/
FlutterView.java
851 lines (745 loc) · 32.6 KB
/
FlutterView.java
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package io.flutter.view;
import android.annotation.TargetApi;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Insets;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.SurfaceTexture;
import android.os.Build;
import android.os.Handler;
import android.os.LocaleList;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.annotation.UiThread;
import android.text.format.DateFormat;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowInsets;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityNodeProvider;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicLong;
import io.flutter.app.FlutterPluginRegistry;
import io.flutter.embedding.android.AndroidKeyProcessor;
import io.flutter.embedding.android.AndroidTouchProcessor;
import io.flutter.embedding.engine.FlutterJNI;
import io.flutter.embedding.engine.dart.DartExecutor;
import io.flutter.embedding.engine.renderer.FlutterRenderer;
import io.flutter.embedding.engine.systemchannels.AccessibilityChannel;
import io.flutter.embedding.engine.systemchannels.KeyEventChannel;
import io.flutter.embedding.engine.systemchannels.LifecycleChannel;
import io.flutter.embedding.engine.systemchannels.LocalizationChannel;
import io.flutter.embedding.engine.systemchannels.NavigationChannel;
import io.flutter.embedding.engine.systemchannels.PlatformChannel;
import io.flutter.embedding.engine.systemchannels.SettingsChannel;
import io.flutter.embedding.engine.systemchannels.SystemChannel;
import io.flutter.plugin.common.ActivityLifecycleListener;
import io.flutter.plugin.common.BinaryMessenger;
import io.flutter.plugin.editing.TextInputPlugin;
import io.flutter.plugin.platform.PlatformPlugin;
import io.flutter.plugin.platform.PlatformViewsController;
/**
* An Android view containing a Flutter app.
*/
public class FlutterView extends SurfaceView implements BinaryMessenger, TextureRegistry {
/**
* Interface for those objects that maintain and expose a reference to a
* {@code FlutterView} (such as a full-screen Flutter activity).
*
* <p>
* This indirection is provided to support applications that use an activity
* other than {@link io.flutter.app.FlutterActivity} (e.g. Android v4 support
* library's {@code FragmentActivity}). It allows Flutter plugins to deal in
* this interface and not require that the activity be a subclass of
* {@code FlutterActivity}.
* </p>
*/
public interface Provider {
/**
* Returns a reference to the Flutter view maintained by this object. This may
* be {@code null}.
*/
FlutterView getFlutterView();
}
private static final String TAG = "FlutterView";
static final class ViewportMetrics {
float devicePixelRatio = 1.0f;
int physicalWidth = 0;
int physicalHeight = 0;
int physicalPaddingTop = 0;
int physicalPaddingRight = 0;
int physicalPaddingBottom = 0;
int physicalPaddingLeft = 0;
int physicalViewInsetTop = 0;
int physicalViewInsetRight = 0;
int physicalViewInsetBottom = 0;
int physicalViewInsetLeft = 0;
int systemGestureInsetTop = 0;
int systemGestureInsetRight = 0;
int systemGestureInsetBottom = 0;
int systemGestureInsetLeft = 0;
}
private final DartExecutor dartExecutor;
private final FlutterRenderer flutterRenderer;
private final NavigationChannel navigationChannel;
private final KeyEventChannel keyEventChannel;
private final LifecycleChannel lifecycleChannel;
private final LocalizationChannel localizationChannel;
private final PlatformChannel platformChannel;
private final SettingsChannel settingsChannel;
private final SystemChannel systemChannel;
private final InputMethodManager mImm;
private final TextInputPlugin mTextInputPlugin;
private final AndroidKeyProcessor androidKeyProcessor;
private final AndroidTouchProcessor androidTouchProcessor;
private AccessibilityBridge mAccessibilityNodeProvider;
