Android利用SoundPool实现音乐池

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_sound_pool"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingbottom="@dimen/activity_vertical_margin"
    android:paddingleft="@dimen/activity_horizontal_margin"
    android:paddingright="@dimen/activity_horizontal_margin"
    android:paddingtop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.g150825_android26.soundpoolactivity">

    <button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="音效鸡"
        android:onclick="playkfc"
        />
    <button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="音效two"
        android:onclick="playtwo"
        />
    <button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="音效three"
        android:onclick="playthree"
        />
    <button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="音效four"
        android:onclick="playfour"
        />
    <button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="音效狗"
        android:onclick="playdog"
        />

</linearlayout>

package com.example.g150825_android26;

import android.app.alarmmanager;
import android.media.audiomanager;
import android.media.soundpool;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;

public class soundpoolactivity extends appcompatactivity {

    private soundpool soundpool;

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_sound_pool);
        soundpool = new soundpool(4, audiomanager.stream_music,0);

        soundpool.setonloadcompletelistener(new soundpool.onloadcompletelistener() {
            @override
            public void onloadcomplete(soundpool soundpool, int i, int i1) {
                soundpool.play(i,1,1,1,-1,1);
            }
        });
    }
    public void playkfc(view view){
        soundpool.load(this,r.raw.rooster,1);
    }
    public void playtwo(view view){
        soundpool.load(this,r.raw.chimp,1);

    }
    public void playthree(view view){
        soundpool.load(this,r.raw.crickets,1);
    }
    public void playfour(view view){
        soundpool.load(this,r.raw.roar,1);
    }
    public void playdog(view view){
        soundpool.load(this,r.raw.dogbark,1);
    }

    @override
    protected void ondestroy() {
        super.ondestroy();
        if (soundpool!=null){
            soundpool.release();
            soundpool=null;
        }
    }
}