java - android.media.AudioRecord;错误

Question

我尝试在 Android 应用程序中为我的吉他制作一个调音器。为此，我使用了库AudioRecord.java，但在编译时出现错误:

07-03 13:48:49.041 2391-2426/? E/AudioRecord: AudioFlinger could not create record track, status: -1
07-03 13:48:49.044 2391-2426/? E/AudioRecord-JNI: Error  creating AudioRecord instance: initialization check failed with status -1.
07-03 13:48:49.044 2391-2426/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.

      --------- beginning of crash
07-03 13:48:49.046 2391-2426/? E/AndroidRuntime: FATAL EXCEPTION: Thread-5
    Process: com.example.gaetan.tuner, PID: 2391
    java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.
        at android.media.AudioRecord.startRecording(AudioRecord.java:976)
        at com.example.gaetan.tuner.audio.CaptureThread.run(CaptureThread.java:34)

在AudioRecord.java中我可以看到

import android.os.ServiceManager; cannot be resolved 

我可以做些什么来改变这种情况？

Answer 1

这个问题很可能与支持的采样率有关。以下代码将为您提供一个谓词，用于检查是否支持您所需的采样率。

        int sampleRate = 44100;
        int bufferSize = AudioRecord.getMinBufferSize(44100, AudioFormat.CHANNEL_CONFIGURATION_DEFAULT, AudioFormat.ENCODING_PCM_16BIT);

        if (bufferSize > 0) {
            //the sample rate is supported so create your AudioRecord
        } else {
            // sample size is not supported
        }

有关支持多种采样率的更高级版本，请参阅给出的答案 here