BaseInputConnection
public class BaseInputConnection
extends Object
implements InputConnection
java.lang.Object | |
↳ | android.view.inputmethod.BaseInputConnection |
Base class for implementors of the InputConnection interface, taking care of most of the common behavior for providing a connection to an Editable. Implementors of this class will want to be sure to implement getEditable()
to provide access to their own editable object, and to refer to the documentation in InputConnection
.
Summary
Inherited constants |
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Public constructors | |
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BaseInputConnection(View targetView, boolean fullEditor) |
Public methods | |
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boolean | beginBatchEdit() Default implementation does nothing. |
boolean | clearMetaKeyStates(int states) Default implementation uses |
void | closeConnection() Default implementation calls |
boolean | commitCompletion(CompletionInfo text) Default implementation does nothing and returns false. |
boolean | commitContent(InputContentInfo inputContentInfo, int flags, Bundle opts) Default implementation which invokes |
boolean | commitCorrection(CorrectionInfo correctionInfo) Default implementation does nothing and returns false. |
boolean | commitText(CharSequence text, int newCursorPosition) Default implementation replaces any existing composing text with the given text. |
boolean | deleteSurroundingText(int beforeLength, int afterLength) The default implementation performs the deletion around the current selection position of the editable text. |
boolean | deleteSurroundingTextInCodePoints(int beforeLength, int afterLength) The default implementation performs the deletion around the current selection position of the editable text. |
boolean | endBatchEdit() Default implementation does nothing. |
boolean | finishComposingText() The default implementation removes the composing state from the current editable text. |
static int | getComposingSpanEnd(Spannable text) Return the end of the range of composing text, or -1 if there's no composing text. |
static int | getComposingSpanStart(Spannable text) Return the beginning of the range of composing text, or -1 if there's no composing text. |
int | getCursorCapsMode(int reqModes) The default implementation uses TextUtils.getCapsMode to get the cursor caps mode for the current selection position in the editable text, unless in fallback mode in which case 0 is always returned. |
Editable | getEditable() Return the target of edit operations. |
ExtractedText | getExtractedText(ExtractedTextRequest request, int flags) The default implementation always returns null. |
Handler | getHandler() Called by the system to enable application developers to specify a dedicated thread on which |
CharSequence | getSelectedText(int flags) The default implementation returns the text currently selected, or null if none is selected. |
SurroundingText | getSurroundingText(int beforeLength, int afterLength, int flags) The default implementation returns the given amount of text around the current cursor position in the buffer. |
CharSequence | getTextAfterCursor(int length, int flags) The default implementation returns the given amount of text from the current cursor position in the buffer. |
CharSequence | getTextBeforeCursor(int length, int flags) The default implementation returns the given amount of text from the current cursor position in the buffer. |
boolean | performContextMenuAction(int id) The default implementation does nothing. |
boolean | performEditorAction(int actionCode) The default implementation turns this into the enter key. |
boolean | performPrivateCommand(String action, Bundle data) The default implementation does nothing. |
static final void | removeComposingSpans(Spannable text) Removes the composing spans from the given text if any. |
boolean | replaceText(int start, int end, CharSequence text, int newCursorPosition, TextAttribute textAttribute) Replace the specific range in the editor with suggested text. |
boolean | reportFullscreenMode(boolean enabled) Updates InputMethodManager with the current fullscreen mode. |
boolean | requestCursorUpdates(int cursorUpdateMode) The default implementation does nothing. |
boolean | sendKeyEvent(KeyEvent event) Provides standard implementation for sending a key event to the window attached to the input connection's view. |
boolean | setComposingRegion(int start, int end) Mark a certain region of text as composing text. |
static void | setComposingSpans(Spannable text) Removes the composing spans from the given text if any. |
boolean | setComposingText(CharSequence text, int newCursorPosition) The default implementation places the given text into the editable, replacing any existing composing text. |
boolean | setSelection(int start, int end) The default implementation changes the selection position in the current editable text. |
TextSnapshot | takeSnapshot() Default implementation that constructs |
Inherited methods | |
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Public constructors
BaseInputConnection
public BaseInputConnection (View targetView, boolean fullEditor)
Parameters | |
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targetView | View : This value cannot be null . |
fullEditor | boolean |
Public methods
beginBatchEdit
public boolean beginBatchEdit ()
Default implementation does nothing.
