
android.util.Log.w("View", "Problem dumping View Theme:", e);
} finally {
if (out != null) {
out.close();
}
}
}
/**
* Gets the style attributes from the {@link Resources.Theme}. For debugging only.
*
* @param resources Resources to resolve attributes from.
* @param theme Theme to dump.
* @return a String array containing pairs of adjacent Theme attribute data: name followed by
* its value.
*
* @hide
*/
private static String[] getStyleAttributesDump(Resources resources, Resources.Theme theme) {
TypedValue outValue = new TypedValue();
String nullString = "null";
int i = 0;
int[] attributes = theme.getAllAttributes();
String[] data = new String[attributes.length * 2];
for (int attributeId : attributes) {
try {
data[i] = resources.getResourceName(attributeId);
data[i + 1] = theme.resolveAttribute(attributeId, outValue, true) ?
outValue.coerceToString().toString() : nullString;
i += 2;
// attempt to replace reference data with its name
if (outValue.type == TypedValue.TYPE_REFERENCE) {
data[i - 1] = resources.getResourceName(outValue.resourceId);
}
} catch (Resources.NotFoundException e) {
// ignore resources we can't resolve
}
}
return data;
}
private static View findView(ViewGroup group, String className, int hashCode) {
if (isRequestedView(group, className, hashCode)) {
return group;
}
final int count = group.getChildCount();
for (int i = 0; i < count; i++) {
final View view = group.getChildAt(i);
if (view instanceof ViewGroup) {
final View found = findView((ViewGroup) view, className, hashCode);
if (found != null) {
return found;
}
} else if (isRequestedView(view, className, hashCode)) {
return view;
}
if (view.mOverlay != null) {
final View found = findView((ViewGroup) view.mOverlay.mOverlayViewGroup,
className, hashCode);
if (found != null) {
return found;
}
}
if (view instanceof HierarchyHandler) {
final View found = ((HierarchyHandler)view)
.findHierarchyView(className, hashCode);
if (found != null) {
return found;
}
}
}
return null;
}
private static boolean isRequestedView(View view, String className, int hashCode) {
if (view.hashCode() == hashCode) {
String viewClassName = view.getClass().getName();
if (className.equals("ViewOverlay")) {
return viewClassName.equals("android.view.ViewOverlay$OverlayViewGroup");
} else {
return className.equals(viewClassName);
}
}
return false;
}
private static void dumpViewHierarchy(Context context, ViewGroup group,
BufferedWriter out, int level, boolean skipChildren, boolean includeProperties) {
cacheExportedProperties(group.getClass());
if (!skipChildren) {
cacheExportedPropertiesForChildren(group);
}
// Try to use the handler provided by the view
Handler handler = group.getHandler();
// Fall back on using the main thread
if (handler == null) {
handler = new Handler(Looper.getMainLooper());
}
if (handler.getLooper() == Looper.myLooper()) {
dumpViewHierarchyOnUIThread(context, group, out, level, skipChildren,
includeProperties);
} else {
FutureTask task = new FutureTask(() ->
dumpViewHierarchyOnUIThread(context, group, out, level, skipChildren,
includeProperties), null);
Message msg = Message.obtain(handler, task);
msg.setAsynchronous(true);
handler.sendMessage(msg);
while (true) {
try {
task.get(CAPTURE_TIMEOUT, java.util.concurrent.TimeUnit.MILLISECONDS);
return;
} catch (InterruptedException e) {
// try again
} catch (ExecutionException | TimeoutException e) {
// Something unexpected happened.
