Android 如何让app自行处理power key

Power key 通常都是由 framework 自行处理的，app 无法拿到这个 key 值。

如果想让某个 app 自行处理 power key

应该要怎么做呢?

1: 修改 phoneWindowManager.java 的 interceptKeyBeforeQueueing 方法,在 reference line 后加入下面这段代码
case KeyEvent.KEYCODE_POWER: { //reference line
 result &= ~ACTION_PASS_TO_USER; //reference line

  // add begin
 ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
 try{
  if (activityManager.getRunningTasks(1).get(0).topActivity.getPackageName().equals("your_special_package_name")){ 
   //Please reset the special package name.
   result |= ACTION_PASS_TO_USER;
   Xlog.d(TAG,"detect power key in special package, pass to user!")
  }
 }catch(NullPointerException e){
  Xlog.d(TAG,"ingore a NullPointerException ..");
 }

 //add end

2: 同样在此分支内, 找到 else 语句段, 并找到如下位置加入

if (interceptPowerKeyUp(canceled || mPendingPowerKeyUpCanceled)) { //参考行
                      if(!((result & ACTION_PASS_TO_USER) == ACTION_PASS_TO_USER)){ //加入行
                          result = (result & ~ACTION_WAKE_UP) | ACTION_GO_TO_SLEEP; //原有代码
                      } //加入行
              }

注意: 以上蓝色背景部分的内容需要替换为您预期要处理 power key 的 app 对应的 package name.

3.app重写onKeyDown()

 @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_POWER) {
      Log.e("xxx", "KeyEvent.KEYCODE_POWER =  " + KeyEvent.KEYCODE_POWER+"" );
    }
    return super.onKeyDown(keyCode, event);
  }
  @Override
  public boolean onKeyUp(int keyCode, KeyEvent event) {
    Log.e("xxx", "onKeyUp =  " + KeyEvent.KEYCODE_POWER+"" );
    return super.onKeyUp(keyCode, event);
  }