Android Open Source - HorizontalImageScroller-Modified Bitmap Helper

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License

The source code is released under:

Apache License

Java Source Code

/*
Copyright 2012 Two Toasters, LLC/*from  w  w  w  .  ja  v  a  2  s . co m*/

   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.twotoasters.android.horizontalimagescroller.image;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Environment;
import android.widget.ImageView;

public class BitmapHelper {

  public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;
    if(height > reqHeight || width > reqWidth) {
      if(width > height) {
        inSampleSize = Math.round((float)height / (float)reqHeight);
      } else {
        inSampleSize = Math.round((float)width / (float)reqWidth);
      }
    }
    return inSampleSize;
  }

  public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) {
    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
  }
  
  public static Bitmap decodeSampledBitmapFromSteam(InputStream stream, int reqWidth, int reqHeight) {
    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(stream, null, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    try {
      stream.reset();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return BitmapFactory.decodeStream(stream, null, options);
  }
  
  public static void applySampledResourceToImageView(Resources res, int resId, int reqWidth, int reqHeight, ImageView imageView) {
    if (resId != 0) {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        imageView.setImageDrawable(res.getDrawable(resId));
      } else {
        // workaround for old versions of android
        imageView.setImageBitmap(decodeSampledBitmapFromResource(res, resId, reqWidth, reqHeight));
      }
    }
  }
  
  public static void applySampledImageToImageView(String path, ImageView imageView) {
        
        File imgFile = new File(path);
        Bitmap imgBitmap= BitmapFactory.decodeFile(imgFile.getAbsolutePath());
        imageView.setImageBitmap(imgBitmap);
        
      }
    
    
}

Java Source Code List

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