Java-Android：当SAMPLERATE设置为44100时,在未初始化的AudioRecord上调用startRecording()

02-16 10：45：45.099 24021-24021 / com.vlad.jackcomms E / AudioRecord：frameCount 1024< minFrameCount 1792 02-16 16：45：45.099 24021-24021 / com.vlad.jackcomms E / AudioRecord-JNI：创建AudioRecord实例时出错：初始化检查失败. 02-16 16：45：45.099 24021-24021 / com.vlad.jackcomms E / android.media.AudioRecord：初始化本机AudioRecord对象时出现错误代码-20.

02-16 10：45：45.109 24021-24021 / com.vlad.jackcomms E / AndroidRuntime：致命

例外：主要
    流程：com.vlad.jackcomms,PID：24021
    java.lang.IllegalStateException：在未初始化的AudioRecord上调用startRecording().

以下是相关代码：

private static final int RECORDER_SAMPLERATE = 22050*2;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

    recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
            RECORDER_SAMPLERATE, RECORDER_CHANNELS,
            RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);

    recorder.startRecording();

public void getValidSampleRates() {
    for (int rate : new int[] {44100, 22050, 11025, 16000, 8000}) {  // add the rates you wish to check against
        int bufferSize = AudioRecord.getMinBufferSize(rate, AudioFormat.CHANNEL_CONFIGURATION_DEFAULT, AudioFormat.ENCODING_PCM_16BIT);
        if (bufferSize > 0) {
            // buffer size is valid, Sample rate supported

        }
    }
}