Android 模拟按键功能实现

开发中遇到一个按键，需要发送两个键值，一帮情况下，只能一个按键只能发送一个键值，那两个键值怎么实现呢？其实就是一个api调用的事情，android都有现成的我们直接拿来用就可以了！

代码如下

java 复制代码

services/core/java/com/android/server/policy/PhoneWindowManager.java 下




  /* 模拟音量+键操作 */
    private final Runnable mKeyCodeVolumeUpHandler = new Runnable() {
        @Override
        public void run() {
             if (DEBUG_KEYGUARD) Slog.d(TAG, "mKeyCodeVolumeUpHandler run,send code KEYCODE_VOLUME_UP" );
            new Instrumentation().sendKeyDownUpSync(KeyEvent.KEYCODE_VOLUME_UP);
            autoSpinBtnChangeChannelDefaultMode.removeMessages(null);
            autoSpinBtnChangeChannelDefaultMode.sendMessageDelayed(Message.obtain(),3*1000);
        }
    };


    /* 模拟音量-操作 */
    private final Runnable mKeyCodeVolumeDownHandler = new Runnable() {
        @Override
        public void run() {
            if (DEBUG_KEYGUARD) Slog.d(TAG, "mKeyCodeVolumeUpHandler run,send code KEYCODE_VOLUME_DOWN" );
            new Instrumentation().sendKeyDownUpSync(KeyEvent.KEYCODE_VOLUME_DOWN);
            autoSpinBtnChangeChannelDefaultMode.removeMessages(null);
            autoSpinBtnChangeChannelDefaultMode.sendMessageDelayed(Message.obtain(),3*1000);
        }
    };



 // TODO(b/117479243): handle it in InputPolicy
    /** {@inheritDoc} */
    @Override
    public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
        final int keyCode = event.getKeyCode();
        final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
        boolean isWakeKey = (policyFlags & WindowManagerPolicy.FLAG_WAKE) != 0
                || event.isWakeKey();
          
      if (CHANNEL_UP_KEY == event.getKeyCode()) {
            //
            mHandler.post(mKeyCodeVolumeUpHandler);
            if (DEBUG_KEYGUARD) Slog.d(TAG, "CHANNEL_UP_KEY to click,  simulate to            volume up action");


        }else if (CHANNEL_DOWN_KEY == event.getKeyCode()) {
            if (DEBUG_KEYGUARD) Slog.d(TAG, "CHANNEL_DOWN_KEY to click,  simulate to volume down action");
            mHandler.post(mKeyCodeVolumeDownHandler);


        }

 }

以上代码中，在interceptKeyBeforeQueueing 方法中，拦截指定键值，然后调用发送一个handler的任务，然后在runnable中实现模拟按键就可以了！

参考文章：

Instrumentation中的sendKeyDownUpSync的调用过程