android SoundPool 及 MediaPlayer 声音播放

package com.free.study;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.SoundPool;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class StudyAndroidActivity extends Activity {
    
    Button btn1;
    Button btn2;
    
    SoundPool soundPool;
    HashMap<Integer, Integer> soundMap ; 
    float leftVolume =1.0f, rightVolume =1.0f;
    int priority =1, loop = 0;
    float rate =1.0f;//正常速率
    
    
    Button btn3;
    Button btn4;
    
    MediaPlayer mediaPlayer;
    
    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        btn1 = (Button)findViewById(R.id.button1);
        btn2 = (Button)findViewById(R.id.button2);
        
        soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
        
        soundMap = new HashMap<Integer, Integer>();
        
        soundMap.put(1, soundPool.load(this, R.raw.aaa, 1)); 
        
        AssetFileDescriptor descriptor;
        try {
            descriptor = this.getResources().getAssets().openFd("abc.wav");
            soundMap.put(2, soundPool.load(descriptor, 1 )); 
        } catch (IOException e) {
            e.printStackTrace();
        }  
         
        btn1.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                playSound(1);
            }
        });
        
        btn2.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                playSound(2);
            }
        });
        
        
        
        
        
        btn3 = (Button)findViewById(R.id.button3);
        btn4 = (Button)findViewById(R.id.button4);
        
        btn3.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                playMedia(3);
            }
        });
        
        btn4.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                playMedia(4);
            }
        });
        
    }

        private void playSound(int soundID){
        
//        AudioManager am = (AudioManager)this.getSystemService(this.AUDIO_SERVICE);
//        float audioMaxVolumn = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
//        float audioCurrentVolumn = am.getStreamVolume(AudioManager.STREAM_MUSIC);
//        float volumnRatio = audioCurrentVolumn/audioMaxVolumn;

            int streamID =soundPool.play(soundMap.get(soundID), leftVolume, rightVolume, priority, loop, rate);
            if(streamID == 0){
                //播放失败
                Toast.makeText(this, "fail", Toast.LENGTH_SHORT).show();
            }else{
                //播放成功
                Toast.makeText(this, "ok", Toast.LENGTH_SHORT).show();
            }
    }
    
    
    private void playMedia(int soundID){
        if(mediaPlayer!=null){
            mediaPlayer.stop();                
            mediaPlayer.reset();
        }
        
        if(soundID == 3){
            mediaPlayer = MediaPlayer.create(this,
                R.raw.aaa);
            mediaPlayer.start();
        }
        else if(soundID == 4){
            try {
                AssetManager assetManager = this.getAssets();
                AssetFileDescriptor fileDesc = assetManager.openFd("abc.wav");
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setDataSource(fileDesc.getFileDescriptor(),
                        fileDesc.getStartOffset(),
                        fileDesc.getLength()
                        );
                mediaPlayer.prepare();
                mediaPlayer.start();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        

    }
    
    //TODO 资源释放
    
    
}