1.SoundPool 简介
2 使用方法
1. 创建一个SoundPool
创建一个SoundPool对象：new SoundPool(int maxStreams, int streamType, int srcQuality);
public SoundPool(int maxStream, int streamType, int srcQuality)
maxStream —— 同时播放的流的最大数量
streamType —— 流的类型，一般为STREAM_MUSIC(具体在AudioManager类中列出)
srcQuality —— 采样率转化质量，当前无效果，使用0作为默认值
eg.
SoundPool soundPool = new SoundPool(3, AudioManager.STREAM_MUSIC, 0);
创建了一个最多支持3个流同时播放的，类型标记为音乐的SoundPool。
2、 从资源或者文件载入音频流： load(Context context, int resId, int priority);
soundpool的加载：
int load(Context context, int resId, int priority) //从APK资源载入
int load(FileDescriptor fd, long offset, long length, int priority) //从FileDescriptor对象载入
int load(AssetFileDescriptor afd, int priority) //从Asset对象载入
int load(String path, int priority) //从完整文件路径名载入
最后一个参数为优先级。
一般把多个声音放到HashMap中去，比如
soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100);
soundPoolMap = new HashMap<Integer, Integer>();
soundPoolMap.put(1, soundPool.load(this, R.raw.dingdong, 1));
3、 播放声音play (int soundID, float leftVolume, float rightVolume, int priority, int loop, float rate)；
play(int soundID, float leftVolume, float rightVolume, int priority, int loop, float rate) ,
其中leftVolume和rightVolume表示左右音量，
priority表示优先级,
loop表示循环次数,
rate表示速率，如 //速率最低0.5最高为2，1代表正常速度
sp.play(soundId, 1, 1, 0, 0, 1);
而停止则可以使用 pause(int streamID) 方法，这里的streamID和soundID均在构造SoundPool类的
第一个参数中指明了总数量，而id从0开始。
3. soundpool一个小应用
<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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:text="播放音效1" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/button1"
android:text="播放音效2" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:text="暂停音效1" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button3"
android:layout_below="@+id/button3"
android:text="暂停音效2" />
</RelativeLayout>
package com.example.android_sample_3_1;
import java.util.HashMap;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.provider.MediaStore.Audio;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
SoundPool sp;
HashMap<Integer, Integer> spMap;
Button b1;
Button b1Pause;
Button b2;
Button b2Pause;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initSoundPool();
b1 = (Button) findViewById(R.id.button1);
b1Pause = (Button) findViewById(R.id.button3);
b2 = (Button) findViewById(R.id.button2);
b2Pause = (Button) findViewById(R.id.button4);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
palySound(1, 1);
Toast.makeText(MainActivity.this, "播放音效1", Toast.LENGTH_SHORT).show();
}
});
b1Pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sp.pause(spMap.get(1));
Toast.makeText(MainActivity.this, "暂停音效1", Toast.LENGTH_SHORT).show();
}
});
b2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
palySound(2, 1);
Toast.makeText(MainActivity.this, "播放音效2", Toast.LENGTH_SHORT).show();
}
});
b2Pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sp.pause(spMap.get(2));
Toast.makeText(MainActivity.this, "暂停音效2", Toast.LENGTH_SHORT).show();
}
});
}
private void palySound(int sound, int number) {
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;
sp.play(spMap.get(sound), volumnRatio, volumnRatio, 1, number, 1);
}
private void initSoundPool() {
sp = new SoundPool(5, AudioManager.STREAM_MUSIC, 0);
spMap = new HashMap<Integer, Integer>();
spMap.put(1, sp.load(this, R.raw.attack02, 1));
spMap.put(2, sp.load(this, R.raw.attack14, 1));
}
@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;
}
}