android 拦截按键改变按键

最新推荐文章于 2021-10-28 13:25:34 发布

原创最新推荐文章于 2021-10-28 13:25:34 发布 · 2.3k 阅读

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#android

本文探讨了在Android系统中如何通过按键事件的监听与派发机制，实现DPAD_LEFT和DPAD_RIGHT按键的映射到DPAD_UP和DPAD_DOWN的功能。文中详细介绍了dispatchKeyEvent方法的覆盖，用于捕捉特定的按键事件并创建新的KeyEvent对象来模拟其他按键行为。此外，还介绍了一个在新线程中运行的simulateKey方法，用于与输入法管理器交互，从而完成按键的模拟。

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
   if (event.getAction() == KeyEvent.ACTION_DOWN) {
      if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
         KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_UP);
         simulateKey(keyEvent);

         return true;
      } else if (event.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {
         KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_DOWN);
         simulateKey(keyEvent);
         return true;
      }
   }

   return super.dispatchKeyEvent(event);
}

public void simulateKey(final KeyEvent keyCode) {

   new Thread() {
      @Override
      public void run() {
         try {
            InputMethodManager systemService = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
            systemService.dispatchKeyEventFromInputMethod(getRootView(), keyCode);
         } catch (Exception e) {

         }
      }

   }.start();

}