InputConnectionWrapper

InputConnectionWrapper

InputConnectionWrapper (InputConnection target, 
                boolean mutable)

Initializes a wrapper.

Caveat: Although the system can accept (InputConnection) null in some places, you cannot emulate such a behavior by non-null InputConnectionWrapper that has null in target.

beginBatchEdit

boolean beginBatchEdit ()

Tell the editor that you are starting a batch of editor operations. The editor will try to avoid sending you updates about its state until endBatchEdit() is called. Batch edits nest.

IME authors: use this to avoid getting calls to onUpdateSelection(int, int, int, int, int, int) corresponding to intermediate state. Also, use this to avoid flickers that may arise from displaying intermediate state. Be sure to call endBatchEdit() for each call to this, or you may block updates in the editor.

Editor authors: while a batch edit is in progress, take care not to send updates to the input method and not to update the display. IMEs use this intensively to this effect. Also please note that batch edits need to nest correctly.

clearMetaKeyStates

boolean clearMetaKeyStates (int states)

Clear the given meta key pressed states in the given input connection.

This can be used by the IME to clear the meta key states set by a hardware keyboard with latched meta keys, if the editor keeps track of these.

closeConnection

void closeConnection ()

Called by the system up to only once to notify that the system is about to invalidate connection between the input method and the application.

Editor authors: You can clear all the nested batch edit right now and you no longer need to handle subsequent callbacks on this connection, including beginBatchEdit()}. Note that although the system tries to call this method whenever possible, there may be a chance that this method is not called in some exceptional situations.

Note: This does nothing when called from input methods.

commitCompletion

boolean commitCompletion (CompletionInfo text)

Commit a completion the user has selected from the possible ones previously reported to InputMethodSession#displayCompletions(CompletionInfo[]) or InputMethodManager#displayCompletions(View, CompletionInfo[]). This will result in the same behavior as if the user had selected the completion from the actual UI. In all other respects, this behaves like commitText(CharSequence, int).

IME authors: please take care to send the same object that you received through onDisplayCompletions(CompletionInfo[]).

Editor authors: if you never call displayCompletions(CompletionInfo[]) or displayCompletions(View, CompletionInfo[]) then a well-behaved IME should never call this on your input connection, but be ready to deal with misbehaving IMEs without crashing.

Calling this method (with a valid CompletionInfo object) will cause the editor to call onUpdateSelection(int, int, int, int, int, int) on the current IME after the batch input is over. Editor authors, for this to happen you need to make the changes known to the input method by calling updateSelection(View, int, int, int, int), but be careful to wait until the batch edit is over if one is in progress.

commitCorrection

boolean commitCorrection (CorrectionInfo correctionInfo)

Commit a correction automatically performed on the raw user's input. A typical example would be to correct typos using a dictionary.

Calling this method will cause the editor to call onUpdateSelection(int, int, int, int, int, int) on the current IME after the batch input is over. Editor authors, for this to happen you need to make the changes known to the input method by calling updateSelection(View, int, int, int, int), but be careful to wait until the batch edit is over if one is in progress.

commitText

boolean commitText (CharSequence text, 
                int newCursorPosition)

Commit text to the text box and set the new cursor position.

This method removes the contents of the currently composing text and replaces it with the passed CharSequence, and then moves the cursor according to newCursorPosition. If there is no composing text when this method is called, the new text is inserted at the cursor position, removing text inside the selection if any. This behaves like calling setComposingText(text, newCursorPosition) then finishComposingText().

Calling this method will cause the editor to call onUpdateSelection(int, int, int, int, int, int) on the current IME after the batch input is over. Editor authors, for this to happen you need to make the changes known to the input method by calling updateSelection(View, int, int, int, int), but be careful to wait until the batch edit is over if one is in progress.

deleteSurroundingText

boolean deleteSurroundingText (int beforeLength, 
                int afterLength)

Delete beforeLength characters of text before the current cursor position, and delete afterLength characters of text after the current cursor position, excluding the selection. Before and after refer to the order of the characters in the string, not to their visual representation: this means you don't have to figure out the direction of the text and can just use the indices as-is.

The lengths are supplied in Java chars, not in code points or in glyphs.

Since this method only operates on text before and after the selection, it can't affect the contents of the selection. This may affect the composing span if the span includes characters that are to be deleted, but otherwise will not change it. If some characters in the composing span are deleted, the composing span will persist but get shortened by however many chars inside it have been removed.

IME authors: please be careful not to delete only half of a surrogate pair. Also take care not to delete more characters than are in the editor, as that may have ill effects on the application. Calling this method will cause the editor to call onUpdateSelection(int, int, int, int, int, int) on your service after the batch input is over.

