背景上的電臺在線 - Android

-3

你能幫我解決這個問題嗎？我試圖讓一個廣播Android應用程序在後臺運行，但是我失敗了。你能不能幫我請...這是我的代碼：背景上的電臺在線 - Android

Background.java

package com.ihacks.radiolumina; 
import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.os.Binder; 
import android.content.Intent; 
import android.os.IBinder; 
import android.app.Service; 
import java.io.IOException; 

public class Background extends Service { 
private static final String TAG = null; 
MediaPlayer player; 
public IBinder onBind(Intent arg0) { 

    return null; 
} 
@Override 
public void onCreate() { 
    super.onCreate();   
    try { 
     player.setDataSource("http://www.radiolumina.ro:9000/;stream.nsv"); 
     } catch (IllegalArgumentException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } catch (SecurityException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } catch (IllegalStateException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } 

} 
public int onStartCommand(Intent intent, int flags, int startId) { 
    player.start(); 
    return 1; 
} 

public void onStart(Intent intent, int startId) { 
    // TO DO 
} 
public IBinder onUnBind(Intent arg0) { 
    // TO DO Auto-generated method 
    return null; 
} 

public void onStop() { 

} 
public void onPause() { 

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

@Override 
public void onLowMemory() { 

} 
}

Ecran.java

package com.ihacks.radiolumina; 

import java.io.IOException; 

import android.app.Activity; 
import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnBufferingUpdateListener; 
import android.media.MediaPlayer.OnPreparedListener; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ProgressBar; 
import android.content.Context; 
import android.media.AudioManager; 
import android.widget.SeekBar; 
import android.widget.SeekBar.OnSeekBarChangeListener; 
import android.content.Intent; 


public class Ecran extends Activity implements OnClickListener{ 
private Button btnStart, btnStop; 
private ProgressBar progressBar; 
private MediaPlayer player; 
private SeekBar volumeSeekbar = null; 
private AudioManager audioManager = null; 
Intent playbackServiceIntent; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setVolumeControlStream(AudioManager.STREAM_MUSIC); 
    setContentView(R.layout.activity_ecran);   
    init();  
    initMediaPlayer(); 
    Intent svc=new Intent(this, com.ihacks.radiolumina.Background.class); 
    startService(svc); 
} 


private void initMediaPlayer() { 
    player = new MediaPlayer(); 
    try { 
     player.setDataSource("http://www.radiolumina.ro:9000/;stream.nsv"); 
    } catch (IllegalArgumentException e) { 
     e.printStackTrace(); 
    } catch (SecurityException e) { 
     e.printStackTrace(); 
    } catch (IllegalStateException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() { 

     @Override 
     public void onBufferingUpdate(MediaPlayer mp, int percent) { 

      Log.d("Radio_Lumina", "Ecran.initMediaPlayer().new OnBufferingUpdateListener() {...}: "+percent); 

     } 
    }); 
} 

private void init() { 

    progressBar = (ProgressBar) findViewById(R.id.progressBar); 

    btnStart = (Button) findViewById(R.id.btnStart); 
    btnStop = (Button) findViewById(R.id.btnStop); 

    btnStart.setOnClickListener(this); 
    btnStop.setOnClickListener(this); 

    progressBar.setVisibility(View.GONE); 
    volumeSeekbar = (SeekBar)findViewById(R.id.seekBar1); 
    audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
    volumeSeekbar.setMax(audioManager 
      .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); 
    volumeSeekbar.setProgress(audioManager 
      .getStreamVolume(AudioManager.STREAM_MUSIC)); 
    volumeSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() 
    { 
     @Override 
     public void onStopTrackingTouch(SeekBar arg0) 
     { 
     } 

     @Override 
     public void onStartTrackingTouch(SeekBar arg0) 
     { 
     } 

     @Override 
     public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) 
     { 
      audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 
        progress, 0); 
     } 
    });} 
@Override 
    protected void onPause() { 
     super.onPause(); 
     if (player.isPlaying()) { 
      player.stop(); 
     } 
     } 

@Override 
public void onClick(View v) { 
    int id = v.getId(); 
    switch(id){ 
    case R.id.btnStart: 
     startPlaying(); 

     break; 
    case R.id.btnStop: 
     stopPlaying(); 

     break; 
    default: 
     break; 
    } 
} 

private void startPlaying() { 
    btnStop.setEnabled(true); 
    btnStart.setEnabled(false); 

    progressBar.setVisibility(View.VISIBLE); 