Returns | |
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boolean | true if a batch edit is now in progress, false otherwise. Since this method starts a batch edit, that means it will always return true unless the input connection is no longer valid. |
clearMetaKeyStates
public boolean clearMetaKeyStates (int states)
Default implementation uses MetaKeyKeyListener.clearMetaKeyState(long, int)
to clear the state.
Parameters | |
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states | int : The states to be cleared, may be one or more bits as per KeyEvent.getMetaState() . |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
closeConnection
public void closeConnection ()
Default implementation calls finishComposingText()
and setImeConsumesInput(false)
.
If you override this method you must call through to the superclass implementation.
commitCompletion
public boolean commitCompletion (CompletionInfo text)
Default implementation does nothing and returns false.
Parameters | |
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text | CompletionInfo : The committed completion. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
commitContent
public boolean commitContent (InputContentInfo inputContentInfo, int flags, Bundle opts)
Default implementation which invokes View.performReceiveContent
on the target view if the view allows
content insertion; otherwise returns false without any side effects.
Parameters | |
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inputContentInfo | InputContentInfo : Content to be inserted. This value cannot be null . |
flags | int : InputConnection.INPUT_CONTENT_GRANT_READ_URI_PERMISSION if the content provider allows grantUriPermissions or 0 if the application does not need to call InputContentInfo.requestPermission() . |
opts | Bundle : optional bundle data. This can be null . |
Returns | |
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boolean | true if this request is accepted by the application, whether the request is already handled or still being handled in background, false otherwise. |
commitCorrection
public boolean commitCorrection (CorrectionInfo correctionInfo)
Default implementation does nothing and returns false.
Parameters | |
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correctionInfo | CorrectionInfo : Detailed information about the correction. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. Since Android Build.VERSION_CODES.N until Build.VERSION_CODES.TIRAMISU , this API returned false when the target application does not implement this method. |
commitText
public boolean commitText (CharSequence text, int newCursorPosition)
Default implementation replaces any existing composing text with the given text. In addition, only if fallback mode, a key event is sent for the new text and the current editable buffer cleared.
Parameters | |
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text | CharSequence : The text to commit. This may include styles. |
newCursorPosition | int : The new cursor position around the text, in Java characters. If > 0, this is relative to the end of the text - 1; if <= 0, this is relative to the start of the text. So a value of 1 will always advance the cursor to the position after the full text being inserted. Note that this means you can't position the cursor within the text, because the editor can make modifications to the text you are providing so it is not possible to correctly specify locations there. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
deleteSurroundingText
public boolean deleteSurroundingText (int beforeLength, int afterLength)
The default implementation performs the deletion around the current selection position of the editable text.
Parameters | |
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beforeLength | int : The number of characters before the cursor to be deleted, in code unit. If this is greater than the number of existing characters between the beginning of the text and the cursor, then this method does not fail but deletes all the characters in that range. |
afterLength | int : The number of characters after the cursor to be deleted, in code unit. If this is greater than the number of existing characters between the cursor and the end of the text, then this method does not fail but deletes all the characters in that range. |
Returns | |
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boolean | true when selected text is deleted, false when either the selection is invalid or not yet attached (i.e. selection start or end is -1), or the editable text is null . |
deleteSurroundingTextInCodePoints
public boolean deleteSurroundingTextInCodePoints (int beforeLength, int afterLength)
The default implementation performs the deletion around the current selection position of the editable text.
