Android - Style Demo Example


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Following example demonstrates how you can use a Style for individual elements. Let's start with creating a simple Android application as per the following steps −

Step Description
1 You will use Android Studio IDE to create an Android application and name it as myapplication under a package com.example.saira_000.myapplication as explained in the Hello World Example chapter.
2 Modify src/MainActivity.java file to add click event listeners and handlers for the button defined
3 Define your style in global style file res/values/style.xml to define custom attributes for a button.
4 Modify the default content of res/layout/activity_main.xml file to include a set of Android UI controls and make use of the defined style.
5 Run the application to launch Android emulator and verify the result of the changes done in the application.

Following is the content of the modified main activity file src/com.example.myapplication/MainActivity.java. This file can include each of the fundamental lifecycle methods.

package com.example.saira_000.myapplication;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
   Button b1;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      
      b1=(Button)findViewById(R.id.button);
      b1.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            Toast.makeText(MainActivity.this,"YOUR MESSAGE",Toast.LENGTH_LONG).show();
         }
      });
   }
}

Following will be the content of res/values/style.xml file which will have addition style CustomButtonStyle defined −

<resources>

   <!-- Base application theme. -->
   
   <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
      <!-- Customize your theme here. -->
		<item name="colorPrimary">@color/colorPrimary</item>
      <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
      <item name="colorAccent">@color/colorAccent</item>
   </style>
   
   <style name="CustomButtonStyle">
      <item name="android:layout_width">100dp</item>
      <item name="android:layout_height">38dp</item>
      <item name="android:capitalize">characters</item>
      <item name="android:typeface">monospace</item>
      <item name="android:shadowDx">1.2</item>
      <item name="android:shadowDy">1.2</item>
      <item name="android:shadowRadius">2</item>
      <item name="android:textColor">#000000</item>
      <item name="android:gravity" >center</item>
      <item name="android:layout_margin" >3dp</item>
      <item name="android:textSize" >5pt</item>
      <item name="android:background">#70ff106d</item>
      <item name="android:shadowColor" >#70ff106d</item>
   </style>

</resources>

Following will be the content of res/layout/activity_main.xml file −

Here abc indicates about tutorialspoint logo
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
   android:layout_height="match_parent" 
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
   >

   <TextView
      android:id="@+id/textView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Custom Button Style "
      android:layout_alignParentTop="true"
      android:layout_centerHorizontal="true"
      android:textSize="30dp" />

   <TextView
      android:id="@+id/textView2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Tutorials point "
      android:textColor="#ff87ff09"
      android:textSize="30dp"
      android:layout_below="@+id/textView1"
      android:layout_centerHorizontal="true" />

   <ImageButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/imageButton"
      android:src="@drawable/abc"
      android:layout_below="@+id/textView2"
      android:layout_centerHorizontal="true" />

   <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      style="@style/CustomButtonStyle"
      android:text="New Button"
      android:id="@+id/button"
      android:layout_below="@+id/imageButton"
      android:layout_alignLeft="@+id/imageButton"
      android:layout_alignStart="@+id/imageButton"
      android:layout_alignRight="@+id/textView2"
      android:layout_alignEnd="@+id/textView2" />

</RelativeLayout>

Following will be the content of res/values/strings.xml to define two new constants −

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <string name="app_name">myapplication</string>
</resources>

Following is the default content of AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.guidemo">
      
   <application
      android:allowBackup="true"
      android:icon="@drawable/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" >
      
      <activity
         android:name="com.example.saira_000.myapplication"
         android:label="@string/app_name" >
         
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
         
      </activity>
      
   </application>
</manifest>

Let's try to run your myapplication application. I assume you had created your AVD while doing environment setup. To run the app from Android studio, open one of your project's activity files and click Run Eclipse Run Icon icon from the toolbar. Android studio installs the app on your AVD and starts it and if everything is fine with your setup and application, it will display following Emulator window −

Android Custom Style

If you click on above button, it gonna show toast message



android_styles_and_themes.htm
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