RecyclerView貌似不能直接设置空视图，所以可以自定义一个RecyclerView继承自RecyclerView并设置一个数据监听者监视数据状态。

MyCyclerView.java

package com.onepilltest.others;import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;public class MyRecyclerView extends RecyclerView {private View emptyView;private static final String TAG = "EmptyRecyclerView";//数据监听者final private AdapterDataObserver adapterDataObserver = new AdapterDataObserver() {@Overridepublic void onChanged() {checkIfEmpty();}@Overridepublic void onItemRangeInserted(int positionStart, int itemCount) {Log.i(TAG, "onItemRangeInserted" + itemCount);checkIfEmpty();}@Overridepublic void onItemRangeRemoved(int positionStart, int itemCount) {checkIfEmpty();}};private void checkIfEmpty() {if (emptyView != null && getAdapter() != null) {final boolean emptyViewVisible =getAdapter().getItemCount() == 0;emptyView.setVisibility(emptyViewVisible ? VISIBLE : GONE);setVisibility(emptyViewVisible ? GONE : VISIBLE);}}@Overridepublic void setAdapter(@Nullable Adapter adapter) {final Adapter oldAdapter = getAdapter();if (oldAdapter != null) {oldAdapter.unregisterAdapterDataObserver(adapterDataObserver);}super.setAdapter(adapter);if (adapter != null) {adapter.registerAdapterDataObserver(adapterDataObserver);}checkIfEmpty();}//设置没有内容时，提示用户的空布局public void setEmptyView(View emptyView) {this.emptyView = emptyView;checkIfEmpty();}public MyRecyclerView(@NonNull Context context) {super(context);}public MyRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs) {super(context, attrs);}public MyRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}
}

使用时和正常的RecyclerView一样，设置空视图时只需要调用setEmptyView即可。

recyclerView = findViewById(R.id.focus_list_list);LinearLayoutManager layoutManager = new LinearLayoutManager(this);recyclerView.setLayoutManager(layoutManager);mEmptyView = findViewById(R.id.empty_iv);