Parameters | |
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beforeLength | int : The number of characters before the cursor to be deleted, in code points. If this is greater than the number of existing characters between the beginning of the text and the cursor, then this method does not fail but deletes all the characters in that range. |
afterLength | int : The number of characters after the cursor to be deleted, in code points. If this is greater than the number of existing characters between the cursor and the end of the text, then this method does not fail but deletes all the characters in that range. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. Before Android Build.VERSION_CODES.TIRAMISU , this API returned false when the target application does not implement this method. |
endBatchEdit
public boolean endBatchEdit ()
Default implementation does nothing.
Returns | |
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boolean | For editor authors, you must return true if a batch edit is still in progress after closing the latest one (in other words, if the nesting count is still a positive number). Return false otherwise. For IME authors, you will always receive true as long as the request was sent to the editor, and receive false only if the input connection is no longer valid. |
finishComposingText
public boolean finishComposingText ()
The default implementation removes the composing state from the current editable text. In addition, only if fallback mode, a key event is sent for the new text and the current editable buffer cleared.
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
getComposingSpanEnd
public static int getComposingSpanEnd (Spannable text)
Return the end of the range of composing text, or -1 if there's no composing text.
Parameters | |
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text | Spannable : This value cannot be null . |
Returns | |
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int |
getComposingSpanStart
public static int getComposingSpanStart (Spannable text)
Return the beginning of the range of composing text, or -1 if there's no composing text.
Parameters | |
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text | Spannable : This value cannot be null . |
Returns | |
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int |
getCursorCapsMode
public int getCursorCapsMode (int reqModes)
The default implementation uses TextUtils.getCapsMode to get the cursor caps mode for the current selection position in the editable text, unless in fallback mode in which case 0 is always returned.
Parameters | |
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reqModes | int : The desired modes to retrieve, as defined by TextUtils.getCapsMode . These constants are defined so that you can simply pass the current TextBoxAttribute.contentType value directly in to here. |
Returns | |
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int | the caps mode flags that are in effect at the current cursor position. See TYPE_TEXT_FLAG_CAPS_* in InputType . |
getEditable
public Editable getEditable ()
Return the target of edit operations. The default implementation returns its own fake editable that is just used for composing text; subclasses that are real text editors should override this and supply their own.
Subclasses could override this method to turn null.
Returns | |
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Editable |
getExtractedText
public ExtractedText getExtractedText (ExtractedTextRequest request, int flags)
The default implementation always returns null.
Parameters | |
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request | ExtractedTextRequest : Description of how the text should be returned. ExtractedTextRequest |
flags | int : Additional options to control the client, either 0 or InputConnection.GET_EXTRACTED_TEXT_MONITOR . |
Returns | |
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ExtractedText | an ExtractedText object describing the state of the text view and containing the extracted text itself, or null if the input connection is no longer valid of the editor can't comply with the request for some reason. |
getHandler
public Handler getHandler ()
Called by the system to enable application developers to specify a dedicated thread on which InputConnection
methods are called back.
Editor authors: although you can return your custom subclasses of Handler
, the system only uses Looper
returned from Handler.getLooper()
. You cannot intercept or cancel InputConnection
callbacks by implementing this method.
IME authors: This method is not intended to be called from the IME. You will always receive null
.
Returns | |
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Handler | This value may be null . |
getSelectedText
public CharSequence getSelectedText (int flags)
The default implementation returns the text currently selected, or null if none is selected.
Parameters | |
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flags | int : Supplies additional options controlling how the text is returned. May be either 0 or InputConnection.GET_TEXT_WITH_STYLES . |
Returns | |
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CharSequence | the text that is currently selected, if any, or null if no text is selected. |
getSurroundingText
public SurroundingText getSurroundingText (int beforeLength, int afterLength, int flags)
The default implementation returns the given amount of text around the current cursor position in the buffer.
