Question

在我的应用程序中，我使用Service播放MediaPlayer，以更新SeekBar 我在服务

中做了计时器任务

timer = new Timer();
timer.scheduleAtFixedRate(new RemindTask(), 0, 1 * 1000);

class RemindTask extends TimerTask {
    @Override
    public void run() {
        if (mediaPlayer!=null && mediaPlayer.isPlaying()){
           MusicPlayerActivity.progress=mediaPlayer.getCurrentPosition();
           MusicPlayerActivity.total=mediaPlayer.getDuration();
        }
    }
}

并使用runnable list我在活动页面中创建了一个run方法，

@Override
public void run()
{
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            seekBar.setMax(total);
            seekBar.setProgress(progress);
        }
    });
}

但我的问题是应用程序非常缓慢而且卡住了。

Answer 1

使用BroadcastReceiver将搜索栏表单服务更新为活动

在活动中添加广播以更新搜索栏

BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            //do something based on the intent's action
            // UPDATE YOUR UI FROM HERE
        }
    };

在下面的活动中注册接收器

@Override
    protected void onResume() {
        super.onResume();
        registerReceiver(receiver, filter);
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(receiver);
    }

从您的服务发送广播 - ＆gt;在您的服务中添加以下代码以进行广播

Intent intent = new Intent();
intent.setAction("android.mybroadcast");
this.context.sendBroadcast(intent);

在意图中传递数据 - ＆gt;搜索栏的整数值：）

Answer 2

投入使用以更新搜索变量（全局和静态变量）的值

#Check for files that do not contain the language string
    RewriteCond %{REQUEST_URI} !^/[a-z]{2}/.*
    RewriteRule ^(.*)$ $1?lang=en [QSA,L]

#Capture the language string and present it as the variable
RewriteCond %{REQUEST_URI} ^/([a-z]{2})/(.*)
RewriteRule ^.* %2?lang=%1 [QSA,L]

在您的活动中：

     private final Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg){


      //  update the seek variable here
        }
    };

Answer 3

如果您需要为活动通信提供服务，请使用绑定服务 check it here。或者使用EventBus

等库

Answer 4

您可以在https://github.com/googlesamples/android-UniversalMusicPlayer/blob/master/mobile/src/main/java/com/example/android/uamp/ui/FullScreenPlayerActivity.java中的android-UniversalMusicPlayer参考实现中找到有效的解决方案。

该概念涉及在MediaSession实例上设置当前位置，然后轮询MediaController以获取更改+计算当前位置：

private void updateProgress() {
    if (mLastPlaybackState == null) {
        return;
    }
    long currentPosition = mLastPlaybackState.getPosition();
    if (mLastPlaybackState.getState() != PlaybackState.STATE_PAUSED) {
        // Calculate the elapsed time between the last position update and now and unless
        // paused, we can assume (delta * speed) + current position is approximately the
        // latest position. This ensure that we do not repeatedly call the getPlaybackState()
        // on MediaController.
        long timeDelta = SystemClock.elapsedRealtime() -
                mLastPlaybackState.getLastPositionUpdateTime();
        currentPosition += (int) timeDelta * mLastPlaybackState.getPlaybackSpeed();
    }
    mSeekbar.setProgress((int) currentPosition);
}

如何从服务中运行的MediaPlayer更新SeekBar？

4 个答案: