Android Document Scanner

Additional

Language
Java
Version
1.5.2 (May 31, 2020)
Created
Mar 5, 2019
Updated
May 31, 2020
Owner
Muhammet Ali YUCE (mayuce)
Contributor
Muhammet Ali YUCE (mayuce)
1
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Announcement

Android Document Scanner Library

This library helps you to scan any document like CamScanner.

Requirements

You need to implement openCV to run this library via import module on Android Studio. Use OpenCV library on this repository. Follow the lines below:

  • File → New → Import Module

  • Select " openCVLibrary " you’ve downloaded from this repository.

  • Click finish

  • Sync gradle

  • File → Project Structure → Select app under modules (this is your app module) → Go to dependencies tab

  • Click + button → Module dependency → Select openCVLibrary → Click ok → Click ok

  • Sync gradle

Add line below to your top level build.gradle

allprojects {
    repositories {
        /// ....
        maven { url "https://jitpack.io" }
    }
}

Add lines below to your app level build.gradle

    implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'
    implementation 'com.github.mayuce:AndroidDocumentScanner:1.5.2'

And Sync the gradle

Usage

To start ImageCrop process

ScannerConstants.selectedImageBitmap=btimap
startActivityForResult(Intent(MainActivity@this, ImageCropActivity::class.java),Constants.REQUEST_CROP)

Catch the cropped image

if (requestCode==Constants.REQUEST_CROP && resultCode== Activity.RESULT_OK )
        {
            if (ScannerConstants.selectedImageBitmap!=null)
                imgBitmap.setImageBitmap(ScannerConstants.selectedImageBitmap)
            else
                Toast.makeText(MainActivity@this,"Something wen't wrong.",Toast.LENGTH_LONG).show()
        }

Additional Features

On above Android 9.0 there is magnifier to help user to see zoomed image to crop.

Customizing ImageCropActivity

You can customize something in layout via ScannerConstants.

    // ScannerConstants.java
    public static String cropText="CROP",
            backText="CLOSE",
            imageError="Can't picked image,
            please try again.",
            cropError="You have not selected a valid field. Please make corrections until the lines are blue.";
    public static String cropColor="#6666ff",backColor="#ff0000",progressColor="#331199"; // Default Colors
    public static boolean saveStorage=false; // Make it true if you need image in your storage.

(NEW) Version 1.5 Feature - Custom Scanner Activity!

With 1.5 version you have a feature to create your own Document Scanner Activity. You still can use old customization via ScannerConstants or you can create a new scanner activity for your layout.

HOW

  • Place Scanner layout to your layout

        <FrameLayout
                android:id="@+id/frameLayout"
                android:layout_width="match_parent"
                android:layout_height="0dp" --- * Set HERE *
                android:layout_weight="8" --- * Set HERE *
                android:layout_gravity="center"
                android:layout_margin="10dp">

            <FrameLayout
                    android:id="@+id/holderImageCrop"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_gravity="center"
                    android:layout_margin="10dp">

                <ImageView
                        android:id="@+id/imageView"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center"
                        android:adjustViewBounds="true"/>
            </FrameLayout>

            <com.labters.documentscanner.libraries.PolygonView
                    android:id="@+id/polygonView"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_gravity="center"
                    android:visibility="gone"/>
        </FrameLayout>
  • Extend your activity from DocumentScannerActivity

  • Provide values

    @Override
    protected FrameLayout getHolderImageCrop() {
        return holderImageCrop;
    }

    @Override
    protected ImageView getImageView() {
        return imageView;
    }

    @Override
    protected PolygonView getPolygonView() {
        return polygonView;
    }

    @Override
    protected Bitmap getBitmapImage() {
        return cropImage;
    }
  • Override methods

    @Override
    protected void showProgressBar() {
        RelativeLayout rlContainer = findViewById(R.id.rlContainer);
        setViewInteract(rlContainer, false);
        progressBar.setVisibility(View.VISIBLE);
    }

    @Override
    protected void hideProgressBar() {
        RelativeLayout rlContainer = findViewById(R.id.rlContainer);
        setViewInteract(rlContainer, true);
        progressBar.setVisibility(View.GONE);
    }

    @Override
    protected void showError(CropperErrorType errorType) {
        switch (errorType) {
            case CROP_ERROR:
                Toast.makeText(this, ScannerConstants.cropError, Toast.LENGTH_LONG).show();
                break;
        }
    }

And after setting your view call startCropping() method

If you have a trouble you can follow follow com.labters.documentscanner.ImageCropActivity for how to do that.

TO-DO

  • Remove RxJava dependency.

Thanks

MIT License

Copyright (c) 2020 Muhammet Ali YUCE

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.