View刷新过程Java-JNI

最新推荐文章于 2022-11-28 15:15:46 发布

原创最新推荐文章于 2022-11-28 15:15:46 发布 · 307 阅读

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本文详细介绍了Android中View的刷新过程，从Java层的invalidate方法调用开始，经过一系列的调度和同步机制，最终触发屏幕的重绘。涉及View、ViewRootImpl及Choreographer等关键组件的工作原理。

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这里只讨论Java<->JNI之间的刷新，仅限CPU部分。GPU和Display部分需要看C++源码，暂时忽略

View
- invalidate()
- requestFocus()
ViewParent
- invalidateChild()
ViewGroup
- invalidateChildInParent()
ViewRootImpl
- invalidate()
- invalidateRectOnScreen()
ViewRootImpl
- scheduleTraversals()
Choreographer
- postCallback(Choreographer.CALLBACK_TRAVERSAL, mTraversalRunnable, null);
- scheduleFrameLocked(now);
- scheduleVsyncLocked()
FrameDisplayEventReceiver
- scheduleVsync()
- nativeScheduleVsync(mReceiverPtr);
android_view_DisplayEventReceiver
- nativeScheduleVsync()
- reveiver->scheduleVsync()
DisplayEventReceiver
- dispatchVsync
Choreographer.FrameDisplayEventReceiver
- onVsync
Choreographer.FrameHandler
- handleCallback
Choreographer.FrameDisplayEventReceiver
- run
Choreographer
- doFrame(System.nanoTime(), 0);