bindService 实现音乐播放的功能

1：需要Activity实现ServiceConnection的接口

2：需要Service 提供一个继承了Binder的类来提供内部的方法。

3：进度条的设置

4：注册清单文件

public class MyActivity extends Activity implements ServiceConnection,Runnable {
    private Thread thread;
    private TextView textView;
    private Handler handler;
    private boolean flag;
    private ProgressBar progressBar;
    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Intent service = new Intent(this, PlayService.class);
        bindService(service,this,BIND_AUTO_CREATE);
        textView = (TextView)findViewById(R.id.main_progress_textView);
        progressBar = (ProgressBar)findViewById(R.id.main_progressbar);
        thread = new Thread(this);
        handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                int position =msg.arg1;
                int total = msg.arg2;
                textView.setText(""+position+total);
            }
        };
        thread.start();
    }

    public void run(){
        while(true){
            try {
                Thread.sleep(1000);
                if(flag!=false) {
                    int postion = controller.getCurrentPosition();
                    int total = controller.getDuration();
//                    textView.setText(postion);
                    Message msg = new Message();
                    msg.arg1=postion;
                    msg.arg2=total;
                    handler.sendMessage(msg);
                    progressBar.setProgress(postion);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }


    private PlayService.Controller controller;
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        if(PlayService.class.getName().equals(componentName.getClassName())){
            controller = (PlayService.Controller)iBinder;
            progressBar.setMax(controller.getDuration());
            Log.d("151217MY", "Connected");
        }
    }
    public void btnPlay(View view) {
        if(progressBar.getVisibility()==ProgressBar.INVISIBLE){
            progressBar.setVisibility(ProgressBar.VISIBLE);
        }
        controller.play();
        flag=true;
    }

    public void btnPause(View view) {
        controller.pause();
        flag=false;
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {

    }
}

public class PlayService extends Service{
    private MediaPlayer player;
    @Override
    public IBinder onBind(Intent intent) {
        return new Controller();
    }
    public class Controller extends Binder{
        public void play(){
            player.start();
        }
        public void pause(){
            player.pause();
        }

        public int getCurrentPosition(){
            return player.getCurrentPosition();
        }

        public int getDuration(){
            return player.getDuration();
        }
    }
    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.nobody);
    }

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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >

    <TextView
            android:id="@+id/main_progress_textView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="progress_textView"
            />
    <ProgressBar
            android:id="@+id/main_progressbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            style="@android:style/Widget.ProgressBar.Horizontal"
            android:visibility="invisible"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="btnPlay"
        android:text="Play"
        />
    <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="btnPause"
            android:text="Pause"
            />
</LinearLayout>

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.zqxue.HomeWork151216"
          android:versionCode="1"
          android:versionName="1.0"
        >
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <uses-sdk android:minSdkVersion="15"/>
    <application
            android:label="@string/app_name"
            android:icon="@drawable/ic_launcher"
            >
        <activity
                android:name="MyActivity"
                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=".service.PlayService"/>
        <receiver android:name=".receiver.PlayerBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>
        <service android:name=".service.StartService"/>

    </application>
</manifest>