public boolean processKey(
InputConnection inputContext, KeyEvent event, boolean upperCase, boolean realAction) {
if (null == inputContext || null == event) return false;
int keyCode = event.getKeyCode();
CharSequence prefix = null;
prefix = inputContext.getTextBeforeCursor(2, 0);
int keyChar;
keyChar = 0;
if (keyCode >= KeyEvent.KEYCODE_A && keyCode <= KeyEvent.KEYCODE_Z) {
keyChar = keyCode - KeyEvent.KEYCODE_A + 'a';
if (upperCase) {
keyChar = keyChar + 'A' - 'a';
}
} else if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9)
keyChar = keyCode - KeyEvent.KEYCODE_0 + '0';
else if (keyCode == KeyEvent.KEYCODE_COMMA) keyChar = ',';
else if (keyCode == KeyEvent.KEYCODE_PERIOD) keyChar = '.';
else if (keyCode == KeyEvent.KEYCODE_APOSTROPHE) keyChar = '\'';
else if (keyCode == KeyEvent.KEYCODE_AT) keyChar = '@';
else if (keyCode == KeyEvent.KEYCODE_SLASH) keyChar = '/';
if (0 == keyChar) {
mLastKeyCode = keyCode;
String insert = null;
if (KeyEvent.KEYCODE_DEL == keyCode) {
if (realAction) {
inputContext.deleteSurroundingText(1, 0);
}
} else if (KeyEvent.KEYCODE_ENTER == keyCode) {
insert = "\n";
} else if (KeyEvent.KEYCODE_SPACE == keyCode) {
insert = " ";
} else {
return false;
}
if (null != insert && realAction) inputContext.commitText(insert, insert.length());
return true;
}
if (!realAction) return true;
if (KeyEvent.KEYCODE_SHIFT_LEFT == mLastKeyCode
|| KeyEvent.KEYCODE_SHIFT_LEFT == mLastKeyCode) {
if (keyChar >= 'a' && keyChar <= 'z') keyChar = keyChar - 'a' + 'A';
} else if (KeyEvent.KEYCODE_ALT_LEFT == mLastKeyCode) {
}
String result = String.valueOf((char) keyChar);
inputContext.commitText(result, result.length());
mLastKeyCode = keyCode;
return true;
}
private int getSelectionStart(@NotNull InputConnection ic) {
return ic.getTextBeforeCursor(MAX_INT, 0).length();
}