Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

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

import android.util.Log;

public class Main {
    public static Bitmap decodeSampleBitMapFromResource(Context context, int resId, int reqWidth, int reqHeight) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(context.getResources(), resId, options);
        options = sampleBitmapOptions(context, options, reqWidth, reqHeight);
        Bitmap bm = BitmapFactory.decodeResource(context.getResources(), resId, options);
        Log.e("xxx", bm.getByteCount() + "");
        return bm;
    }

    public static BitmapFactory.Options sampleBitmapOptions(Context context, BitmapFactory.Options options,
            int reqWidth, int reqHeight) {
        int targetDensity = context.getResources().getDisplayMetrics().densityDpi;
        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        double xSScale = ((double) options.outWidth) / ((double) reqWidth);
        double ySScale = ((double) options.outHeight) / ((double) reqHeight);

        double startScale = xSScale > ySScale ? xSScale : ySScale;

        options.inScaled = true;
        options.inDensity = (int) (targetDensity * startScale);
        options.inTargetDensity = targetDensity;
        options.inJustDecodeBounds = false;
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        return options;
    }

    public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
}