@覆盖
公共布尔dispatchKeyEvent（KeyEvent的事件）{
    INT行动= event.getAction（）;
    INT键code = event.getKey code（）;
        开关（钥匙code）{
        案例KeyEvent.KEY code_VOLUME_UP：
            如果（动作== KeyEvent.ACTION_UP）{
                //去做
            }
            返回true;
        案例KeyEvent.KEY code_VOLUME_DOWN：
            如果（动作== KeyEvent.ACTION_DOWN）{
                //去做
            }
            返回true;
        默认：
            返回super.dispatchKeyEvent（事件）;
        }
    }
 

这code在工作时屏幕上。但不是当屏幕被锁定。有没有办法让当屏幕被锁定音量键事件？

的事件仅触发时，屏幕on..other明智的root权限是必要的。

请一个BroadcastReceiver扩展分类

 公共类YourBoardcastReceiver扩展的BroadcastReceiver {
                @覆盖
                公共无效的onReceive（上下文的背景下，意图意图）{


Log.e（得到的东西，我不知道是什么！）;

        串intentAction = intent.getAction（）;
        KeyEvent的事件= NULL;
        如果（Intent.ACTION_MEDIA_BUTTON.equals（intentAction））{
            事件=（KeyEvent的）意图
                    .getParcelableExtra（Intent.EXTRA_KEY_EVENT）;
        }

        如果（事件== NULL）{
            返回;
        }

        INT键code = event.getKey code（）;
        INT行动= event.getAction（）;
        长eventtime = event.getEventTime（）;

        如果（键code == KeyEvent.KEY code_MEDIA_PLAY_PAUSE
                ||关键code == KeyEvent.KEY code_HEADSETHOOK）{
            如果（动作== KeyEvent.ACTION_DOWN）{
                //此处开始您的应用程序！

                // ...
                Log.e（事件/////，Trigerd）;

                如果（isOrderedBroadcast（））{
                    abortBroadcast（）;
                }
            }
        }
    }
                }
        }
 

而在你的清单：

 ＆LT;接收器的Andr​​oid版本：NAME =YourBoardcastReceiver＆GT;
                ＆LT;意向滤光器＆gt;
                        ＆lt;作用机器人：名称=android.intent.action.SCREEN_ON/＆GT;
                ＆所述; /意图滤光器＆gt;
＆LT; /接收器＆GT;
 

和调用它。

  mAudioManager =（AudioManager）getSystemService（Context.AUDIO_SERVICE）;
    mRemoteControlResponder =新的组件名（getPackageName（）
            YourBoardcastReceiver.class.getName（））;
 

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int action = event.getAction();
    int keyCode = event.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_VOLUME_UP:
            if (action == KeyEvent.ACTION_UP) {
                //TODO
            }
            return true;
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        default:
            return super.dispatchKeyEvent(event);
        }
    }

This code is working when screen is on. But not when screen is locked. Is there a way to get the volume key event when the screen is locked?

The event only trigger when the screen is on..other wise root permission is needed.

Make a BroadcastReceiver extended class

 public class YourBoardcastReceiver extends BroadcastReceiver {
                @Override
                public void onReceive(Context context, Intent intent) {


Log.e("get something", "i dont know what!!");

        String intentAction = intent.getAction();
        KeyEvent event = null;
        if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
            event = (KeyEvent) intent
                    .getParcelableExtra(Intent.EXTRA_KEY_EVENT);
        }

        if (event == null) {
            return;
        }

        int keycode = event.getKeyCode();
        int action = event.getAction();
        long eventtime = event.getEventTime();

        if (keycode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE
                || keycode == KeyEvent.KEYCODE_HEADSETHOOK) {
            if (action == KeyEvent.ACTION_DOWN) {
                // Start your app here!

                // ...
                Log.e("event/////", "Trigerd");

                if (isOrderedBroadcast()) {
                    abortBroadcast();
                }
            }
        }
    }
                }
        }

And in your Manifest :

<receiver android:name="YourBoardcastReceiver">
                <intent-filter>
                        <action android:name="android.intent.action.SCREEN_ON" />
                </intent-filter>
</receiver>

and Call it like this.

mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    mRemoteControlResponder = new ComponentName(getPackageName(),
            YourBoardcastReceiver.class.getName());