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我的场景是单击按钮，我需要打开一个半展开的底页，当我们向上拖动它时，它的行为应该像折叠工具栏。

这里 Appbar 的行为与 bottomsheet 同步，但 NestedScrollview 的行为仅与 Collasping 工具栏同步，而不与 Bottomsheet 的行为同步。

当我在 NestedScrollview 上滚动时，它只是扩展和折叠工具栏，而不是 BottomSheet。

下面是底页布局：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:fitsSystemWindows="true"
    android:layout_width="match_parent"
    android:elevation="@dimen/design_appbar_elevation"
    android:layout_height="match_parent"
    app:layout_behavior="@string/bottom_sheet_behavior"

    app:behavior_hideable="true"

    >

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:fitsSystemWindows="true"
        android:layout_height="192dp"
        android:layout_width="match_parent"

        >

        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:toolbarId="@+id/toolbar"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
            android:fitsSystemWindows="true"

            app:contentScrim="?attr/colorPrimary">

            <ImageView
                android:id="@+id/app_bar_image"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_collapseMode="parallax"
                android:src="@drawable/ic_launcher_background"
                android:scaleType="centerCrop" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_height="?attr/actionBarSize"
                android:layout_width="match_parent">


            </android.support.v7.widget.Toolbar>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none"

        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        >

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="300dp">

            <EditText
                android:id="@+id/editText"
                android:layout_width="222dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_marginEnd="8dp"
                android:ems="10"
                android:inputType="textPersonName"
                android:text="Name"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <EditText
                android:id="@+id/editText2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:ems="10"
                android:inputType="textPersonName"
                android:text="Name"
                app:layout_constraintEnd_toEndOf="@+id/editText"
                app:layout_constraintStart_toStartOf="@+id/editText"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <EditText
                android:id="@+id/editText3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:ems="10"
                android:inputType="textPersonName"
                android:text="Name"
                app:layout_constraintEnd_toEndOf="@+id/editText2"
                app:layout_constraintStart_toStartOf="@+id/editText2"
                app:layout_constraintTop_toBottomOf="@+id/editText2" />

            <EditText
                android:id="@+id/editText4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:ems="10"
                android:inputType="textPersonName"
                android:text="Name"
                app:layout_constraintEnd_toEndOf="@+id/editText3"
                app:layout_constraintStart_toStartOf="@+id/editText3"
                app:layout_constraintTop_toBottomOf="@+id/editText3" />

            <EditText
                android:id="@+id/editText5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:ems="10"
                android:inputType="textPersonName"
                android:text="Name"
                app:layout_constraintEnd_toEndOf="@+id/editText4"
                app:layout_constraintStart_toStartOf="@+id/editText4"
                app:layout_constraintTop_toBottomOf="@+id/editText4" />

            <EditText
                android:id="@+id/editText6"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:ems="10"
                android:inputType="textPersonName"
                android:text="Name"
                app:layout_constraintEnd_toEndOf="@+id/editText5"
                app:layout_constraintStart_toStartOf="@+id/editText5"
                app:layout_constraintTop_toBottomOf="@+id/editText5" />
        </android.support.constraint.ConstraintLayout>
    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

源代码的 Github 链接

下面是 MainActivity 代码：

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.constraint.ConstraintLayout;
import android.support.design.widget.BottomSheetBehavior;
import android.support.design.widget.BottomSheetDialogFragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    @BindView(R.id.toolbar)
    Toolbar toolbar;
    private BottomSheetBehavior mBottomSheetBehavior;
    @BindView(R.id.mine)
    ConstraintLayout mine;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        setSupportActionBar(toolbar);
        toolbar.setTitle(getResources().getString(R.string.app_name));

        View bottomSheet = findViewById(R.id.bottom_sheet);
        mBottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
        mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
        mBottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View bottomSheet, int newState) {
                switch (newState) {
                    case BottomSheetBehavior.STATE_COLLAPSED:
                        Log.d(TAG, "State Collapsed");
                        break;
                    case BottomSheetBehavior.STATE_DRAGGING:
                        Log.d(TAG, "State Dragging");
                        break;
                    case BottomSheetBehavior.STATE_EXPANDED:
                        Log.d(TAG, "State Expanded");
                        break;
                    case BottomSheetBehavior.STATE_HIDDEN:
                        Log.d(TAG, "State Hidden");
                        break;
                    case BottomSheetBehavior.STATE_SETTLING:
                        Log.d(TAG, "State Settling");
                        break;
                }
            }

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

    }

    @OnClick(R.id.click)
    public void click() {
        BottomSheetDialogFragment bottomSheetDialogFragment = new CustomBottomSheetDialogFragment();
        bottomSheetDialogFragment.show(getSupportFragmentManager(), bottomSheetDialogFragment.getTag());
    }
}

下面是 MainActivity 布局文件：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"/>

    </android.support.design.widget.AppBarLayout>

    <android.support.constraint.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:id="@+id/mine"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/click"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:text="Button"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />


    </android.support.constraint.ConstraintLayout>    <!-- Bottom Sheet Dialog Content @set app:layout_behavior = "android.support.design.widget.BottomSheetBehavior" -->
    <android.support.v4.widget.NestedScrollView
        android:id="@+id/bottom_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#EEEEEE"
        android:clipToPadding="true"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior">


    </android.support.v4.widget.NestedScrollView>

</android.support.design.widget.CoordinatorLayout>

下面是 CustomBottomSheetDialogFragment ：

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.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.view.View;
import android.widget.TextView;

public class CustomBottomSheetDialogFragment  extends BottomSheetDialogFragment {
    private TextView mOffsetText;
    private TextView mStateText;
    private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {

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

        }

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


    private LinearLayoutManager mLinearLayoutManager;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return super.onCreateDialog(savedInstanceState);
    }

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


//
//        recyclerView.setLayoutManager(mLinearLayoutManager);
//        recyclerView.setAdapter(mAdapter);
    }

    @Override
    public void setupDialog(Dialog dialog, int style) {
        super.setupDialog(dialog, style);
        View contentView = View.inflate(getContext(), R.layout.bottomsheetcontent, null);
        dialog.setContentView(contentView);
        CoordinatorLayout.LayoutParams layoutParams =
                (CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams();
        CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();
        if (behavior != null && behavior instanceof BottomSheetBehavior) {
            ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
        }

    }


    private void setOffsetText(final float slideOffset) {

    }

    private void setStateText(int newState) {
    }
}

NestedScrollview 中的 Bootomsheet 滚动行为问题

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