主界面非常简单，就是3个按钮去实现。监听了返回键，弹出对话框，如果需要隐藏播放器，就将期移动到后台去。
在服务中就是把其设置为前台进程。
这里需要注意的是，在对当前Activity做处理的时候，需要将其启动模式做更改，不能使用默认的启动方式，使用
默认的启动方式的话，会造成我这里的通知跳转进播放器的时候，有两个一模一样的界面
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android:launchMode="singleTask"
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package cn.itcast.musicdemo1;
import cn.itcast.musicdemo1.dao.MusicI;
import cn.itcast.musicdemo1.service.BackgroundMusicService;
import android.os.Bundle;
import android.os.IBinder;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
public class MainActivity extends Activity implements OnClickListener {
private Button start;
private Button pause_resume;
private Button stop;
/** 服务中的接口 */
private MusicI mMusicI;
private MyServiceConnection conn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
start = (Button) findViewById(R.id.start);
pause_resume = (Button) findViewById(R.id.pause_resume);
stop = (Button) findViewById(R.id.stop);
start.setOnClickListener(this);
pause_resume.setOnClickListener(this);
stop.setOnClickListener(this);
/** 绑定服务 */
Intent service = new Intent(MainActivity.this,
BackgroundMusicService.class);
conn = new MyServiceConnection();
bindService(service, conn, BIND_AUTO_CREATE);
}
class MyServiceConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mMusicI = (MusicI) service;
}
@Override
public void onServiceDisconnected(ComponentName name) {
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.start:
mMusicI.start();
break;
case R.id.pause_resume:
mMusicI.pause();
break;
case R.id.stop:
mMusicI.stop();
break;
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
// 监听返回键的操作
case KeyEvent.KEYCODE_BACK:
new AlertDialog.Builder(MainActivity.this)
.setTitle("设置")
.setMessage("确定需要退出吗？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
.setNeutralButton("隐藏", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
/** 隐藏到后台任务站*/
moveTaskToBack(true);
}
})
.setNegativeButton("取消", null)
.show();
break;
default:
break;
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onDestroy() {
super.onDestroy();
/** 断开绑定服务和服务的连接*/
if (conn != null) {
unbindService(conn);
conn = null;
}
}
}服务端的代码如下：
package cn.itcast.musicdemo1.service;
import cn.itcast.musicdemo1.MainActivity;
import cn.itcast.musicdemo1.dao.MusicI;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.Environment;
import android.os.IBinder;
public class BackgroundMusicService extends Service {
MyBinder mMyBinder = new MyBinder();
MediaPlayer player;
@Override
public IBinder onBind(Intent intent) {
return mMyBinder;
}
@Override
public void onCreate() {
super.onCreate();
/**
* id 通知的唯一识别 notification 通知
*/
Notification notification = new Notification(
android.R.drawable.ic_media_play, "素素播放器", //翻滚信息
System.currentTimeMillis());
Intent intent = new Intent(this, MainActivity.class);
/** PendingIntent延时意图*/
PendingIntent contentIntent = PendingIntent.getActivity(this,
100,
intent,
0);
notification.setLatestEventInfo(this,
"哈哈",
"播放器运行在后台",
contentIntent);
/** 将当前进程提升为前台进程 */
startForeground(100, notification);
player = new MediaPlayer();
player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
}
});
}
@Override
public void onDestroy() {
super.onDestroy();
// 释放硬件资源
player.release();
}
private class MyBinder extends Binder implements MusicI {
@Override
public void start() {
try {
player.reset();
player.setDataSource(Environment.getExternalStorageDirectory()
+ "/mote.mp3");
player.prepare();
player.start();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void pause() {
player.pause();
}
@Override
public void stop() {
player.stop();
}
}
}