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A powerful image downloading and caching library for Android
/*
* Copyright (C) 2013 Square, Inc.
*
* 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 com.squareup.picasso;
import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.content.ContentResolver;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.os.Looper;
import android.os.Process;
import android.os.StatFs;
import android.provider.Settings;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.concurrent.ThreadFactory;
import static android.content.Context.ACTIVITY_SERVICE;
import static android.content.pm.ApplicationInfo.FLAG_LARGE_HEAP;
import static android.os.Build.VERSION.SDK_INT;
import static android.os.Build.VERSION_CODES.HONEYCOMB;
import static android.os.Build.VERSION_CODES.HONEYCOMB_MR1;
import static android.os.Process.THREAD_PRIORITY_BACKGROUND;
import static android.provider.Settings.System.AIRPLANE_MODE_ON;
final class Utils {
static final String THREAD_PREFIX = "Picasso-";
static final String THREAD_IDLE_NAME = THREAD_PREFIX + "Idle";
static final int DEFAULT_READ_TIMEOUT = 20 * 1000; // 20s
static final int DEFAULT_CONNECT_TIMEOUT = 15 * 1000; // 15s
private static final String PICASSO_CACHE = "picasso-cache";
private static final int KEY_PADDING = 50; // Determined by exact science.
private static final int MIN_DISK_CACHE_SIZE = 5 * 1024 * 1024; // 5MB
private static final int MAX_DISK_CACHE_SIZE = 50 * 1024 * 1024; // 50MB
/** Thread confined to main thread for key creation. */
static final StringBuilder MAIN_THREAD_KEY_BUILDER = new StringBuilder();
/* WebP file header
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 'R' | 'I' | 'F' | 'F' |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| File Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 'W' | 'E' | 'B' | 'P' |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
private static final int WEBP_FILE_HEADER_SIZE = 12;
private static final String WEBP_FILE_HEADER_RIFF = "RIFF";
private static final String WEBP_FILE_HEADER_WEBP = "WEBP";
private Utils() {
// No instances.
}
static int getBitmapBytes(Bitmap bitmap) {
int result;
if (SDK_INT >= HONEYCOMB_MR1) {
result = BitmapHoneycombMR1.getByteCount(bitmap);
} else {
result = bitmap.getRowBytes() * bitmap.getHeight();
}
if (result < 0) {
throw new IllegalStateException("Negative size: " + bitmap);
}
return result;
}
static void checkNotMain() {
if (Looper.getMainLooper().getThread() == Thread.currentThread()) {
throw new IllegalStateException("Method call should not happen from the main thread.");
}
}
static String createKey(Request data) {
String result = createKey(data, MAIN_THREAD_KEY_BUILDER);
MAIN_THREAD_KEY_BUILDER.setLength(0);
return result;
}
static String createKey(Request data, StringBuilder builder) {
if (data.uri != null) {
String path = data.uri.toString();
builder.ensureCapacity(path.length() + KEY_PADDING);
builder.append(path);
} else {
builder.ensureCapacity(KEY_PADDING);
builder.append(data.resourceId);
}
builder.append('\n');
if (data.rotationDegrees != 0) {
builder.append("rotation:").append(data.rotationDegrees);
if (data.hasRotationPivot) {
builder.append('@').append(data.rotationPivotX).append('x').append(data.rotationPivotY);
}
builder.append('\n');
}
if (data.targetWidth != 0) {
builder.append("resize:").append(data.targetWidth).append('x').append(data.targetHeight);
builder.append('\n');
}
if (data.centerCrop) {
builder.append("centerCrop\n");
} else if (data.centerInside) {
builder.append("centerInside\n");
}
if (data.transformations != null) {
//noinspection ForLoopReplaceableByForEach
for (int i = 0, count = data.transformations.size(); i < count; i++) {
builder.append(data.transformations.get(i).key());
builder.append('\n');
}
}
return builder.toString();
}
static void closeQuietly(InputStream is) {
if (is == null) return;
try {
is.close();
} catch (IOException ignored) {
}
}
/** Returns {@code true} if header indicates the response body was loaded from the disk cache. */
static boolean parseResponseSourceHeader(String header) {
if (header == null) {
return false;
}
String[] parts = header.split(" ", 2);
if ("CACHE".equals(parts[0])) {
return true;
}
if (parts.length == 1) {
return false;
}
try {
return "CONDITIONAL_CACHE".equals(parts[0]) && Integer.parseInt(parts[1]) == 304;
} catch (NumberFormatException e) {
return false;
}
}
static Downloader createDefaultDownloader(Context context) {
try {
Class.forName("com.squareup.okhttp.OkHttpClient");
return OkHttpLoaderCreator.create(context);
} catch (ClassNotFoundException e) {
return new UrlConnectionDownloader(context);
}
}
static File createDefaultCacheDir(Context context) {
File cache = new File(context.getApplicationContext().getCacheDir(), PICASSO_CACHE);
if (!cache.exists()) {
cache.mkdirs();
}
return cache;
}
static long calculateDiskCacheSize(File dir) {
long size = MIN_DISK_CACHE_SIZE;
try {
StatFs statFs = new StatFs(dir.getAbsolutePath());
long available = ((long) statFs.getBlockCount()) * statFs.getBlockSize();
// Target 2% of the total space.
