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Permissions In Android

Why Permission?

Categories Of Permission

1. Normal permissions - Normal permissions are those where your application requests to access data outside application’s sandbox, but there is a little risk of privacy breach. For example, setting the timezone is normal permission.
2. Signature permissions - These are the permissions which a system grants during installation time.
3. Dangerous permission - Those permissions which accesses user’s private information are dangerous permissions. For example, accessing the user contacts is dangerous permission.

Implementation

1. Add uses-permission in android manifest. For example

<uses-permission android:name="android.permission.CAMERA" />



In the above code, we will ask user for accessing camera.


2. In onCreate method, write the following code

if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) !=
  PackageManager.PERMISSION_GRANTED) {

  ActivityCompat.requestPermissions(MainActivity.this,
    new String[] {
      Manifest.permission.CAMERA
    }, 1);
}

Setting The App Permission

1. Go to settings
2. Go to App permissions
3. Select app
4. Select Camera
5. Select the option ‘Ask’.

Click to Enlarge

Output

Call Back Method For Permissions

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