音乐播放器

import android.Manifest;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;

public class MainActivity extends AppCompatActivity {
private Button btn1;
private Button btn2;
private Button btn3;
private Button btn4;
private static SeekBar sb;
private IService iService;
private MusicConn conn;
public static Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
Bundle bundle = msg.getData();
int duration = bundle.getInt("duration");
int position = bundle.getInt("position");
sb.setMax(duration);
sb.setProgress(position);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn4 = (Button) findViewById(R.id.btn4);
sb = (SeekBar) findViewById(R.id.sb);
//
Intent intent = new Intent(this, MusicService.class);
startService(intent);
conn = new MusicConn();
bindService(intent, conn, BIND_AUTO_CREATE);
//
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getPermissons();
iService.callPlay();
}
});
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
iService.callStop();
}
});
btn3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
iService.callPause();
}
});
btn4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
iService.callContinueMusic();
}
});
sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
iService.callSeekTo(seekBar.getProgress());
}
});
}
private void getPermissons() {
int code = ActivityCompat.checkSelfPermission(
MainActivity.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (code != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
}
//播放网络歌曲 未请求权限
//        code = ActivityCompat.checkSelfPermission(
//                MainActivity.this,
//                Manifest.permission.INTERNET);
//        if (code != PackageManager.PERMISSION_GRANTED) {
//            ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.INTERNET},1);
//        }
}

@Override
protected void onDestroy() {
unbindService(conn);
super.onDestroy();
}

class MusicConn implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
iService = (IService) service;
}

@Override
public void onServiceDisconnected(ComponentName name) {
}
}
}

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;

import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;

import static android.content.ContentValues.TAG;

public class MusicService extends Service {
private MediaPlayer mediaPlayer;
private Timer timer = null;
private TimerTask task = null;
public MusicService() {}
@Override
public void onCreate() {
//初始化mediaplayer
mediaPlayer = new MediaPlayer();
//播放结束后，取消定时器
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
task.cancel();
timer.cancel();
}
});
super.onCreate();
}

@Override
public IBinder onBind(Intent intent) {
return new MusicBinder();
}
private void play() {
try {
mediaPlayer.reset();
//播放本地音乐
//            mediaPlayer.setDataSource("/storage/emulated/0/fly.mp3");
//            mediaPlayer.prepare();

//播放网络音乐，拖放会有问题
mediaPlayer.setDataSource("http://123.56.111.226:8080/boat.mp3");
mediaPlayer.prepareAsync();
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.start();
refereshSeekBar();
}

private void refereshSeekBar() {
timer = new Timer();
task = new TimerTask() {
@Override
public void run() {
int position = mediaPlayer.getCurrentPosition();
int duration = mediaPlayer.getDuration();
Message msg = new Message();
Bundle data = new Bundle();
data.putInt("duration",duration);
data.putInt("position",position);
msg.setData(data);
MainActivity.handler.sendMessage(msg);
}
};
timer.schedule(task,100,1000);
}

public void seekTo(int position) {
mediaPlayer.seekTo(position);
}

private void stop(){
mediaPlayer.stop();
Log.i(TAG, "stop: ");
}
private void continueMusic() {
mediaPlayer.start();
}

private void pause() {
mediaPlayer.pause();
}
//------------------------------------------------------
class MusicBinder extends Binder implements IService{
@Override
public void callPlay() {
play();
}

@Override
public void callStop() {
stop();
}

@Override
public void callPause() {
pause();
}

@Override
public void callContinueMusic() {
continueMusic();
}

@Override
public void callSeekTo(int position) {
seekTo(position);
}
}

}

public interface IService {
void callPlay();
void callStop();
void callPause();
void callContinueMusic();
void callSeekTo(int position);
}