com.nalinstudios.iscan.scanlibrary

Class ScanFragment

java.lang.Object

android.app.Fragment

com.nalinstudios.iscan.scanlibrary.ScanFragment

All Implemented Interfaces:

android.content.ComponentCallbacks, android.content.ComponentCallbacks2, android.view.View.OnCreateContextMenuListener

public class ScanFragment
extends android.app.Fragment

A customized version of ScanFragment

Author:

Nalin Angrish, Jhansi.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	ScanFragment.ScanAsyncTask A class to scan the image on the click of the button.
private class	ScanFragment.ScanButtonClickListener A class to know when to scan the image.

Nested classes/interfaces inherited from class android.app.Fragment

android.app.Fragment.InstantiationException, android.app.Fragment.SavedState

Field Summary

Fields

Modifier and Type	Field and Description
private android.graphics.Bitmap	original The image to be cropped
private PolygonView	polygonView The polygonView to mark the corners
private ProgressDialogFragment	progressDialogFragment The Fragment to show when any operation is being performed
android.widget.Button	scanButton A button to approve the corners selected by the user
private android.widget.FrameLayout	sourceFrame The frame containing the source image
private android.widget.ImageView	sourceImageView The imageView containing the image to be cropped
private android.view.View	view The root view of the fragment

Fields inherited from interface android.content.ComponentCallbacks2

TRIM_MEMORY_BACKGROUND, TRIM_MEMORY_COMPLETE, TRIM_MEMORY_MODERATE, TRIM_MEMORY_RUNNING_CRITICAL, TRIM_MEMORY_RUNNING_LOW, TRIM_MEMORY_RUNNING_MODERATE, TRIM_MEMORY_UI_HIDDEN

Constructor Summary

Constructors

Constructor and Description
ScanFragment()

Method Summary

Modifier and Type	Method and Description
protected void	dismissDialog() A function to dismiss the progress dialog.
private void	getBitmap() Get the bitmap asynchronously set by the user
private java.util.List<android.graphics.PointF>	getContourEdgePoints(android.graphics.Bitmap tempBitmap) A function to get the points of the corners
private java.util.Map<java.lang.Integer,android.graphics.PointF>	getEdgePoints(android.graphics.Bitmap tempBitmap) Get edge points (corners)
private java.util.Map<java.lang.Integer,android.graphics.PointF>	getOutlinePoints(android.graphics.Bitmap tempBitmap) The outline points of the image (the actual image)
private android.graphics.Bitmap	getScannedBitmap(android.graphics.Bitmap original, java.util.Map<java.lang.Integer,android.graphics.PointF> points) A function to crop the image to the given points
private android.net.Uri	getUri() The URI of the bitmap
private void	init() The main function of the Fragment
private boolean	isScanPointsValid(java.util.Map<java.lang.Integer,android.graphics.PointF> points) A function to check whether the given points correspond to a quadrilateral or not.
android.view.View	onCreateView(android.view.LayoutInflater inflater, android.view.ViewGroup container, android.os.Bundle savedInstanceState) A function to create the view and start the main function (the init function)
void	onReceiveBitmap(android.graphics.Bitmap bitmap) A function to receive the requested bitmap
private java.util.Map<java.lang.Integer,android.graphics.PointF>	orderedValidEdgePoints(android.graphics.Bitmap tempBitmap, java.util.List<android.graphics.PointF> pointFs) A function to order the edge points
private android.graphics.Bitmap	scaledBitmap(android.graphics.Bitmap bitmap, int width, int height) A function to scale a bitmap
private void	setBitmap(android.graphics.Bitmap original) A function to set the image in the fragment
private void	showErrorDialog() A function to show an error dialog.
protected void	showProgressDialog(java.lang.String message) A function to show the progress dialog.

Methods inherited from class android.app.Fragment

dump, equals, getActivity, getAllowEnterTransitionOverlap, getAllowReturnTransitionOverlap, getArguments, getChildFragmentManager, getContext, getEnterTransition, getExitTransition, getFragmentManager, getHost, getId, getLayoutInflater, getLoaderManager, getParentFragment, getReenterTransition, getResources, getRetainInstance, getReturnTransition, getSharedElementEnterTransition, getSharedElementReturnTransition, getString, getString, getTag, getTargetFragment, getTargetRequestCode, getText, getUserVisibleHint, getView, hashCode, instantiate, instantiate, isAdded, isDetached, isHidden, isInLayout, isRemoving, isResumed, isStateSaved, isVisible, onActivityCreated, onActivityResult, onAttach, onAttach, onAttachFragment, onConfigurationChanged, onContextItemSelected, onCreate, onCreateAnimator, onCreateContextMenu, onCreateOptionsMenu, onDestroy, onDestroyOptionsMenu, onDestroyView, onDetach, onGetLayoutInflater, onHiddenChanged, onInflate, onInflate, onInflate, onLowMemory, onMultiWindowModeChanged, onMultiWindowModeChanged, onOptionsItemSelected, onOptionsMenuClosed, onPause, onPictureInPictureModeChanged, onPictureInPictureModeChanged, onPrepareOptionsMenu, onRequestPermissionsResult, onResume, onSaveInstanceState, onStart, onStop, onTrimMemory, onViewCreated, onViewStateRestored, postponeEnterTransition, registerForContextMenu, requestPermissions, setAllowEnterTransitionOverlap, setAllowReturnTransitionOverlap, setArguments, setEnterSharedElementCallback, setEnterTransition, setExitSharedElementCallback, setExitTransition, setHasOptionsMenu, setInitialSavedState, setMenuVisibility, setReenterTransition, setRetainInstance, setReturnTransition, setSharedElementEnterTransition, setSharedElementReturnTransition, setTargetFragment, setUserVisibleHint, shouldShowRequestPermissionRationale, startActivity, startActivity, startActivityForResult, startActivityForResult, startIntentSenderForResult, startPostponedEnterTransition, toString, unregisterForContextMenu