private final SurfaceHolder.Callback mSurfaceCallback;
private final ViewportMetrics mMetrics;
private final List<ActivityLifecycleListener> mActivityLifecycleListeners;
private final List<FirstFrameListener> mFirstFrameListeners;
private final AtomicLong nextTextureId = new AtomicLong(0L);
private FlutterNativeView mNativeView;
private boolean mIsSoftwareRenderingEnabled = false; // using the software renderer or not
private boolean didRenderFirstFrame = false;
private final AccessibilityBridge.OnAccessibilityChangeListener onAccessibilityChangeListener = new AccessibilityBridge.OnAccessibilityChangeListener() {
@Override
public void onAccessibilityChanged(boolean isAccessibilityEnabled, boolean isTouchExplorationEnabled) {
resetWillNotDraw(isAccessibilityEnabled, isTouchExplorationEnabled);
}
};
public FlutterView(Context context) {
this(context, null);
}
public FlutterView(Context context, AttributeSet attrs) {
this(context, attrs, null);
}
public FlutterView(Context context, AttributeSet attrs, FlutterNativeView nativeView) {
super(context, attrs);
Activity activity = getActivity(getContext());
if (activity == null) {
throw new IllegalArgumentException("Bad context");
}
if (nativeView == null) {
mNativeView = new FlutterNativeView(activity.getApplicationContext());
} else {
mNativeView = nativeView;
}
dartExecutor = mNativeView.getDartExecutor();
flutterRenderer = new FlutterRenderer(mNativeView.getFlutterJNI());
mIsSoftwareRenderingEnabled = mNativeView.getFlutterJNI().nativeGetIsSoftwareRenderingEnabled();
mMetrics = new ViewportMetrics();
mMetrics.devicePixelRatio = context.getResources().getDisplayMetrics().density;
setFocusable(true);
setFocusableInTouchMode(true);
mNativeView.attachViewAndActivity(this, activity);
mSurfaceCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
assertAttached();
mNativeView.getFlutterJNI().onSurfaceCreated(holder.getSurface());
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
assertAttached();
mNativeView.getFlutterJNI().onSurfaceChanged(width, height);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
assertAttached();
mNativeView.getFlutterJNI().onSurfaceDestroyed();
}
};
getHolder().addCallback(mSurfaceCallback);
mActivityLifecycleListeners = new ArrayList<>();
mFirstFrameListeners = new ArrayList<>();
// Create all platform channels
navigationChannel = new NavigationChannel(dartExecutor);
keyEventChannel = new KeyEventChannel(dartExecutor);
lifecycleChannel = new LifecycleChannel(dartExecutor);
localizationChannel = new LocalizationChannel(dartExecutor);
platformChannel = new PlatformChannel(dartExecutor);
systemChannel = new SystemChannel(dartExecutor);
settingsChannel = new SettingsChannel(dartExecutor);
// Create and setup plugins
PlatformPlugin platformPlugin = new PlatformPlugin(activity, platformChannel);
addActivityLifecycleListener(new ActivityLifecycleListener() {
@Override
public void onPostResume() {
platformPlugin.updateSystemUiOverlays();
}
});
mImm = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
PlatformViewsController platformViewsController = mNativeView.getPluginRegistry().getPlatformViewsController();
mTextInputPlugin = new TextInputPlugin(this, dartExecutor, platformViewsController);
androidKeyProcessor = new AndroidKeyProcessor(keyEventChannel, mTextInputPlugin);
androidTouchProcessor = new AndroidTouchProcessor(flutterRenderer);
mNativeView.getPluginRegistry().getPlatformViewsController().attachTextInputPlugin(mTextInputPlugin);
// Send initial platform information to Dart
sendLocalesToDart(getResources().getConfiguration());
sendUserPlatformSettingsToDart();
}
private static Activity getActivity(Context context) {
if (context == null) {
return null;
}
if (context instanceof Activity) {
return (Activity) context;
}
if (context instanceof ContextWrapper) {
// Recurse up chain of base contexts until we find an Activity.
