如何在android中检测长按音量按钮

Question

我正在开发应用程序，无论我的应用程序是后台还是前台，我都希望在您长按音量增大或减小按钮时为用户提供执行特定操作的功能。

我也想在手机屏幕关闭时实现此功能，但在堆栈溢出帖子中说你不能这样做。

我已经使用android.media.VOLUME_CHANGED_ACTION 广播监听器进行音量按钮按下检测，无论你的应用是后台的，它都能正常工作，但问题是我想检测这些按钮的长按。

如何将此代码包含到我的广播中，以便我可以长时间检测向上或向下按钮。

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
        // Do something here...
       // Needed to track long presses
        Log.e("Main activity", "KEYCODE_VOLUME_UP");
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

这是我的广播接收器

 intentfliter  = new IntentFilter("android.media.VOLUME_CHANGED_ACTION");
       mReceiver  = new BroadcastReceiver()
                {   
                @Override
                public void onReceive(Context context, Intent intent) {
                    // TODO Auto-generated method stub
                         Log.e("Main activity", "Volume button press");     
                }
                };
                getApplicationContext().registerReceiver(mReceiver, intentfliter); 
                 manager.registerMediaButtonEventReceiver(getCallingActivity());


     }

Answer 1

package com.example.androidsample;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Logger;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;




public class VolumeButtonPressedBroadcast extends BroadcastReceiver{

    public static boolean sIsReceived; // this is made true and false after each timer clock
    public static Timer sTimer=null;
    public static int i;
    final int MAX_ITERATION=15;
    public static boolean sIsAppWorkFinished=true;
    @Override
    public void onReceive(final Context context, Intent intent) 
    {


        sIsReceived=true; // Make this true whenever isReceived called
        if(sTimer==null && sIsAppWorkFinished){
            sTimer=new Timer();
            sTimer.schedule(new TimerTask() {

                @Override
                public void run() {
                    if(sIsReceived){  // if its true it means user is still pressing the button
                        i++;
                    }else{ //in this case user must has released the button so we have to reset the timer
                        cancel(); 
                        sTimer.cancel();
                        sTimer.purge();
                        sTimer=null;
                        i=0;
                    }
                    if(i>=MAX_ITERATION){ // In this case we had successfully detected the long press event
                        cancel();
                        sTimer.cancel();
                        sTimer.purge();
                        sTimer=null;
                        i=0;
                        //it is called after 3 seconds
                    }

                    sIsReceived=false; //Make this false every time a timer iterates
                }
            }, 0, 200);
        }

    }

}