com.nalinstudios.iscan

Class ScannerActivity

java.lang.Object

android.content.Context

android.content.ContextWrapper

android.view.ContextThemeWrapper

android.app.Activity

androidx.core.app.ComponentActivity

androidx.activity.ComponentActivity

androidx.fragment.app.FragmentActivity

androidx.appcompat.app.AppCompatActivity

com.nalinstudios.iscan.ScannerActivity

All Implemented Interfaces:

android.content.ComponentCallbacks, android.content.ComponentCallbacks2, android.view.KeyEvent.Callback, android.view.LayoutInflater.Factory, android.view.LayoutInflater.Factory2, android.view.TextureView.SurfaceTextureListener, android.view.View.OnClickListener, android.view.View.OnCreateContextMenuListener, android.view.Window.Callback, androidx.activity.OnBackPressedDispatcherOwner, androidx.appcompat.app.ActionBarDrawerToggle.DelegateProvider, androidx.appcompat.app.AppCompatCallback, androidx.core.app.ActivityCompat.OnRequestPermissionsResultCallback, androidx.core.app.ActivityCompat.RequestPermissionsRequestCodeValidator, androidx.core.app.TaskStackBuilder.SupportParentable, androidx.core.view.KeyEventDispatcher.Component, androidx.lifecycle.HasDefaultViewModelProviderFactory, androidx.lifecycle.LifecycleOwner, androidx.lifecycle.ViewModelStoreOwner, androidx.savedstate.SavedStateRegistryOwner

public class ScannerActivity
extends androidx.appcompat.app.AppCompatActivity
implements android.view.TextureView.SurfaceTextureListener, android.view.View.OnClickListener

This activity is the window where the user will scan the documents.

Author:

Nalin Angrish.

Nested Class Summary

Nested classes/interfaces inherited from class androidx.core.app.ComponentActivity

androidx.core.app.ComponentActivity.ExtraData

Field Summary

Fields

Modifier and Type	Field and Description
(package private) android.hardware.Camera	camera The camera variable which will be used to capture pictures
(package private) com.google.android.material.floatingactionbutton.FloatingActionButton	clickB The FABs that will be used to handle 'picture clicks', 'submissions', and the creation of 'settings popups'
(package private) int	count A variable to manage the counts
(package private) android.widget.TextView	countView The TextView to show the count of the pictures captured
(package private) android.app.Fragment	currentFragment A reference to the current fragment initialized
(package private) java.io.File	dir The directory of the current session
(package private) boolean	flash A variable to remember that whether the flash is on or not
(package private) java.util.ArrayList<android.net.Uri>	images A list of Uris of the pictures taken
(package private) com.google.android.material.floatingactionbutton.FloatingActionButton	nextB The FABs that will be used to handle 'picture clicks', 'submissions', and the creation of 'settings popups'
(package private) com.google.android.material.floatingactionbutton.FloatingActionButton	settingsB The FABs that will be used to handle 'picture clicks', 'submissions', and the creation of 'settings popups'
(package private) android.view.TextureView	texture The texture to render the frames captured by the camera
(package private) ZoomHandler	zoomHandler A handler for zooming actions

Fields inherited from class android.app.Activity

DEFAULT_KEYS_DIALER, DEFAULT_KEYS_DISABLE, DEFAULT_KEYS_SEARCH_GLOBAL, DEFAULT_KEYS_SEARCH_LOCAL, DEFAULT_KEYS_SHORTCUT, FOCUSED_STATE_SET, RESULT_CANCELED, RESULT_FIRST_USER, RESULT_OK