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

original

private android.graphics.Bitmap original

The image to be cropped

polygonView

private PolygonView polygonView

The polygonView to mark the corners

progressDialogFragment

private ProgressDialogFragment progressDialogFragment

The Fragment to show when any operation is being performed

scanButton

public android.widget.Button scanButton

A button to approve the corners selected by the user

sourceFrame

private android.widget.FrameLayout sourceFrame

The frame containing the source image

sourceImageView

private android.widget.ImageView sourceImageView

The imageView containing the image to be cropped

view

private android.view.View view

The root view of the fragment

Constructor Detail

ScanFragment

public ScanFragment()

Method Detail

dismissDialog

protected void dismissDialog()

A function to dismiss the progress dialog.

getBitmap

private void getBitmap()

Get the bitmap asynchronously set by the user

getContourEdgePoints

private java.util.List<android.graphics.PointF> getContourEdgePoints(android.graphics.Bitmap tempBitmap)

A function to get the points of the corners

Parameters:

tempBitmap - the bitmap to find the corners in

Returns:

the List of points

getEdgePoints

private java.util.Map<java.lang.Integer,android.graphics.PointF> getEdgePoints(android.graphics.Bitmap tempBitmap)

Get edge points (corners)

Parameters:

tempBitmap - the bitmap to track on

Returns:

the Map of corners

getOutlinePoints

private java.util.Map<java.lang.Integer,android.graphics.PointF> getOutlinePoints(android.graphics.Bitmap tempBitmap)

The outline points of the image (the actual image)

Parameters:

tempBitmap - the image to get points of

Returns:

a list of Integer-Point pairs.

getScannedBitmap

private android.graphics.Bitmap getScannedBitmap(android.graphics.Bitmap original,
                                                 java.util.Map<java.lang.Integer,android.graphics.PointF> points)

A function to crop the image to the given points

Parameters:

original - the image to be cropped

points - the points to crop the image from

Returns:

the cropped image

getUri

private android.net.Uri getUri()

The URI of the bitmap

Returns:

the URI

init

private void init()

The main function of the Fragment

isScanPointsValid

private boolean isScanPointsValid(java.util.Map<java.lang.Integer,android.graphics.PointF> points)

A function to check whether the given points correspond to a quadrilateral or not.

Parameters:

points - the points to check

Returns:

whether or not thee corners make a quadrilateral

onCreateView

public android.view.View onCreateView(android.view.LayoutInflater inflater,
                                      android.view.ViewGroup container,
                                      android.os.Bundle savedInstanceState)

A function to create the view and start the main function (the init function)

Overrides:

onCreateView in class android.app.Fragment

Parameters:

inflater - the default LayoutInflator

container - the default container

savedInstanceState - the save state of the fragment (not used)

Returns:

the inflated view.

onReceiveBitmap

public void onReceiveBitmap(android.graphics.Bitmap bitmap)

A function to receive the requested bitmap

Parameters:

bitmap - the requested bitmap

orderedValidEdgePoints

private java.util.Map<java.lang.Integer,android.graphics.PointF> orderedValidEdgePoints(android.graphics.Bitmap tempBitmap,
                                                                                        java.util.List<android.graphics.PointF> pointFs)

A function to order the edge points

Parameters:

tempBitmap - the bitmap to get ordered points of.

pointFs - the points to be ordered

Returns:

a list of Integer-Point pairs.

scaledBitmap

private android.graphics.Bitmap scaledBitmap(android.graphics.Bitmap bitmap,
                                             int width,
                                             int height)

A function to scale a bitmap

Parameters:

bitmap - the bitmap to be scaled

width - the width to be scaled to.

height - the height to be scaled to.

Returns:

the scaled bitmap

setBitmap

private void setBitmap(android.graphics.Bitmap original)

A function to set the image in the fragment

Parameters:

original - the image to be set.

showErrorDialog

private void showErrorDialog()

A function to show an error dialog.

showProgressDialog

protected void showProgressDialog(java.lang.String message)

A function to show the progress dialog.

Parameters:

message - the message to show.