android服務之MP3播放(2)

標籤：

該播放器將會直接從網路上擷取資源進行播放，並提供進度條顯示的功能

布局檔案

 布局檔案中使用Seekbar組件來顯示進度條

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="match_parent"android:layout_height="match_parent"><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="開始播放"    android:onClick="play"/><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="暫停播放"    android:onClick="pause"/><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="繼續播放"    android:onClick="continuePlay"/><SeekBar    android:id="@+id/sb"    android:layout_width="match_parent"    android:layout_height="wrap_content" /></LinearLayout>

Activity

在Activity中需要做兩件事情，第一：從訊息佇列中擷取關於當前MP3的播放進度，通過播放進度修改SeekBar的屬性。第二：因為可以通過進度條來控制播放進度，所以擷取進度條的相關資訊來控制播放進度。

package xidian.dy.com.chujia;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.Handler;import android.os.IBinder;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.SeekBar;public class MainActivity extends AppCompatActivity {    IMusic music;    static SeekBar sb;    static Handler handler = new Handler(){        public void handleMessage(Message msg){            Bundle bundle = msg.getData();            sb.setMax(bundle.getInt("duration"));            sb.setProgress(bundle.getInt("current"));        }    };    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Intent intent = new Intent(this, MusicService.class);        startService(intent);        bindService(intent, new MyConnection(), BIND_AUTO_CREATE);        sb = (SeekBar) findViewById(R.id.sb);        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) {                music.seekTo(seekBar.getProgress());            }        });    }    public void play(View v){        music.play();    }    public void pause(View v){        music.pause();    }    public void continuePlay(View v){        music.continuePlay();    }    class MyConnection implements ServiceConnection{        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            music = (IMusic) service;        }        @Override        public void onServiceDisconnected(ComponentName name) {        }    }}

Service

在Service中需要過去當前的播放資訊，並將其寫在訊息佇列中傳遞給Activity線程。並且向外提供一個提供改變當前播放進度介面

package xidian.dy.com.chujia;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.support.annotation.Nullable;import android.util.Log;import java.io.IOException;import java.util.Timer;import java.util.TimerTask;/** * Created by dy on 2016/7/29. */public class MusicService extends Service {    MediaPlayer player;    Timer timer;    @Override    public void onCreate() {        player = new MediaPlayer();        timer = new Timer();        super.onCreate();    }    @Nullable    @Override    public IBinder onBind(Intent intent) {        return new MyBinder();    }    public void continuePlay(){        player.start();    }    public void pause(){        player.pause();    }    public void play(){        player.reset();        try {            player.setDataSource("http://123.206.68.138/mg.mp3");            player.prepareAsync();            player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {                @Override                public void onPrepared(MediaPlayer mp) {                    mp.start();                    timer.schedule(new TimerTask() {                        @Override                        public void run() {                            Bundle bundle = new Bundle();                            bundle.putInt("duration", player.getDuration());                            bundle.putInt("current", player.getCurrentPosition());                            Message msg = MainActivity.handler.obtainMessage();                            msg.setData(bundle);                            MainActivity.handler.sendMessage(msg);                            Log.i("duration", String.valueOf(player.getDuration()));                        }                    }, 5, 500);                }            });        } catch (IOException e) {            e.printStackTrace();        }    }    @Override    public void onDestroy() {        super.onDestroy();        player.stop();        player.release();        timer.cancel();    }    class MyBinder extends Binder implements IMusic{        @Override        public void play() {            MusicService.this.play();        }        @Override        public void pause() {            MusicService.this.pause();        }        public void seekTo(int msc){            player.seekTo(msc);        }        @Override        public void continuePlay() {            MusicService.this.continuePlay();        }    }}

介面

該介面是串連service和Activity的

package xidian.dy.com.chujia;/** * Created by dy on 2016/7/29. */public interface IMusic {    void play();    void pause();    void continuePlay();    void seekTo(int msc);}

資訊清單檔

 在資訊清單檔中需要開啟網路許可權

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="xidian.dy.com.chujia"><uses-permission android:name="android.permission.INTERNET"/><application    android:allowBackup="true"    android:icon="@mipmap/ic_launcher"    android:label="@string/app_name"    android:supportsRtl="true"    android:theme="@style/AppTheme">    <activity        android:name=".MainActivity"        android:label="主介面">        <intent-filter>            <action android:name="android.intent.action.MAIN" />            <category android:name="android.intent.category.LAUNCHER" />        </intent-filter>    </activity>    <service android:name=".MusicService"/></application></manifest>

 

android服務之MP3播放(2)