android之MP3播放器

標籤：

布局檔案

布局檔案中設定了三個按鈕分別來進行播放、暫停和繼續播放

<?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"/></LinearLayout>

Activity

在Activity中開啟服務， 在服務中實現MP3的播放功能，然後通過一個Binder對象將該功能暴露給Activity。則可以在Activity中調用Service中的方法。

package xidian.dy.com.chujia;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.support.v7.app.AppCompatActivity;import android.view.View;public class MainActivity extends AppCompatActivity {    IMusic music;    @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);    }    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中建立一個MediaPlayer來控制音樂播放

package xidian.dy.com.chujia;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Binder;import android.os.IBinder;import android.support.annotation.Nullable;import java.io.IOException;/** * Created by dy on 2016/7/29. */public class MusicService extends Service {    MediaPlayer player;    @Override    public void onCreate() {        player = new MediaPlayer();        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("/sdcard/bc.mp3");            player.prepare();            player.start();        } catch (IOException e) {            e.printStackTrace();        }    }    @Override    public void onDestroy() {        super.onDestroy();        player.stop();        player.release();    }    class MyBinder extends Binder implements IMusic{        @Override        public void play() {            MusicService.this.play();        }        @Override        public void pause() {            MusicService.this.pause();        }        @Override        public void continuePlay() {            MusicService.this.continuePlay();        }    }}

IMusic

IMusic是一個介面類，主要是為了能在Activity中調用service中的方法。

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

資訊清單檔

在資訊清單檔中需要對服務進行註冊

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="xidian.dy.com.chujia"><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之MP3播放器