Android 中MediaPlayer播放音频

1、播放/res/raw/目录下的音频资源

public class MainActivity extends Activity {

    MediaPlayer mediaPlayer;
    int position = 0;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
            
    }

    public void start(View v) {
        try {
            mediaPlayer = MediaPlayer.create(this, R.raw.mus);
            if (mediaPlayer != null ) {
                mediaPlayer.stop(); 
                position = 0;
            }
            mediaPlayer.prepare();
            if (position > 0) mediaPlayer.seekTo(position);
            mediaPlayer.start();        
        }catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    
    public void stop(View v) {
        mediaPlayer.stop();
    }

    public void pause(View v) {
        position = mediaPlayer.getCurrentPosition();
        mediaPlayer.pause();
    }
    
    @Override
    protected void onDestroy() {
        mediaPlayer.release();
        super.onDestroy();
    }

}

2、播放 assets目录下的音频资源

package com.test.mediaplayer;

import java.io.IOException;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

    MediaPlayer mediaPlayer;
    int position = 0;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);        
    }

    public void start(View v) {        
        try {
            mediaPlayer = new MediaPlayer();
            AssetManager am = getAssets();
            AssetFileDescriptor afd = am.openFd("mus.mp3");
            mediaPlayer.setDataSource(afd.getFileDescriptor());
            mediaPlayer.prepare();
            if (position > 0) mediaPlayer.seekTo(position);
            mediaPlayer.start();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public void stop(View v) {
        mediaPlayer.stop();
    }

    public void pause(View v) {
        position = mediaPlayer.getCurrentPosition();
        mediaPlayer.pause();
    }
    
    @Override
    protected void onDestroy() {
        mediaPlayer.release();
        super.onDestroy();
    }

}

3、播放sdCard上的音频资源

package com.test.mediaplayer;

import java.io.IOException;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

    MediaPlayer mediaPlayer;
    int position = 0;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);        
    }

    public void start(View v) {        
        try {
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setDataSource("/mnt/sdcard/mus.mp3");
            mediaPlayer.prepare();
            if (position > 0) mediaPlayer.seekTo(position);
            mediaPlayer.start();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public void stop(View v) {
        mediaPlayer.stop();
    }

    public void pause(View v) {
        position = mediaPlayer.getCurrentPosition();
        mediaPlayer.pause();
    }
    
    @Override
    protected void onDestroy() {
        mediaPlayer.release();
        super.onDestroy();
    }

}

4、播放网络音频资源使用 MediaPlayer的setDataSource(Context context, Uri uri)方法，Uri为音频文件的网络路径。

使用SoundPool来播放密集、短促的音效。MediaPlayer的缺点是：资源占用量高、延迟时间长，不支持多个音频同时播放，SoundPool虽然可以一次性加载多个声音，但是由于内存限制，因此应该避免使用SoundPool来播放歌曲或者做游戏背景。