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語氣我有我需要顯示撥號盤，如屏幕的要求，我不得不產生1kHz的音（不DTMF音），只要在撥號盤上的按鈕用戶按下。未初始化AudioTrack例外，當我嘗試生成的第22次
我用的代碼從下面的鏈接，產生1 kHz音調：
Playing an arbitrary tone with Android
當我開始我的撥號盤屏幕上的撥號按鈕，直到21按下它成功地產生基調，但後22日嘗試我我得到了應用程序不響應（ANR）錯誤，我需要關閉應用程序。
下面是我的代碼：
final float duration = 0.3f; // seconds
final int sampleRate = 4000;
final int numSamples = (int)duration * sampleRate + 100;
final double sample[] = new double[numSamples];
final double freqOfTone = 1000; // hz
final byte generatedSnd[] = new byte[2 * numSamples];
final Handler handler = new Handler();
public void onClick(View v) {
// TODO Auto-generated method stub
int id = v.getId();
playSound();
}
private void playSound()
{
final Thread thread = new Thread(new Runnable() {
public void run() {
genTone();
handler.post(new Runnable() {
public void run() {
playSound1();
}
});
}
});
thread.start();
}
void playSound1(){
final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, numSamples,
AudioTrack.MODE_STATIC);
audioTrack.write(generatedSnd, 0, generatedSnd.length);
audioTrack.play();
}
void genTone(){
// fill out the array
for (int i = 0; i < numSamples; ++i) {
sample[i] = Math.sin(2 * Math.PI * i/(sampleRate/freqOfTone));
}
// convert to 16 bit pcm sound array
// assumes the sample buffer is normalised.
int idx = 0;
for (final double dVal : sample) {
// scale to maximum amplitude
final short val = (short) ((dVal * 32767));
// in 16 bit wav PCM, first byte is the low order byte
generatedSnd[idx++] = (byte) (val & 0x00ff);
generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
}
}
的onClick（）方法，將每次當我按撥號盤上的按鈕時調用。
與上面的代碼我在logcat的收到這個輸出：即我正在值後
05.500 E/AudioFlinger( 85): no more track names available
09-21 05:20:05.500 E/AudioTrack( 133): AudioFlinger could not create track, status: -12
09-21 05:20:05.503 E/SoundPool( 133): Error creating AudioTrack
09-21 05:20:05.535 E/AudioFlinger( 85): no more track names available
09-21 05:20:05.535 E/AudioTrack(6080): AudioFlinger could not create track, status: -12
09-21 05:20:05.535 E/AudioTrack-JNI(6080): Error initializing AudioTrack
09-21 05:20:05.535 E/AudioTrack-Java(6080): [ android.media.AudioTrack ] Error code -20 when initializing AudioTrack.
09-21 05:20:05.535 D/AndroidRuntime(6080): Shutting down VM
09-21 05:20:05.535 W/dalvikvm(6080): threadid=1: thread exiting with uncaught exception (group=0x40015578)
09-21 05:20:05.539 E/AndroidRuntime(6080): FATAL EXCEPTION: main
09-21 05:20:05.539 E/AndroidRuntime(6080): java.lang.IllegalStateException: play() called on uninitialized AudioTrack.
09-21 05:20:05.539 E/AndroidRuntime(6080): at android.media.AudioTrack.play(AudioTrack.java:824)
09-21 05:20:05.539 E/AndroidRuntime(6080): at com.android.dial.DialPadScreen.playSound1(DialPadScreen.java:274)
09-21 05:20:05.539 E/AndroidRuntime(6080): at com.android.dial.DialPadScreen$1$1.run(DialPadScreen.java:248)
09-21 05:20:05.539 E/AndroidRuntime(6080): at android.os.Handler.handleCallback(Handler.java:587)
09-21 05:20:05.539 E/AndroidRuntime(6080): at android.os.Handler.dispatchMessage(Handler.java:92)
09-21 05:20:05.539 E/AndroidRuntime(6080): at android.os.Looper.loop(Looper.java:123)
09-21 05:20:05.539 E/AndroidRuntime(6080): at android.app.ActivityThread.main(ActivityThread.java:3687)
09-21 05:20:05.539 E/AndroidRuntime(6080): at java.lang.reflect.Method.invokeNative(Native Method)
09-21 05:20:05.539 E/AndroidRuntime(6080): at java.lang.reflect.Method.invoke(Method.java:507)
09-21 05:20:05.539 E/AndroidRuntime(6080): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
09-21 05:20:05.539 E/AndroidRuntime(6080): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
09-21 05:20:05.539 E/AndroidRuntime(6080): at dalvik.system.NativeStart.main(Native Method)
09-21 05:20:05.542 E/ ( 133): Dumpstate > /data/log/dumpstate_app_error
09-21 05:20:05.542 W/ActivityManager( 133): Force finishing activity com.android.dial/.DialPadScreen
我打印「audioTrack」直到21時我正在值1（STATE_INITIALIZED）的狀態'0'（STATE_UNINITIALIZED）。不知道爲什麼國家正在發生變化。
請幫我什麼是我需要做的防止這種力的確定關閉問題在我的應用程序的變化。 或請建議是否有其他方法來做到這一點。