Map Development Instance

1. Google map Introduction
APIS provided by Google to developers
1) map-based API
2) Android encapsulates most map functions in mapview
3) mapview obtains data through the googlemaps service.
And displayed as a map
4) mapview provides a set of controls for map control.
2. Obtain the Maps API key
1) ApplicationProgramSignature (developer of the Identification Program)
The certificate contains a unique key.
2) procedure for applying for a map API key
A. Generate a certificate fingerprint
1. Switch to the. Android directory under cmd
2. Enter the command: keytool-list-alias androiddebugkey-keystore Debug. keystore
3. Prompt: Enter the keystore password: (the password is Android)
4. Obtain the authentication fingerprint: MD5 encrypted string:
88 0: 55: 11: 25: 46: 0f: 03: 21: 14: 74: C1: E6: FB: BB: 3D
5. Open the website: Http://code.google.com/intl/zh-CN/android/maps-api-signup.html
6. On this page, enter the above fingerprint and enter it.
7. Go to Google map to get what you need.
Your key is: 0aghymxi3zvyfk-wg5x4easzhcxnjcrexmbo7zw
This key applies to all applications that use the certificate corresponding to the following fingerprint for verification:
67: A6: E5: 80: AC: B5: 8f: 8e: Be: 37: 1f: Be: 32: 1D: B3: 5b
The following is an XML format example to help you understand the map function:
<Com. Google. Android. Maps. mapview
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: apikey = "0aghymxi3zvzuxjgd7qnmjcj1_fai7mmiqwzp-w"
/>
3. Create the first mapview
Note: When creating a project, select Google APIs for the API
The simulator also chooses Google APIs.
Activity inherits mapactivity.
If the key is written incorrectly, a blank map is displayed.
Layout file (use of the mapview Control ):
<Com. Google. Android. Maps. mapview
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: enabled = "true"
Android: clickable = "true"
Android: apikey = "0aghymxi3zvzuxjgd7qnmjcj1_fai7mmiqwzp-w"
/>
In the main configuration file:
<Application> Add application map permission
<Uses-library Android: Name = "com. Google. Android. Maps"/>
4. map marking
1) Add a flag to the map
Three Layers (mapview overlay1 overlay2)

Procedure:
A. Create a separate layer on mapview
B. Create a tag object
C. The tag is displayed at the specified position of the specified layer.
D. Process click tag events
2) Role of overlay (overlay is an abstract class)
Map-tagged container
3) Role of itemizedoverlay <overlayitem>
A. It is a subclass of overlay.
B. contains one or more overlayitem objects.
C. Each overlayitem represents a tag
4) How to Use itemizedoverlay
5. Drawing path on the map
1) Projection
Geopoint)
Point)
Note: geopoint indicates the start point and end point.
Convert longitude and latitude to XY coordinates on the screen
Method implementation:
A. Longitude and latitude ---> coordinates
Projection. topixels (geopoint, point );
B. Coordinates ---> longitude and latitude
Projection. frompixels (int x, int y)
2) how to draw a straight line on GoogleMap
Steps:
A. Determine the start and end longitude and latitude coordinates of the line
B. Draw icons on the start and end points
C. Convert the longitude and latitude coordinates into the X and Y axes on the screen.
D. Draw a route between the start and end points