我的应用不会启动以下错误：
11-08 03:20:58.265: E/AndroidRuntime(306): FATAL EXCEPTION: main
11-08 03:20:58.265: E/AndroidRuntime(306): java.lang.NoClassDefFoundError: android.media.audiofx.Equalizer
11-08 03:20:58.265: E/AndroidRuntime(306): at com.example.audiotest.MainActivity.onCreate(MainActivity.java:86)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.os.Handler.dispatchMessage(Handler.java:99)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.os.Looper.loop(Looper.java:123)
11-08 03:20:58.265: E/AndroidRuntime(306): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-08 03:20:58.265: E/AndroidRuntime(306): at java.lang.reflect.Method.invokeNative(Native Method)
11-08 03:20:58.265: E/AndroidRuntime(306): at java.lang.reflect.Method.invoke(Method.java:521)
11-08 03:20:58.265: E/AndroidRuntime(306): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-08 03:20:58.265: E/AndroidRuntime(306): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-08 03:20:58.265: E/AndroidRuntime(306): at dalvik.system.NativeStart.main(Native Method)
11-08 03:20:58.285: E/AudioThread(306): Thread Loop Exception: java.lang.IllegalArgumentException: Invalid audio buffer size.
我的OnCreate（）代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Audio, mic to speaker
setVolumeControlStream(AudioManager.STREAM_MUSIC);
initControls();
mAudioThread = new AudioThread();
mAudioThread.start();
//end
//Equalizer
enabled = (CheckBox)findViewById(R.id.enabled);
enabled.setOnCheckedChangeListener (this);
flat = (Button)findViewById(R.id.flat);
flat.setOnClickListener(this);
bass_boost = (SeekBar)findViewById(R.id.bass_boost);
bass_boost.setOnSeekBarChangeListener(this);
bass_boost_label = (TextView) findViewById (R.id.bass_boost_label);
sliders[0] = (SeekBar)findViewById(R.id.slider_1);
slider_labels[0] = (TextView)findViewById(R.id.slider_label_1);
//more sliders till [4]
mEqualizer = new Equalizer(0, mAudioTrack.getAudioSessionId());
mEqualizer.setEnabled(true);
eq = new Equalizer (0, 0);
if (eq != null)
{
eq.setEnabled (true);
int num_bands = eq.getNumberOfBands();
num_sliders = num_bands;
short r[] = eq.getBandLevelRange();
min_level = r[0];
max_level = r[1];
for (int i = 0; i < num_sliders && i < MAX_SLIDERS; i++)
{
int[] freq_range = eq.getBandFreqRange((short)i);
sliders[i].setOnSeekBarChangeListener(this);
slider_labels[i].setText (formatBandLabel (freq_range));
}
}
for (int i = num_sliders ; i < MAX_SLIDERS; i++)
{
sliders[i].setVisibility(View.GONE);
slider_labels[i].setVisibility(View.GONE);
}
bb = new BassBoost (0, 0);
if (bb != null)
{
}
else
{
bass_boost.setVisibility(View.GONE);
bass_boost_label.setVisibility(View.GONE);
}
updateUI();
}
对于我的AudioThread：
public class AudioThread extends Thread {
// Handler message constants
public static final int PLAY = 0;
public static final int STOP = 1;
// Class variables
private boolean mRunning = false;
private boolean mPlayAudio = false;
private static class AudioThreadHandler extends Handler {
private final WeakReference<AudioThread> mThread;
public AudioThreadHandler(AudioThread thread) {
mThread = new WeakReference<AudioThread>(thread);
}
@Override
public void handleMessage(Message msg) {
AudioThread thread = mThread.get();
if (thread != null) {
switch(msg.what) {
case PLAY:
thread.mPlayAudio = true;
break;
case STOP:
thread.mPlayAudio = false;
break;
}
}
}
};
static final int bufferSize = 320000;
final short[] buffer = new short[bufferSize];
short[] readBuffer = new short[bufferSize];
private final AudioThreadHandler mAudioThreadHandler = new AudioThreadHandler(this);
@Override
public void run() {
try {
int buffersize = AudioRecord.getMinBufferSize(11025, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
AudioRecord arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize);
AudioTrack atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM);
atrack.setPlaybackRate(11025);
byte[] buffer = new byte[buffersize];
arec.startRecording();
atrack.play();
mRunning = true;
while(mRunning) {
if (mPlayAudio) {
arec.read(buffer, 0, buffersize);
atrack.write(buffer, 0, buffer.length);
}else {
}
}
} catch (Exception e) {
Log.e("AudioThread", "Thread Loop Exception: " + e);
}
}
public void close() {
mRunning = false;
}
public Handler getHandler() {
return mAudioThreadHandler;
}
}
对不起，一切看起来都很乱。但这个错误已经困扰了我很长一段时间。希望你们真的可以提供帮助。 如果你愿意的话，看看我的项目，并向我提供我做错的事情的说明。
答案 0 :(得分：0)
编辑： 你的错误行在这里：
mEqualizer = new Equalizer(0, mAudioTrack.getAudioSessionId());
我想你忘了创建mAudioTrack的实例，所以你在那里找到了null ..
mAudioTrack = new AudioTrack(streamType, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes, mode);
答案 1 :(得分：0)
API级别10，新API
希望这对你有用
答案 2 :(得分：0)
问题可能在这里 -
mEqualizer = new Equalizer（0，mAudioTrack.getAudioSessionId（））;
您需要延长mMediaPlayer.getAudioSessionId()而不是mAudioTrack.getAudioSessionId()
请检查链接 - EqualizerSettings MediaPlayer
答案 3 :(得分：0)
您在清单中有minSdkVersion="8"，但在API级别9中添加了Equalizer。
这不会直接导致崩溃，但在API级别8设备中运行代码会。将最低SDK版本更改为9，并在API级别为9或更高的设备上进行测试。或者只删除对Equalizer。