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Prevent long flash when switching to Flutter app. (#47903) (flutter/engine#16527)

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This commit is contained in:
Matt Carroll 2020-02-11 15:26:27 -08:00 committed by GitHub
parent d7902954e9
commit d9dfa09e64
1 changed files with 14 additions and 23 deletions
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37
engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterActivityAndFragmentDelegate.java
View File

@ -12,7 +12,6 @@ import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.VisibleForTesting;
@ -238,8 +237,14 @@ import java.util.Arrays;
*
* <p>{@code inflater} and {@code container} may be null when invoked from an {@code Activity}.
*
* <p>This method creates a new {@link FlutterView}, adds a {@link FlutterUiDisplayListener} to
* it, and then returns it.
* <p>This method:
*
* <ol>
* <li>creates a new {@link FlutterView} in a {@code View} hierarchy
* <li>adds a {@link FlutterUiDisplayListener} to it
* <li>attaches a {@link FlutterEngine} to the new {@link FlutterView}
* <li>returns the new {@code View} hierarchy
* </ol>
*/
@NonNull
View onCreateView(
@ -261,6 +266,9 @@ import java.util.Arrays;
}
flutterSplashView.displayFlutterViewWithSplash(flutterView, host.provideSplashScreen());
Log.v(TAG, "Attaching FlutterEngine to FlutterView.");
flutterView.attachToFlutterEngine(flutterEngine);
return flutterSplashView;
}
@ -281,31 +289,13 @@ import java.util.Arrays;
* <p>
*
* <ol>
* <li>Attaches the {@link FlutterEngine} owned by this delegate to the {@link FlutterView}
* owned by this delegate.
* <li>Begins executing Dart code, if it is not already executing.
* </ol>
*/
void onStart() {
Log.v(TAG, "onStart()");
ensureAlive();
// We post() the code that attaches the FlutterEngine to our FlutterView because there is
// some kind of blocking logic on the native side when the surface is connected. That lag
// causes launching Activitys to wait a second or two before launching. By post()'ing this
// behavior we are able to move this blocking logic to after the Activity's launch.
// TODO(mattcarroll): figure out how to avoid blocking the MAIN thread when connecting a surface
new Handler()
.post(
new Runnable() {
@Override
public void run() {
Log.v(TAG, "Attaching FlutterEngine to FlutterView.");
flutterView.attachToFlutterEngine(flutterEngine);
doInitialFlutterViewRun();
}
});
doInitialFlutterViewRun();
}
/**
@ -418,7 +408,6 @@ import java.util.Arrays;
Log.v(TAG, "onStop()");
ensureAlive();
flutterEngine.getLifecycleChannel().appIsPaused();
flutterView.detachFromFlutterEngine();
}
/**
@ -429,6 +418,8 @@ import java.util.Arrays;
void onDestroyView() {
Log.v(TAG, "onDestroyView()");
ensureAlive();
flutterView.detachFromFlutterEngine();
flutterView.removeOnFirstFrameRenderedListener(flutterUiDisplayListener);
}