return getActivity(((ContextWrapper) context).getBaseContext());
}
return null;
}
@NonNull
public DartExecutor getDartExecutor() {
return dartExecutor;
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (!isAttached()) {
return super.onKeyUp(keyCode, event);
}
androidKeyProcessor.onKeyUp(event);
return super.onKeyUp(keyCode, event);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (!isAttached()) {
return super.onKeyDown(keyCode, event);
}
androidKeyProcessor.onKeyDown(event);
return super.onKeyDown(keyCode, event);
}
public FlutterNativeView getFlutterNativeView() {
return mNativeView;
}
public FlutterPluginRegistry getPluginRegistry() {
return mNativeView.getPluginRegistry();
}
public String getLookupKeyForAsset(String asset) {
return FlutterMain.getLookupKeyForAsset(asset);
}
public String getLookupKeyForAsset(String asset, String packageName) {
return FlutterMain.getLookupKeyForAsset(asset, packageName);
}
public void addActivityLifecycleListener(ActivityLifecycleListener listener) {
mActivityLifecycleListeners.add(listener);
}
public void onStart() {
lifecycleChannel.appIsInactive();
}
public void onPause() {
lifecycleChannel.appIsInactive();
}
public void onPostResume() {
for (ActivityLifecycleListener listener : mActivityLifecycleListeners) {
listener.onPostResume();
}
lifecycleChannel.appIsResumed();
}
public void onStop() {
lifecycleChannel.appIsPaused();
}
public void onMemoryPressure() {
systemChannel.sendMemoryPressureWarning();
}
/**
* Returns true if the Flutter experience associated with this {@code FlutterView} has
* rendered its first frame, or false otherwise.
*/
public boolean hasRenderedFirstFrame() {
return didRenderFirstFrame;
}
/**
* Provide a listener that will be called once when the FlutterView renders its
* first frame to the underlaying SurfaceView.
*/
public void addFirstFrameListener(FirstFrameListener listener) {
mFirstFrameListeners.add(listener);
}
/**
* Remove an existing first frame listener.
*/
public void removeFirstFrameListener(FirstFrameListener listener) {
mFirstFrameListeners.remove(listener);
}
/**
* Updates this to support rendering as a transparent {@link SurfaceView}.
*
* Sets it on top of its window. The background color still needs to be
* controlled from within the Flutter UI itself.
*
* @deprecated FlutterView in the v1 embedding is always a SurfaceView and will
* cover accessibility highlights when transparent. Consider
* migrating to the v2 Android embedding, using
* {@link io.flutter.embedding.android.FlutterView.RenderMode#texture},
* and setting
* {@link io.flutter.embedding.android.FlutterView.TransparencyMode#transparent}.
* See also
* https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects.
*/
@Deprecated
public void enableTransparentBackground() {
Log.w(TAG, "FlutterView in the v1 embedding is always a SurfaceView and will cover accessibility highlights when transparent. Consider migrating to the v2 Android embedding. https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects");
setZOrderOnTop(true);
getHolder().setFormat(PixelFormat.TRANSPARENT);
}
/**
* Reverts this back to the {@link SurfaceView} defaults, at the back of its
* window and opaque.
*/
public void disableTransparentBackground() {
setZOrderOnTop(false);
getHolder().setFormat(PixelFormat.OPAQUE);
}
public void setInitialRoute(String route) {
navigationChannel.setInitialRoute(route);
}
public void pushRoute(String route) {
navigationChannel.pushRoute(route);
}
public void popRoute() {
navigationChannel.popRoute();
}
private void sendUserPlatformSettingsToDart() {
// Lookup the current brightness of the Android OS.
