基本使用很簡單：

public class FullSheetDialogFragment extends BottomSheetDialogFragment {
    private BottomSheetBehavior mBehavior;
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
        View view = View.inflate(getContext(), R.layout.dialog_bottom_sheet, null);
        dialog.setContentView(view);
        mBehavior = BottomSheetBehavior.from((View) view.getParent());
        return dialog;
    }

    @Override
    public void onStart()
    {
        super.onStart();
        //預設全屏展開
        mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
    }

    public void doclick(View v)
    {
        //點選任意佈局關閉
        mBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
    }
}

 

呼叫BottomSheetDialogFragment展示

new FullSheetDialogFragment().show(getSupportFragmentManager(), "dialog");

下面是一些坑。

dialog按螢幕高度百分比調整大小：

BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState); mContext = getContext(); 
View view = View.inflate(mContext, R.layout.dialog_bottom_sheet1, null); dialog.setContentView(view); 
ViewGroup.LayoutParams layoutParams = view.getLayoutParams(); 
int height = (int) (mContext.getResources().getDisplayMetrics().heightPixels * 0.9); layoutParams.height = height; 
view.setLayoutParams(layoutParams);
 

去除層疊顯示（就是去掉完全展開，中間狀態，隱藏中的中間狀態）：

//height就是整個dialog的高度，同上面的height。如果設定為0也可以實現效果，但會導致滑動關閉後，有一層陰影遮罩，
//需要點選一次才能消失。原因是設定為0，滑動到看不見時，其實是處於中間狀態，並沒有完全關閉dialog。
mBehavior.setPeekHeight(height);

圓角背景：

//先設定背景為透明

dialog.getWindow().findViewById(R.id.design_bottom_sheet).setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

//shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle"
    >

    <corners
        android:topLeftRadius="20dp"
        android:topRightRadius="20dp"></corners>
    <solid android:color="@color/white"></solid>

</shape>