Resize Button programmatically using Java Code

Buttons can be resized by changing and update LayoutParams.width and LayoutParams.height.



Notice that the width and height return from Button.getWidth() and Button.getHeight() will not reflect the updated size at once. You can click the "Check my size" button to check the updated size.

package com.AndroidResizeView;

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

public class AndroidResizeView extends Activity{
 
 TextView textMyTextView, textViewWidth, textViewHeight;
 Button myButton;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textMyTextView = (TextView)findViewById(R.id.mytextview);
        textViewWidth = (TextView)findViewById(R.id.viewwidth);
        textViewHeight = (TextView)findViewById(R.id.viewheight);
        myButton = (Button)findViewById(R.id.mybutton);
        Button btnIncWidth = (Button)findViewById(R.id.incwidth);
        Button btnDecWidth = (Button)findViewById(R.id.decwidth);
        Button btnIncHeight = (Button)findViewById(R.id.incheight);
        Button btnDecHeight = (Button)findViewById(R.id.decheight);
        
        btnIncWidth.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    ViewGroup.LayoutParams params = myButton.getLayoutParams();
    params.width++;
    myButton.setLayoutParams(params);
    updateSizeInfo();
   }});
        
        btnDecWidth.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    ViewGroup.LayoutParams params = myButton.getLayoutParams();
    params.width--;
    myButton.setLayoutParams(params);
    updateSizeInfo();
   }});
        
        btnIncHeight.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    ViewGroup.LayoutParams params = myButton.getLayoutParams();
    params.height++;
    myButton.setLayoutParams(params);
    updateSizeInfo();
   }});
        
        btnDecHeight.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    ViewGroup.LayoutParams params = myButton.getLayoutParams();
    params.height--;
    myButton.setLayoutParams(params);
    updateSizeInfo();
   }});
        
        myButton.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    updateSizeInfo();
   }});
    }
    

 @Override
 public void onWindowFocusChanged(boolean hasFocus) {
  // TODO Auto-generated method stub
  super.onWindowFocusChanged(hasFocus);
  updateSizeInfo();
 }

 private void updateSizeInfo(){

     textViewWidth.setText(String.valueOf("Button's Width(pixels): " + myButton.getWidth()));
     textViewHeight.setText(String.valueOf("Button's Height(pixels): " + myButton.getHeight()));
    }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:id="@+id/mytextview"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button 
    android:id="@+id/incwidth"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Button Width++"
    />
<Button 
    android:id="@+id/decwidth"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Button Width--"
    />
<Button 
    android:id="@+id/incheight"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Button Height++"
    />
<Button 
    android:id="@+id/decheight"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Button Height--"
    />
<Button 
    android:id="@+id/mybutton"
    android:layout_width="200px" 
    android:layout_height="wrap_content" 
    android:text="Check my size"
    />
<TextView  
    android:id="@+id/viewwidth"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/viewheight"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>