带有示例的Android SearchView

搜索视图窗口小部件用于为用户提供搜索界面，以便用户可以输入其搜索查询并向搜索提供程序提交请求，并获取查询建议或结果列表。

类语法：

public class SearchView
extends LinearLayout
implements CollapsibleActionView

类层次结构：

java.lang.Object
  ↳  android.view.View
    ↳  android.view.ViewGroup
      ↳  android.widget.LinearLayout
        ↳  android.widget.SearchView

演示SearchView的示例：
在本文中，您将创建具有搜索视图和列表视图的基本搜索应用程序。用户将在操作栏中显示的搜索视图中键入搜索查询。以下是说明步骤：

• 步骤1：activity_main.xml

  它由带有ListView的相对布局组成，从中可以搜索数据。这是activity_main.xml的完整代码：

• 步骤2：menu.xml

  创建menu.xml并将搜索视图作为菜单项添加到操作栏，标题为“搜索”此文件。这是menu.xml文件的完整代码。
• 步骤3：MainActivity。Java
  下一步是设置主要活动的代码。在此Java文件中，将项目手动添加到列表视图，并将setOnQueryTextListener附加到搜索视图。 onQueryTextSubmit()方法被覆盖，其中List View根据用户输入的搜索查询获取过滤器。这里是MainActivity的完整代码。 Java的：

  主要活动。Java

  package com.geeksforgeeks.searchviewwidget;
    
  import android.support.v7.app.AppCompatActivity;
  import android.view.Menu;
  import android.view.MenuInflater;
  import android.view.MenuItem;
  import android.os.Bundle;
  import android.widget.ListView;
  import android.widget.ArrayAdapter;
  import android.widget.SearchView;
  import java.util.ArrayList;
    
  public class MainActivity extends AppCompatActivity {
    
      // List View object
      ListView listView;
    
      // Define array adapter for ListView
      ArrayAdapter adapter;
    
      // Define array List for List View data
      ArrayList mylist;
    
      @Override
      protected void onCreate(Bundle savedInstanceState)
      {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
    
          // initialise ListView with id
          listView = findViewById(R.id.listView);
    
          // Add items to Array List
          mylist = new ArrayList<>();
          mylist.add("C");
          mylist.add("C++");
          mylist.add("C#");
          mylist.add("Java");
          mylist.add("Advanced java");
          mylist.add("Interview prep with c++");
          mylist.add("Interview prep with java");
          mylist.add("data structures with c");
          mylist.add("data structures with java");
    
          // Set adapter to ListView
          adapter
              = new ArrayAdapter(
                  this,
                  android.R.layout.simple_list_item_1,
                  mylist);
          listView.setAdapter(adapter);
      }
    
      @Override
      public boolean onCreateOptionsMenu(Menu menu)
      {
          // Inflate menu with items using MenuInflator
          MenuInflater inflater = getMenuInflater();
          inflater.inflate(R.menu.menu, menu);
    
          // Initialise menu item search bar
          // with id and take its object
          MenuItem searchViewItem
              = menu.findItem(R.id.search_bar);
          SearchView searchView
              = MenuItemCompat
                    .getActionView(searchViewItem);
    
          // attach setOnQueryTextListener
          // to search view defined above
          searchView.setOnQueryTextListener(
              new SearchView.OnQueryTextListener() {
    
                  // Override onQueryTextSubmit method
                  // which is call
                  // when submitquery is searched
    
                  @Override
                  public boolean onQueryTextSubmit(String query)
                  {
                      // If the list contains the search query
                      // than filter the adapter
                      // using the filter method
                      // with the query as its argument
                      if (list.contains(query)) {
                          adapter.getFilter().filter(query);
                      }
                      else {
                          // Search query not found in List View
                          Toast
                              .makeText(MainActivity.this,
                                        "Not found",
                                        Toast.LENGTH_LONG)
                              .show();
                      }
                      return false;
                  }
    
                  // This method is overridden to filter
                  // the adapter according to a search query
                  // when the user is typing search
                  @Override
                  public boolean onQueryTextChange(String newText)
                  {
                      adapter.getFilter().filter(newText);
                      return false;
                  }
              });
    
          return super.onCreateOptionsMenu(menu);
      }
  }
  

输出：

• 带有搜索栏和列表的主要活动
  
• 根据搜索查询的搜索结果
  
• 搜索结果