Camera permission not automatically granted

Question

I try to access camera using Camera.open() But it throws exception Fail to connect to camera service.

I checked camera permission in Settings->Apps->MyApp->Permission->Camera and it's not granted. I have already added camera permission in android manifest.

<uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera2" android:required="true"/>

Why is it not automatically granted at the first time ? What is the best practice to handle this ?

You'll need to request permissions during the runtime. For that, you can use my library: https://github.com/nabinbhandari/Android-Permissions — Nabin Bhandari, Nov 18 '17 at 04:52

score 2 · Accepted Answer · answered Nov 18 '17 at 01:25

First check if the user grant the permission:

if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA)
    == PackageManager.PERMISSION_DENIED)

Then, you could use this to request to the user:

ActivityCompat.requestPermissions(activity, new String[] {Manifest.permission.CAMERA}, requestCode);

And in marshmallow and later, it appears the dialog

After requesting the permission alert will display to ask permission contains allow and deny options. After clicking action we can get result of the request with the following method.

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

    if (requestCode == MY_CAMERA_REQUEST_CODE) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

            Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
        }
    }
}

If you don't believe me, I have taken the answer from here.

Camera permission not automatically granted

1 Answers1