android – Even if you replace the Fragment, the previous Fragment remains.

Question: Question:

I'm currently trying to switch screens using Fragment , but when I do transaction.replace , the screen of layout_A and the screen of layout_B are displayed in an overlapping state. Even if I tried transaction.remove and transaction.add , the result was the same. Is Fragment used incorrectly? Where can I fix it to switch screens? I'm sorry, but thank you.

FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_changeMode, new FragmentB());
transaction.addToBackStack(null);
transaction.commit();

layout_A.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        android:id="@+id/fragment_change"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="taro.ghost.fragment.FragmentA"/>

</RelativeLayout>

layout_B.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageButton
        android:id="@+id/btn"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerInParent="true"
        android:background="@drawable/contact" />

</RelativeLayout>

Answer: Answer:

The Fragment specified in the layout XML must not be add or replace .

In this case, layout_A.xml as follows so that FragmentA is added around onCreate() .

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/container">
</RelativeLayout>