When your android application grows, there are a lot of util classes. And sometimes you need to use android application context in those classes to do something like create a Toast message or create a Snackbar popup. And if you pass the application context object as an input parameter to every util class, you will […]

This article will give you an example of how to create android contact programmatically and how to insert each android contact field into the contact data table. When clicking the add contact button, it will generate one contact and insert it into android contact tables.

Android storage can be divided into two types, internal storage, and external storage. This article will introduce both internal and external storage and how to use them to save files in your android application.

When you write an android app, you sometimes may need to change system settings. For example, change the android device screen brightness. But such action needs your app to have android.permission.WRITE_SETTINGS permission, otherwise you may encounter the exception with the message java.lang.SecurityException: com.dev2qa.example was not granted this permission: android.permission.WRITE_SETTINGS.