Button Clicking -Perform Action in android

Button Clicking -Perform Action  in android

Example: click on button will fill the some text in textField
Output :

 

activity_main.xml

 <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" >  
   <Button  
     android:id="@+id/Generate"  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:layout_alignParentBottom="true"  
     android:layout_centerHorizontal="true"  
     android:layout_marginBottom="167dp"  
     android:text="@string/generate_author_name"  
     />  
   <EditText  
     android:id="@+id/editText1"  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:layout_above="@+id/Generate"  
     android:layout_centerHorizontal="true"  
     android:layout_marginBottom="21dp"  
     android:ems="10"  
     android:inputType="textPersonName" >  
     <requestFocus />  
   </EditText>  
 </RelativeLayout>  

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements View.OnClickListener
{
 
 Button gen;
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        
        //display content of activity_main.xml
        setContentView(R.layout.activity_main);
        
        // identify the button already created in "activity_main"
        gen=(Button) findViewById(R.id.Generate);
        
        //set click listener for button
        gen.setOnClickListener(this); 
    }
    
    public void onClick(View v) 
 {
     // identify textbox already created in "activity_main"
  EditText textBox=(EditText) findViewById(R.id.editText1);
  
  //fill text in textbox
  textBox.setText("padmanLabs");
 }
 
}