size = available / 50;
} catch (IllegalArgumentException ignored) {
}
// Bound inside min/max size for disk cache.
return Math.max(Math.min(size, MAX_DISK_CACHE_SIZE), MIN_DISK_CACHE_SIZE);
}
static int calculateMemoryCacheSize(Context context) {
ActivityManager am = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE);
boolean largeHeap = (context.getApplicationInfo().flags & FLAG_LARGE_HEAP) != 0;
int memoryClass = am.getMemoryClass();
if (largeHeap && SDK_INT >= HONEYCOMB) {
memoryClass = ActivityManagerHoneycomb.getLargeMemoryClass(am);
}
// Target ~15% of the available heap.
return 1024 * 1024 * memoryClass / 7;
}
static boolean isAirplaneModeOn(Context context) {
ContentResolver contentResolver = context.getContentResolver();
return Settings.System.getInt(contentResolver, AIRPLANE_MODE_ON, 0) != 0;
}
static boolean hasPermission(Context context, String permission) {
return context.checkCallingOrSelfPermission(permission) == PackageManager.PERMISSION_GRANTED;
}
static byte[] toByteArray(InputStream input) throws IOException {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024 * 4];
int n;
while (-1 != (n = input.read(buffer))) {
byteArrayOutputStream.write(buffer, 0, n);
}
return byteArrayOutputStream.toByteArray();
}
static boolean isWebPFile(InputStream stream) throws IOException {
byte[] fileHeaderBytes = new byte[WEBP_FILE_HEADER_SIZE];
boolean isWebPFile = false;
if (stream.read(fileHeaderBytes, 0, WEBP_FILE_HEADER_SIZE) == WEBP_FILE_HEADER_SIZE) {
// If a file's header starts with RIFF and end with WEBP, the file is a WebP file
isWebPFile = WEBP_FILE_HEADER_RIFF.equals(new String(fileHeaderBytes, 0, 4, "US-ASCII"))
&& WEBP_FILE_HEADER_WEBP.equals(new String(fileHeaderBytes, 8, 4, "US-ASCII"));
}
return isWebPFile;
}
static int getResourceId(Resources resources, Request data) throws FileNotFoundException {
if (data.resourceId != 0 || data.uri == null) {
return data.resourceId;
}
String pkg = data.uri.getAuthority();
if (pkg == null) throw new FileNotFoundException("No package provided: " + data.uri);
int id;
List segments = data.uri.getPathSegments();
if (segments == null || segments.isEmpty()) {
throw new FileNotFoundException("No path segments: " + data.uri);
} else if (segments.size() == 1) {
try {
id = Integer.parseInt(segments.get(0));
} catch (NumberFormatException e) {
throw new FileNotFoundException("Last path segment is not a resource ID: " + data.uri);
}
} else if (segments.size() == 2) {
String type = segments.get(0);
String name = segments.get(1);
id = resources.getIdentifier(name, type, pkg);
} else {
throw new FileNotFoundException("More than two path segments: " + data.uri);
}
return id;
}
static Resources getResources(Context context, Request data) throws FileNotFoundException {
if (data.resourceId != 0 || data.uri == null) {
return context.getResources();
}
String pkg = data.uri.getAuthority();
if (pkg == null) throw new FileNotFoundException("No package provided: " + data.uri);
try {
PackageManager pm = context.getPackageManager();
return pm.getResourcesForApplication(pkg);
} catch (PackageManager.NameNotFoundException e) {
throw new FileNotFoundException("Unable to obtain resources for package: " + data.uri);
}
}
@TargetApi(HONEYCOMB)
private static class ActivityManagerHoneycomb {
static int getLargeMemoryClass(ActivityManager activityManager) {
return activityManager.getLargeMemoryClass();
}
}
static class PicassoThreadFactory implements ThreadFactory {
@SuppressWarnings("NullableProblems")
public Thread newThread(Runnable r) {
return new PicassoThread(r);
}
}
private static class PicassoThread extends Thread {
public PicassoThread(Runnable r) {
super(r);
}
@Override public void run() {
Process.setThreadPriority(THREAD_PRIORITY_BACKGROUND);
super.run();
}
}
@TargetApi(HONEYCOMB_MR1)
private static class BitmapHoneycombMR1 {
static int getByteCount(Bitmap bitmap) {
return bitmap.getByteCount();
}
}
private static class OkHttpLoaderCreator {
static Downloader create(Context context) {
return new OkHttpDownloader(context);
}
}
}
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