TextView.java 文件源码

private void setKeyListenerOnly(KeyListener input) {
    if (mEditor == null && input == null) return; // null is the default value

    createEditorIfNeeded();
    if (mEditor.mKeyListener != input) {
        mEditor.mKeyListener = input;
        if (input != null && !(mText instanceof Editable)) {
            setText(mText);
        }

        setFilters((Editable) mText, mFilters);
    }
}