TextInputLayout密码切换监听器

Question

我有一个TextInputLayout用于密码。我添加了passwordToggleEnabled = true来切换密码可见性。当用户切换密码可见性时，我需要捕获事件。我怎样才能做到这一点。

<android.support.design.widget.TextInputLayout
    android:id="@+id/password_input_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="start|center"
    app:passwordToggleEnabled="true">

        <android.support.design.widget.TextInputEditText
            android:id="@+id/password_edit_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/enter_new_password"
            android:inputType="textPassword"/>

</android.support.design.widget.TextInputLayout>

Answer 1

在TextInputLayout的源代码中，切换按钮的视图类型是CheckableImageButton。您只需要在TextInputLayout View的子项上找到递归迭代的视图。然后setOnTouchListener。

View togglePasswordButton = findTogglePasswordButton(mTextInputLayoutView);
if (togglePasswordButton != null) {
    togglePasswordButton.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
            // implementation
            return false;
        }
    });
}

private View findTogglePasswordButton(ViewGroup viewGroup) {
    int childCount = viewGroup.getChildCount();
    for (int ind = 0; ind < childCount; ind++) {
        View child = viewGroup.getChildAt(ind);
        if (child instanceof ViewGroup) {
            View togglePasswordButton = findTogglePasswordButton((ViewGroup) child);
            if (togglePasswordButton != null) {
                return togglePasswordButton;
            }
        } else if (child instanceof CheckableImageButton) {
            return child;
        }
    }
    return null;
}