Parameters | |
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beforeLength | int : Value is 0 or greater |
afterLength | int : Value is 0 or greater |
flags | int : Supplies additional options controlling how the text is returned. May be either 0 or InputConnection.GET_TEXT_WITH_STYLES . Value is either 0 or InputConnection.GET_TEXT_WITH_STYLES |
Returns | |
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SurroundingText | This value may be null . |
getTextAfterCursor
public CharSequence getTextAfterCursor (int length, int flags)
The default implementation returns the given amount of text from the current cursor position in the buffer.
Parameters | |
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length | int : Value is 0 or greater |
flags | int : Supplies additional options controlling how the text is returned. May be either 0 or InputConnection.GET_TEXT_WITH_STYLES . |
Returns | |
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CharSequence | This value may be null . |
getTextBeforeCursor
public CharSequence getTextBeforeCursor (int length, int flags)
The default implementation returns the given amount of text from the current cursor position in the buffer.
Parameters | |
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length | int : Value is 0 or greater |
flags | int : Supplies additional options controlling how the text is returned. May be either 0 or InputConnection.GET_TEXT_WITH_STYLES . |
Returns | |
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CharSequence | This value may be null . |
performContextMenuAction
public boolean performContextMenuAction (int id)
The default implementation does nothing.
Parameters | |
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id | int |
Returns | |
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boolean |
performEditorAction
public boolean performEditorAction (int actionCode)
The default implementation turns this into the enter key.
Parameters | |
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actionCode | int : This must be one of the action constants for EditorInfo.imeOptions , such as EditorInfo.EDITOR_ACTION_GO , or the value of EditorInfo.actionId if a custom action is available. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
performPrivateCommand
public boolean performPrivateCommand (String action, Bundle data)
The default implementation does nothing.
Parameters | |
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action | String : Name of the command to be performed. This must be a scoped name, i.e. prefixed with a package name you own, so that different developers will not create conflicting commands. |
data | Bundle : Any data to include with the command. |
Returns | |
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boolean | true if the command was sent (whether or not the associated editor understood it), false if the input connection is no longer valid. |
removeComposingSpans
public static final void removeComposingSpans (Spannable text)
Removes the composing spans from the given text if any.
Parameters | |
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text | Spannable : the spannable text to remove composing spans This value cannot be null . |
replaceText
public boolean replaceText (int start, int end, CharSequence text, int newCursorPosition, TextAttribute textAttribute)
Replace the specific range in the editor with suggested text.
This method finishes whatever composing text is currently active and leaves the text as-it, replaces the specific range of text with the passed CharSequence, and then moves the cursor according to newCursorPosition
. This behaves like calling finishComposingText()
, setSelection(start, end)
, and then commitText(text, newCursorPosition, textAttribute)
.
Similar to setSelection(int, int)
, the order of start and end is not important. In effect, the region from start to end and the region from end to start is the same. Editor authors, be ready to accept a start that is greater than end.
Parameters | |
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start | int : Value is 0 or greater |
end | int : Value is 0 or greater |
text | CharSequence : This value cannot be null . |
newCursorPosition | int : the new cursor position around the text. If > 0, this is relative to the end of the text - 1; if <= 0, this is relative to the start of the text. So a value of 1 will always advance you to the position after the full text being inserted. Note that this means you can't position the cursor within the text. |
textAttribute | TextAttribute : This value may be null . |
Returns | |
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boolean | true if the replace command was sent to the associated editor (regardless of whether the replacement is success or not), false otherwise. |
reportFullscreenMode
public boolean reportFullscreenMode (boolean enabled)
Updates InputMethodManager with the current fullscreen mode.
Parameters | |
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enabled | boolean |
Returns | |
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boolean | For editor authors, the return value will always be ignored. For IME authors, this always returns true on Build.VERSION_CODES.N_MR1 and prior devices and false on Build.VERSION_CODES.O and later devices. |
requestCursorUpdates
public boolean requestCursorUpdates (int cursorUpdateMode)
The default implementation does nothing.
