fragment介绍

Posted 2021-02-02 nangongyibin

fragment介绍 

• fragment总是被嵌入到Activity里 fragment要添加到ViewGroup里 
• fragment是在android3.0的时候被引入的. 
• 代码实现 
  • 在布局声明

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <fragment
        android:id="@+id/fragment1"
        android:name="ngyb.statementfragment.BlankFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <fragment
        android:id="@+id/fragment2"
        android:name="ngyb.statementfragment.BlankFragment2"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />
</LinearLayout>

• • 声明fragment 需要重写onCreateView方法 

public class BlankFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_blank, null);
    }
}