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本节讲intent实现打车的功能，以及调用地图，以及播放媒体文件。

Local Actions

Call a car

To call a taxi, use the ACTION_RESERVE_TAXI_RESERVATION action.

Note: Apps must ask for confirmation from the user before completing the action.

Action
ACTION_RESERVE_TAXI_RESERVATION
Data URI
  None
MIME Type
  None
Extras
  None

Example intent:

public void callCar() {    Intent intent = new Intent(ReserveIntents.ACTION_RESERVE_TAXI_RESERVATION);    if (intent.resolveActivity(getPackageManager()) != null) {        startActivity(intent);    }}

Example intent filter:

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

Maps

Show a location on a map
To open a map, use the ACTION_VIEW action and specify the location information in the intent data with one of the schemes defined below.

Action
ACTION_VIEW
Data URI Scheme
  geo:latitude,longitude
      Show the map at the given longitude and latitude.
      Example: "geo:47.6,-122.3"

  geo:latitude,longitude?z=zoom
      Show the map at the given longitude and latitude at a certain zoom level. A zoom level of 1 shows the whole Earth, centered at the given lat,lng. The highest (closest) zoom level is 23.
      Example: "geo:47.6,-122.3?z=11"

  geo:0,0?q=lat,lng(label)
      Show the map at the given longitude and latitude with a string label.
      Example: "geo:0,0?q=34.99,-106.61(Treasure)"

  geo:0,0?q=my+street+address
      Show the location for "my street address" (may be a specific address or location query).
      Example: "geo:0,0?q=1600+Amphitheatre+Parkway%2C+CA"

Note: All strings passed in the geo URI must be encoded. For example, the string 1st & Pike, Seattle should become 1st%20%26%20Pike%2C%20Seattle. Spaces in the string can be encoded with %20 or replaced with the plus sign (+).

MIME Type
None
Example intent:

public void showMap(Uri geoLocation) {    Intent intent = new Intent(Intent.ACTION_VIEW);    intent.setData(geoLocation);    if (intent.resolveActivity(getPackageManager()) != null) {        startActivity(intent);    }}

Example intent filter:

<activity ...>    <intent-filter>        <action android:name="android.intent.action.VIEW" />        <data android:scheme="geo" />        <category android:name="android.intent.category.DEFAULT" />    </intent-filter></activity>

Music or Video
Play a media file
To play a music file, use the ACTION_VIEW action and specify the URI location of the file in the intent data.

Action
ACTION_VIEW
Data URI Scheme
  file:<URI>
  content:<URI>
  http:<URL>
MIME Type
  "audio/*"
  "application/ogg"
  "application/x-ogg"
  "application/itunes"
  Or any other that your app may require.

Example intent:

public void playMedia(Uri file) {    Intent intent = new Intent(Intent.ACTION_VIEW);    intent.setData(file);    if (intent.resolveActivity(getPackageManager()) != null) {        startActivity(intent);    }}

Example intent filter:

<activity ...>    <intent-filter>        <action android:name="android.intent.action.VIEW" />        <data android:type="audio/*" />        <data android:type="application/ogg" />        <category android:name="android.intent.category.DEFAULT" />    </intent-filter></activity>

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