Fields inherited from class android.content.Context

ACCESSIBILITY_SERVICE, ACCOUNT_SERVICE, ACTIVITY_SERVICE, ALARM_SERVICE, APP_OPS_SERVICE, APPWIDGET_SERVICE, AUDIO_SERVICE, BATTERY_SERVICE, BIND_ABOVE_CLIENT, BIND_ADJUST_WITH_ACTIVITY, BIND_ALLOW_OOM_MANAGEMENT, BIND_AUTO_CREATE, BIND_DEBUG_UNBIND, BIND_EXTERNAL_SERVICE, BIND_IMPORTANT, BIND_INCLUDE_CAPABILITIES, BIND_NOT_FOREGROUND, BIND_NOT_PERCEPTIBLE, BIND_WAIVE_PRIORITY, BIOMETRIC_SERVICE, BLUETOOTH_SERVICE, CAMERA_SERVICE, CAPTIONING_SERVICE, CARRIER_CONFIG_SERVICE, CLIPBOARD_SERVICE, COMPANION_DEVICE_SERVICE, CONNECTIVITY_SERVICE, CONSUMER_IR_SERVICE, CONTEXT_IGNORE_SECURITY, CONTEXT_INCLUDE_CODE, CONTEXT_RESTRICTED, CROSS_PROFILE_APPS_SERVICE, DEVICE_POLICY_SERVICE, DISPLAY_SERVICE, DOWNLOAD_SERVICE, DROPBOX_SERVICE, EUICC_SERVICE, FINGERPRINT_SERVICE, HARDWARE_PROPERTIES_SERVICE, INPUT_METHOD_SERVICE, INPUT_SERVICE, IPSEC_SERVICE, JOB_SCHEDULER_SERVICE, KEYGUARD_SERVICE, LAUNCHER_APPS_SERVICE, LAYOUT_INFLATER_SERVICE, LOCATION_SERVICE, MEDIA_PROJECTION_SERVICE, MEDIA_ROUTER_SERVICE, MEDIA_SESSION_SERVICE, MIDI_SERVICE, MODE_APPEND, MODE_ENABLE_WRITE_AHEAD_LOGGING, MODE_MULTI_PROCESS, MODE_NO_LOCALIZED_COLLATORS, MODE_PRIVATE, MODE_WORLD_READABLE, MODE_WORLD_WRITEABLE, NETWORK_STATS_SERVICE, NFC_SERVICE, NOTIFICATION_SERVICE, NSD_SERVICE, POWER_SERVICE, PRINT_SERVICE, RECEIVER_VISIBLE_TO_INSTANT_APPS, RESTRICTIONS_SERVICE, ROLE_SERVICE, SEARCH_SERVICE, SENSOR_SERVICE, SHORTCUT_SERVICE, STORAGE_SERVICE, STORAGE_STATS_SERVICE, SYSTEM_HEALTH_SERVICE, TELECOM_SERVICE, TELEPHONY_SERVICE, TELEPHONY_SUBSCRIPTION_SERVICE, TEXT_CLASSIFICATION_SERVICE, TEXT_SERVICES_MANAGER_SERVICE, TV_INPUT_SERVICE, UI_MODE_SERVICE, USAGE_STATS_SERVICE, USB_SERVICE, USER_SERVICE, VIBRATOR_SERVICE, WALLPAPER_SERVICE, WIFI_AWARE_SERVICE, WIFI_P2P_SERVICE, WIFI_RTT_RANGING_SERVICE, WIFI_SERVICE, WINDOW_SERVICE

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
ScannerActivity()

