Scaling Bitmap Image in Android

Scale Bitmap

To scale bitmap, we can use the following code:
Matrix matrix = new Matrix();
matrix.postScale(xScale, yScale);
Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0, orgWidth, orgHeight, matrix, true);

package com.AndroidScaleBitmap;

 

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Matrix;

import android.os.Bundle;

import android.widget.ImageView;

 

public class AndroidScaleBitmapActivity extends Activity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

         

        ImageView image1 = (ImageView)findViewById(R.id.image1);

        ImageView image2 = (ImageView)findViewById(R.id.image2);

         

        Bitmap oldBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

         

        int orgWidth = oldBitmap.getWidth();

        int orgHeight = oldBitmap.getHeight();

        int newWidth = 300;

        int newHeight = 300;

        float xScale = newWidth/orgWidth;

        float yScale = newHeight/orgHeight;

         

        Matrix matrix = new Matrix();

        matrix.postScale(xScale, yScale);

        Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0, orgWidth, orgHeight, matrix, true);

         

        image1.setImageBitmap(oldBitmap);

        image2.setImageBitmap(newBitmap);

    }

}



















<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

 

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/hello" />

    <ImageView

        android:id="@+id/image1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />

    <ImageView

        android:id="@+id/image2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />

 

</LinearLayout>