boolean isNightModeOn = (getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES;
SettingsChannel.PlatformBrightness brightness = isNightModeOn
? SettingsChannel.PlatformBrightness.dark
: SettingsChannel.PlatformBrightness.light;
settingsChannel
.startMessage()
.setTextScaleFactor(getResources().getConfiguration().fontScale)
.setUse24HourFormat(DateFormat.is24HourFormat(getContext()))
.setPlatformBrightness(brightness)
.send();
}
@SuppressWarnings("deprecation")
private void sendLocalesToDart(Configuration config) {
List<Locale> locales = new ArrayList<>();
if (Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
LocaleList localeList = config.getLocales();
int localeCount = localeList.size();
for (int index = 0; index < localeCount; ++index) {
Locale locale = localeList.get(index);
locales.add(locale);
}
} else {
locales.add(config.locale);
}
localizationChannel.sendLocales(locales);
}
@Override
protected void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
sendLocalesToDart(newConfig);
sendUserPlatformSettingsToDart();
}
float getDevicePixelRatio() {
return mMetrics.devicePixelRatio;
}
public FlutterNativeView detach() {
if (!isAttached())
return null;
getHolder().removeCallback(mSurfaceCallback);
mNativeView.detachFromFlutterView();
FlutterNativeView view = mNativeView;
mNativeView = null;
return view;
}
public void destroy() {
if (!isAttached())
return;
getHolder().removeCallback(mSurfaceCallback);
mNativeView.destroy();
mNativeView = null;
}
@Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
return mTextInputPlugin.createInputConnection(this, outAttrs);
}
@Override
public boolean checkInputConnectionProxy(View view) {
return mNativeView.getPluginRegistry().getPlatformViewsController().checkInputConnectionProxy(view);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isAttached()) {
return super.onTouchEvent(event);
}
// TODO(abarth): This version check might not be effective in some
// versions of Android that statically compile code and will be upset
// at the lack of |requestUnbufferedDispatch|. Instead, we should factor
// version-dependent code into separate classes for each supported
// version and dispatch dynamically.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
requestUnbufferedDispatch(event);
}
return androidTouchProcessor.onTouchEvent(event);
}
@Override
public boolean onHoverEvent(MotionEvent event) {
if (!isAttached()) {
return super.onHoverEvent(event);
}
boolean handled = mAccessibilityNodeProvider.onAccessibilityHoverEvent(event);
if (!handled) {
// TODO(ianh): Expose hover events to the platform,
// implementing ADD, REMOVE, etc.
}
return handled;
}
/**
* Invoked by Android when a generic motion event occurs, e.g., joystick movement, mouse hover,
* track pad touches, scroll wheel movements, etc.
*
* Flutter handles all of its own gesture detection and processing, therefore this
* method forwards all {@link MotionEvent} data from Android to Flutter.
*/
@Override
public boolean onGenericMotionEvent(MotionEvent event) {
boolean handled = isAttached() && androidTouchProcessor.onGenericMotionEvent(event);
return handled ? true : super.onGenericMotionEvent(event);
}
@Override
protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {
mMetrics.physicalWidth = width;
mMetrics.physicalHeight = height;
updateViewportMetrics();
super.onSizeChanged(width, height, oldWidth, oldHeight);
}
// TODO(garyq): Add support for notch cutout API
// Decide if we want to zero the padding of the sides. When in Landscape orientation,
// android may decide to place the software navigation bars on the side. When the nav
// bar is hidden, the reported insets should be removed to prevent extra useless space
// on the sides.
enum ZeroSides { NONE, LEFT, RIGHT, BOTH }
ZeroSides calculateShouldZeroSides() {
// We get both orientation and rotation because rotation is all 4
// rotations relative to default rotation while orientation is portrait
// or landscape. By combining both, we can obtain a more precise measure
// of the rotation.
