Reads bitmap from bytes - Android android.graphics

Android examples for android.graphics:Bitmap Load Save

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Description

Reads bitmap from bytes

Demo Code


import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;

public class Main {
  /**/*from w  w w .jav a  2 s . co  m*/
   * Reads bitmap from bytes
   * 
   * @param bytes
   * @return
   */
  public static Bitmap readBitmap(byte[] data) {
    if (data != null) {
      Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
      return bmp;
    }

    return null;
  }

  /**
   * Reads bitmap from byte[] and returns bitmap in requested size
   * 
   * @param data
   * @param width
   *          - of requested bitmap
   * @param height
   *          - of requested bitmap
   * @return
   */
  public static Bitmap readBitmap(byte[] data, int width, int height) {
    Bitmap tempBmp = null;
    Options options = null;

    try {
      InputStream is = new ByteArrayInputStream(data);
      options = new BitmapFactory.Options();
      options.inJustDecodeBounds = true;
      options.inPreferredConfig = Config.ARGB_8888;
      options.inSampleSize = 5;
      tempBmp = BitmapFactory.decodeStream(is, null, options);
      options.inSampleSize = calculateInSampleSize(options,
          width, height);
      options.inJustDecodeBounds = false;
      options.inBitmap = tempBmp;
      is.close();
    } catch (IOException e) {
      e.printStackTrace();
    }

    try {
      InputStream is = new ByteArrayInputStream(data);
      tempBmp = BitmapFactory.decodeStream(is, null, options);
      is.close();
    } catch (IOException e) {
      e.printStackTrace();
    }

    return tempBmp;
  }

  public static int calculateInSampleSize(BitmapFactory.Options options,
      int reqWidth, int reqHeight) {
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

      final int halfHeight = height / 2;
      final int halfWidth = width / 2;
      while ((halfHeight / inSampleSize) > reqHeight
          && (halfWidth / inSampleSize) > reqWidth) {
        inSampleSize *= 2;
      }
    }

    return inSampleSize;
  }
}

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