Android-Choreographer工作原理(1)

最新推荐文章于 2024-11-29 21:37:01 发布

2401_84121935

最新推荐文章于 2024-11-29 21:37:01 发布

阅读量390

点赞数 4

分类专栏：程序员文章标签： android

本文链接：https://blog.youkuaiyun.com/2401_84121935/article/details/138081415

版权

本文详细解释了Android系统中NativeDisplayEventReceiver如何处理Vsync信号，涉及JNI接口、DisplayEventDispatcher初始化、Choreographer的调度以及SurfaceFlinger的工作流程。重点在于Vsync信号的请求和处理机制。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

nativeInit是一个native方法，其实现在frameworks/base/core/jni/android_view_DisplayEventReceiver.cpp中：

static jlong nativeInit(JNIEnv* env, jclass clazz, jobject receiverWeak,
jobject messageQueueObj, jint vsyncSource) {
sp messageQueue = android_os_MessageQueue_getMessageQueue(env, messageQueueObj);
sp receiver = new NativeDisplayEventReceiver(env, receiverWeak, messageQueue, vsyncSource);
status_t status = receiver->initialize();
receiver->incStrong(gDisplayEventReceiverClassInfo.clazz); // retain a reference for the object
return reinterpret_cast(receiver.get());
}


NativeDisplayEventReceiver 继承自 DisplayEventDispatcher:

DisplayEventReceiver::DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource) {
sp sf(ComposerService::getComposerService());
if (sf != NULL) {
mEventConnection = sf->createDisplayEventConnection(vsyncSource);
if (mEventConnection !