Question

我实现了我在这里找到的所有内容，但我的服务还没有开始。

我需要做的是在用户点击按钮时开始播放广播电台，并且只有在再次点击它时才停止播放。如果应用程序关闭，我不希望停止收音机。

当我测试我发送的代码时，没有任何反应。

清单：

<service
    android:name=".RadioService"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:exported="false"
>
</service>

服务代码：

package com.po.portelaonline.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

    public class RadioService extends Service {

    Player player;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return Service.START_NOT_STICKY;
    }

    @Override
    public void onCreate(){
        player = new Player();
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onDestroy(){
        player.stopThread();
    }

    }

玩家类代码：

package com.po.portelaonline.service;

import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;

import com.po.portelaonline.classes.Util;

class Player extends Thread {

volatile boolean running = true;

@Override
public void run() {

    MediaPlayer player = new MediaPlayer();

    try {

        player.setDataSource(Util.getRadioUrl());
        player.setOnPreparedListener(oplPlayer);
        player.prepareAsync();

        while (running) {
            Player.sleep(500);
        }

        player.release();
        player = null;

    } catch (Exception e) {
        e.printStackTrace();
    }

}

public void stopThread() {
    running = false;
}

OnPreparedListener oplPlayer = new OnPreparedListener() {

    @Override
    public void onPrepared(MediaPlayer mp) {
        mp.start();
    }
};

}

我这样称呼：

Intent i = new Intent(getApplicationContext(), RadioService.class);
if(getApplicationContext().startService(i) == null){
findViewById(R.id.btnPlayStop).setBackgroundDrawable(getApplicationContext().getResources().getDrawable(R.drawable.stop));
}else{
getApplicationContext().stopService(i);
findViewById(R.id.btnPlayStop).setBackgroundDrawable(getApplicationContext().getResources().getDrawable(R.drawable.play));
}

Answer 1

尝试使用此代码进行服务类。

您无需在单独的线程中创建MediaPlayer对象。 player.prepareAsync();已经异步。

修改：

进入AndroidManifest.xml的RadioService类的路径应该是绝对的：android:name="com.po.portelaonline.service.RadioService"

public class RadioService extends Service implements OnPreparedListener, OnErrorListener{ MediaPlayer mPlayer; @Override public int onStartCommand(Intent intent, int flags, int startId) { startPlayer(); return Service.START_NOT_STICKY; } @Override public void onCreate(){ initMediaPlayer(); } private void initMediaPlayer () { mPlayer = new MediaPlayer(); mPlayer.setOnPreparedListener(this); mPlayer.setOnErrorListener(this); mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK); } private void startPlayer(){ player.setDataSource(Util.getRadioUrl()); player.prepareAsync(); } @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; } @Override public void onDestroy(){ mPlayer.release(); } @Override public void onPrepared (MediaPlayer mp) { mp.start(); } @Override public boolean onError (MediaPlayer mp, int what, int extra) { Log.e("RadioService OnError", "what="+what+" extra="+extra); return false; } }

Answer 2

我猜它应该是 if(getApplicationContext().startService(i) != null) 而不是if(getApplicationContext().startService(i) == null)

启动后，您将立即停止服务。

Android服务无法正常启动

2 个答案: