本意是通过点击事件更新嵌套在bottom sheet中recyclerview的itemText。但是setadapter方法却不能正常刷新，反而显示一片空白。。。试过很多办法，比如重新调用setLayoutManager、void run()等等都不行。Demo在BottomSheetSample的基础上略微修改

MainActivity.java

package com.nkdroid.bottomsheetsample;  import android.content.DialogInterface; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.BottomSheetBehavior; import android.support.design.widget.BottomSheetDialog; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.View; import android.widget.Button;  import java.util.ArrayList; import java.util.List; import java.util.Random;  public class MainActivity extends AppCompatActivity implements ItemAdapter.ItemListener {  private Button btnView, btnDialog; BottomSheetBehavior behavior; private BottomSheetDialog mBottomSheetDialog; private ItemAdapter mAdapter; RecyclerView recyclerView;  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);      btnView = (Button) findViewById(R.id.btnView);     btnDialog = (Button) findViewById(R.id.btnDialog);     btnView.setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View v) {             mAdapter = new ItemAdapter(createItems());             recyclerView.setAdapter(mAdapter);             behavior.setState(BottomSheetBehavior.STATE_EXPANDED);         }     });      btnDialog.setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View v) {             showBottomSheetDialog();         }     });      View bottomSheet = findViewById(R.id.bottom_sheet);     behavior = BottomSheetBehavior.from(bottomSheet);     behavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {         @Override         public void onStateChanged(@NonNull View bottomSheet, int newState) {             // React to state change         }          @Override         public void onSlide(@NonNull View bottomSheet, float slideOffset) {             // React to dragging events         }     });      recyclerView = (RecyclerView) findViewById(R.id.recyclerView);     recyclerView.setHasFixedSize(true);     recyclerView.setLayoutManager(new LinearLayoutManager(this));      mAdapter = new ItemAdapter(createItems(), this);     recyclerView.setAdapter(mAdapter);  }   private void showBottomSheetDialog() {     if (behavior.getState() == BottomSheetBehavior.STATE_EXPANDED) {         behavior.setState(BottomSheetBehavior.STATE_COLLAPSED);     }      mBottomSheetDialog = new BottomSheetDialog(this);     View view = getLayoutInflater().inflate(R.layout.sheet, null);     RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);     recyclerView.setHasFixedSize(true);     recyclerView.setLayoutManager(new LinearLayoutManager(this));     recyclerView.setAdapter(new ItemAdapter(createItems(), new ItemAdapter.ItemListener() {         @Override         public void onItemClick(Item item) {             if (mBottomSheetDialog != null) {                 mBottomSheetDialog.dismiss();             }         }     }));      mBottomSheetDialog.setContentView(view);     mBottomSheetDialog.show();     mBottomSheetDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {         @Override         public void onDismiss(DialogInterface dialog) {             mBottomSheetDialog = null;         }     }); }   @Override protected void onDestroy() {     super.onDestroy();     mAdapter.setListener(null); }  public List<Item> createItems() {     Random r = new Random();     ArrayList<Item> items = new ArrayList<>();     items.add(new Item(R.mipmap.ic_launcher, "Item 1"+ r.nextInt(100)));     items.add(new Item(R.mipmap.ic_launcher, "Item 2"));     items.add(new Item(R.mipmap.ic_launcher, "Item 3"));     items.add(new Item(R.mipmap.ic_launcher, "Item 4"));     return items; }  @Override public void onItemClick(Item item) {     behavior.setState(BottomSheetBehavior.STATE_COLLAPSED); }  }

ItemAdapter.java

package com.nkdroid.bottomsheetsample;  import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import java.util.List;   public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ViewHolder> {  private List<Item> mItems; private ItemListener mListener;  public ItemAdapter(List<Item> items, ItemListener listener) {     mItems = items;     mListener = listener; }  public ItemAdapter(List<Item> items) {     mItems = items; }  public void setListener(ItemListener listener) {     mListener = listener; }  @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {     return new ViewHolder(LayoutInflater.from(parent.getContext())             .inflate(R.layout.adapter, parent, false)); }  @Override public void onBindViewHolder(ViewHolder holder, int position) {     holder.setData(mItems.get(position)); }  @Override public int getItemCount() {     return mItems.size(); }  public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {      public ImageView imageView;     public TextView textView;     public Item item;      public ViewHolder(View itemView) {         super(itemView);         itemView.setOnClickListener(this);         imageView = (ImageView) itemView.findViewById(R.id.imageView);         textView = (TextView) itemView.findViewById(R.id.textView);     }      public void setData(Item item) {         this.item = item;         imageView.setImageResource(item.getDrawableResource());         textView.setText(item.getTitle());     }      @Override     public void onClick(View v) {         if (mListener != null) {             mListener.onItemClick(item);         }     } }  public interface ItemListener {     void onItemClick(Item item); } }

下图是第一次点击和第二次点击show view的截图


BottomSheetDialog能正常更新，常规的BottomSheet却不行。。。