throw new RuntimeException(e);
}
}
}
}
private static void cacheExportedPropertiesForChildren(ViewGroup group) {
final int count = group.getChildCount();
for (int i = 0; i < count; i++) {
final View view = group.getChildAt(i);
cacheExportedProperties(view.getClass());
if (view instanceof ViewGroup) {
cacheExportedPropertiesForChildren((ViewGroup) view);
}
}
}
private static void cacheExportedProperties(Class klass) {
if (sExportProperties != null && sExportProperties.containsKey(klass)) {
return;
}
do {
for (PropertyInfo info : getExportedProperties(klass)) {
if (!info.returnType.isPrimitive() && info.property.deepExport()) {
cacheExportedProperties(info.returnType);
}
}
klass = klass.getSuperclass();
} while (klass != Object.class);
}
private static void dumpViewHierarchyOnUIThread(Context context, ViewGroup group,
BufferedWriter out, int level, boolean skipChildren, boolean includeProperties) {
if (!dumpView(context, group, out, level, includeProperties)) {
return;
}
if (skipChildren) {
return;
}
final int count = group.getChildCount();
for (int i = 0; i < count; i++) {
final View view = group.getChildAt(i);
if (view instanceof ViewGroup) {
dumpViewHierarchyOnUIThread(context, (ViewGroup) view, out, level + 1,
skipChildren, includeProperties);
} else {
dumpView(context, view, out, level + 1, includeProperties);
}
if (view.mOverlay != null) {
ViewOverlay overlay = view.getOverlay();
ViewGroup overlayContainer = overlay.mOverlayViewGroup;
dumpViewHierarchyOnUIThread(context, overlayContainer, out, level + 2,
skipChildren, includeProperties);
}
}
if (group instanceof HierarchyHandler) {
((HierarchyHandler)group).dumpViewHierarchyWithProperties(out, level + 1);
}
}
private static boolean dumpView(Context context, View view,
BufferedWriter out, int level, boolean includeProperties) {
try {
for (int i = 0; i < level; i++) {
out.write(' ');
}
String className = view.getClass().getName();
if (className.equals("android.view.ViewOverlay$OverlayViewGroup")) {
className = "ViewOverlay";
}
out.write(className);
out.write('@');
out.write(Integer.toHexString(view.hashCode()));
out.write(' ');
if (includeProperties) {
dumpViewProperties(context, view, out);
}
out.newLine();
} catch (IOException e) {
Log.w("View", "Error while dumping hierarchy tree");
return false;
}
return true;
}
private static PropertyInfo[] convertToPropertyInfos(
Method[] methods, Field[] fields, Class property) {
return Stream.of(Arrays.stream(methods).map(m -> PropertyInfo.forMethod(m, property)),
Arrays.stream(fields).map(f -> PropertyInfo.forField(f, property)))
.flatMap(Function.identity())
.filter(i -> i != null)
.toArray(PropertyInfo[]::new);
}
private static PropertyInfo[] getExportedProperties(Class klass) {
if (sExportProperties == null) {
sExportProperties = new HashMap<>();
}
final HashMap, PropertyInfo[]> map = sExportProperties;
PropertyInfo[] properties = sExportProperties.get(klass);
if (properties == null) {
properties = convertToPropertyInfos(klass.getDeclaredMethods(),
klass.getDeclaredFields(), ExportedProperty.class);
map.put(klass, properties);
}
return properties;
}
private static void dumpViewProperties(Context context, Object view,
BufferedWriter out) throws IOException {
dumpViewProperties(context, view, out, "");
}
private static void dumpViewProperties(Context context, Object view,
BufferedWriter out, String prefix) throws IOException {
if (view == null) {
out.write(prefix + "=4,null ");
return;
}
Class klass = view.getClass();
do {
writeExportedProperties(context, view, out, klass, prefix);
klass = klass.getSuperclass();
} while (klass != Object.class);
}
private static String formatIntToHexString(int value) {
return "0x" + Integer.toHexString(value).toUpperCase();
}
private static void writeExportedProperties(Context context, Object view, BufferedWriter out,
Class klass, String prefix) throws IOException {
for (PropertyInfo info : getExportedProperties(klass)) {
//noinspection EmptyCatchBlock
Object value;
try {
value = info.invoke(view);
