需求：用户点击屏幕后取消原有定时任务，无操作后顺延原来定时任务
简单分析
要想全局监听，那必须是在 framework 中了，应该从哪里切入呢？先看看 log，每点击一次屏幕后发现打印
InputDispatcher: Asynchronous input event injection succeeded.
全局搜索找到 frameworks\native\services\inputflinger\InputDispatcher.cpp 中
这就有点难顶了，cpp 中想要通知 java 层还是有点困难的，一开始尝试了在此处发送广播
#include <unistd.h> switch (injectionResult) { case INPUT_EVENT_INJECTION_SUCCEEDED: ALOGV(“Asynchronous input event injection succeeded.”); execlp(“am”, “am”, “broadcast”, “-n”, “com.android.systemui/com.pdd.sutie.CustomerReceiver”, “-a”, “com.pdd.action.inputevent.inject”, NULL); exit(errno);
通过函数 execlp() 调用 am 指令发送广播，尝试后发现会把 system 进程搞挂，看来 execlp() 不能在此使用，那就只能搂底浆了，
从 cpp 往上找，最终找到
frameworks\base\services\core\java\com\android\server\input\InputManagerService.java 中
调用顺序如下
InputManagerService.java injectInputEventInternal(event, mode) com_android_server_input_InputManagerService.cpp im->getInputManager()->getDispatcher()->injectInputEvent( InputDispatcher.cpp int32_t InputDispatcher::injectInputEvent(const InputEvent* event, int32_t injectorPid, int32_t injectorUid, int32_t syncMode, int32_t timeoutMillis, uint32_t policyFlags)
解决办法
frameworks\base\services\core\java\com\android\server\input\InputManagerService.java
@Override // Binder call public boolean injectInputEvent(InputEvent event, int mode) { return injectInputEventInternal(event, mode); } private boolean injectInputEventInternal(InputEvent event, int mode) { if (event == null) { throw new IllegalArgumentException("event must not be null"); } if (mode != InputManager.INJECT_INPUT_EVENT_MODE_ASYNC && mode != InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH && mode != InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT) { throw new IllegalArgumentException("mode is invalid"); } final int pid = Binder.getCallingPid(); final int uid = Binder.getCallingUid(); final long ident = Binder.clearCallingIdentity(); final int result; try { result = nativeInjectInputEvent(mPtr, event, pid, uid, mode, INJECTION_TIMEOUT_MILLIS, WindowManagerPolicy.FLAG_DISABLE_KEY_REPEAT); } finally { Binder.restoreCallingIdentity(ident); } switch (result) { case INPUT_EVENT_INJECTION_PERMISSION_DENIED: Slog.w(TAG, "Input event injection from pid " + pid + " permission denied."); throw new SecurityException( "Injecting to another application requires INJECT_EVENTS permission"); case INPUT_EVENT_INJECTION_SUCCEEDED: //cczheng add for listen lcd input start android.util.Log.e("InputDispatcher", "Input event injection from pid " + pid + " succeeded."); Intent pIntent = new Intent("com.pdd.action.inputevent.inject"); pIntent.setComponent(new android.content.ComponentName("com.android.systemui", "com.pdd.sutie.CustomerReceiver")); mContext.sendBroadcast(pIntent); //cczheng add for listen lcd input end return true; case INPUT_EVENT_INJECTION_TIMED_OUT: Slog.w(TAG, "Input event injection from pid " + pid + " timed out."); return false; case INPUT_EVENT_INJECTION_FAILED: default: Slog.w(TAG, "Input event injection from pid " + pid + " failed."); return false; } }
