get Scale Drawable - Android Graphics

Android examples for Graphics:Drawable Operation

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Description

get Scale Drawable

Demo Code


//package com.java2s;
import java.io.File;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

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

import android.util.Log;

public class Main {
    static public Drawable getScaleDraw(String imgPath, Context mContext) {

        Bitmap bitmap = null;//w  w  w .  j  a  v  a 2 s .  c  om
        try {
            Log.d("BitmapUtil",
                    "[getScaleDraw]imgPath is " + imgPath.toString());
            File imageFile = new File(imgPath);
            if (!imageFile.exists()) {
                Log.d("BitmapUtil", "[getScaleDraw]file not  exists");
                return null;
            }
            BitmapFactory.Options opts = new BitmapFactory.Options();
            opts.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(imgPath, opts);

            opts.inSampleSize = computeSampleSize(opts, -1, 800 * 480);
            // Log.d("BitmapUtil","inSampleSize===>"+opts.inSampleSize);
            opts.inJustDecodeBounds = false;
            bitmap = BitmapFactory.decodeFile(imgPath, opts);

        } catch (OutOfMemoryError err) {
            Log.d("BitmapUtil", "[getScaleDraw] out of memory");

        }
        if (bitmap == null) {
            return null;
        }
        Drawable resizeDrawable = new BitmapDrawable(
                mContext.getResources(), bitmap);
        return resizeDrawable;
    }

    public static int computeSampleSize(BitmapFactory.Options options,
            int minSideLength, int maxNumOfPixels) {

        int initialSize = computeInitialSampleSize(options, minSideLength,
                maxNumOfPixels);
        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }

        return roundedSize;

    }

    private static int computeInitialSampleSize(
            BitmapFactory.Options options, int minSideLength,
            int maxNumOfPixels) {

        double w = options.outWidth;
        double h = options.outHeight;
        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math
                .sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(
                Math.floor(w / minSideLength),
                Math.floor(h / minSideLength));

        if (upperBound < lowerBound) {
            // return the larger one when there is no overlapping zone.
            return lowerBound;
        }

        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }

    }
}

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