Service后台播放音乐

Service后台播放音乐和上次播放音乐是一样的，只不过MediaPlayer由Service管理

1.工程文件

工程文件如上图

2.UI界面

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >


    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/app_name" />


    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/start" />


    <Button
        android:id="@+id/stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/stop" />


</LinearLayout>

3 MusicService.java

package com.example.musicplayer;


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


public class MusicService extends Service {
    private MediaPlayer player;
    @Override
    public void onCreate(){
    player = MediaPlayer.create(this, R.raw.test);
    }
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
player.release();
}
@Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
player.start();
}



}

4.MainActivity.java

package com.example.musicplayer;


import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;


public class MainActivity extends ActionBarActivity {
    private Button start;
    private Button stop;
    Intent intent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        start = (Button)findViewById(R.id.start);
        stop = (Button)findViewById(R.id.stop);
        start.setOnClickListener(new NewOnClickListener());
        stop.setOnClickListener(new NewOnClickListener());
        intent = new Intent(MainActivity.this,MusicService.class);

    }


    class NewOnClickListener implements OnClickListener{


@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.start:{
startService(intent);
break;
}
case R.id.stop:{
stopService(intent);
break;
}
default:break;
}
}
   
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

5Manifest.xml

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


    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.musicplayer.MainActivity"
            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="com.example.musicplayer.MusicService">
              
            </service>
    </application>


</manifest>