android EditText获取光标位置并插入字符删除字符

1.获取光标位置

int index = editText.getSelectionStart();

2.在光标处插入字符

int index = editText.getSelectionStart();
Editable editable = editText.getText();
editable.insert(index, "aaaa");

3.删除光标前字符

int index = editText.getSelectionStart();
Editable editable = editText.getText();
editable.delete(index-1, index);