安卓：bindService播放指定音乐

来源：互联网发布：简单力学分析软件编辑：程序博客网时间：2024/06/03 21:32

raw为自个建的

清单文件中注册服务

逻辑代码文件：

<span style="font-size:18px;">package com.example.day22_music;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.view.View;import com.example.day22_music.MusicService.MyBind;public class MainActivity extends Activity {MusicService musicService;MyConn conn=new MyConn();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        }    public void click(View v)    {    switch(v.getId())    {    case R.id.bt1:    if(musicService==null)    {    Intent intent=new Intent(MainActivity.this,MusicService.class);    bindService(intent, conn, Context.BIND_AUTO_CREATE);    }    else    {    musicService.play();    }    break;    case R.id.bt2:    if(musicService!=null)    {    musicService.pause();    }    break;    case R.id.bt3:    if(musicService!=null)    {    musicService.stop();    musicService=null;    unbindService(conn);    }    break;    }    }    class MyConn implements ServiceConnection    {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {MyBind mb= (MyBind) service;musicService=mb.getService();}@Overridepublic void onServiceDisconnected(ComponentName name) {conn=null;}        }}</span>

服务类文件：

<span style="font-size:18px;">package com.example.day22_music;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Binder;import android.os.IBinder;public class MusicService extends Service{MediaPlayer mediaPlayer;//声明操作媒体的对象int pos=0;//记录播放的位置@Overridepublic IBinder onBind(Intent intent) {play();//绑定时进行播放return new MyBind();}class MyBind extends Binder{public MusicService getService(){return MusicService.this;}}@Overridepublic void onCreate() {super.onCreate();if(mediaPlayer==null){mediaPlayer=mediaPlayer.create(MusicService.this, R.raw.heavencity);mediaPlayer.setLooping(false);//设置不需要单曲循环}//播放完毕 进行监听回调mediaPlayer.setOnCompletionListener(new OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {mediaPlayer.release();//释放资源}});}public void play(){if(mediaPlayer!=null&&!mediaPlayer.isPlaying()){try {if(pos!=0){//根据指定位置进行播放mediaPlayer.seekTo(pos);mediaPlayer.start();}else{//从头播放mediaPlayer.stop();mediaPlayer.prepare();//启动之前必须preparemediaPlayer.start();}} catch (Exception e){e.printStackTrace();}}else{}}public void pause(){if(mediaPlayer!=null&&mediaPlayer.isPlaying()){pos=mediaPlayer.getCurrentPosition();mediaPlayer.pause();}}public void stop(){if(mediaPlayer!=null){mediaPlayer.stop();mediaPlayer.reset();}}}</span>

布局文件：

<span style="font-size:18px;"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView         android:id="@+id/tv"        android:layout_width="match_parent"        android:layout_height="150dp"        android:gravity="center"        android:background="#00ff00"/>    <LinearLayout         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <Button        android:id="@+id/bt1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="播放音乐"         android:onClick="click"/>    <Button        android:id="@+id/bt2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="暂停音乐"         android:onClick="click"/>    <Button        android:id="@+id/bt3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="停止音乐"         android:onClick="click"/>    </LinearLayout>    </LinearLayout></span>

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