一、簡介
Bottom Sheet是Design Support Library23.2 版本引入的一個類似於對話框的控件。 Bottom Sheet中的內容默認是隱藏起來的,只顯示很小一部分,可以通過在代碼中設置其狀態或者手勢操作將其完全展開,或者完全隱藏,或者部分隱藏。
二、使用
1、添加依賴:
implementation 'com.android.support:design:28.0.0'
2、佈局
<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.amap.api.maps.MapView
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<RelativeLayout
android:id="@+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/height52px"
app:behavior_hideable="false"
app:behavior_peekHeight="@dimen/height84px"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
tools:ignore="MissingPrefix"
android:background="#ffffffff"
>
<include layout="@layout/bottom_sheet" />
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
<?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="@dimen/height216px"
>
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:gravity="center"
android:text="bottom_sheet_peek" />
</RelativeLayout>
3、代碼實現
//底部抽屜欄展示地址
mBehavior = BottomSheetBehavior.from(mRelativeLayout);
mBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, @BottomSheetBehavior.State int newState) {
String state = "null";
switch (newState) {
case 1:
state = "STATE_DRAGGING";//過渡狀態此時用戶正在向上或者向下拖動bottom sheet
break;
case 2:
state = "STATE_SETTLING"; // 視圖從脫離手指自由滑動到最終停下的這一小段時間
break;
case 3:
state = "STATE_EXPANDED"; //處於完全展開的狀態
break;
case 4:
state = "STATE_COLLAPSED"; //默認的摺疊狀態
break;
case 5:
state = "STATE_HIDDEN"; //下滑動完全隱藏 bottom sheet
break;
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
Log.i("BottomSheetDemo", "slideOffset:" + slideOffset);
}
});
4、幾個屬性含義:
// behavior_hideable:定義是否能通過下滑手勢收起Bottom Sheet。
app:behavior_hideable="true"
// behavior_peekHeight:定義可見部分的高度。
app:behavior_peekHeight="80dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
5、BottomSheet的五種狀態:
STATE_DRAGGING:手指在BottomSheet上下拖動從而使得佈局跟着上下移動
STATE_SETTLING:當手指擡起之後,會根據當前的偏移量,決定是要將BottomSheet收起還是展開
這兩種屬於中間態,類似於ViewPager的SCROLL_STATE_DRAGGING和SCROLL_STATE_SETTLING
--------------------------------------
STATE_EXPANDED:展開
STATE_COLLAPSED:收起
STATE_HIDDEN:隱藏
三、封裝的框架推薦