Android Tutorial

Following example demonstrates how you can use a theme for an application. For demo purpose we will modify
our default AppTheme wehere default text, its size, family, shadow etc will be changed. Let's start with creating a
simple Android application as per the following steps:
Step
1
Description
You will use Eclipse IDE to create an Android application and name it as ThemeDemo under a
package com.example.themedemo as explained in the Hello World Example chapter.
2 Modify src/MainActivity.java file to add click event listeners and handlers for the two buttons defined.
3
4
Define your style in global style file res/values/style.xml to define custom attributes for a button and
change default theme of the application to play with the text.
Modify the detault content of res/layout/activity_main.xml file to include a set of Android UI controls and
make use of the defined style.
5 Define required constants in res/values/strings.xml file
6 Run the application to launch Android emulator and verify the result of the changes done in the aplication.
Following is the content of the modified main activity filesrc/com.example.themedemo/MainActivity.java. This
file can include each of the fundamental lifecycle methods.
package com.example.themedemo;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//--- find both the buttons---
Button sButton = (Button) findViewById(R.id.button_s);
Button lButton = (Button) findViewById(R.id.button_l);
// -- register click event with first button ---
sButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// --- find the text view --
TextView txtView = (TextView) findViewById(R.id.text_id);
// -- change text size --
txtView.setTextSize(20);
}
});
// -- register click event with second button ---
lButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// --- find the text view --
TextView txtView = (TextView) findViewById(R.id.text_id);
// -- change text size --
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