skills

• Android foundations. The most basic building block of Android development is a programming language. ...
• Android interactivity. ...
• Android UI. ...
• Implementing navigation. ...
• Android testing. ...
• Working with data. ...
• Notifications. ...
• Firebase on Android.

Android has built-in security features that significantly reduce the frequency and impact of application security issues. You can protect the user's privacy by using permissions. Share data securely by using signature-based permissions. Handle data security by using internal storage, external storage and ContentProviders very cautiously. By default, never export your Android component, such as ContentProvider, Service or BroadcastReceiver, unless you need to. 

Android has limited the capability of WebView to minimum functionality to avoid web security issues such as cross-site scripting (JavaScript injection). But still you need to be cautious and minimize the frequency of asking your user's credential. Instead, use an authorization token and refresh it at regular intervals.

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