Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;

public class Main {
    public static Bitmap resizeAndCropCenter(Bitmap bitmap, int size, boolean recycle) {
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        if (w == size && h == size)
            return bitmap;

        // scale the image so that the shorter side equals to the target;
        // the longer side will be center-cropped.
        float scale = (float) size / Math.min(w, h);

        Bitmap target = Bitmap.createBitmap(size, size, getConfig(bitmap));
        int width = Math.round(scale * bitmap.getWidth());
        int height = Math.round(scale * bitmap.getHeight());
        Canvas canvas = new Canvas(target);
        canvas.translate((size - width) / 2f, (size - height) / 2f);
        canvas.scale(scale, scale);
        Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG);
        canvas.drawBitmap(bitmap, 0, 0, paint);
        if (recycle)
            bitmap.recycle();
        return target;
    }

    /**
     * 
     * @param filePath
     * @param targetWidth
     * @param targetHeight
     * @param recycle
     * @return
     */
    public static Bitmap resizeAndCropCenter(String filePath, int targetWidth, int targetHeight, boolean recycle) {
        //get sampleBitmap
        Options opts = new Options();
        opts.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, opts);

        int scaleWidth = opts.outWidth / targetWidth;
        int scaleHeight = opts.outHeight / targetHeight;
        int scale = scaleWidth < scaleHeight ? scaleWidth : scaleHeight;
        if (scale < 1) {
            scale = 1;
        }
        opts.inJustDecodeBounds = false;
        opts.inSampleSize = scale;
        Bitmap sampleBitmap = BitmapFactory.decodeFile(filePath, opts);

        if (opts.outWidth == -1 || opts.outHeight == -1) {
            throw new IllegalArgumentException();
        }
        //get scalebitmap
        float fScaleWidth = targetWidth / ((float) opts.outWidth);
        float fScaleHeight = targetHeight / ((float) opts.outHeight);
        float fScale = fScaleWidth > fScaleHeight ? fScaleWidth : fScaleHeight;
        if (fScale > 1)
            fScale = 1;
        Matrix matrix = new Matrix();
        matrix.postScale(fScale, fScale);
        Bitmap scaleBitmap = Bitmap.createBitmap(sampleBitmap, 0, 0, opts.outWidth, opts.outHeight, matrix, true);

        //get targetBitmap
        int bitmapX = (scaleBitmap.getWidth() - targetWidth) / 2;
        bitmapX = bitmapX > 0 ? bitmapX : 0;
        int bitmapY = (scaleBitmap.getHeight() - targetHeight) / 2;
        bitmapY = bitmapY > 0 ? bitmapY : 0;
        targetWidth = targetWidth < (scaleBitmap.getWidth()) ? targetWidth : (scaleBitmap.getWidth());
        targetHeight = targetHeight < (scaleBitmap.getHeight()) ? targetHeight : (scaleBitmap.getHeight());
        Bitmap targetBitmap = Bitmap.createBitmap(scaleBitmap, bitmapX, bitmapY, targetWidth, targetHeight);

        if (recycle)
            sampleBitmap.recycle();
        return targetBitmap;
    }

    /**
     * 
     * @param filePath
     * @param targetWidth
     * @param targetHeight
     * @param recycle
     * @return
     */
    public static Bitmap resizeAndCropCenter(Bitmap bitmap, int targetWidth, int targetHeight, boolean recycle) {
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int scaleWidth = w / targetWidth;
        int scaleHeight = h / targetHeight;
        int scale = scaleWidth < scaleHeight ? scaleWidth : scaleHeight;
        if (scale < 1) {
            scale = 1;
        }
        //get scalebitmap
        float fScaleWidth = targetWidth / ((float) w);
        float fScaleHeight = targetHeight / ((float) h);
        float fScale = fScaleWidth > fScaleHeight ? fScaleWidth : fScaleHeight;
        if (fScale > 1)
            fScale = 1;
        Matrix matrix = new Matrix();
        matrix.postScale(fScale, fScale);
        Bitmap scaleBitmap = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);

        //get targetBitmap
        int bitmapX = (scaleBitmap.getWidth() - targetWidth) / 2;
        bitmapX = bitmapX > 0 ? bitmapX : 0;
        int bitmapY = (scaleBitmap.getHeight() - targetHeight) / 2;
        bitmapY = bitmapY > 0 ? bitmapY : 0;
        targetWidth = targetWidth < (scaleBitmap.getWidth()) ? targetWidth : (scaleBitmap.getWidth());
        targetHeight = targetHeight < (scaleBitmap.getHeight()) ? targetHeight : (scaleBitmap.getHeight());

        if (bitmapX == 0 && bitmapY == 0 && targetWidth == w && targetHeight == h) {
            return bitmap;
        }
        Bitmap targetBitmap = Bitmap.createBitmap(scaleBitmap, bitmapX, bitmapY, targetWidth, targetHeight);
        if (recycle)
            bitmap.recycle();
        return targetBitmap;
    }

    private static Bitmap.Config getConfig(Bitmap bitmap) {
        Bitmap.Config config = bitmap.getConfig();
        if (config == null) {
            config = Bitmap.Config.ARGB_8888;
        }
        return config;
    }
}