Android用SoundPool播放音效

package cn.wuxiaocheng.soundpool; import android.content.res.AssetManager; import android.media.AudioAttributes; import android.media.AudioManager; import android.media.SoundPool; import android.os.Build; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import java.util.HashMap; public class MainActivity extends AppCompatActivity implements OnClickListener { private Button btn_play1; private Button btn_play2; private Button btn_release; private AssetManager aManager; private SoundPool mSoundPool = null; private HashMap<Integer, Integer> soundID = new HashMap<Integer, Integer>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); aManager = getAssets(); try { initSP(); } catch (Exception e) { e.printStackTrace(); } bindViews(); } private void bindViews() { btn_play1 = (Button) findViewById(R.id.rawPlay); btn_play2 = (Button) findViewById(R.id.assetsPlay); btn_release = (Button) findViewById(R.id.btn_release); btn_play1.setOnClickListener(this); btn_play2.setOnClickListener(this); btn_release.setOnClickListener(this); } private void initSP() throws Exception { //当前系统的SDK版本大于等于21(Android 5.0)时 if (Build.VERSION.SDK_INT >= 21) { SoundPool.Builder builder = new SoundPool.Builder(); //传入音频数量 builder.setMaxStreams(2); //AudioAttributes是一个封装音频各种属性的方法 AudioAttributes.Builder attrBuilder = new AudioAttributes.Builder(); //设置音频流的合适的属性 attrBuilder.setLegacyStreamType(AudioManager.STREAM_MUSIC); //加载一个AudioAttributes builder.setAudioAttributes(attrBuilder.build()); mSoundPool = builder.build(); } //当系统的SDK版本小于21时 else {//设置最多可容纳2个音频流，音频的品质为5 mSoundPool = new SoundPool(2, AudioManager.STREAM_SYSTEM, 5); } soundID.put(1, mSoundPool.load(this, R.raw.raw, 1)); soundID.put(2, mSoundPool.load(getAssets().openFd("assets.mp3"), 1)); //需要捕获IO异常 } @Override public void onClick(View v) { switch (v.getId()) { case R.id.rawPlay: mSoundPool.play(soundID.get(1), 1, 1, 0, 0, 1); break; case R.id.assetsPlay: mSoundPool.play(soundID.get(2), 1, 1, 0, 0, 1); break; case R.id.btn_release: //回收SoundPool资源 mSoundPool.release(); break; } } }