Method Summary

Modifier and Type	Method and Description
protected void	click() A function to handle the click of a picture.
protected void	createSettingsPopup() A function to create the popup for changing the settings.
protected int	getRotation() A function to get the camera's rotation based on the manufacturer as different manufacturers assemble cameras with different orientation
void	onBackPressed() A function to handle back key presses.
void	onClick(android.view.View view) The function to handle the clicks of all the buttons.
protected void	onCreate(android.os.Bundle savedInstanceState) The main method which will show our textures and will administer the window.
protected void	onResume() A function mainly intended to refresh the screen count and hide the next-button when the user returns from the EditViewActivity ( hide if all pictures have been deleted by the user )
void	onScanFinish() A function to get notified when the corners are selected and the final image after cropping is available
void	onSurfaceTextureAvailable(android.graphics.SurfaceTexture surface, int width, int height) The function to handle the texture rendering and to enable the camera.
boolean	onSurfaceTextureDestroyed(android.graphics.SurfaceTexture surface) Blank function
void	onSurfaceTextureSizeChanged(android.graphics.SurfaceTexture surface, int width, int height) Blank function.
void	onSurfaceTextureUpdated(android.graphics.SurfaceTexture surface) Blank function.
protected void	rotateImage(java.io.File bmpfile) A function to rotate the image according to the camera orientation received by EXIF
void	startScan(java.io.File m) A function to create the window to crop the image
protected void	submit() A function to handle the click of the submit button.

Methods inherited from class androidx.appcompat.app.AppCompatActivity

addContentView, attachBaseContext, closeOptionsMenu, dispatchKeyEvent, findViewById, getDelegate, getDrawerToggleDelegate, getMenuInflater, getResources, getSupportActionBar, getSupportParentActivityIntent, invalidateOptionsMenu, onConfigurationChanged, onContentChanged, onCreateSupportNavigateUpTaskStack, onDestroy, onKeyDown, onMenuItemSelected, onMenuOpened, onNightModeChanged, onPanelClosed, onPostCreate, onPostResume, onPrepareSupportNavigateUpTaskStack, onSaveInstanceState, onStart, onStop, onSupportActionModeFinished, onSupportActionModeStarted, onSupportContentChanged, onSupportNavigateUp, onTitleChanged, onWindowStartingSupportActionMode, openOptionsMenu, setContentView, setContentView, setContentView, setSupportActionBar, setSupportProgress, setSupportProgressBarIndeterminate, setSupportProgressBarIndeterminateVisibility, setSupportProgressBarVisibility, setTheme, startSupportActionMode, supportInvalidateOptionsMenu, supportNavigateUpTo, supportRequestWindowFeature, supportShouldUpRecreateTask

Methods inherited from class androidx.fragment.app.FragmentActivity

dump, getSupportFragmentManager, getSupportLoaderManager, onActivityResult, onAttachFragment, onCreatePanelMenu, onCreateView, onCreateView, onLowMemory, onMultiWindowModeChanged, onNewIntent, onPause, onPictureInPictureModeChanged, onPrepareOptionsPanel, onPreparePanel, onRequestPermissionsResult, onResumeFragments, onStateNotSaved, setEnterSharedElementCallback, setExitSharedElementCallback, startActivityForResult, startActivityForResult, startActivityFromFragment, startActivityFromFragment, startIntentSenderForResult, startIntentSenderForResult, startIntentSenderFromFragment, supportFinishAfterTransition, supportPostponeEnterTransition, supportStartPostponedEnterTransition, validateRequestPermissionsRequestCode

Methods inherited from class androidx.activity.ComponentActivity

getDefaultViewModelProviderFactory, getLastCustomNonConfigurationInstance, getLifecycle, getOnBackPressedDispatcher, getSavedStateRegistry, getViewModelStore, onRetainCustomNonConfigurationInstance, onRetainNonConfigurationInstance

