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java - 权限对话框未显示 - 简单权限

问题描述

我正在开发一个应该具有“RECORD_AUDIO”权限的应用程序，但在实现以下代码后，对话框没有显示。每当我手动进入设备上的应用程序设置以打开权限时，它都可以正常工作。

public class MainActivity extends AppCompatActivity implements  EasyPermissions.PermissionCallbacks {

AudioDispatcher dispatcher = AudioDispatcherFactory.fromDefaultMicrophone(22050,1024,0);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    String[] perms = {Manifest.permission.RECORD_AUDIO};
    if (EasyPermissions.hasPermissions(this, perms)) {
        initiateAudio();
        // Already have permission, do the thing
        // ...
    } else {
        // Do not have permissions, request them now
        EasyPermissions.requestPermissions(this, "REQUEST_AUDIO",
                1, perms);
    }



}


private void initiateAudio(){

    PitchDetectionHandler pdh = new PitchDetectionHandler() {
        @Override
        public void handlePitch(PitchDetectionResult result, AudioEvent e) {
            final float pitchInHz = result.getPitch();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    TextView text = (TextView) findViewById(R.id.textView);
                    text.setText("" + pitchInHz);
                }
            });
        }
    };

    AudioProcessor p = new PitchProcessor(PitchProcessor.PitchEstimationAlgorithm.FFT_YIN, 22050, 1024, pdh);
    dispatcher.addAudioProcessor(p);
    new Thread(dispatcher,"Audio Dispatcher").start();

}

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

}

@Override
public void onPermissionsGranted(int requestCode, List<String> list) {
    initiateAudio();
}

@Override
public void onPermissionsDenied(int requestCode, List<String> list) {
    Toast.makeText(this, "Audio Permission not granted", Toast.LENGTH_LONG).show();
}
}

这是清单的相关部分：

 <uses-sdk
    android:minSdkVersion="15"
    android:targetSdkVersion="26" />
<uses-permission android:name="android.permission.RECORD_AUDIO"/>

我在这里缺少一些简单的东西吗？

标签： javaandroidpermissions

解决方案

我发现了问题所在：

AudioDispatcher dispatcher = AudioDispatcherFactory.fromDefaultMicrophone(22050,1024,0);

需要在请求权限之后调用，而不是之前。

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