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   源码介绍

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package com.example.searchview;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.*;
 
import java.util.ArrayList;
 
public class MainActivity extends Activity implements SearchView.OnQueryTextListener,
        SearchView.OnCloseListener {
 
    private ListView myList;
    private SearchView searchView;
    private SearchHelper mDbHelper;
    private MyCustomAdapter defaultAdapter;
    private ArrayList<String> nameList;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        setContentView(R.layout.activity_main);
 
        nameList = new ArrayList<String>();
 
        //for simplicity we will add the same name for 20 times to populate the nameList view
            nameList.add("Aakash");
            nameList.add("Sam");
            nameList.add("Joe");
            nameList.add("Salman");
            nameList.add("Rahul");
            nameList.add("Dave");
            nameList.add("Rohit");
            nameList.add("Kishan");
            nameList.add("Janesh");
            nameList.add("JD");
            nameList.add("Aafghhh");
            nameList.add("Ankit");
            nameList.add("Diana");
        
 
        //relate the listView from java to the one created in xml
        myList = (ListView) findViewById(R.id.list);
 
        //show the ListView on the screen
        // The adapter MyCustomAdapter is responsible for maintaining the data backing this nameList and for producing
        // a view to represent an item in that data set.
        defaultAdapter = new MyCustomAdapter(MainActivity.this, nameList);
        myList.setAdapter(defaultAdapter);
 
        //prepare the SearchView
        searchView = (SearchView) findViewById(R.id.search);
 
        //Sets the default or resting state of the search field. If true, a single search icon is shown by default and
        // expands to show the text field and other buttons when pressed. Also, if the default state is iconified, then it
        // collapses to that state when the close button is pressed. Changes to this property will take effect immediately.
        //The default value is true.
        searchView.setIconifiedByDefault(false);
 
        searchView.setOnQueryTextListener(this);
        searchView.setOnCloseListener(this);
 
        mDbHelper = new SearchHelper(this);
        mDbHelper.open();
 
        //Clear all names
        mDbHelper.deleteAllNames();
 
        // Create the list of names which will be displayed on search
        for (String name : nameList) {
            mDbHelper.createList(name);
        }
    }
 
    @Override
    protected void onDestroy() {
        super.onDestroy();
 
        if (mDbHelper  != null) {
            mDbHelper.close();
        }
    }
 
    @Override
    public boolean onClose() {
        myList.setAdapter(defaultAdapter);
        return false;
    }
 
    @Override
    public boolean onQueryTextSubmit(String query) {
        displayResults(query   "*");
        return false;
    }
 
    @Override
    public boolean onQueryTextChange(String newText) {
        if (!newText.isEmpty()){
            displayResults(newText   "*");
        } else {
            myList.setAdapter(defaultAdapter);
        }
 
        return false;
    }
 
    /**
     * Method used for performing the search and displaying the results. This method is called every time a letter
     * is introduced in the search field.
     *
     * @param query Query used for performing the search
     */
    private void displayResults(String query) {
 
        Cursor cursor = mDbHelper.searchByInputText((query != null ? query : "@@@@"));
 
        if (cursor != null) {
 
            String[] from = new String[] {SearchHelper.COLUMN_NAME};
 
            // Specify the view where we want the results to go
            int[] to = new int[] {R.id.search_result_text_view};
 
            // Create a simple cursor adapter to keep the search data
            SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.result_search_item, cursor, from, to);
            myList.setAdapter(cursorAdapter);
 
            // Click listener for the searched item that was selected
            myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 
                    // Get the cursor, positioned to the corresponding row in the result set
                    Cursor cursor = (Cursor) myList.getItemAtPosition(position);
 
                    // Get the state's capital from this row in the database.
                    String selectedName = cursor.getString(cursor.getColumnIndexOrThrow("name"));
                    Toast.makeText(MainActivity.this, selectedName, Toast.LENGTH_SHORT).show();
 
                    // Set the default adapter
                    myList.setAdapter(defaultAdapter);
 
                    // Find the position for the original list by the selected name from search
                    for (int pos = 0; pos < nameList.size(); pos  ) {
                        if (nameList.get(pos).equals(selectedName)){
                            position = pos;
                            break;
                        }
                    }
 
                    // Create a handler. This is necessary because the adapter has just been set on the list again and
                    // the list might not be finished setting the adapter by the time we perform setSelection.
                    Handler handler = new Handler();
                    final int finalPosition = position;
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
 
                            myList.setSelection(finalPosition);
                        }
                    });
 
                    searchView.setQuery("",true);
                }
            });
 
        }
    }
}