The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
* Copyright (C) 2008 The Android开源工程
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.app;
import com.example.android.apis.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.SearchManager;
import android.os.Bundle;
import android.provider.SearchRecentSuggestions;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
public class SearchInvoke extends Activity
{
// UI elements
Button mStartSearch;
Spinner mMenuMode;
EditText mQueryPrefill;
EditText mQueryAppData;
// Menu mode spinner choices
// This list must match the list found in samples/ApiDemos/res/values/arrays.xml
final static int MENUMODE_SEARCH_KEY = 0;
final static int MENUMODE_MENU_ITEM = 1;
final static int MENUMODE_TYPE_TO_SEARCH = 2;
final static int MENUMODE_DISABLED = 3;
/**
* Called with the activity is first created.
*
* We aren't doing anything special in this implementation, other than
* the usual activity setup code.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Inflate our UI from its XML layout description.
setContentView(R.layout.search_invoke);
// Get display items for later interaction
mStartSearch = (Button) findViewById(R.id.btn_start_search);
mMenuMode = (Spinner) findViewById(R.id.spinner_menu_mode);
mQueryPrefill = (EditText) findViewById(R.id.txt_query_prefill);
mQueryAppData = (EditText) findViewById(R.id.txt_query_appdata);
// Populate items
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.search_menuModes, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mMenuMode.setAdapter(adapter);
// Create listener for the menu mode dropdown. We use this to demonstrate control
// of the default keys handler in every Activity. More typically, you will simply set
// the default key mode in your activity's onCreate() handler.
mMenuMode.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
if (position == MENUMODE_TYPE_TO_SEARCH) {
setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
} else {
setDefaultKeyMode(DEFAULT_KEYS_DISABLE);
}
}
public void onNothingSelected(AdapterView<?> parent) {
setDefaultKeyMode(DEFAULT_KEYS_DISABLE);
}
});
// Attach actions to buttons
mStartSearch.setOnClickListener(
new OnClickListener() {
public void onClick(View v) {
onSearchRequested();
}
});
}
/**
* Called when your activity's options menu needs to be updated.
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
MenuItem item;
// first, get rid of our menus (if any)
menu.removeItem(0);
menu.removeItem(1);
// next, add back item(s) based on current menu mode
switch (mMenuMode.getSelectedItemPosition())
{
case MENUMODE_SEARCH_KEY:
item = menu.add( 0, 0, 0, "(Search Key)");
break;
case MENUMODE_MENU_ITEM:
item = menu.add( 0, 0, 0, "Search");
item.setAlphabeticShortcut(SearchManager.MENU_KEY);
break;
case MENUMODE_TYPE_TO_SEARCH:
item = menu.add( 0, 0, 0, "(Type-To-Search)");
break;
case MENUMODE_DISABLED:
item = menu.add( 0, 0, 0, "(Disabled)");
break;
}
item = menu.add(0, 1, 0, "Clear History");
return true;
}
/** Handle the menu item selections */
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 0:
switch (mMenuMode.getSelectedItemPosition()) {
case MENUMODE_SEARCH_KEY:
new AlertDialog.Builder(this)
.setMessage("To invoke search, dismiss this dialog and press the search key" +
" (F5 on the simulator).")
.setPositiveButton("OK", null)
.show();
break;
case MENUMODE_MENU_ITEM:
onSearchRequested();
break;
case MENUMODE_TYPE_TO_SEARCH:
new AlertDialog.Builder(this)
.setMessage("To invoke search, dismiss this dialog and start typing.")
.setPositiveButton("OK", null)
.show();
break;
case MENUMODE_DISABLED:
new AlertDialog.Builder(this)
.setMessage("You have disabled search.")
.setPositiveButton("OK", null)
.show();
break;
}
break;
case 1:
clearSearchHistory();
break;
}
return super.onOptionsItemSelected(item);
}
/**
* This hook is called when the user signals the desire to start a search.
*
* By overriding this hook we can insert local or context-specific data.
*
* @return Returns true if search launched, false if activity blocks it
*/
@Override
public boolean onSearchRequested() {
// If your application absolutely must disable search, do it here.
if (mMenuMode.getSelectedItemPosition() == MENUMODE_DISABLED) {
return false;
}
// It's possible to prefill the query string before launching the search
// UI. For this demo, we simply copy it from the user input field.
// For most applications, you can simply pass null to startSearch() to
// open the UI with an empty query string.
final String queryPrefill = mQueryPrefill.getText().toString();
// Next, set up a bundle to send context-specific search data (if any)
// The bundle can contain any number of elements, using any number of keys;
// For this Api Demo we copy a string from the user input field, and store
// it in the bundle as a string with the key "demo_key".
// For most applications, you can simply pass null to startSearch().
Bundle appDataBundle = null;
final String queryAppDataString = mQueryAppData.getText().toString();
if (queryAppDataString != null) {
appDataBundle = new Bundle();
appDataBundle.putString("demo_key", queryAppDataString);
}
// Now call the Activity member function that invokes the Search Manager UI.
startSearch(queryPrefill, false, appDataBundle, false);
// Returning true indicates that we did launch the search, instead of blocking it.
return true;
}
/**
* Any application that implements search suggestions based on previous actions (such as
* recent queries, page/items viewed, etc.) should provide a way for the user to clear the
* history. This gives the user a measure of privacy, if they do not wish for their recent
* searches to be replayed by other users of the device (via suggestions).
*
* This example shows how to clear the search history for apps that use
* android.provider.SearchRecentSuggestions. If you have developed a custom suggestions
* provider, you'll need to provide a similar API for clearing history.
*
* In this sample app we call this method from a "Clear History" menu item. You could also
* implement the UI in your preferences, or any other logical place in your UI.
*/
private void clearSearchHistory() {
SearchRecentSuggestions suggestions = new SearchRecentSuggestions(this,
SearchSuggestionSampleProvider.AUTHORITY, SearchSuggestionSampleProvider.MODE);
suggestions.clearHistory();
}
}