How To Implement Android Fragment Transaction .add Syntax Error

I'm would like to make my Android application use Fragment Transactions, so that I can switch between various Fragments display their associated lists. My application worked fine

Solution 1:

If you are already using the add method of FragmentTransaction you must not include the <fragment tag in your layout. What if you just left your main activity XML like this:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

Solution 2:

In chapterFragment.java change your import

import android.app.Fragment

To

import android.support.v4.app.Fragment