Question

如何使用recyclerview实现滚动功能。找到下面的代码片段。

quiztab.xml

  <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/quiz_layout"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent" android:orientation="vertical"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</RelativeLayout>

quiztab_mcq.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp">

        <LinearLayout
            android:id="@+id/mcq"
            android:orientation="vertical"
            android:layout_marginTop="@dimen/activity_horizontal_margin"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </LinearLayout>

        <LinearLayout
           android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center">

            <Button
                android:layout_width="120dp"
                android:layout_height="wrap_content"
                android:text="Submit"
                android:id="@+id/submitButton"
                android:textSize="18sp"
                android:textColor="@color/colorWhite"
                android:textAllCaps="false"
                android:background="@color/colorPrimary"/>

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

QuizTab.java

@SuppressLint("ValidFragment")
public class QuizTab extends Fragment {
    private static final String TAG = "QuizTab";
    RecyclerView recyclerView;
    View view;
    LinearLayout linearLayout;
    List<Integer> usr_opts;
    RadioGroup rg;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.quiztab, container, false);
        recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        getQuizContent();
        setupRecyclerView(recyclerView);
        return view;
    }

    private void setupRecyclerView(RecyclerView recyclerView) {
        recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext()));
        recyclerView.setAdapter(new SimpleStringRecyclerViewAdapter(getActivity(),
                VersionModel.data));
    }

    public class SimpleStringRecyclerViewAdapter extends RecyclerView.Adapter<SimpleStringRecyclerViewAdapter.ViewHolder> {
        private String[] mValues;
        private Context mContext;

        public class ViewHolder extends RecyclerView.ViewHolder {
            public final LinearLayout mLinearlayout;
            public ViewHolder(View view) {
                super(view);
                mLinearlayout = (LinearLayout) view.findViewById(R.id.mcq);
            }

        }

        public String getValueAt(int position) {
            return mValues[position];
        }
        public SimpleStringRecyclerViewAdapter(Context context, String[] items) {
            mContext = context;
            mValues = items;
        }

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.quiztab_mcq, parent, false);
            return new ViewHolder(view);
        }

        @Override
        public void onBindViewHolder(final ViewHolder holder, final int position) {
 holder.mLinearlayout.addView(rg);

            }

        }
        @Override
        public int getItemCount() {
            return 1;
        }
    }
}

上面我试图将quiztab_mcq.xml扩展到quiztab.xml，但页面上的内容不可滚动。我的提交按钮在较小尺寸的手机上不可见。它适用于5.5英寸手机，但尺寸不小。

Answer 1

尝试更改

@Override
public int getItemCount() {
    return 1;
}

到

@Override
public int getItemCount() {
    return mValues.length;
}

更新：正如NileshRathod在下面的评论中提到的那样，LinearLayout中android:layout_height="wrap_content"根<{1}}的高度应该是android:layout_height="match_parent"而不是quiztab_mcq.xml。

此外，关于重复：您将拥有它多次，因为您的mValues中有许多项目，因为您的RecyclerView正在创建其长度大小的列表。

更新：如果要显示内容，则无需在回收站视图中显示。 RecyclerView是列表项的容器，但如果您的内容高度超过屏幕高度，则可以使用简单的ScrollView或NestedScrollView。然后你的内容不会重复，并且可以滚动到它的结尾。

无法使用回收站视图滚动数据

1 个答案: