Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.content.Context;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class Main {

    public static Bitmap getRGB565Bitmap(int resource_id, Context context) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(context.getResources(), resource_id, options);
        int ratio = calculateInSampleSize(options, context.getResources().getDisplayMetrics().widthPixels,
                context.getResources().getDisplayMetrics().heightPixels);
        options.inSampleSize = ratio;
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        options.inJustDecodeBounds = false;
        options.inPurgeable = true;
        return BitmapFactory.decodeResource(context.getResources(), resource_id, options);
    }

    public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {

        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {
            if (width > height) {
                inSampleSize = Math.round((float) height / (float) reqHeight);
            } else {
                inSampleSize = Math.round((float) width / (float) reqWidth);
            }

            final float totalPixels = width * height;
            final float totalReqPixelsCap = reqWidth * reqHeight * 2;

            while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
                inSampleSize++;
            }
        }
        return inSampleSize;
    }
}