Question

我有一个带有自定义视图和持久性底部工作表的CoordinatorLayout。我已禁用底部工作表的隐藏，并希望在折叠状态下显示LinearLayout中的顶部视图。为了考虑不同的屏幕尺寸，我会在所有内容布局完成后，在我的活动“onCreate”中动态设置peekHeight。

问题是当活动首次开始时，BottomSheet在一个高度偷看，然后在它再次展开和折叠后，peekHeight似乎已经改变了。有趣的是，它在视觉上看起来像peekHeight添加的是布局活动填充（16dp）。但是，BottomSheetBehavior为两者报告相同的peekHeight。

我为此创建了一个hacky解决方法，但我想知道是否有任何错误。下面是一个gif显示我没有我的解决方法和一个当我使用我的解决方法时。我还包括相关的代码和布局文件。再次，它似乎与我的填充（16dp）直接相关，但我不明白如何解决它。

不使用解决方法：

使用解决方法：

活动：

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.edit_schedule_details_activity);

    final CoordinatorLayout activityLayout =
            (CoordinatorLayout) findViewById(R.id.edit_schedule_details_layout);

    ButterKnife.bind(this);

    // ... removed unrelated logic

    final View bottomSheet = findViewById(R.id.edit_details_sheet);

    final LinearLayout peekContainer = (LinearLayout) findViewById(R.id.info_title_container);
    activityLayout
            .getViewTreeObserver()
            .addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            // Set the measured peek height and add in 16 dps to account for inconsistency
            // Adding the 16 dps is part of the workaround
            bottomSheetBehavior.setPeekHeight(peekContainer.getHeight());
                    //+ (int) (16 * getResources().getDisplayMetrics().density)); /* workaround */
            Timber.i("Title height: " + bottomSheetBehavior.getPeekHeight());
            bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
        }
    });

    bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);

            bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(View bottomSheet, int newState) {
            String stateString = "";
            if (newState == BottomSheetBehavior.STATE_EXPANDED) {
                stateString = "Expanded";

                /* workaround */
                /*if(!bottomSheetSet){

                    // remove the extra 16 dp added since the layout now looks correct
                    bottomSheetBehavior
                            .setPeekHeight(
                                    bottomSheetBehavior.getPeekHeight()
                                            - (int) (16 * getResources().getDisplayMetrics().density));
                    bottomSheetSet = true;
                }*/
            }
            else if (newState == BottomSheetBehavior.STATE_COLLAPSED) {
                stateString = "Collapsed";
                Timber.i("peekHeight = " + bottomSheetBehavior.getPeekHeight());
            }
            else if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                stateString = "Hidden";
            }
            else if(newState == BottomSheetBehavior.STATE_SETTLING) {
                stateString = "Settling";
            }
            else if(newState == BottomSheetBehavior.STATE_DRAGGING){
                stateString = "Dragging";
            }
            Timber.i("bottomSheetState = " + stateString);
        }

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

        }

    }); 

}

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"
    android:id="@+id/edit_schedule_details_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="@dimen/activity_horizontal_margin"
    android:background="#ff171e26">


    <com.cel.cortetcommercial.widget.ring_view.RingView
        android:id="@+id/edit_ringview"
        android:layout_width="match_parent"
        android:layout_height="400dip"
        app:inner_radius="95dip"
        app:outer_radius="130dip"
        app:color="@color/colorSecondaryDark"
        app:is_touchable="true"
        app:text_size="12dip"
        app:tick_length="0dip"
        app:tick_width="0dip"
        android:transitionName="@string/transition_details_to_edit"/>

    <LinearLayout
        android:id="@+id/add_remove_button_container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center"
        app:layout_anchor="@id/edit_ringview"
        app:layout_anchorGravity="bottom">

        <Button
            android:id="@+id/remove_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="-"
            android:layout_gravity="end"/>

        <Button
            android:id="@+id/add_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+"/>

    </LinearLayout>


    <android.support.v4.widget.NestedScrollView
        android:id="@+id/edit_details_sheet"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:clipToPadding="true"
        android:background="@color/colorPrimary"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
        app:behavior_hideable="false">

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

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

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

current_info_sheet：

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:id="@+id/info_title_container">

        <TextView
            android:id="@+id/segment_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/activity_vertical_margin"
            android:layout_marginLeft="@dimen/activity_horizontal_margin"
            android:layout_marginRight="@dimen/activity_horizontal_margin"
            android:text="@string/placeholder"
            android:textAppearance="@android:style/TextAppearance.Material.Headline"
            android:textColor="@color/white"/>

        <TextView
            android:id="@+id/time_remaining"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/activity_horizontal_margin"
            android:layout_marginRight="@dimen/activity_horizontal_margin"
            android:layout_marginBottom="@dimen/activity_vertical_margin"
            android:text="@string/placeholder"
            android:textColor="@color/white"/>

        <Space
            android:layout_width="1dp"
            android:layout_height="16dp"/>

    </LinearLayout>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:textColor="@color/white"
        android:text="@string/luminosity"/>

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"/>

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:textColor="@color/white"
        android:text="@string/color_warmth"/>

    <SeekBar
        android:id="@+id/seekBar2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/activity_vertical_margin"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"/>
</LinearLayout>

Persistent BottomSheet peekHeight和STATE_COLLAPSED无法在Activity start

0 个答案: