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99
...ndroid-core/src/main/java/io/sentry/android/core/internal/util/FirstDrawDoneListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package io.sentry.android.core.internal.util; | ||
|
|
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| import android.annotation.SuppressLint; | ||
| import android.os.Build; | ||
| import android.os.Handler; | ||
| import android.os.Looper; | ||
| import android.view.View; | ||
| import android.view.ViewTreeObserver; | ||
| import androidx.annotation.RequiresApi; | ||
| import io.sentry.android.core.BuildInfoProvider; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
| import org.jetbrains.annotations.NotNull; | ||
|
|
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| /** | ||
| * OnDrawListener that unregisters itself and invokes callback when the next draw is done. This API | ||
| * 16+ implementation is an approximation of the initial-display-time defined by Android Vitals. | ||
| * | ||
| * <p>Adapted from <a | ||
| * href="https://github.com/firebase/firebase-android-sdk/blob/master/firebase-perf/src/main/java/com/google/firebase/perf/util/FirstDrawDoneListener.java">Firebase</a> | ||
| * under the Apache License, Version 2.0. | ||
| */ | ||
| @SuppressLint("ObsoleteSdkInt") | ||
| @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN) | ||
| public class FirstDrawDoneListener implements ViewTreeObserver.OnDrawListener { | ||
| private final @NotNull Handler mainThreadHandler = new Handler(Looper.getMainLooper()); | ||
| private final @NotNull AtomicReference<View> viewReference; | ||
| private final @NotNull Runnable callback; | ||
|
|
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| /** Registers a post-draw callback for the next draw of a view. */ | ||
| public static void registerForNextDraw( | ||
| final @NotNull View view, | ||
| final @NotNull Runnable drawDoneCallback, | ||
| final @NotNull BuildInfoProvider buildInfoProvider) { | ||
| final FirstDrawDoneListener listener = new FirstDrawDoneListener(view, drawDoneCallback); | ||
| // Handle bug prior to API 26 where OnDrawListener from the floating ViewTreeObserver is not | ||
| // merged into the real ViewTreeObserver. | ||
| // https://android.googlesource.com/platform/frameworks/base/+/9f8ec54244a5e0343b9748db3329733f259604f3 | ||
| if (buildInfoProvider.getSdkInfoVersion() < 26 | ||
| && !isAliveAndAttached(view, buildInfoProvider)) { | ||
| view.addOnAttachStateChangeListener( | ||
| new View.OnAttachStateChangeListener() { | ||
| @Override | ||
| public void onViewAttachedToWindow(View view) { | ||
| view.getViewTreeObserver().addOnDrawListener(listener); | ||
| view.removeOnAttachStateChangeListener(this); | ||
| } | ||
|
|
||
| @Override | ||
| public void onViewDetachedFromWindow(View view) { | ||
| view.removeOnAttachStateChangeListener(this); | ||
| } | ||
| }); | ||
| } else { | ||
| view.getViewTreeObserver().addOnDrawListener(listener); | ||
| } | ||
| } | ||
|
|
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| private FirstDrawDoneListener(final @NotNull View view, final @NotNull Runnable callback) { | ||
| this.viewReference = new AtomicReference<>(view); | ||
| this.callback = callback; | ||
| } | ||
|
|
||
| @Override | ||
| public void onDraw() { | ||
| // Set viewReference to null so any onDraw past the first is a no-op | ||
| final View view = viewReference.getAndSet(null); | ||
| if (view == null) { | ||
| return; | ||
| } | ||
| // OnDrawListeners cannot be removed within onDraw, so we remove it with a | ||
| // GlobalLayoutListener | ||
| view.getViewTreeObserver() | ||
| .addOnGlobalLayoutListener(() -> view.getViewTreeObserver().removeOnDrawListener(this)); | ||
| mainThreadHandler.postAtFrontOfQueue(callback); | ||
| } | ||
|
|
||
| /** | ||
| * Helper to avoid <a | ||
| * href="https://android.googlesource.com/platform/frameworks/base/+/9f8ec54244a5e0343b9748db3329733f259604f3">bug | ||
| * prior to API 26</a>, where the floating ViewTreeObserver's OnDrawListeners are not merged into | ||
| * the real ViewTreeObserver during attach. | ||
| * | ||
| * @return true if the View is already attached and the ViewTreeObserver is not a floating | ||
| * placeholder. | ||
| */ | ||
| private static boolean isAliveAndAttached( | ||
| final @NotNull View view, final @NotNull BuildInfoProvider buildInfoProvider) { | ||
| return view.getViewTreeObserver().isAlive() && isAttachedToWindow(view, buildInfoProvider); | ||
| } | ||
|
|
||
| @SuppressLint("NewApi") | ||
| private static boolean isAttachedToWindow( | ||
| final @NotNull View view, final @NotNull BuildInfoProvider buildInfoProvider) { | ||
| if (buildInfoProvider.getSdkInfoVersion() >= 19) { | ||
| return view.isAttachedToWindow(); | ||
| } | ||
| return view.getWindowToken() != null; | ||
| } | ||
| } |
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