Question

我正在片段中使用Recyclerview ... 在片段内部，我通过以下方式设置GridLayout：

myTV.setLayoutManager(new GridLayoutManager(getActivity(),3));

代码说， 横向和纵向模式仅3列 。

但是我希望最大列数以适合用户在旋转手机/平板电脑时使用的屏幕。...

这是我的PeopleFragment.java

public class PeopleFragment extends Fragment {
    View v;
        List<People> listPeople;
        @Override
        public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            v= inflater.inflate(R.layout.fragment_people,container,false);

            listPeople = new ArrayList<>();

            listPeople.add(new People("1-name",R.drawable.image1));
            listPeople.add(new People("2-name",R.drawable.image2));
            listPeople.add(new People("3-name",R.drawable.image3));
            listPeople.add(new People("4-name",R.drawable.image4));
            listPeople.add(new People("5-name",R.drawable.image5));
            listPeople.add(new People("6-name",R.drawable.image6));
            listPeople.add(new People("7-name",R.drawable.image7));

            RecyclerView myTV= (RecyclerView) v.findViewById(R.id.recyclerview_id);
            RecyclerViewAdapterPDF myAdapter = new RecyclerViewAdapterPDF(getActivity(),listPeople);
            myTV.setLayoutManager(new GridLayoutManager(getActivity(),3));
            myTV.setAdapter(myAdapter);

            return v;
      }
    }

fragment_people.java

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

我使用了 android：numColumns =“ auto_fit” 。但我没有工作。...

您能告诉我如何解决此问题吗？这是另一个问题...

Answer 1

Check this for better solution

您可以在此处创建一个用于返回no of columns的类，也可以直接使用方法。

将此方法添加到片段类。

public int calculateNoOfColumns(Context context) {
    DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
    float dpWidth = displayMetrics.widthPixels / displayMetrics.density;
    int noOfColumns = (int) (dpWidth / 180);
    return noOfColumns;
}

并将您的适配器代码更改为

myTV.setLayoutManager(new GridLayoutManager(getActivity(),calculateNoOfColumns(getActivity())));

使用GridLayoutManager和RecyclerView为自动调整屏幕更改列数

1 个答案: