get bitmap from byte array - Android Graphics

Android examples for Graphics:Bitmap Byte Array

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Description

get bitmap from byte array

Demo Code

/**//from w w w .ja v a2s . c o  m
 * Copyright 2014 Zhenguo Jin
 *
 * 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.
 */
//package com.java2s;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

public class Main {

    public static Bitmap getBitmapFromByteArray(byte[] data, int offset,
            int length, int reqWidth, int reqHeight) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeByteArray(data, offset, length, options);
        options = calculateInSampleSize(options, reqWidth, reqHeight);
        return BitmapFactory.decodeByteArray(data, offset, length, options);
    }

    public static BitmapFactory.Options calculateInSampleSize(
            final BitmapFactory.Options options, final int reqWidth,
            final int reqHeight) {
        // 
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;
        if (height > 400 || width > 450) {
            if (height > reqHeight || width > reqWidth) {
                // 
                final int heightRatio = Math.round((float) height
                        / (float) reqHeight);
                final int widthRatio = Math.round((float) width
                        / (float) reqWidth);
                // inSampleSize
                // 
                inSampleSize = heightRatio < widthRatio  heightRatio
                        : widthRatio;
            }
        }
        // 
        options.inSampleSize = inSampleSize;
        options.inJustDecodeBounds = false;
        return options;
    }
}

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