安卓应用程序不断破坏audioEffect错误代码-1

Question

我在我的应用程序的主要活动中放置了一些用于连续生成和回放正弦波的代码，并创建了一个PresetReverb对象来测试正弦波。但是，每次我启动它时，应用程序就会崩溃，并在logcat中生成如下内容：

08-08 14:36:10.566: E/AudioEffect(19466): set(): AudioFlinger could not create effect, status: -1
08-08 14:36:10.566: E/AudioEffects-JNI(19466): AudioEffect initCheck failed -1
08-08 14:36:10.566: E/AudioEffect-JAVA(19466): Error code -1 when initializing AudioEffect.
08-08 14:36:10.566: W/dalvikvm(19466): threadid=11: thread exiting with uncaught exception (group=0x40ac2228)
08-08 14:36:10.576: E/AndroidRuntime(19466): FATAL EXCEPTION: Thread-11436
08-08 14:36:10.576: E/AndroidRuntime(19466): java.lang.RuntimeException: Cannot initialize effect engine for type: 47382d60-ddd8-11db-bf3a-0002a5d5c51bError: -1
08-08 14:36:10.576: E/AndroidRuntime(19466):    at android.media.audiofx.AudioEffect.<init>(AudioEffect.java:387)
08-08 14:36:10.576: E/AndroidRuntime(19466):    at android.media.audiofx.PresetReverb.<init>(PresetReverb.java:136)
08-08 14:36:10.576: E/AndroidRuntime(19466):    at me.kevinossia.mystuff.MainScreen$2.run(MainScreen.java:47)

下面是该活动的代码：

package me.kevinossia.mystuff;


import me.kevinossia.mystuff.tutorial.R;
import android.app.Activity;
import android.content.Intent;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.audiofx.PresetReverb;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainScreen extends Activity
{
Thread t;
int sr = 44100;
boolean isRunning=true;
@Override
public void onCreate(Bundle savedInstanceState)
{

    super.onCreate(savedInstanceState);
    setContentView(R.layout.mainscreen);

    Button goBack = (Button) findViewById(R.id.back);

    goBack.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v) 
        {
            Intent goBack = new Intent(getApplicationContext(), HomeScreen.class);
            startActivity(goBack);
        }
    });

    t = new Thread()
    {
        public void run()
        {
            setPriority(Thread.MAX_PRIORITY);
            int buffsize = AudioTrack.getMinBufferSize(sr, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);

            AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sr, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, buffsize, AudioTrack.MODE_STREAM);

            PresetReverb reverb = new PresetReverb(0,0);

            audioTrack.attachAuxEffect(reverb.getId());
            reverb.setPreset(PresetReverb.PRESET_LARGEROOM);
            reverb.setEnabled(true);
            audioTrack.setAuxEffectSendLevel(1.0f);

            short samples[] = new short[buffsize];
            int amp = 32767;
            double twopi = 2*Math.PI;
            double fr = 262.f;
            double ph = 0.0;

            audioTrack.play();

            while(isRunning)
            {
                fr = 262;

                for(int i=0; i < buffsize; i++)
                {
                    samples[i] = (short) (amp*Math.sin(ph));
                    ph += twopi*fr/sr;
                }
                audioTrack.write(samples, 0, buffsize);
            }
            audioTrack.stop();
            audioTrack.release();

        }
    };
    t.start();

}
@Override
public void onPause()
{
    super.onPause();
    isRunning = false;
    try
    {
        t.join();
    } catch (InterruptedException e)
    {
        e.printStackTrace();
    }
    t = null;
}


}

显然，创建PresetReverb object...but的行存在问题，我不知道为什么。到底是什么原因导致我的应用程序崩溃？

Answer 1

试着添加

<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>

到清单文件中的权限列表中。