android 声音播放 mediaplay soundpool

package com.example.sound;

import java.util.HashMap;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.SoundPool;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {
    Button bt1,bt2,bt3,bt4;
    TextView tv;
    MediaPlayer mp;
    SoundPool sp;
    HashMap<Integer,Integer> spm;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initSounds();                               //初始化声音          
        init();                                     //控件引用与监听
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    void init()
    {
        tv=(TextView)findViewById(R.id.textView1);
        bt1=(Button)findViewById(R.id.button1);
        bt2=(Button)findViewById(R.id.button2);
        bt3=(Button)findViewById(R.id.button3);
        bt4=(Button)findViewById(R.id.button4);
        bt1.setOnClickListener(this);
        bt2.setOnClickListener(this);
        bt3.setOnClickListener(this);
        bt4.setOnClickListener(this);
    }
    void initSounds()                       //初始化声音
    {
        mp=MediaPlayer.create(this,R.raw.futa);  //初始化MediaPlayer
        sp=new SoundPool(4,AudioManager.STREAM_MUSIC,100);
        spm=new HashMap<Integer,Integer>();
        spm.put(1,sp.load(this,R.raw.ding,1));
    }
    void playsound(int sound,int loop)     //用soundpool播放声音
    {
        AudioManager mgr=(AudioManager)this.getSystemService(Context.AUDIO_SERVICE);
        float streamVolumeCurrent=mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
        float streamVolumeMax=mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        float volume=streamVolumeCurrent/streamVolumeMax;
        sp.play(spm.get(sound),volume,volume,1,loop,1f);    //播放声音
    }

    @Override
    public void onClick(View v) {            //实现各单击事件
        // TODO Auto-generated method stub
        switch(v.getId())
        {
        case R.id.button1:
        {
            tv.setText("使用MediaPlayer播放声音");
            if(!mp.isPlaying())            //如果现在没有音乐正在播放
            {mp.start();}                  //播放音乐
            break;
        }
        case R.id.button2:
        {
            tv.setText("暂停MediaPlayer播放声音");
            if(mp.isPlaying())             //如果现在没播放音乐
            {mp.pause();}                 //停止音乐
            break;
        }
        case R.id.button3:
        {
            tv.setText("使用soundPool播放声音");
            this.playsound(1, 0);      //播放音乐
            break;
        }
        case R.id.button4:
        {
            tv.setText("暂停soundPool播放声音");
            sp.pause(1);      //暂停音乐
            break;
        }
        }
    }

}