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今天讲使用intent打开搜索，包括特定app的上下文环境搜索和Web搜索。另外，再讲下使用intent打开相关的各种设置页面。

Search
Search using a specific app

To support search within the context of your app, declare an intent filter in your app with the SEARCH_ACTION action, as shown in the example intent filter below.

Action
"com.google.android.gms.actions.SEARCH_ACTION"
  Support search queries from Google Voice Actions.
Extras
  QUERY
      A string that contains the search query.
Example intent filter:

<activity android:name=".SearchActivity">    <intent-filter>        <action android:name="com.google.android.gms.actions.SEARCH_ACTION"/>        <category android:name="android.intent.category.DEFAULT"/>    </intent-filter></activity>

Perform a web search
To initiate a web search, use the ACTION_WEB_SEARCH action and specify the search string in the SearchManager.QUERY extra.

Action
ACTION_WEB_SEARCH
Data URI Scheme
  None
MIME Type
  None
Extras
  SearchManager.QUERY
      The search string.
Example intent:

public void searchWeb(String query) {    Intent intent = new Intent(Intent.ACTION_SEARCH);    intent.putExtra(SearchManager.QUERY, query);    if (intent.resolveActivity(getPackageManager()) != null) {        startActivity(intent);    }}

Settings
Open a specific section of Settings
To open a screen in the system settings when your app requires the user to change something, use one of the following intent actions to open the settings screen respective to the action name.

Action
ACTION_SETTINGS
  ACTION_WIRELESS_SETTINGS
  ACTION_AIRPLANE_MODE_SETTINGS
  ACTION_WIFI_SETTINGS
  ACTION_APN_SETTINGS
  ACTION_BLUETOOTH_SETTINGS
  ACTION_DATE_SETTINGS
  ACTION_LOCALE_SETTINGS
  ACTION_INPUT_METHOD_SETTINGS
  ACTION_DISPLAY_SETTINGS
  ACTION_SECURITY_SETTINGS
  ACTION_LOCATION_SOURCE_SETTINGS
  ACTION_INTERNAL_STORAGE_SETTINGS
  ACTION_MEMORY_CARD_SETTINGS
See the Settings documentation for additional settings screens that are available.

Data URI Scheme
  None
MIME Type
  None
Example intent:

public void openWifiSettings() {    Intent intent = new Intent(Intent.ACTION_WIFI_SETTINGS);    if (intent.resolveActivity(getPackageManager()) != null) {        startActivity(intent);    }}

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