Monday, 18 April 2016

Button






Android Button represents a push-button. The android.widget.Button is subclass of TextView class and CompoundButton is the subclass of Button class.

 There are different types of buttons in android such as RadioButton, ToggleButton, CompoundButton etc.






activity_main.xml

 <?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:paddingBottom="@dimen/activity_vertical_margin"  
   android:paddingLeft="@dimen/activity_horizontal_margin"  
   android:paddingRight="@dimen/activity_horizontal_margin"  
   android:paddingTop="@dimen/activity_vertical_margin"  
   tools:context="com.androidtutorialforum.button.MainActivity">  
   
   <TextView  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:text="Android Tutorial Forum" />  
   
   <Button  
     android:id="@+id/button1"  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:layout_centerHorizontal="true"  
     android:layout_centerVertical="true"  
     android:text="@string/button" />  
 </RelativeLayout>






MainActivity.java

 package com.androidtutorialforum.button;  
   
 import android.support.v7.app.AppCompatActivity;  
 import android.os.Bundle;  
 import android.view.View;  
 import android.widget.Button;  
   
   
 public class MainActivity extends AppCompatActivity {  
   
   private Button button;  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_main);  
     button=(Button)findViewById(R.id.button1);  
     button.setOnClickListener(new View.OnClickListener() {  
       @Override  
       public void onClick(View v) {  
         // code here  
       }  
     });  
       
   }  
 }




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