如何检测音量按钮在Android的长期preSS [英] how to detect long press of volume button in android
问题描述
我工作的应用程序中，我想提供方便用户做特定的事情，当你长时间preSS向上或向下音量键，无论我的应用程序是背景或前景。
我也想实现这个功能，当手机屏幕关闭，但在堆栈溢出的帖子说，你不能做到这一点。
我用 android.media.VOLUME_CHANGED_ACTION 广播监听音量按钮preSS检测，它做工精细，无论您的应用程序的背景，但事情是，我想检测这些按钮隆preSS。
我怎么能有这种code进入我的直播，所以我可以检测向上或向下键preSS长时间。
@覆盖
公共布尔的onkeyup（INT键code，KeyEvent的事件）{
如果（键code == KeyEvent.KEY code_VOLUME_UP）{
//做的东西在这里...
//用来跟踪长presses
Log.e（主要业务，KEY code_VOLUME_UP）;
返回true;
}
返回super.onKeyDown（键code，事件）;
}
这是我的广播接收器
intentfliter =新的IntentFilter（android.media.VOLUME_CHANGED_ACTION）;
mReceiver =新的BroadcastReceiver（）
{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
// TODO自动生成方法存根
Log.e（主要业务，音量键preSS）;
}
};
。getApplicationContext（）registerReceiver（mReceiver，intentfliter）;
manager.registerMediaButtonEventReceiver（getCallingActivity（））;
}
包com.example.androidsample;
进口java.util.Timer中;
进口java.util.TimerTask中;
进口java.util.logging.Logger中;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
公共类音量按钮pressedBroadcast延伸的BroadcastReceiver {
公共静态布尔sIsReceived; //这是由真假每个定时器时钟后，
公共静态定时STIMER = NULL;
公共静态INT I;
最终诠释MAX_ITERATION = 15;
公共静态布尔sIsAppWorkFinished = TRUE;
@覆盖
公共无效的onReceive（最终上下文的背景下，意图意图）
{
sIsReceived = TRUE; //使这个真实每当isReceived称为
如果（STIMER == NULL和放大器;＆安培; sIsAppWorkFinished）{
STIMER =新的Timer（）;
sTimer.schedule（新的TimerTask（）{
@覆盖
公共无效的run（）{
如果（sIsReceived）{//如果属实则意味着用户仍然是pressing按钮
我++;
}其他{//在这种情况下，用户必须已经发布了按钮，所以我们必须复位定时器
取消（）;
sTimer.cancel（）;
sTimer.purge（）;
STIMER = NULL;
I = 0;
}
如果（I＆GT; = MAX_ITERATION）{//在这种情况下，我们已经成功地检测到的长preSS事件
取消（）;
sTimer.cancel（）;
sTimer.purge（）;
STIMER = NULL;
I = 0;
//这是在3秒后叫
}
sIsReceived = FALSE; //使这种虚假每次定时器迭代
}
}，0，200）;
}
}
}
I am working on application in which i want to provide facility to user to do specific thing when you long press up or down volume button no matter my app is background or foreground.
I also want to implement this functionality when phone screen off but in stack-overflow posts says you cant do that.
i have used android.media.VOLUME_CHANGED_ACTION broadcast listener for volume button press detection and it work fine no matter your app is background but thing is that i want to detect Long press of these buttons.
how can i include this code into my broadcast so i can detect up or down button press for long time.
@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);
}
This is my broadcast receiver
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());
}
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);
}
}
}
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