Android Tutorial

Besides default android gestures, you can also create your own custom gesture and recognize them in your android app. This article will tell you how to create custom gesture and how to recognize it in your android app.

Android support drag and drop action since SDK version 11. You can drag any view component from the source container and drop it to another container ( view component ). This example will show you how to implement drag and drop action in android.

This example will tell you how to check and display swipe gesture direction in the android application. It also shows how to know whether the user single-tap or double-taps the android device screen. If you want to know basic knowledge about how to listen and respond to user gestures in the android app, please read

We all know that you can use gestures in the android app. And there are a lot of common gestures such as tap down, tap up, scroll, double-tap, swipe from left to right or right to left ( also called fling ), etc. But how to detect those gestures in your android application source code?

Android provides single and multiple touch support. If you want to respond to the touch event, you must create an instance of the android.view.View.OnTouchListener and override it’s onTouch(View view, MotionEvent motionEvent) method. Then register the listener to the view object use the view’s setOnTouchListener method.

Android uses an event queue to manage events generated by the system or device user. When an event occurred ( for example when a  user clicks a button it will trigger the on-click event ), the event will be placed in the event queue. All the events in the queue comply with the FIFO (

android.widget.GridLayout is a layout manager used to arrange child views in a grid. You can specify how many columns and rows the grid have with it’s rowCount or columnCount property. You can change the GridLayout object size by specifying it’s layout_margin property. You can even use it’s child view’s layout_rowSpan or layout_columnSpan property to merge

The android app runs in android OS, and Android OS provides a lot of functions for your app to use. So master android architecture can give you a clear overview of what you are doing, what other services and components android OS can provide, and which library should you use when you need it.