Methods inherited from class androidx.core.app.ComponentActivity

dispatchKeyShortcutEvent, getExtraData, putExtraData, superDispatchKeyEvent

Methods inherited from class android.app.Activity

closeContextMenu, createPendingResult, dismissDialog, dismissKeyboardShortcutsHelper, dispatchGenericMotionEvent, dispatchPopulateAccessibilityEvent, dispatchTouchEvent, dispatchTrackballEvent, enterPictureInPictureMode, enterPictureInPictureMode, finish, finishActivity, finishActivityFromChild, finishAffinity, finishAfterTransition, finishAndRemoveTask, finishFromChild, getActionBar, getApplication, getCallingActivity, getCallingPackage, getChangingConfigurations, getComponentName, getContentScene, getContentTransitionManager, getCurrentFocus, getFragmentManager, getIntent, getLastNonConfigurationInstance, getLayoutInflater, getLoaderManager, getLocalClassName, getMaxNumPictureInPictureActions, getMediaController, getParent, getParentActivityIntent, getPreferences, getReferrer, getRequestedOrientation, getSearchEvent, getSystemService, getTaskId, getTitle, getTitleColor, getVoiceInteractor, getVolumeControlStream, getWindow, getWindowManager, hasWindowFocus, isActivityTransitionRunning, isChangingConfigurations, isChild, isDestroyed, isFinishing, isImmersive, isInMultiWindowMode, isInPictureInPictureMode, isLocalVoiceInteractionSupported, isTaskRoot, isVoiceInteraction, isVoiceInteractionRoot, managedQuery, moveTaskToBack, navigateUpTo, navigateUpToFromChild, onActionModeFinished, onActionModeStarted, onActivityReenter, onApplyThemeResource, onAttachedToWindow, onAttachFragment, onChildTitleChanged, onContextItemSelected, onContextMenuClosed, onCreate, onCreateContextMenu, onCreateDescription, onCreateDialog, onCreateDialog, onCreateNavigateUpTaskStack, onCreateOptionsMenu, onCreatePanelView, onCreateThumbnail, onDetachedFromWindow, onEnterAnimationComplete, onGenericMotionEvent, onGetDirectActions, onKeyLongPress, onKeyMultiple, onKeyShortcut, onKeyUp, onLocalVoiceInteractionStarted, onLocalVoiceInteractionStopped, onMultiWindowModeChanged, onNavigateUp, onNavigateUpFromChild, onOptionsItemSelected, onOptionsMenuClosed, onPerformDirectAction, onPictureInPictureModeChanged, onPostCreate, onPrepareDialog, onPrepareDialog, onPrepareNavigateUpTaskStack, onPrepareOptionsMenu, onProvideAssistContent, onProvideAssistData, onProvideKeyboardShortcuts, onProvideReferrer, onRestart, onRestoreInstanceState, onRestoreInstanceState, onSaveInstanceState, onSearchRequested, onSearchRequested, onTopResumedActivityChanged, onTouchEvent, onTrackballEvent, onTrimMemory, onUserInteraction, onUserLeaveHint, onVisibleBehindCanceled, onWindowAttributesChanged, onWindowFocusChanged, onWindowStartingActionMode, onWindowStartingActionMode, openContextMenu, overridePendingTransition, postponeEnterTransition, recreate, registerActivityLifecycleCallbacks, registerForContextMenu, releaseInstance, removeDialog, reportFullyDrawn, requestDragAndDropPermissions, requestPermissions, requestShowKeyboardShortcuts, requestVisibleBehind, requestWindowFeature, requireViewById, runOnUiThread, setActionBar, setContentTransitionManager, setDefaultKeyMode, setEnterSharedElementCallback, setExitSharedElementCallback, setFeatureDrawable, setFeatureDrawableAlpha, setFeatureDrawableResource, setFeatureDrawableUri, setFinishOnTouchOutside, setImmersive, setInheritShowWhenLocked, setIntent, setMediaController, setPictureInPictureParams, setProgress, setProgressBarIndeterminate, setProgressBarIndeterminateVisibility, setProgressBarVisibility, setRequestedOrientation, setResult, setResult, setSecondaryProgress, setShowWhenLocked, setTaskDescription, setTitle, setTitle, setTitleColor, setTurnScreenOn, setVisible, setVolumeControlStream, setVrModeEnabled, shouldShowRequestPermissionRationale, shouldUpRecreateTask, showAssist, showDialog, showDialog, showLockTaskEscapeMessage, startActionMode, startActionMode, startActivities, startActivities, startActivity, startActivity, startActivityFromChild, startActivityFromChild, startActivityFromFragment, startActivityFromFragment, startActivityIfNeeded, startActivityIfNeeded, startIntentSender, startIntentSender, startIntentSenderFromChild, startIntentSenderFromChild, startLocalVoiceInteraction, startLockTask, startManagingCursor, startNextMatchingActivity, startNextMatchingActivity, startPostponedEnterTransition, startSearch, stopLocalVoiceInteraction, stopLockTask, stopManagingCursor, takeKeyEvents, triggerSearch, unregisterActivityLifecycleCallbacks, unregisterForContextMenu