Activity activity = (Activity)getContext();
int orientation = activity.getResources().getConfiguration().orientation;
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
if (rotation == Surface.ROTATION_90) {
return ZeroSides.RIGHT;
}
else if (rotation == Surface.ROTATION_270) {
// In android API >= 23, the nav bar always appears on the "bottom" (USB) side.
return Build.VERSION.SDK_INT >= 23 ? ZeroSides.LEFT : ZeroSides.RIGHT;
}
// Ambiguous orientation due to landscape left/right default. Zero both sides.
else if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180) {
return ZeroSides.BOTH;
}
}
// Square orientation deprecated in API 16, we will not check for it and return false
// to be safe and not remove any unique padding for the devices that do use it.
return ZeroSides.NONE;
}
// TODO(garyq): Use clean ways to detect keyboard instead of heuristics if possible
// TODO(garyq): The keyboard detection may interact strangely with
// https://github.com/flutter/flutter/issues/22061
// Uses inset heights and screen heights as a heuristic to determine if the insets should
// be padded. When the on-screen keyboard is detected, we want to include the full inset
// but when the inset is just the hidden nav bar, we want to provide a zero inset so the space
// can be used.
@TargetApi(20)
@RequiresApi(20)
int calculateBottomKeyboardInset(WindowInsets insets) {
int screenHeight = getRootView().getHeight();
// Magic number due to this being a heuristic. This should be replaced, but we have not
// found a clean way to do it yet (Sept. 2018)
final double keyboardHeightRatioHeuristic = 0.18;
if (insets.getSystemWindowInsetBottom() < screenHeight * keyboardHeightRatioHeuristic) {
// Is not a keyboard, so return zero as inset.
return 0;
}
else {
// Is a keyboard, so return the full inset.
return insets.getSystemWindowInsetBottom();
}
}
// This callback is not present in API < 20, which means lower API devices will see
// the wider than expected padding when the status and navigation bars are hidden.
// The annotations to suppress "InlinedApi" and "NewApi" lints prevent lint warnings
// caused by usage of Android Q APIs. These calls are safe because they are
// guarded.
@Override
@TargetApi(20)
@RequiresApi(20)
@SuppressLint({"InlinedApi", "NewApi"})
public final WindowInsets onApplyWindowInsets(WindowInsets insets) {
boolean statusBarHidden =
(SYSTEM_UI_FLAG_FULLSCREEN & getWindowSystemUiVisibility()) != 0;
boolean navigationBarHidden =
(SYSTEM_UI_FLAG_HIDE_NAVIGATION & getWindowSystemUiVisibility()) != 0;
// We zero the left and/or right sides to prevent the padding the
// navigation bar would have caused.
ZeroSides zeroSides = ZeroSides.NONE;
if (navigationBarHidden) {
zeroSides = calculateShouldZeroSides();
}
// The padding on top should be removed when the statusbar is hidden.
mMetrics.physicalPaddingTop = statusBarHidden ? 0 : insets.getSystemWindowInsetTop();
mMetrics.physicalPaddingRight =
zeroSides == ZeroSides.RIGHT || zeroSides == ZeroSides.BOTH ? 0 : insets.getSystemWindowInsetRight();
mMetrics.physicalPaddingBottom = 0;
mMetrics.physicalPaddingLeft =
zeroSides == ZeroSides.LEFT || zeroSides == ZeroSides.BOTH ? 0 : insets.getSystemWindowInsetLeft();
// Bottom system inset (keyboard) should adjust scrollable bottom edge (inset).
mMetrics.physicalViewInsetTop = 0;
mMetrics.physicalViewInsetRight = 0;
// We perform hidden navbar and keyboard handling if the navbar is set to hidden. Otherwise,
// the navbar padding should always be provided.
mMetrics.physicalViewInsetBottom =
navigationBarHidden ? calculateBottomKeyboardInset(insets) : insets.getSystemWindowInsetBottom();
mMetrics.physicalViewInsetLeft = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
Insets systemGestureInsets = insets.getSystemGestureInsets();
mMetrics.systemGestureInsetTop = systemGestureInsets.top;
mMetrics.systemGestureInsetRight = systemGestureInsets.right;
mMetrics.systemGestureInsetBottom = systemGestureInsets.bottom;
mMetrics.systemGestureInsetLeft = systemGestureInsets.left;
}
updateViewportMetrics();
return super.onApplyWindowInsets(insets);
}
@Override
@SuppressWarnings("deprecation")
protected boolean fitSystemWindows(Rect insets) {
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
// Status bar, left/right system insets partially obscure content (padding).
