按下后退按钮时如何关闭片段？

Question

I have an activity wherein if i click the "BUY" button, it will open a fragment about (150x150 pixels) to ask for the "quantity". If the user will press the back button, it will just simply close the fragment. Any Ideas about closing the fragment?

Answer 1

You don't need to do it in a fragment it's too much for this simple use, i suggest you to use a PopupWindow:

When you click on Buy Button, you show the popup.

PopupWindow is enough customizable to make your layout as you want

here an example : https://android--code.blogspot.com/2016/01/android-popup-window-example.html

Answer 2

如果您确实要使用Fragment而不是按照建议的对话框并要删除它，请在创建它时保留对其的引用，然后使用getFragmentManager().beginTransaction().remove(fragment).commit() （也可以detach如果您只想将其与活动分离而不是将其完全销毁，则可以将其移除。

Answer 3

Use popbackstack on backpress of activty by overriding it.

@Override
public void onBackPressed() {
    if (getFragmentManager().getBackStackEntryCount() > 0) {
        getFragmentManager().popBackStack();
    } else {
        super.onBackPressed();
    }
}