Question

更新：

当片段中的recyclerview中实际上没有显示任何内容时，我想显示“列表中没有项目”。这就是我想要的：

在我的片段中：

// Drawing the square
   var width = 0,
       height = 0,
       widthValue = document.getElementById('wid'),
       heightValue = document.getElementById('hgt');

      widthValue.value = width;
      heightValue.value = height;

      widthValue.addEventListener("change", function () {
         width = this.value;
      }, false);
      heightValue.addEventListener("change", function () {
         height = this.value;
      }, false);

      function draw() {
         context.clearRect(0, 0, canvas.width, canvas.height);
         context.rect(0, 0, width, height);
         context.fillStyle = "#EA7B00";
         context.fill();
      }

在我的片段的java文件中：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0"
android:animateLayoutChanges="true">

<android.support.v7.widget.RecyclerView
    android:id="@+id/assigned_recycler"
    android:scrollbars="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="50dp"
    android:background="#f0f0f0"
    android:animationCache="true"
    android:animateLayoutChanges="false" />

<TextView
    android:id="@+id/empty_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:visibility="gone"
    android:text="@string/no_data_available" />

我在这里错过了什么吗？

还需要对我的布局代码和颜色做些什么吗？

Answer 1

请在onCreateView，

中尝试以下代码

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_assigned_orders, container, false);

        mRecyclerView = (RecyclerView) rootView.findViewById(R.id.assigned_recycler);

        mRecyclerView.setHasFixedSize(true);

        mLayoutManager = new LinearLayoutManager(this.getContext());
        mRecyclerView.setLayoutManager(mLayoutManager);


        Toolbar toolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);
        toolbar.setTitle("Assigned");
        emptyViewText = (TextView)rootView.findViewById(R.id.empty_view);

        if(orderService.getAssignedOrders().size() != 0) {
            mRecyclerView.setVisibility(View.VISIBLE);
            emptyViewText.setVisibility(View.GONE);
            mAdapter = new AssignedOrdersListAdapter(orderService.getAssignedOrders());
            mAdapter.setManager(getFragmentManager());
            mRecyclerView.setAdapter(mAdapter);
        } else {
            mRecyclerView.setVisibility(View.GONE);
            emptyViewText.setVisibility(View.VISIBLE);
        }

        new LegDistanceTask().execute("");
        return rootView;
    }

上述代码将检查从服务接收的列表是否为空，并相应地显示组件。

您应该检查列表大小以确定，而不是适配器计数。

回收视图不会消失

1 个答案: