android多媒體——4步學會SoundPool

標籤：android   多媒體   soundpool   

之前學習過了MediaPlayer用於播放手機音樂，但是在手機中很多的提示音並不是使用MediaPlayer來播放的比如簡訊鈴聲，通知鈴聲，android中使用SoundPool來播放小的音頻檔案；

下面一起學習SoundPool的使用
【1】先搭介面設定一個按鈕用於播放開始

【2】得到SoundPool

查看API，得知要得到SoundPool根據版本不同有兩種方式
21版本以前使用
SoundPool pool =new SoundPool(int maxStreams, int streamType, int srcQuality)

21版本之後：使用Builder來產生

【3】調用load方法載入音頻

【4】調用play方法
public final int play (int soundID, float leftVolume, float rightVolume, int priority, int loop, float rate)

參數介紹
Parameters
soundID a soundID returned by the load() function
leftVolume left volume value (range = 0.0 to 1.0)左聲道
rightVolume right volume value (range = 0.0 to 1.0)右聲道
priority stream priority (0 = lowest priority)優先順序
loop loop mode (0 = no loop, -1 = loop forever)迴圈與否
rate playback rate (1.0 = normal playback, range 0.5 to 2.0)播放返回的速度

注意事項

如果你的沒有聲音，那是因為載入音頻需要時間，不要把load和play放在一起
也不要使線程休眠，以免阻礙主線程

下面是源碼

public class MainActivity extends Activity {    private Button mButton;    private SoundPool pool = null;    private int id;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button_sound);        //必須放在外面因為載入音頻需要時間不然會沒有聲音        id= initSound();        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                playSound();            }        });    }    private void playSound() {        //public final int play (int soundID, float leftVolume, float rightVolume, int priority, int loop, float rate)//         Parameters//                soundID   a soundID returned by the load() function//                leftVolume    left volume value (range = 0.0 to 1.0)左聲道//                rightVolume   right volume value (range = 0.0 to 1.0)右聲道//                priority  stream priority (0 = lowest priority)優先順序//                loop  loop mode (0 = no loop, -1 = loop forever)迴圈與否//                rate  playback rate (1.0 = normal playback, range 0.5 to 2.0)播放返回的速度        pool.play(id, 1, 1, 0, -1, 1);    }    public int initSound() {        if (Build.VERSION.SDK_INT > 21) {            SoundPool.Builder builder = new SoundPool.Builder();            builder.setMaxStreams(2);            AudioAttributes.Builder builder1 = new AudioAttributes.Builder();            builder1.setLegacyStreamType(AudioManager.STREAM_MUSIC);            builder.setAudioAttributes(builder1.build());            pool = builder.build();        } else {            //21版本以前使用SoundPool(int maxStreams, int streamType, int srcQuality)            pool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);        }        return  pool.load(getApplicationContext(), R.raw.outgoing, 1);    }}

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android多媒體——4步學會SoundPool