    //playSeekBar.setVisibility(View.VISIBLE); 

    player.prepareAsync(); 

    player.setOnPreparedListener(new OnPreparedListener() { 

     public void onPrepared(MediaPlayer mp) { 

      progressBar.setVisibility(View.GONE); 
      Log.v("Radio_Lumina", "Ecran.startPlaying().new OnPreparedListener() {...}: Start of radio"); 
      player.start(); 
     } 
    }); 
    startService(playbackServiceIntent); 

} 

private void stopPlaying() { 
    if (player.isPlaying()) { 
     player.stop(); 
     player.release(); 
     initMediaPlayer(); 
    } 

    btnStart.setEnabled(true); 
    btnStop.setEnabled(false); 
    //playSeekBar.setVisibility(View.INVISIBLE); 
    stopService(playbackServiceIntent); 
} 

}

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.ihacks.radiolumina" 
android:versionCode="1" 
android:versionName="2.0" > 

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="19" /> 
<permission android:name="android.permission.INTERNET"></permission> 
<uses-permission android:name="android.permission.INTERNET" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/FullscreenTheme" > 
    <activity 
     android:name="com.ihacks.radiolumina.Ecran" 
     android:configChanges="orientation|keyboardHidden|screenSize" 
     android:label="@string/app_name" 
     android:theme="@style/FullscreenTheme" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <service android:name="Background"></service> 
</application> 

</manifest>

這裏的日誌：

10:21:16.394: I/Process(2009): Sending signal. PID: 2009 SIG: 9 
06-10 10:21:29.334: D/dalvikvm(2057): GC_FOR_ALLOC freed 61K, 5% free 2882K/3028K, paused 34ms, total 36ms 
06-10 10:21:29.334: I/dalvikvm-heap(2057): Grow heap (frag case) to 4.329MB for 1507216-byte allocation 
06-10 10:21:29.384: D/dalvikvm(2057): GC_FOR_ALLOC freed 2K, 4% free 4351K/4500K, paused 43ms, total 43ms 
06-10 10:21:29.664: D/dalvikvm(2057): GC_FOR_ALLOC freed <1K, 4% free 4611K/4760K, paused 23ms, total 24ms 
06-10 10:21:29.664: I/dalvikvm-heap(2057): Grow heap (frag case) to 5.953MB for 1440016-byte allocation 
06-10 10:21:29.704: D/dalvikvm(2057): GC_FOR_ALLOC freed <1K, 3% free 6017K/6168K, paused 35ms, total 35ms 
06-10 10:21:30.244: D/AndroidRuntime(2057): Shutting down VM 
06-10 10:21:30.244: W/dalvikvm(2057): threadid=1: thread exiting with uncaught exception (group=0xb3aceba8) 
06-10 10:21:30.254: E/AndroidRuntime(2057): FATAL EXCEPTION: main 
06-10 10:21:30.254: E/AndroidRuntime(2057): Process: com.ihacks.radiolumina, PID: 2057 
06-10 10:21:30.254: E/AndroidRuntime(2057): java.lang.RuntimeException: Unable to create service com.ihacks.radiolumina.Background: java.lang.NullPointerException 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.app.ActivityThread.handleCreateService(ActivityThread.java:2582) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.app.ActivityThread.access$1800(ActivityThread.java:135) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.os.Handler.dispatchMessage(Handler.java:102) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.os.Looper.loop(Looper.java:136) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at java.lang.reflect.Method.invoke(Method.java:515) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at dalvik.system.NativeStart.main(Native Method) 
06-10 10:21:30.254: E/AndroidRuntime(2057): Caused by: java.lang.NullPointerException 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at com.ihacks.radiolumina.Background.onCreate(Background.java:24) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  at android.app.ActivityThread.handleCreateService(ActivityThread.java:2572) 
06-10 10:21:30.254: E/AndroidRuntime(2057):  ... 10 more 
06-10 10:26:30.654: I/Process(2057): Sending signal. PID: 2057 SIG: 9

