android中sevice制作mp3出现异常，eclipse编译无异常

Question

12-02 00:48:49.783: ERROR/AndroidRuntime(314): FATAL EXCEPTION: main
12-02 00:48:49.783: ERROR/AndroidRuntime(314): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.Mp3/com.Mp3.Mp3TestActivityActivity}: java.lang.ClassNotFoundException: com.Mp3.Mp3TestActivityActivity in loader dalvik.system.PathClassLoader[/data/app/com.Mp3-2.apk]
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.os.Looper.loop(Looper.java:123)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.ActivityThread.main(ActivityThread.java:4627)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at java.lang.reflect.Method.invokeNative(Native Method)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at java.lang.reflect.Method.invoke(Method.java:521)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at dalvik.system.NativeStart.main(Native Method)
12-02 00:48:49.783: ERROR/AndroidRuntime(314): Caused by: java.lang.ClassNotFoundException: com.Mp3.Mp3TestActivityActivity in loader dalvik.system.PathClassLoader[/data/app/com.Mp3-2.apk]
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
12-02 00:48:49.783: ERROR/AndroidRuntime(314):     ... 11 more

Answer 1

没有在AndroidManifest.xml中添加Service

Answer 2

在AndroidManifext.xml中添加Service了

Answer 3

看代码 ，我猜测是因为你启动service中的mediaplayer 的播放时机有问题

Answer 4

package com.Mp3;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class Mp3TestActivity extends Activity { private Button start;
private Button stop;
private Intent i;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
start = (Button) this.findViewById(R.id.start);
stop = (Button) this.findViewById(R.id.stop);

// 指向MP3播放Service的action
i = new Intent("com.kennan.android.music");

start.setOnClickListener(startListener);
stop.setOnClickListener(stopListener);

} private OnClickListener startListener = new OnClickListener() { public void onClick(View v) {
// 开始服务
Mp3TestActivity.this.startService(i);
} }; private OnClickListener stopListener = new OnClickListener() { public void onClick(View v) {
// 结束服务
Mp3TestActivity.this.stopService(i);
}
};
}

Answer 5

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.Mp3"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Mp3TestActivityActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 <service android:name=".MusicService">  
           <intent-filter>  
               <action android:name="com.kennan.android.music" />  
               <category android:name="android.intent.category.DEFAULT" />  
           </intent-filter>  
       </service>  
    </application>
</manifest>

Answer 6

package com.Mp3;   
  
import android.app.Service;   
import android.content.Intent;   
import android.media.MediaPlayer;   
import android.os.IBinder;   
  
public class MusicService extends Service {   
  
    private MediaPlayer player;   
  
    public IBinder onBind(Intent arg0) {   
        return null;   
    }   
  
    public void onStart(Intent intent, int startId) {   
        super.onStart(intent, startId);   
// 在服务开始时，启动MP3播放   
        player = MediaPlayer.create(this, R.raw.a);   
        player.start();   
    }   
  
    public void onDestroy() {   
// 在服务消灭时，关闭MP3播放          
     player.stop();   
        super.onDestroy();   
    }   
}