Baserecyclerviewadapterhelper: recyclerview嵌套在NestedScrollView里，一次性加载出全部数据问题

Created on 23 Jan 2018 · 5Comments · Source: CymChad/BaseRecyclerViewAdapterHelper

recyclerview嵌套在NestedScrollView里，一次性加载出全部数据问题。
因为要实现向上滑动时toolbar悬停在顶部的那种效果，所以recyclerview必须嵌套在NestedScrollView里。

作者给出的两种解决方法：
1.将嵌套部分的布局当作头部和尾部添加到rv上面或下面，去除ScrollView。
2.更换第三发的嵌套的上拉下拉控件。

第一种直接不可取，第二种就是要抛弃这个开源库的意思^_^

同时这个问题可以参考已关闭的issues #1821

Source

chailijun

Most helpful comment

@chailijun 可以的
public class MainActivity extends AppCompatActivity implements BaseQuickAdapter.RequestLoadMoreListener, SwipeRefreshLayout.OnRefreshListener {

private final String TAG = "MainActivity";
private RecyclerView recyclerView;
private NestedScrollView scrollView;
private SwipeRefreshLayout swipe;

private List<String> list = new ArrayList<>();
private TestAdapter testAdapter;

private boolean enableLoadMore = true;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initUI();
    onRefresh();
}

private void initUI() {
    recyclerView = (RecyclerView) findViewById(R.id.recycler);
    scrollView = (NestedScrollView) findViewById(R.id.scrollView);
    swipe = (SwipeRefreshLayout) findViewById(R.id.swipe);
    swipe.setOnRefreshListener(this);

    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this) {
        @Override
        public boolean canScrollVertically() {
            return false;
        }
    };

    linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(linearLayoutManager);
    recyclerView.addItemDecoration(new DividerItemDecoration(getApplicationContext(),DividerItemDecoration.VERTICAL));

    recyclerView.setNestedScrollingEnabled(false);

    scrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
        @Override
        public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {

            if (scrollY > oldScrollY) {
                Log.i(TAG, "Scroll DOWN");
            }
            if (scrollY < oldScrollY) {
                Log.i(TAG, "Scroll UP");
            }

            if (scrollY == 0) {
                Log.i(TAG, "TOP SCROLL");
            }

            if (scrollY == (v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight())) {
                Log.i(TAG, "BOTTOM SCROLL");
                if(enableLoadMore) {
                    onLoadMoreRequested();
                }


            }
        }
    });


    testAdapter = new TestAdapter(R.layout.item,list);

// testAdapter.setOnLoadMoreListener(this,recyclerView);
recyclerView.setAdapter(testAdapter);
}

@Override
public void onLoadMoreRequested() {
    Log.i(TAG, "onLoadMoreRequested");
    enableLoadMore = false;
    testAdapter.addFooterView(getLayoutInflater().inflate(R.layout.footer,(ViewGroup) recyclerView.getParent(),false));

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            testAdapter.addData(loadData());
            testAdapter.removeAllFooterView();
            enableLoadMore = true;
        }
    },1500);
}

private List<String> loadData() {
    List<String> mList = new ArrayList<>();
    for (int i = 0;i<5;i++) {
        mList.add("test");
    }

    return  mList;
}

@Override
public void onRefresh() {
    list=  loadData();
    testAdapter.setNewData(list);
    swipe.setRefreshing(false);
}

}

activity_main.xml

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
tools:context="com.test.netrec.MainActivity">

<android.support.v4.widget.SwipeRefreshLayout
    android:id="@+id/swipe"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.NestedScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:gravity="center"
                android:text="自定义布局1" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1px"
                android:background="#d1d1d1" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:gravity="center"
                android:text="自定义布局2" />

            <View
                android:layout_width="match_parent"
                android:layout_height="1px"
                android:background="#d1d1d1" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:descendantFocusability="blocksDescendants">

                <android.support.v7.widget.RecyclerView
                    android:id="@+id/recycler"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />

            </RelativeLayout>

        </LinearLayout>

    </android.support.v4.widget.NestedScrollView>
</android.support.v4.widget.SwipeRefreshLayout>

footer.xml

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#fff"
tools:context="com.test.netrec.MainActivity">

<LinearLayout
    android:orientation="horizontal"
    android:layout_centerInParent="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

<ProgressBar
    android:layout_centerInParent="true"
    android:layout_width="20dp"
    android:layout_height="20dp" />

    <TextView
        android:textSize="12sp"
        android:textColor="@android:color/black"
        android:layout_marginLeft="8dp"
        android:text="数据加载中..."
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

item.xml

xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#fff"
android:textColor="#f00"
android:text="item"
android:textSize="20sp"
android:gravity="center"
tools:context="com.test.netrec.MainActivity">

AngelBo on 25 Jan 2018

👍5

All 5 comments