scale Bitmap Image in ImageView Center Crop - Android Graphics

Android examples for Graphics:Bitmap Scale

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Description

scale Bitmap Image in ImageView Center Crop

Demo Code


//package com.java2s;
import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;
import android.graphics.Matrix;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.ImageView;

public class Main {
    public static void scaleCenterCrop(Bitmap source, ImageView view) {
        int[] dimension = getViewDimension(view);
        int newWidth = dimension[0];
        int newHeight = dimension[1];
        int sourceWidth = source.getWidth();
        int sourceHeight = source.getHeight();
        float xScale = (float) newWidth / sourceWidth;
        float yScale = (float) newHeight / sourceHeight;
        float scale = Math.max(xScale, yScale);

        //get the resulting size after scaling
        float scaledWidth = scale * sourceWidth;
        float scaledHeight = scale * sourceHeight;

        //figure out where we should translate to
        float dx = (newWidth - scaledWidth) / 2;
        float dy = (newHeight - scaledHeight) / 2;

        Bitmap dest = Bitmap.createBitmap(newWidth, newHeight,
                source.getConfig());/*  www  . j a va 2 s  . co m*/
        Canvas canvas = new Canvas(dest);
        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);
        matrix.postTranslate(dx, dy);
        canvas.drawBitmap(source, matrix, null);

        view.setImageBitmap(dest);
    }

    public static int[] getViewDimension(View view) {
        ViewGroup.LayoutParams lotParams = view.getLayoutParams();

        int width = lotParams.width;
        if (width <= 0) {
            width = ((WindowManager) view.getContext().getSystemService(
                    Context.WINDOW_SERVICE)).getDefaultDisplay().getWidth();
        }

        int height = lotParams.height;
        if (height <= 0) {
            height = ((WindowManager) view.getContext().getSystemService(
                    Context.WINDOW_SERVICE)).getDefaultDisplay()
                    .getHeight();
        }

        return new int[] { width, height };
    }
}

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