9

AudioTrack クラスを試しています。基本的に、私のアプリは、ユーザーが画面上の特定のオブジェクトに触れたときに音を生成する必要があります。この例をガイドとして使用しました。
私のアプリは正常に動作しているようですが、通常、約 1 分間画面に触れた後にクラッシュします。

07-02 20:40:53.459: E/AndroidRuntime(11973): FATAL EXCEPTION: Thread-10
07-02 20:40:53.459: E/AndroidRuntime(11973): java.lang.IllegalStateException: play() called on uninitialized AudioTrack.
07-02 20:40:53.459: E/AndroidRuntime(11973):    at android.media.AudioTrack.play(AudioTrack.java:824)
07-02 20:40:53.459: E/AndroidRuntime(11973):    at com.mysounds_experimental.SoundThread.playSound(SoundThread.java:108)
07-02 20:40:53.459: E/AndroidRuntime(11973):    at com.mysounds_experimental.SoundThread.run(SoundThread.java:69)

音を生成するクラスのメソッド

public void initAudioTrack() {
        int bufferSize = AudioTrack.getMinBufferSize(sampleRate
                , AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);

        audioTrack = new AudioTrack(
                AudioManager.STREAM_MUSIC
                , sampleRate
                , AudioFormat.CHANNEL_CONFIGURATION_MONO
                , AudioFormat.ENCODING_PCM_16BIT
                , bufferSize
                , AudioTrack.MODE_STREAM);
    }

   private void playSound(){
            audioTrack.write(generatedSnd, 0, numSamples);
            audioTrack.play();
        }

public void stopPlaying() {
    audioTrack.flush();
    audioTrack.stop(); 
    audioTrack.release();
}

@Override
    public void run() {
        while (mRun) {
            try{
                Thread.sleep(200);
                while(soundCycle){
                    if(freqOfTone != -1f) {
                        generateTone();
                        playSound();
                        Thread.sleep(200);
                    }
                }
            } catch(InterruptedException e){
                //              soundCycle = false;
                //              soundPool.stop(BEEP);
            }
        }
    }

これは、私のスレッドが使用されているカスタムビューからのメソッドです

@Override
    public boolean onTouchEvent(final MotionEvent ev) {
        int currentXPosition = (int) ev.getX();
        int currentYPosition = (int) ev.getY();

        if(ev.getX() < smBitmap.getWidth())
            if(ev.getY() < smBitmap.getHeight()){
                tempCol = smBitmap.getPixel(currentXPosition, currentYPosition);
            }

        final int action = ev.getAction();

        switch (action & MotionEvent.ACTION_MASK) {

        case MotionEvent.ACTION_DOWN: {

            sThread.freqOfTone = getFreqPreset(tempCol);
            if(col != tempCol){
//              sThread.initAudioTrack();
                sThread.interrupt();
                if(shouldInit) {
                   shouldInit = false;
                   sThread.initAudioTrack();
                }
                sThread.soundCycle = true;
                col = tempCol; 
                invalidate();
            }
            break;
        }

        case MotionEvent.ACTION_MOVE: {
            sThread.freqOfTone = getFreqPreset(tempCol);

            if (tempCol == -1 || tempCol == 0) {
                sThread.soundCycle = false;
                shouldInit = true;
//              sThread.stopPlaying();
                sThread.interrupt();
                invalidate();
            } else {
                if(col != tempCol){
                    sThread.interrupt();
                    col = tempCol;
                    invalidate();
                }else {
                    sThread.soundCycle = true;
                    col = tempCol;
                    invalidate();
                }
            }
            break;
        }// case ACTION_MOVE

        case MotionEvent.ACTION_UP: {
            sThread.soundCycle = false;
            shouldInit = true;
//          sThread.stopPlaying();
            sThread.interrupt();
            col = -1;
            mActivePointerId = INVALID_POINTER_ID;
            break;
        }// case ACTION_UP

        }   

        return true;
    }

なぜこれが起こっているのですか？

4

2 に答える 2

4

stopPlaying() メソッドをコメントアウトしたのはなぜですか?

作成できる AudioTrack は 32 個までです。さらに必要な場合は、 release() メソッドを呼び出す必要があります。

于 2013-06-15T09:47:23.433 に答える
1

I would think that you need to call play() before you call write().

But I've also noticed that when you create lots of AudioTrack instances even if you think you're cleaning everything up write, sometimes a play() fails to work, and the track is uninitialized.

You will want to try...catch this IllegalStateException, and avoiding calling write() until play() works without throwing an exception.

于 2012-09-12T02:17:00.773 に答える