mMetrics.physicalPaddingTop = insets.top;
mMetrics.physicalPaddingRight = insets.right;
mMetrics.physicalPaddingBottom = 0;
mMetrics.physicalPaddingLeft = insets.left;
// Bottom system inset (keyboard) should adjust scrollable bottom edge (inset).
mMetrics.physicalViewInsetTop = 0;
mMetrics.physicalViewInsetRight = 0;
mMetrics.physicalViewInsetBottom = insets.bottom;
mMetrics.physicalViewInsetLeft = 0;
updateViewportMetrics();
return true;
} else {
return super.fitSystemWindows(insets);
}
}
private boolean isAttached() {
return mNativeView != null && mNativeView.isAttached();
}
void assertAttached() {
if (!isAttached())
throw new AssertionError("Platform view is not attached");
}
private void preRun() {
resetAccessibilityTree();
}
void resetAccessibilityTree() {
if (mAccessibilityNodeProvider != null) {
mAccessibilityNodeProvider.reset();
}
}
private void postRun() {
}
public void runFromBundle(FlutterRunArguments args) {
assertAttached();
preRun();
mNativeView.runFromBundle(args);
postRun();
}
/**
* Return the most recent frame as a bitmap.
*
* @return A bitmap.
*/
public Bitmap getBitmap() {
assertAttached();
return mNativeView.getFlutterJNI().getBitmap();
}
private void updateViewportMetrics() {
if (!isAttached())
return;
mNativeView.getFlutterJNI().setViewportMetrics(
mMetrics.devicePixelRatio,
mMetrics.physicalWidth,
mMetrics.physicalHeight,
mMetrics.physicalPaddingTop,
mMetrics.physicalPaddingRight,
mMetrics.physicalPaddingBottom,
mMetrics.physicalPaddingLeft,
mMetrics.physicalViewInsetTop,
mMetrics.physicalViewInsetRight,
mMetrics.physicalViewInsetBottom,
mMetrics.physicalViewInsetLeft,
mMetrics.systemGestureInsetTop,
mMetrics.systemGestureInsetRight,
mMetrics.systemGestureInsetBottom,
mMetrics.systemGestureInsetLeft
);
}
// Called by FlutterNativeView to notify first Flutter frame rendered.
public void onFirstFrame() {
didRenderFirstFrame = true;
// Allow listeners to remove themselves when they are called.
List<FirstFrameListener> listeners = new ArrayList<>(mFirstFrameListeners);
for (FirstFrameListener listener : listeners) {
listener.onFirstFrame();
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
PlatformViewsController platformViewsController = getPluginRegistry().getPlatformViewsController();
mAccessibilityNodeProvider = new AccessibilityBridge(
this,
new AccessibilityChannel(dartExecutor, getFlutterNativeView().getFlutterJNI()),
(AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE),
getContext().getContentResolver(),
platformViewsController
);
mAccessibilityNodeProvider.setOnAccessibilityChangeListener(onAccessibilityChangeListener);
resetWillNotDraw(
mAccessibilityNodeProvider.isAccessibilityEnabled(),
mAccessibilityNodeProvider.isTouchExplorationEnabled()
);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mAccessibilityNodeProvider.release();
mAccessibilityNodeProvider = null;
}
// TODO(mattcarroll): Confer with Ian as to why we need this method. Delete if possible, otherwise add comments.