Methods inherited from class android.view.ContextThemeWrapper

applyOverrideConfiguration, getAssets, getTheme, setTheme

Methods inherited from class android.content.ContextWrapper

bindIsolatedService, bindService, bindService, checkCallingOrSelfPermission, checkCallingOrSelfUriPermission, checkCallingPermission, checkCallingUriPermission, checkPermission, checkSelfPermission, checkUriPermission, checkUriPermission, clearWallpaper, createConfigurationContext, createContextForSplit, createDeviceProtectedStorageContext, createDisplayContext, createPackageContext, databaseList, deleteDatabase, deleteFile, deleteSharedPreferences, enforceCallingOrSelfPermission, enforceCallingOrSelfUriPermission, enforceCallingPermission, enforceCallingUriPermission, enforcePermission, enforceUriPermission, enforceUriPermission, fileList, getApplicationContext, getApplicationInfo, getBaseContext, getCacheDir, getClassLoader, getCodeCacheDir, getContentResolver, getDatabasePath, getDataDir, getDir, getExternalCacheDir, getExternalCacheDirs, getExternalFilesDir, getExternalFilesDirs, getExternalMediaDirs, getFilesDir, getFileStreamPath, getMainExecutor, getMainLooper, getNoBackupFilesDir, getObbDir, getObbDirs, getOpPackageName, getPackageCodePath, getPackageManager, getPackageName, getPackageResourcePath, getSharedPreferences, getSystemServiceName, getWallpaper, getWallpaperDesiredMinimumHeight, getWallpaperDesiredMinimumWidth, grantUriPermission, isDeviceProtectedStorage, isRestricted, moveDatabaseFrom, moveSharedPreferencesFrom, openFileInput, openFileOutput, openOrCreateDatabase, openOrCreateDatabase, peekWallpaper, registerReceiver, registerReceiver, registerReceiver, registerReceiver, removeStickyBroadcast, removeStickyBroadcastAsUser, revokeUriPermission, revokeUriPermission, sendBroadcast, sendBroadcast, sendBroadcastAsUser, sendBroadcastAsUser, sendOrderedBroadcast, sendOrderedBroadcast, sendOrderedBroadcastAsUser, sendStickyBroadcast, sendStickyBroadcastAsUser, sendStickyOrderedBroadcast, sendStickyOrderedBroadcastAsUser, setWallpaper, setWallpaper, startForegroundService, startInstrumentation, startService, stopService, unbindService, unregisterReceiver, updateServiceGroup

Methods inherited from class android.content.Context

getColor, getColorStateList, getDrawable, getString, getString, getSystemService, getText, obtainStyledAttributes, obtainStyledAttributes, obtainStyledAttributes, obtainStyledAttributes, registerComponentCallbacks, unregisterComponentCallbacks

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface android.view.Window.Callback

onPointerCaptureChanged

Field Detail

camera

android.hardware.Camera camera

The camera variable which will be used to capture pictures

clickB

com.google.android.material.floatingactionbutton.FloatingActionButton clickB

The FABs that will be used to handle 'picture clicks', 'submissions', and the creation of 'settings popups'

count

int count

A variable to manage the counts

countView

android.widget.TextView countView

The TextView to show the count of the pictures captured

currentFragment

android.app.Fragment currentFragment

A reference to the current fragment initialized

dir

java.io.File dir

The directory of the current session

flash

boolean flash

A variable to remember that whether the flash is on or not

images

java.util.ArrayList<android.net.Uri> images

A list of Uris of the pictures taken

nextB

com.google.android.material.floatingactionbutton.FloatingActionButton nextB

The FABs that will be used to handle 'picture clicks', 'submissions', and the creation of 'settings popups'

