Fragment使用方法及嵌套recycle时注意事项

使用方法

首先创建一个继承Fragment类
然后需要重写两个方法
onCreateView()方法 在此方法内绑定该fragment要显示的item

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_feed_main, container, false);
        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

主Activity
需要先实例化fragment然后在指定添加在哪（R.id.fram_1）

public class MainActivity extends AppCompatActivity {

    private FeedMainFragment FeedMainFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FeedMainFragment = new FeedMainFragment(); // 实例化Fragment

        getSupportFragmentManager().beginTransaction().add(R.id.fram_1, FeedMainFragment,"").commitAllowingStateLoss(); // 将fragment添加到activity
        
    }
}

activity对应的xml

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

   <Button
       android:id="@+id/btn_like"
       android:layout_width="wrap_content"
       android:layout_height="40dp"
       android:text="关注"

       />
   <FrameLayout
       android:id="@+id/fram_1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_below="@id/btn_like"
       />


</RelativeLayout>

Fragment嵌套RecycleView

需要在fragment中绑定相应adapter

 public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_feed_main, container, false);


        mRvMain = view.findViewById(R.id.rv_main);
        mRvMain.setLayoutManager(new LinearLayoutManager(view.getContext()));
        // 设置页面排列为垂直方向
        mAdapter = new FeedAdapter(feedVideoList, feedImageList, view.getContext());
        mRvMain.setAdapter(mAdapter);

        return view;