Android BottomsheetFragment Viewpager Fragment没有视图

Question

我正在尝试在bottomsheetFragment内部实现一个viewpager，但由于viewpager位于nestedScrollview内部，因此它似乎不可见。

下面是打开bottomsheetFragment的代码

        BottomSheetDialogFragment bottomSheetDialogFragment = new CustomBottomSheetDialogFragment();

        bottomSheetDialogFragment.show(((MyActivity)context).getSupportFragmentManager(), bottomSheetDialogFragment.getTag());

这是从recylerview项目单击触发的功能

下面是CustomBottomSheet Fragment类：

import android.app.Dialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.BottomSheetBehavior;
import android.support.design.widget.BottomSheetDialogFragment;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.widget.LinearLayoutManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

import sales.talentify.ai.aitalentifysales.R;
import sales.talentify.ai.aitalentifysales.landing.adapter.AddLeadAdapter;
import sales.talentify.ai.aitalentifysales.salespojo.Lead;

public class CustomBottomSheetDialogFragment extends BottomSheetDialogFragment {
    public static final String DATA="data";
    Lead lead;
    private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {

        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                dismiss();
            }

        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    };


    private LinearLayoutManager mLinearLayoutManager;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        lead =(Lead) getArguments().getSerializable(DATA);

        return super.onCreateDialog(savedInstanceState);


    }

    @Override
    public void onViewCreated(View contentView, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(contentView, savedInstanceState);


    }

    @Override
    public void setupDialog(Dialog dialog, int style) {
        super.setupDialog(dialog, style);
        View view = View.inflate(getContext(), R.layout.include_modal_content, null);

        EditText company_name = view.findViewById(R.id.company_name);
        Spinner lead_source = view.findViewById(R.id.lead_source);
        EditText address = view.findViewById(R.id.address);
        EditText state = view.findViewById(R.id.state);
        EditText country = view.findViewById(R.id.country);
        EditText city = view.findViewById(R.id.city);
        EditText pincode = view.findViewById(R.id.pincode);
        Button lead_submit = view.findViewById(R.id.lead_submit);
        TextView company_title = view.findViewById(R.id.company_title);
        final Button company_button = view.findViewById(R.id.company_button);
        company_title.setText(lead.getCompanyName());






        dialog.setContentView(view);

        ViewPager viewPager = view.findViewById(R.id.sales_viewpager);

        AddLeadAdapter addLeadAdapter = new AddLeadAdapter(getChildFragmentManager(),lead);
        viewPager.setAdapter(addLeadAdapter);
        CoordinatorLayout.LayoutParams layoutParams =
                (CoordinatorLayout.LayoutParams) ((View) view.getParent()).getLayoutParams();
        CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();
        if (behavior != null && behavior instanceof BottomSheetBehavior) {
            ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
        }

    }



}

下面是include_modal_content布局文件

 <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout 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"
        xmlns:tools="http://schemas.android.com/tools"
        android:orientation="vertical"
        android:id="@+id/main_layout"
        >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="true"
            android:id="@+id/toolbar"
            android:foreground="?attr/selectableItemBackground"
            android:orientation="horizontal"
            android:paddingBottom="8dp"
            android:paddingLeft="18dp"
            android:paddingRight="18dp"
            android:paddingTop="8dp"
            android:background="@drawable/input_shape"
            android:focusable="true">

            <Button
                android:id="@+id/company_button"
                android:layout_width="35dp"
                android:layout_height="35dp"
                android:layout_marginStart="16dp"
                android:layout_marginEnd="8dp"
                android:background="@drawable/circle_button_solid"
                android:text="#"

                android:textColor="@color/white"
                />

            <TextView
                android:id="@+id/company_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:maxLines="1"
                android:ellipsize="end"
                android:textSize="@dimen/h6"
                app:fontFamily="@font/lato"
                android:text="Email a Copy"
                android:textColor="@color/black_theme_text"
            />

        </LinearLayout>

       <include layout="@layout/myinclude"/>
        <Button

            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/lead_submit"
            android:background="@color/theme_color"
            android:text="Save Lead"
            android:textColor="@color/white"
            android:fontFamily="@font/lato"
            android:textSize="@dimen/p1"

            android:layout_alignParentBottom="true"/>
    </RelativeLayout>



 myinclude is included layout which contains nestedscrollview and viewpager as :


 <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout 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"
        xmlns:tools="http://schemas.android.com/tools"
        android:orientation="vertical"
        android:id="@+id/main_layout"
        >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="true"
            android:id="@+id/toolbar"
            android:foreground="?attr/selectableItemBackground"
            android:orientation="horizontal"
            android:paddingBottom="8dp"
            android:paddingLeft="18dp"
            android:paddingRight="18dp"
            android:paddingTop="8dp"
            android:background="@drawable/input_shape"
            android:focusable="true">

            <Button
                android:id="@+id/company_button"
                android:layout_width="35dp"
                android:layout_height="35dp"
                android:layout_marginStart="16dp"
                android:layout_marginEnd="8dp"
                android:background="@drawable/circle_button_solid"
                android:text="#"

                android:textColor="@color/white"
                />

            <TextView
                android:id="@+id/company_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:maxLines="1"
                android:ellipsize="end"
                android:textSize="@dimen/h6"
                app:fontFamily="@font/lato"
                android:text="Email a Copy"
                android:textColor="@color/black_theme_text"
            />

        </LinearLayout>

       <include layout="@layout/edit_lead"/>
        <Button

            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/lead_submit"
            android:background="@color/theme_color"
            android:text="Save Lead"
            android:textColor="@color/white"
            android:fontFamily="@font/lato"
            android:textSize="@dimen/p1"

            android:layout_alignParentBottom="true"/>
    </RelativeLayout>

请帮助我如何解决此nestedscrollview中的viewpager。

我遇到以下异常：

  java.lang.IllegalStateException: Fragment does not have a view
        at android.support.v4.app.Fragment$2.onFindViewById(Fragment.java:2391)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1444)
        at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802)
        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2243)
        at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:654)
        at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:168)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:1244)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:1092)
        at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1622)
        at android.view.View.measure(View.java:23169)
        at android.support.constraint.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java:1227)
        at android.support.constraint.ConstraintLayout.onMeasure(ConstraintLayout.java:1572)
        at android.view.View.measure(View.java:23169)
        at android.support.v4.widget.NestedScrollView.measureChildWithMargins(NestedScrollView.java:1502)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)

Answer 1

使用onCreateView(..)而非setupDialog(...)来设置BottomSheetDialogFragment的用户界面。像下面一样

@Override
public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.include_modal_content, container,
                false);

        // get the views and attach the listener

        return view;
    }

Answer 2

我不知道上面的答案是如何得到预期的，因为它遗漏了非常重要的细节。在onCreateView方法中不能直接附加bottomSheetBehavior和bottomSheetCallback。

改为覆盖 onStart：

override fun onStart() {
        super.onStart()
        bottomSheet =
            dialog!!.findViewById(com.google.android.material.R.id.design_bottom_sheet) as ViewGroup // notice the R root package
        bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet) 
        // SETUP YOUR BEHAVIOR HERE AND ADD THE BOTTOMSHEETCALLBACK HERE

然后如上所述覆盖 onCreateView

@Override
public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.include_modal_content, container,
                false);

        // get the views and attach the listener

        return view;
    }