Material Design系列之BottomSheet详解
Material Design官方文档Sheets: bottom的介绍
简介
BottomSheet可以理解为底部对话框，类似popwindow实现的效果
BottomSheet有两种类型：
一、没有蒙层，可以对没有遮盖住的地方进行操作，类似百度地图查询路线的页面；
图片1
二、有蒙层效果，就是和正常的popwindow使用效果一样了。
图片2
使用
compile 'com.android.support:design:26.0.0-alpha1'
1、BottomSheetBehavior的使用
依赖于CoordinatorLayout和BottomSheetBehavior，需要将底部菜单布局作为CoordinatorLayout的子View，实现简单但不够灵活，适用于底部菜单布局稳定的情况。
<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:orientation="vertical"
tools:context="com.wangshuai.androidui.material.BottomSheetActivity">
<include layout="@layout/content_main" />
<include layout="@layout/content_bottom_sheet" />
</android.support.design.widget.CoordinatorLayout>
content_bottom_sheet布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/ll_content_bottom_sheet"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:behavior_hideable="true"
app:behavior_peekHeight="50dp"
app:layout_behavior="@string/bottom_sheet_behavior"
android:background="@color/white">
<TextView
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="人生若只如初见，何事秋风悲画扇。"
android:textSize="20sp"
android:gravity="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="等闲变却故人心，却道故人心易变。"
android:textSize="20sp"
android:gravity="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="骊山语罢清宵半，泪雨霖铃终不怨。"
android:textSize="20sp"
android:gravity="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="80dp"
android:text="何如薄幸锦衣郎，比翼连枝当日愿。"
android:textSize="20sp"
android:gravity="center"/>
</LinearLayout>
其中app:behavior_hideable="true"表示可以让bottom sheet完全隐藏，默认为false；
app:behavior_peekHeight="60dp"表示当为STATE_COLLAPSED（折叠）状态的时候bottom sheet残留的高度，默认为0。
app:layout_behavior="@string/bottom_sheet_behavior"这个一定要设置，不然起不到效果。
通过BottomSheetBehavior控制content_bottom_sheet布局的显示和隐藏
bottomSheetBehavior = BottomSheetBehavior.from(llContentBottomSheet);
bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
switch (newState) {
case BottomSheetBehavior.STATE_COLLAPSED:
Log.e("Bottom Sheet Behaviour", "STATE_COLLAPSED");
break;
case BottomSheetBehavior.STATE_DRAGGING:
Log.e("Bottom Sheet Behaviour", "STATE_DRAGGING");
break;
case BottomSheetBehavior.STATE_EXPANDED:
Log.e("Bottom Sheet Behaviour", "STATE_EXPANDED");
break;
case BottomSheetBehavior.STATE_HIDDEN:
Log.e("Bottom Sheet Behaviour", "STATE_HIDDEN");
break;
case BottomSheetBehavior.STATE_SETTLING:
Log.e("Bottom Sheet Behaviour", "STATE_SETTLING");
break;
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
});
case R.id.btn_expand://展开
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
break;
case R.id.btn_collapsed://折叠
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
break;
case R.id.btn_hide://隐藏
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
break;
Bottom Sheet有五种状态：
- STATE_COLLAPSED：折叠状态，bottom sheets只在底部显示一部分布局。显示高度可以通过 app:behavior_peekHeight 设置；
- STATE_DRAGGING：过渡状态，此时用户正在向上或者向下拖动bottom sheet；
- STATE_SETTLING: 视图从脱离手指自由滑动到最终停下的这一小段时间
- STATE_EXPANDED: 完全展开的状态
- STATE_HIDDEN: 隐藏状态。默认是false，可通过app:behavior_hideable属性设置是否能隐藏
这种使用方法是没有蒙层，可以对其他控件进行操作。
2、BottomSheetDialog的使用
BottomSheetDialog的使用就和对话框差不多。会出现蒙层，只能对弹出的页面进行操作。
if (dialog == null){
dialog = new BottomSheetDialog(this);
}
dialog.setCancelable(false);
dialog.setCanceledOnTouchOutside(true);
View view =LayoutInflater.from(BottomSheetActivity.this).inflate(R.layout.content_bottom_sheet_dialog,null);
TextView tvWechat = view.findViewById(R.id.tv_wechat);
tvWechat.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(BottomSheetActivity.this,"微信",Toast.LENGTH_SHORT).show();
dialog.dismiss();
}
});
dialog.setContentView(view);
dialog.show();
