get Bitmap From Resource - Android Graphics

Android examples for Graphics:Bitmap Resource

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  2. Android
  3. Graphics
  4. Bitmap Resource

Description

get Bitmap From Resource

Demo Code

/**/* w  w w  . j  a  v  a  2s . 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.
 */
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.Drawable;
import android.media.ExifInterface;
import android.os.Build;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.util.Log;
import android.view.View;

public class Main{
    
    public static Bitmap getBitmapFromResource(Resources res, int resId,
            int reqWidth, int reqHeight) {

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Config.RGB_565;
        options.inPurgeable = true;
        options.inInputShareable = true;
        InputStream is = res.openRawResource(resId);
        return getBitmapFromStream(is, null, reqWidth, reqHeight);
    }
    
    public static Bitmap getBitmapFromStream(InputStream is, int reqWidth,
            int reqHeight) {
        byte[] data = FileUtils.input2byte(is);
        return getBitmapFromByteArray(data, 0, data.length, reqWidth,
                reqHeight);
    }
    
    public static Bitmap getBitmapFromStream(InputStream is,
            Rect outPadding, int reqWidth, int reqHeight) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(is, outPadding, options);
        options = calculateInSampleSize(options, reqWidth, reqHeight);
        return BitmapFactory.decodeStream(is, outPadding, options);
    }
    
    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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