使用ListVIew 来设置EmptyView的时候须注意：

ListView listview = (ListView) findViewById(R.id.list);        View emptyView = findViewById(R.id.empty);        ViewGroup parentView = (ViewGroup) listview.getParent();        parentView.addView(emptyView, 2); // 一定要将EmptyView添加到ListView的ParentView上，不然无效果        listview.setEmptyView(emptyView)

如果你直接在XML中包含了emptyView，那么也就不需要再额外添加到Viewhierarchy中了，因为它已经在那儿了。

例：

ListViewApiUseDemoActivity.java

package com.yongdaimi.android.androidapitest;import android.os.Bundle;import android.os.Handler;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.Gravity;import android.view.ViewGroup;import android.view.ViewParent;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.TextView;public class ListViewApiUseDemoActivity extends AppCompatActivity {    private ListView lv_list;    private TextView tv_empty_view;    private ArrayAdapter
     
       arrayAdapter;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_listview_api_use_demo);        initView();       /* tv_empty_view = new TextView(this);        tv_empty_view.setText("No Data");        tv_empty_view.setGravity(Gravity.CENTER);        ViewGroup viewGroup = (ViewGroup) lv_list.getParent();        viewGroup.addView(tv_empty_view, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));*/        lv_list.setEmptyView(tv_empty_view);        String[] emptyData = new String[]{};        arrayAdapter = new ArrayAdapter
      
       (getApplicationContext(), android.R.layout.simple_list_item_1, emptyData);        lv_list.setAdapter(arrayAdapter);        new Handler().postDelayed(new Runnable() {            @Override            public void run() {                String[] data = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"};                arrayAdapter = new ArrayAdapter
       
        (getApplicationContext(), android.R.layout.simple_list_item_1, data);                lv_list.setAdapter(arrayAdapter);            }        }, 1500);        new Handler().postDelayed(new Runnable() {            @Override            public void run() {                String[] data = {};                arrayAdapter = new ArrayAdapter
        
         (getApplicationContext(), android.R.layout.simple_list_item_1, data);                lv_list.setAdapter(null);            }        }, 4500);    }    private void initView() {        lv_list = findViewById(R.id.lv_list);         tv_empty_view = findViewById(R.id.tv_empty_view);    }}