settingsB

com.google.android.material.floatingactionbutton.FloatingActionButton settingsB

The FABs that will be used to handle 'picture clicks', 'submissions', and the creation of 'settings popups'

texture

android.view.TextureView texture

The texture to render the frames captured by the camera

zoomHandler

ZoomHandler zoomHandler

A handler for zooming actions

Constructor Detail

ScannerActivity

public ScannerActivity()

Method Detail

click

protected void click()

A function to handle the click of a picture.

createSettingsPopup

protected void createSettingsPopup()

A function to create the popup for changing the settings. (Note that only flash is supported as yet.)

getRotation

protected int getRotation()

A function to get the camera's rotation based on the manufacturer as different manufacturers assemble cameras with different orientation

Returns:

the degrees to rotate the image

onBackPressed

public void onBackPressed()

A function to handle back key presses. It shows an alert dialog to the user to warn him that the pictures clicked till now will be deleted.

Overrides:

onBackPressed in class androidx.activity.ComponentActivity

onClick

public void onClick(android.view.View view)

The function to handle the clicks of all the buttons.

Specified by:

onClick in interface android.view.View.OnClickListener

Parameters:

view - the view object of the pressed button.

onCreate

protected void onCreate(android.os.Bundle savedInstanceState)

The main method which will show our textures and will administer the window.

Overrides:

onCreate in class androidx.appcompat.app.AppCompatActivity

Parameters:

savedInstanceState - The state of the saved instance. This state is not used.

onResume

protected void onResume()

A function mainly intended to refresh the screen count and hide the next-button when the user returns from the EditViewActivity ( hide if all pictures have been deleted by the user )

Overrides:

onResume in class androidx.fragment.app.FragmentActivity

onScanFinish

public void onScanFinish()

A function to get notified when the corners are selected and the final image after cropping is available

onSurfaceTextureAvailable

public void onSurfaceTextureAvailable(android.graphics.SurfaceTexture surface,
                                      int width,
                                      int height)

The function to handle the texture rendering and to enable the camera.

Specified by:

onSurfaceTextureAvailable in interface android.view.TextureView.SurfaceTextureListener

Parameters:

surface - The texture to render the camera on.

width - The width of the texture.

height - The height of the texture.

onSurfaceTextureDestroyed

public boolean onSurfaceTextureDestroyed(android.graphics.SurfaceTexture surface)

Blank function

Specified by:

onSurfaceTextureDestroyed in interface android.view.TextureView.SurfaceTextureListener

Parameters:

surface - The texture to render the camera on.

Returns:

true

onSurfaceTextureSizeChanged

public void onSurfaceTextureSizeChanged(android.graphics.SurfaceTexture surface,
                                        int width,
                                        int height)

Blank function.

Specified by:

onSurfaceTextureSizeChanged in interface android.view.TextureView.SurfaceTextureListener

Parameters:

surface - The texture to render the camera on.

width - The width of the texture.

height - The height of the texture.

onSurfaceTextureUpdated

public void onSurfaceTextureUpdated(android.graphics.SurfaceTexture surface)

Blank function.

Specified by:

onSurfaceTextureUpdated in interface android.view.TextureView.SurfaceTextureListener

Parameters:

surface - texture that renders the camera.

rotateImage

protected void rotateImage(java.io.File bmpfile)

A function to rotate the image according to the camera orientation received by EXIF

Parameters:

bmpfile - the bitmap to be rotated

startScan

public void startScan(java.io.File m)

A function to create the window to crop the image

Parameters:

m - the image file

submit

protected void submit()

A function to handle the click of the submit button. This starts the EditViewActivity which can be used to make changes to the pictures.