Android surfaceflinger测试应用SurfaceFlinger test code任务目标在这个测试用例中调用surfaceflinger的API实现在手机屏幕上绘制一块纯色区域代码surfaceFlinger_test.cpp#include cutils/memory.h #include utils/Log.h #include android/native_window.h #include binder/IPCThreadState.h #include binder/ProcessState.h #include binder/IServiceManager.h #include gui/Surface.h #include gui/SurfaceComposerClient.h using namespace android; int main(int argc, char** argv) { // set up the thread-pool spProcessState proc(ProcessState::self()); ProcessState::self()-startThreadPool(); // create a client to surfaceflinger spSurfaceComposerClient client new SurfaceComposerClient(); spSurfaceControl surfaceControl client-createSurface(String8(resize), 320, 240, PIXEL_FORMAT_RGB_565, 0); spSurface surface surfaceControl-getSurface(); SurfaceComposerClient::Transaction transaction; transaction.setLayer(surfaceControl, 100000); transaction.setSize(surfaceControl, 320, 240); transaction.show(surfaceControl); transaction.apply(); ANativeWindow_Buffer outBuffer; surface-lock(outBuffer, NULL); ssize_t bpr outBuffer.stride * bytesPerPixel(outBuffer.format); // 填充每个像素为 RGB565 格式下的绿色0x07E0 uint16_t greenColor 0x07E0; for (int i 0; i outBuffer.height; i) { uint16_t *row (uint16_t*)((char*)outBuffer.bits i * bpr); for (int j 0; j outBuffer.width; j) { row[j] greenColor; } } surface-unlockAndPost(); IPCThreadState::self()-joinThreadPool(); return 0; }Android.bpcc_binary { name: surfaceFlinger_test, include_dirs: [ frameworks/native/include, system/core/include, system/libbase/include, frameworks/native/libs/gui, ], srcs: [surfaceFlinger_test.cpp], shared_libs: [ libui, libcutils, libutils, libbinder, libgui, libvndksupport, libbinder_ndk, ], }编译在platform_vendor/frameworks/native/ 路径下创建文件夹a_test并在该文件夹下添加surfaceFlinger_test.cpp和Android.bp两个文件在该文件夹路径下指令mmsoong构建系统的构建命令编译通过的结果验证刷机adb root adb push ./path/surfaceFlinger_test /data/local/tmp/为什么是 data/local/tmp 这里参考来源是/frameworks/native/services/surfaceflinger/tests/AndroidTest.xml 文件中说明了总结在这个测试用例编写过程中网上搜了许多都是比较老的帖子很多函数都已经过时了如SurfaceComposerClient::openGlobalTransaction(); surfaceControl-setSize(320, 240); SurfaceComposerClient::closeGlobalTransaction(); android_memset16((uint16_t*)outBuffer.bits, 0x07E0, bpr*outBuffer.height);通过查询资料和源码找到了对应的解决方法就是使用Transaction 事件新的写法如下SurfaceComposerClient::Transaction transaction; transaction.setLayer(surfaceControl, 100000); transaction.setSize(surfaceControl, 320, 240); transaction.show(surfaceControl); transaction.apply();这个测试用例虽然很简单但比起直接阅读庞大的surfaceflinger.cpp来说更便于理解surfaceflinger的工作方式是学习surfaceflinger的0-1的突破后面可以基于这个demo来做进一步进阶调用更多的API逐步加深对surfaceflinger的理解。