Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import android.graphics.Bitmap;

import android.graphics.Matrix;

import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

import android.widget.ImageView;
import android.widget.LinearLayout;

public class Main {
    public static void scaleImage(ImageView view, int boundBoxInDp) {
        // Get the ImageView and its bitmap
        Drawable drawing = view.getDrawable();
        Bitmap bitmap = ((BitmapDrawable) drawing).getBitmap();
        // Get current dimensions
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        // Determine how much to scale: the dimension requiring less scaling is
        // closer to the its side. This way the image always stays inside your
        // bounding box AND either x/y axis touches it.
        float xScale = ((float) boundBoxInDp) / width;
        float yScale = ((float) boundBoxInDp) / height;
        float scale = (xScale <= yScale) ? xScale : yScale;
        // Create a matrix for the scaling and add the scaling data
        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);
        // Create a new bitmap and convert it to a format understood by the ImageView
        Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        BitmapDrawable result = new BitmapDrawable(scaledBitmap);
        width = scaledBitmap.getWidth();
        height = scaledBitmap.getHeight();
        // Apply the scaled bitmap
        view.setImageDrawable(result);
        // Now change ImageView's dimensions to match the scaled image
        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
        params.width = width;
        params.height = height;
        view.setLayoutParams(params);
    }
}