Editor authors: please be careful of race conditions in implementing this call. An IME can make a change to the text or change the selection position and use this method right away; you need to make sure the effects are consistent with the results of the latest edits. Also, although the IME should not send lengths bigger than the contents of the string, you should check the values for overflows and trim the indices to the size of the contents to avoid crashes. Since this changes the contents of the editor, you need to make the changes known to the input method by calling updateSelection(View, int, int, int, int), but be careful to wait until the batch edit is over if one is in progress.

deleteSurroundingTextInCodePoints

boolean deleteSurroundingTextInCodePoints (int beforeLength, 
                int afterLength)

A variant of deleteSurroundingText(int, int). Major differences are:

• The lengths are supplied in code points, not in Java chars or in glyphs.
• This method does nothing if there are one or more invalid surrogate pairs in the requested range.

Editor authors: In addition to the requirement in deleteSurroundingText(int, int), make sure to do nothing when one ore more invalid surrogate pairs are found in the requested range.

endBatchEdit

boolean endBatchEdit ()

Tell the editor that you are done with a batch edit previously initiated with beginBatchEdit(). This ends the latest batch only.

IME authors: make sure you call this exactly once for each call to beginBatchEdit().

Editor authors: please be careful about batch edit nesting. Updates still to be held back until the end of the last batch edit.

finishComposingText

boolean finishComposingText ()

Have the text editor finish whatever composing text is currently active. This simply leaves the text as-is, removing any special composing styling or other state that was around it. The cursor position remains unchanged.

IME authors: be aware that this call may be expensive with some editors.

Editor authors: please note that the cursor may be anywhere in the contents when this is called, including in the middle of the composing span or in a completely unrelated place. It must not move.

getCursorCapsMode

int getCursorCapsMode (int reqModes)

Retrieve the current capitalization mode in effect at the current cursor position in the text. See TextUtils.getCapsMode for more information.

This method may fail either if the input connection has become invalid (such as its process crashing) or the client is taking too long to respond with the text (it is given a couple seconds to return). In either case, 0 is returned.

This method does not affect the text in the editor in any way, nor does it affect the selection or composing spans.

Editor authors: please be careful of race conditions in implementing this call. An IME can change the cursor position and use this method right away; you need to make sure the returned value is consistent with the results of the latest edits and changes to the cursor position.

getExtractedText

ExtractedText getExtractedText (ExtractedTextRequest request, 
                int flags)

Retrieve the current text in the input connection's editor, and monitor for any changes to it. This function returns with the current text, and optionally the input connection can send updates to the input method when its text changes.

This method may fail either if the input connection has become invalid (such as its process crashing) or the client is taking too long to respond with the text (it is given a couple seconds to return). In either case, null is returned.

Editor authors: as a general rule, try to comply with the fields in request for how many chars to return, but if performance or convenience dictates otherwise, please feel free to do what is most appropriate for your case. Also, if the GET_EXTRACTED_TEXT_MONITOR flag is set, you should be calling updateExtractedText(View, int, ExtractedText) whenever you call updateSelection(View, int, int, int, int).

getHandler

Handler getHandler ()

Called by the InputMethodManager to enable application developers to specify a dedicated Handler on which incoming IPC method calls from input methods will be dispatched.

Note: This does nothing when called from input methods.

getSelectedText

CharSequence getSelectedText (int flags)

Gets the selected text, if any.

This method may fail if either the input connection has become invalid (such as its process crashing) or the client is taking too long to respond with the text (it is given a couple of seconds to return). In either case, null is returned.

This method must not cause any changes in the editor's state.

If GET_TEXT_WITH_STYLES is supplied as flags, the editor should return a SpannableString with all the spans set on the text.

IME authors: please consider this will trigger an IPC round-trip that will take some time. Assume this method consumes a lot of time.

Editor authors: please be careful of race conditions in implementing this call. An IME can make a change to the text or change the selection position and use this method right away; you need to make sure the returned value is consistent with the results of the latest edits.

getTextAfterCursor

CharSequence getTextAfterCursor (int n, 
                int flags)

Get n characters of text after the current cursor position.

This method may fail either if the input connection has become invalid (such as its process crashing) or the client is taking too long to respond with the text (it is given a couple seconds to return). In either case, null is returned.

This method does not affect the text in the editor in any way, nor does it affect the selection or composing spans.

If GET_TEXT_WITH_STYLES is supplied as flags, the editor should return a SpannableString with all the spans set on the text.

IME authors: please consider this will trigger an IPC round-trip that will take some time. Assume this method consumes a lot of time.

Editor authors: please be careful of race conditions in implementing this call. An IME can make a change to the text and use this method right away; you need to make sure the returned value is consistent with the result of the latest edits. Also, you may return less than n characters if performance dictates so, but keep in mind IMEs are relying on this for many functions: you should not, for example, limit the returned value to the current line, and specifically do not return 0 characters unless the cursor is really at the end of the text.

getTextBeforeCursor

CharSequence getTextBeforeCursor (int n, 
                int flags)

Get n characters of text before the current cursor position.

This method may fail either if the input connection has become invalid (such as its process crashing) or the editor is taking too long to respond with the text (it is given a couple seconds to return). In either case, null is returned. This method does not affect the text in the editor in any way, nor does it affect the selection or composing spans.

