无法看到片段内的底页

Question

我有一个viewpager，里面有几个片段。我想在其中一个片段中添加一个底页。让我们称之为report_fragment。片段和底部工作表的布局为：

<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layoutDirection="rtl">

    <include layout="@layout/report_page_content" />

    <!-- include the bottom sheet -->
    <iclude layout="@layout/report_bottom_sheet_table" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

report_page_content布局

<?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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/report_page_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
    />
</LinearLayout>

底部工作表布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/report_bottom_sheet"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    app:behavior_hideable="true"
    app:behavior_peekHeight="120dp"
    android:background="@color/report_bottom_sheet_bck_color"
    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/white"
        android:gravity="center"
        android:text="@string/daily_bs_tests"
        />
</LinearLayout>

片段的Java代码是：

    public class FragmentReportPage extends Fragment {

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

        // Init other views ....

        // LinearLayout bottomSheetLayout = v.findViewById(R.id.report_bottom_sheet);

        // If i uncomment below line, an exception will arise
        // BottomSheetBehavior bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetLayout);
        // bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);

        return v;
    }

不幸的是，该片段中没有显示底页。我做错了什么？

Answer 1

AndroidHive中的BottomSheet上有一个很棒的教程>

您可以创建一个扩展BottomSheetDialogFragment的类。

public class BottomSheetFragment extends BottomSheetDialogFragment {
    public BottomSheetFragment() {
    // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_bottom_sheet_dialog, container, 
              false);
    }
}
并使用下面的代码进行切换

BottomSheetFragment bottomSheetFragment = new BottomSheetFragment();
bottomSheetFragment.show(getSupportFragmentManager(), bottomSheetFragment.getTag());

Answer 2

在你的gradle中