How should an Android permission that looks fishy for the app but without which it's impossible to obtain a certain needed behavior be handled?

1. What app permissions should I not allow?
2. How to define custom permission in Android?
3. When should I ask for permissions on Android?

What app permissions should I not allow?

Watch out for permissions like access to your location, camera, microphone, contacts, browsing history and photo library. These can be particularly invasive and risky if not explicitly required for an app to function.

How to define custom permission in Android?

You can define custom permissions for your apps and request custom permissions from other apps by defining <uses-permission> elements.

When should I ask for permissions on Android?

Best practices

From the developer's point of view, there are several things to keep in mind when requesting permissions: We should only ask for permissions when we need them. We need to be able to deal with a denial of permission.