Android OpenGL 2.1 即时音效

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MainActivity.java

package com.fisnail;import java.util.HashMap;import android.app.Activity;import android.content.Context;import android.media.AudioManager;import android.media.SoundPool;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;/** *  * @author 粪豆的蜗牛(fisnail@163.com) *  */public class MainActivity extends Activity {/** * 播放按钮 */private Button btn_id_play;/** * 停止按钮 */private Button btn_id_stop;/** * 声明SoundPool引用 */private SoundPool soundPool;/** * 用于存放声音文件的Map */private HashMap<Integer, Integer> hashMap;/** * 当前播放的音频id */private int currentStreamId;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn_id_play = (Button) findViewById(R.id.btn_main_play);btn_id_stop = (Button) findViewById(R.id.btn_main_stop);initSoundPool();btn_id_play.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubplaySound(1, 0);Toast.makeText(getBaseContext(), "开始播放音效", Toast.LENGTH_SHORT).show();}});btn_id_stop.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubsoundPool.stop(currentStreamId);Toast.makeText(getBaseContext(), "停止播放音效",Toast.LENGTH_SHORT).show();}});}private void initSoundPool() {/** * 创建SoundPool对象 public SoundPool (int maxStreams,  * int streamType, int srcQuality)  * maxStreams：该参数用于设置最多同时能够播放多少个音效 * streamType：该参数设置音频类型，在游戏中通常设置为STREAM_MUSIC * srcQuality：该参数设置音频文件的质量，目前还不知具体作用，默认设置为0 */soundPool = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);hashMap = new HashMap<Integer, Integer>();/** * 加载音频文件 public int load (Context context, int resId, *  int priority) * context：应用程序上下文 resId：资源id【由于SoundPool设计的初衷是用于无延时的 * 播放游戏中的短促音效， * 因此实际开发中应该只将长度小于7s的声音资源放进SoundPool，否则可能加载失败或者内存 * 占用过大】 priority：优先级 */hashMap.put(1, soundPool.load(this, R.raw.test, 1));}private void playSound(int sound, int loop) {AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);float streamVolumeCurrent = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);// 获取当前音量float streamVolumeMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);// 获取系统最大音量float volume = streamVolumeCurrent / streamVolumeMax;// 计算得到播放音量/** * 播放音效 public final int play (int soundID, float leftVolume, *  float rightVolume, int priority, int loop, float rate) *  soundID：播放音效的id * leftVolume：左声道音量 rightVolume:右声道音量 priority：优先级0最低  * loop：循环 0不循环 -1 * 永远循环 rate：播放速度 0.5~2.0f 1.0f为正常速度 */currentStreamId = soundPool.play(hashMap.get(sound), volume, volume, 1,loop, 1.0f);}}

?activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    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"    tools:context=".MainActivity" >    <!-- Title -->    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/tv_main_title"        android:text="@string/tv_main_title"        android:layout_centerHorizontal="true"        />    <!--播放按钮 -->    <Button android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btn_main_play"        android:text="@string/btn_main_play_text"        android:layout_below="@id/tv_main_title"/>    <!--停止按钮  -->    <Button android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btn_main_stop"        android:text="@string/btn_main_stop_text"        android:layout_below="@id/btn_main_play"/></RelativeLayout>

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?strings.xml

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<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">即时音效</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>            <!--MainActivity  -->        <!--标题Title  -->    <string name="tv_main_title">即时音效</string>    <!--播放按钮  -->    <string name="btn_main_play_text">播放音效</string>    <!--停止按钮  -->    <string name="btn_main_stop_text">停止播放</string></resources>

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