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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2016 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 com.android.systemui.fragments;
import android.annotation.Nullable;
import android.app.Fragment;
import android.app.FragmentController;
import android.app.FragmentHostCallback;
import android.app.FragmentManager;
import android.app.FragmentManager.FragmentLifecycleCallbacks;
import android.app.FragmentManagerNonConfig;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Parcelable;
import android.util.ArrayMap;
import android.view.LayoutInflater;
import android.view.View;
import androidx.annotation.NonNull;
import com.android.settingslib.applications.InterestingConfigChanges;
import com.android.systemui.Dependency;
import com.android.systemui.plugins.Plugin;
import com.android.systemui.util.leak.LeakDetector;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
public class FragmentHostManager {
private final Handler mHandler = new Handler(Looper.getMainLooper());
private final Context mContext;
private final HashMap> mListeners = new HashMap<>();
private final View mRootView;
private final InterestingConfigChanges mConfigChanges = new InterestingConfigChanges(
ActivityInfo.CONFIG_FONT_SCALE | ActivityInfo.CONFIG_LOCALE
| ActivityInfo.CONFIG_SCREEN_LAYOUT | ActivityInfo.CONFIG_ASSETS_PATHS
| ActivityInfo.CONFIG_UI_MODE);
private final FragmentService mManager;
private final ExtensionFragmentManager mPlugins = new ExtensionFragmentManager();
private FragmentController mFragments;
private FragmentLifecycleCallbacks mLifecycleCallbacks;
FragmentHostManager(FragmentService manager, View rootView) {
mContext = rootView.getContext();
mManager = manager;
mRootView = rootView;
mConfigChanges.applyNewConfig(mContext.getResources());
createFragmentHost(null);
}
private void createFragmentHost(Parcelable savedState) {
mFragments = FragmentController.createController(new HostCallbacks());
mFragments.attachHost(null);
mLifecycleCallbacks = new FragmentLifecycleCallbacks() {
@Override
public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v,
Bundle savedInstanceState) {
FragmentHostManager.this.onFragmentViewCreated(f);
}
@Override
public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) {
FragmentHostManager.this.onFragmentViewDestroyed(f);
}
@Override
public void onFragmentDestroyed(FragmentManager fm, Fragment f) {
Dependency.get(LeakDetector.class).trackGarbage(f);
}
};
mFragments.getFragmentManager().registerFragmentLifecycleCallbacks(mLifecycleCallbacks,
true);
if (savedState != null) {
mFragments.restoreAllState(savedState, (FragmentManagerNonConfig) null);
}
// For now just keep all fragments in the resumed state.
mFragments.dispatchCreate();
mFragments.dispatchStart();
mFragments.dispatchResume();
}
private Parcelable destroyFragmentHost() {
mFragments.dispatchPause();
Parcelable p = mFragments.saveAllState();
mFragments.dispatchStop();
mFragments.dispatchDestroy();
mFragments.getFragmentManager().unregisterFragmentLifecycleCallbacks(mLifecycleCallbacks);
return p;
}
public FragmentHostManager addTagListener(String tag, FragmentListener listener) {
ArrayList listeners = mListeners.get(tag);
if (listeners == null) {
listeners = new ArrayList<>();
mListeners.put(tag, listeners);
}
listeners.add(listener);
Fragment current = getFragmentManager().findFragmentByTag(tag);
if (current != null && current.getView() != null) {
listener.onFragmentViewCreated(tag, current);
}
return this;
}
// Shouldn't generally be needed, included for completeness sake.
public void removeTagListener(String tag, FragmentListener listener) {
ArrayList listeners = mListeners.get(tag);
if (listeners != null && listeners.remove(listener) && listeners.size() == 0) {
mListeners.remove(tag);
}
}
private void onFragmentViewCreated(Fragment fragment) {
String tag = fragment.getTag();
ArrayList listeners = mListeners.get(tag);
if (listeners != null) {
listeners.forEach((listener) -> listener.onFragmentViewCreated(tag, fragment));
}
}
private void onFragmentViewDestroyed(Fragment fragment) {
String tag = fragment.getTag();
ArrayList listeners = mListeners.get(tag);
if (listeners != null) {
listeners.forEach((listener) -> listener.onFragmentViewDestroyed(tag, fragment));
}
}
/**
* Called when the configuration changed, return true if the fragments
* should be recreated.
*/
protected void onConfigurationChanged(Configuration newConfig) {
if (mConfigChanges.applyNewConfig(mContext.getResources())) {
reloadFragments();
} else {
mFragments.dispatchConfigurationChanged(newConfig);
}
}
private void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
// TODO: Do something?
}
private T findViewById(int id) {
return mRootView.findViewById(id);
}
/**
* Note: Values from this shouldn't be cached as they can change after config changes.
*/
public FragmentManager getFragmentManager() {
return mFragments.getFragmentManager();
}
ExtensionFragmentManager getExtensionManager() {
return mPlugins;
}
void destroy() {
mFragments.dispatchDestroy();
}
/**
* Creates a fragment that requires injection.
*/
public T create(Class fragmentCls) {
return (T) mPlugins.instantiate(mContext, fragmentCls.getName(), null);
}
public interface FragmentListener {
void onFragmentViewCreated(String tag, Fragment fragment);
// The facts of lifecycle
// When a fragment is destroyed, you should not talk to it any longer.
default void onFragmentViewDestroyed(String tag, Fragment fragment) {
}
}
public static FragmentHostManager get(View view) {
try {
return Dependency.get(FragmentService.class).getFragmentHostManager(view);
} catch (ClassCastException e) {
// TODO: Some auto handling here?
throw e;
}
}
public static void removeAndDestroy(View view) {
Dependency.get(FragmentService.class).removeAndDestroy(view);
}
public void reloadFragments() {
// Save the old state.
Parcelable p = destroyFragmentHost();
// Generate a new fragment host and restore its state.
createFragmentHost(p);
}
class HostCallbacks extends FragmentHostCallback {
public HostCallbacks() {
super(mContext, FragmentHostManager.this.mHandler, 0);
}
@Override
public FragmentHostManager onGetHost() {
return FragmentHostManager.this;
}
@Override
public void onDump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
FragmentHostManager.this.dump(prefix, fd, writer, args);
}
@Override
public Fragment instantiate(Context context, String className, Bundle arguments) {
return mPlugins.instantiate(context, className, arguments);
}
@Override
public boolean onShouldSaveFragmentState(Fragment fragment) {
return true; // True for now.
}
@Override
public LayoutInflater onGetLayoutInflater() {
return LayoutInflater.from(mContext);
}
@Override
public boolean onUseFragmentManagerInflaterFactory() {
return true;
}
@Override
public boolean onHasWindowAnimations() {
return false;
}
@Override
public int onGetWindowAnimations() {
return 0;
}
@Override
public void onAttachFragment(Fragment fragment) {
}
@Override
@Nullable
public T onFindViewById(int id) {
return FragmentHostManager.this.findViewById(id);
}
@Override
public boolean onHasView() {
return true;
}
}
class ExtensionFragmentManager {
private final ArrayMap mExtensionLookup = new ArrayMap<>();
public void setCurrentExtension(int id, @NonNull String tag, @Nullable String oldClass,
@NonNull String currentClass, @Nullable Context context) {
if (oldClass != null) {
mExtensionLookup.remove(oldClass);
}
mExtensionLookup.put(currentClass, context);
getFragmentManager().beginTransaction()
.replace(id, instantiate(context, currentClass, null), tag)
.commit();
reloadFragments();
}
Fragment instantiate(Context context, String className, Bundle arguments) {
Context extensionContext = mExtensionLookup.get(className);
if (extensionContext != null) {
Fragment f = instantiateWithInjections(extensionContext, className, arguments);
if (f instanceof Plugin) {
((Plugin) f).onCreate(mContext, extensionContext);
}
return f;
}
return instantiateWithInjections(context, className, arguments);
}
private Fragment instantiateWithInjections(Context context, String className,
Bundle args) {
Method method = mManager.getInjectionMap().get(className);
if (method != null) {
try {
Fragment f = (Fragment) method.invoke(mManager.getFragmentCreator());
// Setup the args, taken from Fragment#instantiate.
if (args != null) {
args.setClassLoader(f.getClass().getClassLoader());
f.setArguments(args);
}
return f;
} catch (IllegalAccessException e) {
throw new Fragment.InstantiationException("Unable to instantiate " + className,
e);
} catch (InvocationTargetException e) {
throw new Fragment.InstantiationException("Unable to instantiate " + className,
e);
}
}
return Fragment.instantiate(context, className, args);
}
}
private static class PluginState {
Context mContext;
String mCls;
private PluginState(String cls, Context context) {
mCls = cls;
mContext = context;
}
}
}
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