If GET_TEXT_WITH_STYLES is supplied as flags, the editor should return a SpannableString with all the spans set on the text.

IME authors: please consider this will trigger an IPC round-trip that will take some time. Assume this method consumes a lot of time. Also, please keep in mind the Editor may choose to return less characters than requested even if they are available for performance reasons.

Editor authors: please be careful of race conditions in implementing this call. An IME can make a change to the text and use this method right away; you need to make sure the returned value is consistent with the result of the latest edits. Also, you may return less than n characters if performance dictates so, but keep in mind IMEs are relying on this for many functions: you should not, for example, limit the returned value to the current line, and specifically do not return 0 characters unless the cursor is really at the start of the text.

performContextMenuAction

boolean performContextMenuAction (int id)

Perform a context menu action on the field. The given id may be one of: selectAll, startSelectingText, stopSelectingText, cut, copy, paste, copyUrl, or switchInputMethod

performEditorAction

boolean performEditorAction (int editorAction)

Have the editor perform an action it has said it can do.

This is typically used by IMEs when the user presses the key associated with the action.

performPrivateCommand

boolean performPrivateCommand (String action, 
                Bundle data)

API to send private commands from an input method to its connected editor. This can be used to provide domain-specific features that are only known between certain input methods and their clients. Note that because the InputConnection protocol is asynchronous, you have no way to get a result back or know if the client understood the command; you can use the information in EditorInfo to determine if a client supports a particular command.

reportFullscreenMode

boolean reportFullscreenMode (boolean enabled)

Called by the IME to tell the client when it switches between fullscreen and normal modes. This will normally be called for you by the standard implementation of InputMethodService.

requestCursorUpdates

boolean requestCursorUpdates (int cursorUpdateMode)

Called by the input method to ask the editor for calling back updateCursorAnchorInfo(android.view.View, CursorAnchorInfo) to notify cursor/anchor locations.

sendKeyEvent

boolean sendKeyEvent (KeyEvent event)

Send a key event to the process that is currently attached through this input connection. The event will be dispatched like a normal key event, to the currently focused view; this generally is the view that is providing this InputConnection, but due to the asynchronous nature of this protocol that can not be guaranteed and the focus may have changed by the time the event is received.

This method can be used to send key events to the application. For example, an on-screen keyboard may use this method to simulate a hardware keyboard. There are three types of standard keyboards, numeric (12-key), predictive (20-key) and ALPHA (QWERTY). You can specify the keyboard type by specify the device id of the key event.

You will usually want to set the flag KeyEvent.FLAG_SOFT_KEYBOARD on all key event objects you give to this API; the flag will not be set for you.

Note that it's discouraged to send such key events in normal operation; this is mainly for use with TYPE_NULL type text fields. Use the commitText(CharSequence, int) family of methods to send text to the application instead.

setComposingRegion

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 updateSelection(View, int, int, int, int) and IMEs should not receive 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.

setComposingText

boolean setComposingText (CharSequence text, 
                int newCursorPosition)

Replace the currently composing text with the given text, and set the new cursor position. Any composing text set previously will be removed automatically.

If there is any composing span currently active, all characters that it comprises are removed. The passed text is added in its place, and a composing span is added to this text. If there is no composing span active, the passed text is added at the cursor position (removing selected characters first if any), and a composing span is added on the new text. Finally, the cursor is moved to the location specified by newCursorPosition.

This is usually called by IMEs to add or remove or change characters in the composing span. Calling this method will cause the editor to call onUpdateSelection(int, int, int, int, int, int) on the current IME after the batch input is over.

Editor authors: please keep in mind the text may be very similar or completely different than what was in the composing span at call time, or there may not be a composing span at all. Please note that although it's not typical use, the string may be empty. Treat this normally, replacing the currently composing text with an empty string. Also, be careful with the cursor position. IMEs rely on this working exactly as described above. Since this changes the contents of the editor, you need to make the changes known to the input method by calling updateSelection(View, int, int, int, int), but be careful to wait until the batch edit is over if one is in progress. Note that this method can set the cursor position on either edge of the composing text or entirely outside it, but the IME may also go on to move the cursor position to within the composing text in a subsequent call so you should make no assumption at all: the composing text and the selection are entirely independent.

setSelection

boolean setSelection (int start, 
                int end)

Set the selection of the text editor. To set the cursor position, start and end should have the same value.

Since this moves the cursor, calling this method will cause the editor to call onUpdateSelection(int, int, int, int, int, int) on the current IME after the batch input is over. Editor authors, for this to happen you need to make the changes known to the input method by calling updateSelection(View, int, int, int, int), but be careful to wait until the batch edit is over if one is in progress.

This has no effect on the composing region which must stay unchanged. 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.

setTarget

void setTarget (InputConnection target)

Change the target of the input connection.

Caveat: Although the system can accept (InputConnection) null in some places, you cannot emulate such a behavior by non-null InputConnectionWrapper that has null in target.