如何向android shell用户授予android.permission.RECORD_AUDIO权限？

Posted 2021-04-21

我用android NDK构建了一些命令行工具，并在/ data / local / tmp中执行它。现在它提示我“需要android.permission.RECORD_AUDIO”。它通常在AndroidManifest.xml中用于java应用程序，但如何将其授予android shell用户？

源代码如：

sp<AudioRecord> rec = new AudioRecord(AUDIO_SOURCE_MIC, 44100, AUDIO_FORMAT_PCM_16_BIT, AUDIO_CHANNEL_IN_MONO);

logcat的：

I/AudioFlinger( 3772): AudioFlinger's thread 0xf0e838c0 ready to run
W/ServiceManager( 3772): Permission failure:android.permission.RECORD_AUDIO from uid=2000 pid=-1
E/        ( 3772): Request requires android.permission.RECORD_AUDIO
E/AudioFlinger( 3772): openRecord() permission denied: recording not allowed
E/AudioRecord(14132): AudioFlinger could not create record track, status: -1
--------- beginning of crash
...

答案

在Lollipop之后，Android平台正在使用实时权限。如果您的应用在Marshmallow和版本之后运行，则应在Activity中授予您的权限。

请求权限之前：

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) ==
                PackageManager.PERMISSION_GRANTED) {
            // put your code for Version>=Marshmallow
        } else {
            if (shouldShowRequestPermissionRationale(Manifest.permission.RECORD_AUDIO)) {
                Toast.makeText(this,
                        "App required access to audio", Toast.LENGTH_SHORT).show();
            }
            requestPermissions(new String[]{Manifest.permission.RECORD_AUDIO
            }, REQUEST_CAMERA_PERMISSION_RESULT);
        }

    } else {
        // put your code for Version < Marshmallow
    }

在此之后，请覆盖此方法并输入您的代码：

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

  if (requestCode == REQUEST_AUDIO_PERMISSION_RESULT) {
        if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(getApplicationContext(),
                    "Application will not have audio on record", Toast.LENGTH_SHORT).show();
        }
    }
}

另一答案

  private void requestRecordAudioPermission() {

        String requiredPermission = Manifest.permission.RECORD_AUDIO;

        // If the user previously denied this permission then show a message explaining why
        // this permission is needed
        if (getActivity().checkCallingOrSelfPermission(requiredPermission) == PackageManager.PERMISSION_GRANTED) {

        } else {

            Toast.makeText(getActivity(), "This app needs to record audio through the microphone....", Toast.LENGTH_SHORT).show();
            requestPermissions(new String[]{requiredPermission}, 101);
        }


    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        if (requestCode == 101 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // This method is called when the  permissions are given
        }

    }

如果您的设备有marshmallow或高级操作系统，请执行此代码