Get size (width, height) of a View

This example show how to read size of a view (Button in this example), using getWidth(), getHeight().



Be aware not to call getWidth() or getHeight() too early before the view have been laid out on the screen, otherwise "0" will be returned.

package com.AndroidResizeView;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
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);
      
       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/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>

next:
- Resize Button programmatically using Java Code