android - 小米设备通话录音时 MediaRecorder.start() 启动失败

Question

在录制通话时遇到 recorder.start() 问题，在某些设备中生成异常启动失败，在某些设备中仅录制一侧语音，在某些设备中工作正常。实际上在小米设备中不起作用下面是我的代码。

                recorder = new MediaRecorder();
                recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
                recorder.setAudioSamplingRate(8000);
                recorder.setAudioEncodingBitRate(12200);
                recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                recorder.setOutputFile(audioFile.getAbsolutePath());
                try {
                    recorder.prepare();
                } catch (IllegalStateException | IOException e) {
                    e.printStackTrace();
                }
                recorder.start();

提前致谢

Answer 1

我认为您忘记检查权限。在启动 MediaRecorder 之前调用 checkPermission()。

public void checkPermission() {
    // Check for permissions
    int permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
    int permissionRecord = ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
    // If we don't have permissions, ask user for permissions
    if (permission != PackageManager.PERMISSION_GRANTED || permissionRecord != PackageManager.PERMISSION_GRANTED) {
        String[] PERMISSIONS_STORAGE = {
                android.Manifest.permission.READ_EXTERNAL_STORAGE,
                android.Manifest.permission.RECORD_AUDIO,
                android.Manifest.permission.WRITE_EXTERNAL_STORAGE
        };

        ActivityCompat.requestPermissions(
                AudioRecorderActivity.this,
                PERMISSIONS_STORAGE,
                PERMISSION_REQUEST_RECORD
        );
    }
}


@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case PERMISSION_REQUEST_RECORD: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 1
                    && grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            } else {
                Toast.makeText(this, "Recording permission not found", Toast.LENGTH_LONG).show();
                finish();
            }
        }
    }
}