ImageUtils.java

/*
The MIT License (MIT)

Copyright (c) 2015-2017 HyperTrack (http://hypertrack.com)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
package io.hypertrack.sendeta.util;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.RelativeLayout;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created by piyush on 30/06/16.
 */
public class ImageUtils {

    public static File getFileFromBitmap(Context context, Bitmap bitmap) {
        try {
            File file = new File(context.getCacheDir(), "temp");
            if (!file.createNewFile()) {
                return null;
            }

            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG, 0, stream);
            byte[] bitmapData = stream.toByteArray();

            FileOutputStream fileOutputStream = new FileOutputStream(file);
            fileOutputStream.write(bitmapData);
            fileOutputStream.flush();
            fileOutputStream.close();

            return file;
        } catch (Exception e) {
            return null;
        }
    }

    public static File getScaledFile(File file) {
        try {
            // BitmapFactory options to downsize the image
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            o.inSampleSize = 6;
            // factor of downsizing the image

            FileInputStream inputStream = new FileInputStream(file);
            //Bitmap selectedBitmap = null;
            BitmapFactory.decodeStream(inputStream, null, o);
            inputStream.close();

            // The new size we want to scale to
            final int REQUIRED_SIZE = 75;

            // Find the correct scale value. It should be the power of 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= REQUIRED_SIZE &&
                    o.outHeight / scale / 2 >= REQUIRED_SIZE) {
                scale *= 2;
            }

            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            inputStream = new FileInputStream(file);

            Bitmap selectedBitmap = BitmapFactory.decodeStream(inputStream, null, o2);
            inputStream.close();

            // here i override the original image file
            file.createNewFile();
            FileOutputStream outputStream = new FileOutputStream(file);
            selectedBitmap.compress(Bitmap.CompressFormat.JPEG, 50, outputStream);

            return file;
        } catch (Exception e) {
            return null;
        }
    }

    public static Bitmap getRotatedBitMap(File imageFile) {
        if (imageFile == null) {
            return null;
        }

        Bitmap rotatedBitmap = null;
        Bitmap srcBitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());

        try {
            ExifInterface exif = new ExifInterface(imageFile.getName());
            String orientString = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
            int orientation = orientString != null ? Integer.parseInt(orientString) : ExifInterface.ORIENTATION_NORMAL;

            int rotationAngle = 0;
            if (orientation == ExifInterface.ORIENTATION_ROTATE_90) rotationAngle = 90;
            if (orientation == ExifInterface.ORIENTATION_ROTATE_180) rotationAngle = 180;
            if (orientation == ExifInterface.ORIENTATION_ROTATE_270) rotationAngle = 270;

            Matrix matrix = new Matrix();
            matrix.setRotate(rotationAngle, (float) srcBitmap.getWidth() / 2, (float) srcBitmap.getHeight() / 2);
            rotatedBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcBitmap.getWidth(), srcBitmap.getHeight(), matrix, true);

        } catch (IOException e) {
            e.printStackTrace();
        }

        return rotatedBitmap;
    }

    public static Bitmap getBitMapForView(Context context, View view) {
        Bitmap bitmap = null;
        try {
            DisplayMetrics displayMetrics = new DisplayMetrics();

            ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
            view.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
            view.measure(displayMetrics.widthPixels, displayMetrics.heightPixels);
            view.layout(0, 0, displayMetrics.widthPixels, displayMetrics.heightPixels);
            view.buildDrawingCache();
            bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);

            Canvas canvas = new Canvas(bitmap);
            view.draw(canvas);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return bitmap;
    }
}