Android简单实现音乐播放器

Android老师的小作业。让使用Android的service实现音乐播放器。话不多说，直接上代码

首先你要有一个主MainActivity

package com.example.musicplayer;

import org.w3c.dom.Text;

import android.app.Activity;
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.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Toast;

import com.example.musicplayer.MusicSevice.MyBinder;

public class MainActivity extends Activity implements OnClickListener {

	
	
	private EditText path;
	private Intent intent;
	private myConn conn;
	MyBinder binder;
	private SeekBar mSeekBar;
	private Thread mThread;
	private Handler handler=new Handler(){
		public void handleMessage(android.os.Message msg){
			switch(msg.what){
			
			case 100:
				int currentPosition=(Integer) msg.obj;
				mSeekBar.setProgress(currentPosition);
				break;
				
			default:
				break;
			}
		}
	};
	

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        path=(EditText) findViewById(R.id.et_inputpath);
        findViewById(R.id.bt_play).setOnClickListener(this);
        findViewById(R.id.bt_pause).setOnClickListener(this);
        findViewById(R.id.bt_replay).setOnClickListener(this);
        findViewById(R.id.bt_stop).setOnClickListener(this);
        mSeekBar=(SeekBar) findViewById(R.id.seekBar1);
        conn=new myConn();
        intent=new Intent(this,MusicSevice.class);
        bindService(intent, conn, BIND_AUTO_CREATE);
        
        
    }
    
    
    //初始化进度条长度,获取音乐文件长度
    private void initSeekBar(){
    	int musicWidth=binder.getMusicWidth();
    	mSeekBar.setMax(musicWidth);
    }
    
    //更新音乐播放进度
    private void updateProgress(){
    	mThread=new Thread(){
    		public void run(){
    			while(!interrupted()){
    				//调用服务中的获取当前播放进度
    				int currentPosition =binder.getCurrentPosition();
    				Message message=Message.obtain();
    				message.obj=currentPosition;
    				message.what=100;
    				handler.sendMessage(message);
    			}
    		}
    	};
    	mThread.start();
    }
    
    private class myConn implements ServiceConnection{

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			binder=(MyBinder) service;
		}

		@Override
		public void onServiceDisconnected(ComponentName arg0) {
			// TODO Auto-generated method stub
			
		}
    	
    }
    

	@Override
	public void onClick(View v) {

		String pathway=path.getText().toString().trim();
		String path="data/data/com.example.musicplayer/1.mp3";
		switch (v.getId()) {
		case R.id.bt_play:
			if(!TextUtils.isEmpty(path)){
				binder.palys(path);
				initSeekBar();
				updateProgress();
			}else{
				Toast.makeText(this, "找不到音乐文件", 0).show();
			}
			break;
		case R.id.bt_pause:
			binder.pauses();
			break;
		case R.id.bt_replay:
			binder.repalys(pathway);
			break;
		case R.id.bt_stop:
			mThread.interrupt();
			if(mThread.isInterrupted()){
				binder.stops();
			}
		default:
			break;
		}
	}
    protected void onDestory(){
    	if(mThread!=null){
    		if(!mThread.isInterrupted()){
    			mThread.interrupt();
    		}
    	}
    	unbindService(conn);
    	super.onDestroy();
    }
}

然后你要有一个service，叫MusicService，

package com.example.musicplayer;

import android.annotation.SuppressLint;
import android.app.Service;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MusicSevice extends Service{
	private static final String TAG="MusicService";
	public MediaPlayer mediaPlayer;
	class MyBinder extends Binder{
		public void palys(String path){
			play(path);
		}
		public void pauses(){
			pause();
		}
		public void repalys(String path){
			replay(path);
		}
		public void stops(){
			stop();
			
		}public int getCurrentPosition(){
				return getCurrenProgress();
		}
		public int getMusicWidth(){
			return getMusicLength();
		}
		
	}
	
	
	public void onCreate(){
		super.onCreate();
	}
	
	
	@SuppressLint("NewApi")
	private void play(String path) {
		
		try{
			if(mediaPlayer == null){
				Log.i(TAG,"开始播放音乐");
				//创建一个MediaPlayer播放器
				mediaPlayer=new MediaPlayer();
				//指定参数为音频文件
				mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
				//指定播放路径
				mediaPlayer.setDataSource(path);
				//准备播放
				mediaPlayer.prepare();
				mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
					
					@Override
					public void onPrepared(MediaPlayer mp) {
						mediaPlayer.start();
					}
				});
			}else{
				int position =getCurrenProgress();
				mediaPlayer.seekTo(position);
				try{
					mediaPlayer.prepare();
				}catch(Exception e){
					e.printStackTrace();
				}
				mediaPlayer.start();
			}
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	//暂停音乐
	public void pause(){
		if(mediaPlayer != null && mediaPlayer.isPlaying()){
			Log.i(TAG, "暂停播放");
			mediaPlayer.pause();
		}else if(mediaPlayer !=null && (!mediaPlayer.isPlaying())){
			mediaPlayer.start();
		}
	}
	
	//重新播放
	public void replay(String path){
		if(mediaPlayer!=null){
			Log.i(TAG, "重新开始播放");
			mediaPlayer.seekTo(0);
			try{
				mediaPlayer.prepare();
			}catch(Exception e){
				e.printStackTrace();
			}
			mediaPlayer.start();
		}
	}
	
	//停止播放
	public void stop() {
		if(mediaPlayer != null){
			Log.i(TAG, "停止播放");
			mediaPlayer.stop();
			mediaPlayer.release();
			mediaPlayer=null;
		}else{
			Toast.makeText(getApplicationContext(), "已停止", 0).show();
		}
		
	}
	
	
	
	//获取文件资源长度
	public int getMusicLength(){
		if(mediaPlayer != null){
			return mediaPlayer.getDuration();
		}
		return 0;
	}
	//获取当前进度
	public int getCurrenProgress(){
		try{
			if(mediaPlayer !=null){
				if(mediaPlayer.isPlaying()){
					Log.i(TAG, "获取当前进度");
					return mediaPlayer.getCurrentPosition();
				}else if(!mediaPlayer.isPlaying()){
					return mediaPlayer.getCurrentPosition();
				}
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		return 0;
	}
	
	
	
	public void onDestroy(){
		if(mediaPlayer !=null){
			mediaPlayer.stop();
			mediaPlayer.release();
			mediaPlayer=null;
		}
		super.onDestroy();
	}
	

	@Override
	public IBinder onBind(Intent arg0) {
		return new MyBinder();
	}

}

当然，你至少要有一个主样式文件，activity_main.xml，

下面的1.mp3文件是要播放的音乐文件，自己搞定哦

最后别忘了注册你的activity和service，注册文件如下

当然还有可能因为Android sdk版本的问题出现点小毛病，这里推荐使用Android 19

 

 

 

 

 

 

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