android EditText獲取光標位置並插入字符刪除字符

1.獲取光標位置   [java]  int index = editText.getSelectionStart();     int index = editText.getSelectionStart(); 2.在光標處插入字符   [java]  int index = editText.getSelectionStart();   Editable editable = editText.getText();   editable.insert(index, "aaaa");     int index = editText.getSelectionStart(); Editable editable = editText.getText(); editable.insert(index, "aaaa");3.刪除光標前字符   [java]  int index = editText.getSelectionStart();   Editable editable = editText.getText();   editable.delete(index-1, index);     int index = editText.getSelectionStart(); Editable editable = editText.getText(); editable.delete(index-1, index);