Android Articles

1. User Interface

Android Header and Footer layout example

In this tutorial we will create an Android Header and Footer activity layout.

Android fixed Header and Footer with scrollable content layout example

In this tutorial we will create an Android fixed Header and Footer with scrollable content activity layout.

2. Networking and I/O

How to connect to an Android server socket in the emulator

In this tutorial you will learn how to connect to a server socket that is running in the Android emulator.

3. Widgets

Modal dialog (popup) from Android widget example

In this tutorial you will learn how to open a modal popup (or dialog) from an Android home screen widget.

4. Troubleshooting

Android 'Application not Installed' java.lang.SecurityException [invalid digest for] or [Package ... has no certificates at entry]

How to solve Android 'Application not Installed' caused by java.lang.SecurityException [invalid digest for] or [Package ... has no certificates at entry] when we sign an Android APK and install it in an Android device.

About the author

Gonçalo Marques is a Software Engineer with several years of experience in software development and architecture definition. During this period his main focus was delivering software solutions in banking, telecommunications and governmental areas. He created the Bytes Lounge website with one ultimate goal: share his knowledge with the software development community. His main area of expertise is Java and open source.

GitHub profile: https://github.com/gonmarques

He is also the author of the WiFi File Browser Android application: