Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

import java.io.FileNotFoundException;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import android.net.Uri;

public class Main {
    /** Returns a Bitmap from the given URI that may be scaled by an integer factor to reduce its size,
     * so that its width and height are no greater than the corresponding parameters. The scale factor
     * will be a power of 2.
     */
    public static Bitmap scaledBitmapFromURIWithMaximumSize(Context context, Uri imageURI, int width, int height)
            throws FileNotFoundException {
        BitmapFactory.Options options = computeBitmapSizeFromURI(context, imageURI);
        options.inJustDecodeBounds = false;

        int wratio = powerOf2GreaterOrEqual(1.0 * options.outWidth / width);
        int hratio = powerOf2GreaterOrEqual(1.0 * options.outHeight / height);
        options.inSampleSize = Math.max(wratio, hratio);

        return BitmapFactory.decodeStream(context.getContentResolver().openInputStream(imageURI), null, options);
    }

    /** Returns a BitmapFactory.Options object containing the size of the image at the given URI,
     * without actually loading the image.
     */
    public static BitmapFactory.Options computeBitmapSizeFromURI(Context context, Uri imageURI)
            throws FileNotFoundException {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(context.getContentResolver().openInputStream(imageURI), null, options);
        return options;
    }

    static int powerOf2GreaterOrEqual(double arg) {
        if (arg < 0 && arg > (1 << 31))
            throw new IllegalArgumentException(arg + " out of range");
        int result = 1;
        while (result < arg)
            result <<= 1;
        return result;
    }
}