Parameters | |
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cursorUpdateMode | int : any combination of update modes and filters: InputConnection.CURSOR_UPDATE_IMMEDIATE , InputConnection.CURSOR_UPDATE_MONITOR , and data filters: InputConnection.CURSOR_UPDATE_FILTER_CHARACTER_BOUNDS , InputConnection.CURSOR_UPDATE_FILTER_EDITOR_BOUNDS , InputConnection.CURSOR_UPDATE_FILTER_INSERTION_MARKER , InputConnection.CURSOR_UPDATE_FILTER_VISIBLE_LINE_BOUNDS , InputConnection.CURSOR_UPDATE_FILTER_TEXT_APPEARANCE . Pass 0 to disable them. However, if an unknown flag is provided, request will be rejected and method will return false . |
Returns | |
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boolean | true if the request is scheduled. false to indicate that when the application will not call InputMethodManager.updateCursorAnchorInfo( android.view.View, CursorAnchorInfo) . Since Android Build.VERSION_CODES.N until Build.VERSION_CODES.TIRAMISU , this API returned false when the target application does not implement this method. |
sendKeyEvent
public boolean sendKeyEvent (KeyEvent event)
Provides standard implementation for sending a key event to the window attached to the input connection's view.
Parameters | |
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event | KeyEvent : The key event. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
setComposingRegion
public boolean setComposingRegion (int start, int end)
Mark a certain region of text as composing text. If there was a composing region, the characters are left as they were and the composing span removed, as if finishComposingText()
has been called. The default style for composing text is used.
The passed indices are clipped to the contents bounds. If the resulting region is zero-sized, no region is marked and the effect is the same as that of calling finishComposingText()
. The order of start and end is not important. In effect, the region from start to end and the region from end to start is the same. Editor authors, be ready to accept a start that is greater than end.
Since this does not change the contents of the text, editors should not call InputMethodManager.updateSelection(View, int, int, int, int)
and IMEs should not receive InputMethodService.onUpdateSelection(int, int, int, int, int, int)
.
This has no impact on the cursor/selection position. It may result in the cursor being anywhere inside or outside the composing region, including cases where the selection and the composing region overlap partially or entirely.
Parameters | |
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start | int : the position in the text at which the composing region begins |
end | int : the position in the text at which the composing region ends |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. Since Android Build.VERSION_CODES.N until Build.VERSION_CODES.TIRAMISU , this API returned false when the target application does not implement this method. |
setComposingSpans
public static void setComposingSpans (Spannable text)
Removes the composing spans from the given text if any.
Parameters | |
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text | Spannable : the spannable text to remove composing spans This value cannot be null . |
setComposingText
public boolean setComposingText (CharSequence text, int newCursorPosition)
The default implementation places the given text into the editable, replacing any existing composing text. The new text is marked as in a composing state with the composing style.
Parameters | |
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text | CharSequence : The composing text with styles if necessary. If no style object attached to the text, the default style for composing text is used. See Spanned for how to attach style object to the text. SpannableString and SpannableStringBuilder are two implementations of the interface Spanned . |
newCursorPosition | int : The new cursor position around the text. If > 0, this is relative to the end of the text - 1; if <= 0, this is relative to the start of the text. So a value of 1 will always advance you to the position after the full text being inserted. Note that this means you can't position the cursor within the text, because the editor can make modifications to the text you are providing so it is not possible to correctly specify locations there. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
setSelection
public boolean setSelection (int start, int end)
The default implementation changes the selection position in the current editable text.
Parameters | |
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start | int : the character index where the selection should start. |
end | int : the character index where the selection should end. |
Returns | |
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boolean | true on success, false if the input connection is no longer valid. |
takeSnapshot
public TextSnapshot takeSnapshot ()
Default implementation that constructs TextSnapshot
with information extracted from BaseInputConnection
.
Returns | |
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TextSnapshot | null when TextSnapshot cannot be fully taken. |