你可以幫我嗎......我disperate;我也試圖用Fragments製作這個應用程序，但我可以將所有應用程序放在一起。

編輯

此代碼的工作，但不是在後臺;我也刪除了Background.java：

Ecran.java package com.ihacks.radiolumina;

import java.io.IOException; 

import android.app.Activity; 
import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnBufferingUpdateListener; 
import android.media.MediaPlayer.OnPreparedListener; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ProgressBar; 
import android.content.Context; 
import android.media.AudioManager; 
import android.widget.SeekBar; 
import android.widget.SeekBar.OnSeekBarChangeListener; 
import android.content.Intent; 


public class Ecran extends Activity implements OnClickListener{ 
private Button btnStart, btnStop; 
private ProgressBar progressBar; 
private MediaPlayer player; 
private SeekBar volumeSeekbar = null; 
private AudioManager audioManager = null; 
Intent playbackServiceIntent; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setVolumeControlStream(AudioManager.STREAM_MUSIC); 
    setContentView(R.layout.activity_ecran);   
    init();  
    initMediaPlayer(); 
} 


private void initMediaPlayer() { 
    player = new MediaPlayer(); 
    try { 
     player.setDataSource("http://www.radiolumina.ro:9000/;stream.nsv"); 
    } catch (IllegalArgumentException e) { 
     e.printStackTrace(); 
    } catch (SecurityException e) { 
     e.printStackTrace(); 
    } catch (IllegalStateException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() { 

     @Override 
     public void onBufferingUpdate(MediaPlayer mp, int percent) { 

      Log.d("Radio_Lumina", "Ecran.initMediaPlayer().new OnBufferingUpdateListener() {...}: "+percent); 

     } 
    }); 
} 

private void init() { 

    progressBar = (ProgressBar) findViewById(R.id.progressBar); 

    btnStart = (Button) findViewById(R.id.btnStart); 
    btnStop = (Button) findViewById(R.id.btnStop); 

    btnStart.setOnClickListener(this); 
    btnStop.setOnClickListener(this); 

    progressBar.setVisibility(View.GONE); 
    volumeSeekbar = (SeekBar)findViewById(R.id.seekBar1); 
    audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
    volumeSeekbar.setMax(audioManager 
      .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); 
    volumeSeekbar.setProgress(audioManager 
      .getStreamVolume(AudioManager.STREAM_MUSIC)); 
    volumeSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() 
    { 
     @Override 
     public void onStopTrackingTouch(SeekBar arg0) 
     { 
     } 

     @Override 
     public void onStartTrackingTouch(SeekBar arg0) 
     { 
     } 

     @Override 
     public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) 
     { 
      audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 
        progress, 0); 
     } 
    });} 
@Override 
    protected void onPause() { 
     super.onPause(); 
     if (player.isPlaying()) { 
      player.stop(); 
     } 
     } 

@Override 
public void onClick(View v) { 
    int id = v.getId(); 
    switch(id){ 
    case R.id.btnStart: 
     startPlaying(); 

     break; 
    case R.id.btnStop: 
     stopPlaying(); 

     break; 
    default: 
     break; 
    } 
} 

private void startPlaying() { 
    btnStop.setEnabled(true); 
    btnStart.setEnabled(false); 

    progressBar.setVisibility(View.VISIBLE); 

    //playSeekBar.setVisibility(View.VISIBLE); 

    player.prepareAsync(); 

    player.setOnPreparedListener(new OnPreparedListener() { 

     public void onPrepared(MediaPlayer mp) { 

      progressBar.setVisibility(View.GONE); 
      Log.v("Radio_Lumina", "Ecran.startPlaying().new OnPreparedListener() {...}: Start of radio"); 
      player.start(); 
     } 
    }); 


} 

private void stopPlaying() { 
    if (player.isPlaying()) { 
     player.stop(); 
     player.release(); 
     initMediaPlayer(); 
    } 

    btnStart.setEnabled(true); 
    btnStop.setEnabled(false); 
    //playSeekBar.setVisibility(View.INVISIBLE); 

} 

}

乾杯，阿德里安

來源

2014-06-10 Marinescu Adrian

什麼是預期的和實際的行爲？ –

第一個預期的行爲是能夠收聽廣播到應用程序和其他應用程序中，而實際的行爲是不起作用的。:( –

「不工作」你是什麼意思「不工作」？如果你想在SO上尋求幫助，那麼你需要更具體的瞭解更多 –

背景：顯示java.lang.NullPointerException

某處在你的代碼中有一個NullPointerException。它將在您的日誌中，通讀它。如果還建議閱讀this article on how to debug small programs。

來源

2014-06-10 14:53:28

我已經刪除了Background.java文件並從Ecran.java中刪除了一些行;但是我無法使它在後臺上工作.... –

背景上的電臺在線 - Android

回答

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