BottomSheetDialog部分源码：
private View wrapInBottomSheet(int layoutResId, View view, ViewGroup.LayoutParams params) {
final CoordinatorLayout coordinator = (CoordinatorLayout) View.inflate(getContext(),
R.layout.design_bottom_sheet_dialog, null);
if (layoutResId != 0 && view == null) {
view = getLayoutInflater().inflate(layoutResId, coordinator, false);
}
FrameLayout bottomSheet = (FrameLayout) coordinator.findViewById(R.id.design_bottom_sheet);
mBehavior = BottomSheetBehavior.from(bottomSheet);
mBehavior.setBottomSheetCallback(mBottomSheetCallback);
mBehavior.setHideable(mCancelable);
if (params == null) {
bottomSheet.addView(view);
} else {
bottomSheet.addView(view, params);
}
// We treat the CoordinatorLayout as outside the dialog though it is technically inside
coordinator.findViewById(R.id.touch_outside).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mCancelable && isShowing() && shouldWindowCloseOnTouchOutside()) {
cancel();
}
}
});
// Handle accessibility events
ViewCompat.setAccessibilityDelegate(bottomSheet, new AccessibilityDelegateCompat() {
@Override
public void onInitializeAccessibilityNodeInfo(View host,
AccessibilityNodeInfoCompat info) {
super.onInitializeAccessibilityNodeInfo(host, info);
if (mCancelable) {
info.addAction(AccessibilityNodeInfoCompat.ACTION_DISMISS);
info.setDismissable(true);
} else {
info.setDismissable(false);
}
}
@Override
public boolean performAccessibilityAction(View host, int action, Bundle args) {
if (action == AccessibilityNodeInfoCompat.ACTION_DISMISS && mCancelable) {
cancel();
return true;
}
return super.performAccessibilityAction(host, action, args);
}
});
bottomSheet.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
// Consume the event and prevent it from falling through
return true;
}
});
return coordinator;
}
由源码可知，BottomSheetDialog的setContentView最终是被CoordinatorLayout包裹住。
3、BottomSheetDialogFragment的使用
BottomSheetDialogFragment的使用和fragment一样。可以帮助我们实现全屏的BottomSheet展示效果
CustomFragmentDialog fragmentDialog = new CustomFragmentDialog();
fragmentDialog.show(getSupportFragmentManager(),"CustomFragmentDialog");
public class CustomFragmentDialog extends BottomSheetDialogFragment {
private ArrayList<String> list = new ArrayList<>();
public CustomFragmentDialog() {
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.content_bottom_sheet_fragment_dialog,container, false);
initViews(view);
return view;
}
private void initViews(View view) {
for (int i = 0;i < 100;i++){
list.add("条目"+i);
}
RecyclerView recyclerView = view.findViewById(R.id.rv_item);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
RecyclerViewAdapter adapter = new RecyclerViewAdapter(list);
recyclerView.setAdapter(adapter);
}
}
/**
* 全屏显示
*/
public class FullSheetDialogFragment extends BottomSheetDialogFragment{
private BottomSheetBehavior mBehavior;
private ArrayList<String> list = new ArrayList<>();
public FullSheetDialogFragment() {
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
View view = View.inflate(getContext(), R.layout.content_bottom_sheet_fragment_dialog, null);
initViews(view);
dialog.setContentView(view);
mBehavior = BottomSheetBehavior.from((View) view.getParent());
return dialog;
}
private void initViews(View view) {
for (int i = 0;i < 100;i++){
list.add("条目"+i);
}
RecyclerView recyclerView = view.findViewById(R.id.rv_item);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
RecyclerViewAdapter adapter = new RecyclerViewAdapter(list);
recyclerView.setAdapter(adapter);
}
@Override
public void onStart()
{
super.onStart();
mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);//全屏展开
}
}