private void resetWillNotDraw(boolean isAccessibilityEnabled, boolean isTouchExplorationEnabled) {
if (!mIsSoftwareRenderingEnabled) {
setWillNotDraw(!(isAccessibilityEnabled || isTouchExplorationEnabled));
} else {
setWillNotDraw(false);
}
}
@Override
public AccessibilityNodeProvider getAccessibilityNodeProvider() {
if (mAccessibilityNodeProvider != null && mAccessibilityNodeProvider.isAccessibilityEnabled()) {
return mAccessibilityNodeProvider;
} else {
// TODO(goderbauer): when a11y is off this should return a one-off snapshot of
// the a11y
// tree.
return null;
}
}
@Override
@UiThread
public void send(String channel, ByteBuffer message) {
send(channel, message, null);
}
@Override
@UiThread
public void send(String channel, ByteBuffer message, BinaryReply callback) {
if (!isAttached()) {
Log.d(TAG, "FlutterView.send called on a detached view, channel=" + channel);
return;
}
mNativeView.send(channel, message, callback);
}
@Override
@UiThread
public void setMessageHandler(String channel, BinaryMessageHandler handler) {
mNativeView.setMessageHandler(channel, handler);
}
/**
* Listener will be called on the Android UI thread once when Flutter renders
* the first frame.
*/
public interface FirstFrameListener {
void onFirstFrame();
}
@Override
public TextureRegistry.SurfaceTextureEntry createSurfaceTexture() {
final SurfaceTexture surfaceTexture = new SurfaceTexture(0);
surfaceTexture.detachFromGLContext();
final SurfaceTextureRegistryEntry entry = new SurfaceTextureRegistryEntry(nextTextureId.getAndIncrement(),
surfaceTexture);
mNativeView.getFlutterJNI().registerTexture(entry.id(), surfaceTexture);
return entry;
}
final class SurfaceTextureRegistryEntry implements TextureRegistry.SurfaceTextureEntry {
private final long id;
private final SurfaceTexture surfaceTexture;
private boolean released;
SurfaceTextureRegistryEntry(long id, SurfaceTexture surfaceTexture) {
this.id = id;
this.surfaceTexture = surfaceTexture;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
// The callback relies on being executed on the UI thread (unsynchronised read of mNativeView
// and also the engine code check for platform thread in Shell::OnPlatformViewMarkTextureFrameAvailable),
// so we explicitly pass a Handler for the current thread.
this.surfaceTexture.setOnFrameAvailableListener(onFrameListener, new Handler());
} else {
// Android documentation states that the listener can be called on an arbitrary thread.
// But in practice, versions of Android that predate the newer API will call the listener
// on the thread where the SurfaceTexture was constructed.
this.surfaceTexture.setOnFrameAvailableListener(onFrameListener);
}
}
private SurfaceTexture.OnFrameAvailableListener onFrameListener = new SurfaceTexture.OnFrameAvailableListener() {
@Override
public void onFrameAvailable(SurfaceTexture texture) {
if (released || mNativeView == null) {
// Even though we make sure to unregister the callback before releasing, as of Android O
// SurfaceTexture has a data race when accessing the callback, so the callback may
// still be called by a stale reference after released==true and mNativeView==null.
return;
}
mNativeView.getFlutterJNI().markTextureFrameAvailable(SurfaceTextureRegistryEntry.this.id);
}
};
@Override
public SurfaceTexture surfaceTexture() {
return surfaceTexture;
}
@Override
public long id() {
return id;
}
@Override
public void release() {
if (released) {
return;
}
released = true;
// The ordering of the next 3 calls is important:
// First we remove the frame listener, then we release the SurfaceTexture, and only after we unregister
// the texture which actually deletes the GL texture.
// Otherwise onFrameAvailableListener might be called after mNativeView==null
// (https://github.com/flutter/flutter/issues/20951). See also the check in onFrameAvailable.
surfaceTexture.setOnFrameAvailableListener(null);
surfaceTexture.release();
mNativeView.getFlutterJNI().unregisterTexture(id);
}
}
}