模拟按键消息

最新推荐文章于 2020-11-26 23:10:07 发布

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#模拟按键 Android

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本文探讨了在Android 4.0及之前版本和4.1以后版本下，如何通过反射机制和InputManager接口实现模拟按键消息。特别关注了4.1版本后IWindowManager中injectKeyEvent方法的改变，并提供了完整的模拟按键消息函数实现。

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在android 4.0及之前版本上，模拟按键消息的接口可以用反射机制获取到：

long now = SystemClock.uptimeMillis();
KeyEvent down = new KeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode, 0);
IWindowManager.Stub.asInterface(ServiceManager.getService("window")).injectKeyEvent(down, false);

在4.1以后版本，出于安全性考虑，injectKeyEvent在1.5中不再被IWindowManager实现。模拟按键消息可以采取这样的方法来实现：

InputManager.getInstance().injectInputEvent(down, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);

完整的模拟按键消息的函数实现：

private void simulateKeyEvent(final int keyCode) {
	//Log.i(TAG, "Simulate KeyEvent "+keyCode);

	Thread sendKeyEvent = new Thread() {
		@Override
		public void run() { 						
			try {
				Thread.sleep(100); //TouchEvent
				long now = SystemClock.uptimeMillis();
				KeyEvent down =  new KeyEvent(now, now,KeyEvent.ACTION_DOWN, keyCode, 0);
				KeyEvent up = new KeyEvent(now, now,KeyEvent.ACTION_UP, keyCode, 0);

				//IWindowManager.Stub.asInterface(ServiceManager.getService("window")).injectKeyEvent(down, false);	//[LYNN EDIT]
				//IWindowManager.Stub.asInterface(ServiceManager.getService("window")).injectKeyEvent(up, false);
				InputManager.getInstance().injectInputEvent(down, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
				InputManager.getInstance().injectInputEvent(up, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
			} catch (Exception e) {
				Log.e(TAG, "Simulate KeyEvent failed !!");
				e.printStackTrace();
			}				
		}
	};
		
	sendKeyEvent.start();
}

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