实例介绍
【实例简介】
【实例截图】
【核心代码】
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); } }); } } }
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