Android:Example

lastmod 2024-11-29created 2016-12-093 edits

Tips & Examples related to Android.

Examples

• Android:Example: Simple Android examples.
• Java:Example: Simple Java examples.
• Java:Example:GlobalSetting‎‎: Manages setting variables used globally.
• Android.opengl.GLSurfaceView#Example: Android GLSurfaceView Sample.
• Android:Example:DipCalc: Converts between Android dip and pixel units.
• Android:Example:DisplayInfo: Gets Android display device information.
• Android.content.SharedPreferences:Example: Saves/loads Android user information (Preference).
• Android:Example:SpinnerDialog: How to show a SPINNER-TYPE dialog on Android.
• Android:Example:Png2Mp4: Sample program that converts png images to mp4.
• Android:Example:MusicInfo: Sample class that gets music information on Android.
• Android:Example:DirectoryManager: Helps get the list of predefined directories available on Android.
• Android:Example:SocketServer: Sample example of building a Socket Server and Socket Client on Android.
• Java.lang.String:InitialConsonant: Example class for Hangul initial consonant (choseong) search (InitialConsonant)
• Android:Example:ImageAdapter: (Geosoft Roadie Android) List box class with image + string selection (items selectable).
• Android:Example:SpinnerBox: (Geosoft Roadie Android) Class that shows a dialog box with a spinner progress icon.
• Android:Example:NdkOpenGLESGeometry: (Geosoft Roadie Android) Geometry rendering using OpenGLES on the NDK side.
• SMS-Forward: Forwards incoming text messages to another phone, Telegram, or a webhook.

How to get a widget instance

Notes on how to get the instance of a widget control defined in an Activity's Layout XML. Below explains how to get the instance of a TextView. First, the widget must be given an ID. So open the layout XML and add an ID as below.

<TextView
android:id="@+id/TextViewIdName"/>

Add the ID with the android:id attribute, writing the ID name after @+id/. In the case above, TextViewIdName is the ID.) The added ID is automatically added as a property of the R.java class under the gen directory. Then, inside the activity for that layout, you can get the instance with findViewById() as below.

TextView text_view_object = (TextView) findViewById(R.id.TextViewIdName);

Simple way to add a button click event

A simple way to implement the click event of a Button widget defined in an Activity's Layout XML is as follows. First, use the android:onClick attribute in the Layout and write the name of the Method that will actually be implemented in the activity.

<Button
android:onClick="onClickEvent"/>

Then add the method inside the activity for that layout.

public void onClickEvent(View v) {
  // ...
}

See also

• Android