} catch (Exception e) {
// ignore
continue;
}
String categoryPrefix =
info.property.category().length() != 0 ? info.property.category() + ":" : "";
if (info.returnType == int.class || info.returnType == byte.class) {
if (info.property.resolveId() && context != null) {
final int id = (Integer) value;
value = resolveId(context, id);
} else if (info.property.formatToHexString()) {
if (info.returnType == int.class) {
value = formatIntToHexString((Integer) value);
} else if (info.returnType == byte.class) {
value = "0x"
+ HexEncoding.encodeToString((Byte) value, true);
}
} else {
final ViewDebug.FlagToString[] flagsMapping = info.property.flagMapping();
if (flagsMapping.length > 0) {
final int intValue = (Integer) value;
final String valuePrefix =
categoryPrefix + prefix + info.name + '_';
exportUnrolledFlags(out, flagsMapping, intValue, valuePrefix);
}
final ViewDebug.IntToString[] mapping = info.property.mapping();
if (mapping.length > 0) {
final int intValue = (Integer) value;
boolean mapped = false;
int mappingCount = mapping.length;
for (int j = 0; j < mappingCount; j++) {
final ViewDebug.IntToString mapper = mapping[j];
if (mapper.from() == intValue) {
value = mapper.to();
mapped = true;
break;
}
}
if (!mapped) {
value = intValue;
}
}
}
} else if (info.returnType == int[].class) {
final int[] array = (int[]) value;
final String valuePrefix = categoryPrefix + prefix + info.name + '_';
exportUnrolledArray(context, out, info.property, array, valuePrefix,
info.entrySuffix);
continue;
} else if (info.returnType == String[].class) {
final String[] array = (String[]) value;
if (info.property.hasAdjacentMapping() && array != null) {
for (int j = 0; j < array.length; j += 2) {
if (array[j] != null) {
writeEntry(out, categoryPrefix + prefix, array[j],
info.entrySuffix, array[j + 1] == null ? "null" : array[j + 1]);
}
}
}
continue;
} else if (!info.returnType.isPrimitive()) {
if (info.property.deepExport()) {
dumpViewProperties(context, value, out, prefix + info.property.prefix());
continue;
}
}
writeEntry(out, categoryPrefix + prefix, info.name, info.entrySuffix, value);
}
}
private static void writeEntry(BufferedWriter out, String prefix, String name,
String suffix, Object value) throws IOException {
out.write(prefix);
out.write(name);
out.write(suffix);
out.write("=");
writeValue(out, value);
out.write(' ');
}
private static void exportUnrolledFlags(BufferedWriter out, FlagToString[] mapping,
int intValue, String prefix) throws IOException {
final int count = mapping.length;
for (int j = 0; j < count; j++) {
final FlagToString flagMapping = mapping[j];
final boolean ifTrue = flagMapping.outputIf();
final int maskResult = intValue & flagMapping.mask();
final boolean test = maskResult == flagMapping.equals();
if ((test && ifTrue) || (!test && !ifTrue)) {
final String name = flagMapping.name();
final String value = formatIntToHexString(maskResult);
writeEntry(out, prefix, name, "", value);
}
}
}
/**
* Converts an integer from a field that is mapped with {@link IntToString} to its string
* representation.
*
* @param clazz The class the field is defined on.
* @param field The field on which the {@link ExportedProperty} is defined on.
* @param integer The value to convert.
* @return The value converted into its string representation.
* @hide
*/
public static String intToString(Class clazz, String field, int integer) {
final IntToString[] mapping = getMapping(clazz, field);
if (mapping == null) {
return Integer.toString(integer);
}
final int count = mapping.length;
for (int j = 0; j < count; j++) {
final IntToString map = mapping[j];
if (map.from() == integer) {
return map.to();
}
}
return Integer.toString(integer);
}
/**
* Converts a set of flags from a field that is mapped with {@link FlagToString} to its string
* representation.
*
* @param clazz The class the field is defined on.
* @param field The field on which the {@link ExportedProperty} is defined on.
* @param flags The flags to convert.
* @return The flags converted into their string representations.
* @hide
*/
public static String flagsToString(Class clazz, String field, int flags) {
final FlagToString[] mapping = getFlagMapping(clazz, field);
if (mapping == null) {
return Integer.toHexString(flags);
}
final StringBuilder result = new StringBuilder();
final int count = mapping.length;
for (int j = 0; j < count; j++) {
final FlagToString flagMapping = mapping[j];
final boolean ifTrue = flagMapping.outputIf();
final int maskResult = flags & flagMapping.mask();
final boolean test = maskResult == flagMapping.equals();
if (test && ifTrue) {
final String name = flagMapping.name();
result.append(name).append(' ');
}
}
if (result.length() > 0) {
result.deleteCharAt(result.length() - 1);
}
return result.toString();
}
private static FlagToString[] getFlagMapping(Class clazz, String field) {
try {
return clazz.getDeclaredField(field).getAnnotation(ExportedProperty.class)
.flagMapping();
} catch (NoSuchFieldException e) {
return null;
}
}
private static IntToString[] getMapping(Class clazz, String field) {
try {
return clazz.getDeclaredField(field).getAnnotation(ExportedProperty.class).mapping();
} catch (NoSuchFieldException e) {
return null;
}
}
private static void exportUnrolledArray(Context context, BufferedWriter out,
ExportedProperty property, int[] array, String prefix, String suffix)
throws IOException {
final IntToString[] indexMapping = property.indexMapping();
final boolean hasIndexMapping = indexMapping.length > 0;
final IntToString[] mapping = property.mapping();
final boolean hasMapping = mapping.length > 0;
final boolean resolveId = property.resolveId() && context != null;
final int valuesCount = array.length;
for (int j = 0; j < valuesCount; j++) {
String name;
String value = null;
final int intValue = array[j];
name = String.valueOf(j);
if (hasIndexMapping) {
int mappingCount = indexMapping.length;
for (int k = 0; k < mappingCount; k++) {
final IntToString mapped = indexMapping[k];
if (mapped.from() == j) {
name = mapped.to();
break;
}
}
}
if (hasMapping) {
int mappingCount = mapping.length;
for (int k = 0; k < mappingCount; k++) {
final IntToString mapped = mapping[k];
if (mapped.from() == intValue) {
value = mapped.to();
break;
}
}
}
if (resolveId) {
if (value == null) value = (String) resolveId(context, intValue);
} else {
value = String.valueOf(intValue);
}
writeEntry(out, prefix, name, suffix, value);
}
}
static Object resolveId(Context context, int id) {
Object fieldValue;
final Resources resources = context.getResources();
if (id >= 0) {
try {
fieldValue = resources.getResourceTypeName(id) + '/' +
resources.getResourceEntryName(id);
} catch (Resources.NotFoundException e) {
fieldValue = "id/" + formatIntToHexString(id);
}
} else {
fieldValue = "NO_ID";
}
return fieldValue;
}
private static void writeValue(BufferedWriter out, Object value) throws IOException {
if (value != null) {
String output = "[EXCEPTION]";
try {
output = value.toString().replace("\n", "\\n");
} finally {
out.write(String.valueOf(output.length()));
out.write(",");
out.write(output);
}
} else {
out.write("4,null");
}
}
private static PropertyInfo[] getCapturedViewProperties(
Class klass) {
if (sCapturedViewProperties == null) {
sCapturedViewProperties = new HashMap<>();
}
final HashMap, PropertyInfo[]> map =
sCapturedViewProperties;
PropertyInfo[] infos = map.get(klass);
if (infos == null) {
infos = convertToPropertyInfos(klass.getMethods(), klass.getFields(),
CapturedViewProperty.class);
map.put(klass, infos);
}
return infos;
}
private static String exportCapturedViewProperties(Object obj, Class klass, String prefix) {
if (obj == null) {
return "null";
}
StringBuilder sb = new StringBuilder();
for (PropertyInfo pi : getCapturedViewProperties(klass)) {
try {
Object methodValue = pi.invoke(obj);
if (pi.property.retrieveReturn()) {
//we are interested in the second level data only
sb.append(exportCapturedViewProperties(methodValue, pi.returnType,
pi.name + "#"));
} else {
sb.append(prefix).append(pi.name).append(pi.entrySuffix).append("=");
if (methodValue != null) {
final String value = methodValue.toString().replace("\n", "\\n");
sb.append(value);
} else {
sb.append("null");
}
sb.append(pi.valueSuffix).append(" ");
}
} catch (Exception e) {
//It is OK here, we simply ignore this property
}
}
return sb.toString();
}
/**
* Dump view info for id based instrument test generation
* (and possibly further data analysis). The results are dumped
* to the log.
* @param tag for log
* @param view for dump
*/
public static void dumpCapturedView(String tag, Object view) {
Class klass = view.getClass();
StringBuilder sb = new StringBuilder(klass.getName() + ": ");
sb.append(exportCapturedViewProperties(view, klass, ""));
Log.d(tag, sb.toString());
}
/**
* Invoke a particular method on given view.
* The given method is always invoked on the UI thread. The caller thread will stall until the
* method invocation is complete. Returns an object equal to the result of the method
* invocation, null if the method is declared to return void
* @throws Exception if the method invocation caused any exception
* @hide
*/
public static Object invokeViewMethod(final View view, final Method method,
final Object[] args) {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicReference