1、建TouristUI類
2、入必要的類
package com.nokia.example.location.tourist.ui;
import Javax.microedition.lcdui.Canvas;
import Javax.microedition.lcdui.Command;
import Javax.microedition.lcdui.CommandListener;
import Javax.microedition.lcdui.Displayable;
import Javax.microedition.lcdui.Font;
import Javax.microedition.lcdui.Graphics;
import Javax.microedition.location.AddressInfo;
import Javax.microedition.location.QualifIEdCoordinates;
import com.nokia.example.location.tourist.TouristMIDlet;
import com.nokia.example.location.tourist.Utils;
import com.nokia.example.location.tourist.model.ConfigurationProvider;
import com.nokia.example.location.tourist.model.TouristData;
3、建TouristUI類，並將其設置為Canvas擴展，運行CommandLstener。定義類所需要的命令和常量，創建類結構。
/**
* VIEwer class that renders current location updates.
*/
public class TouristUI extends Canvas implements CommandListener
{
/** The current state of the location provider as a String */
private String providerState = "Unknown";
/** Proximity monitoring state. */
private String proximityState = "Waiting";
private AddressInfo info;
private QualifIEdCoordinates coord;
private float speed;
/** Command that shows compass canvas */
private Command compassCmd = new Command("Compass", Command.OK, 1);
/** Command that shows Landmark editor UI */
private Command editorCmd = new Command("Editor", Command.STOP, 1);
/** Rerefence to the Landmark editor UI */
private LandmarkEditorUI editorUI = null;
/** Rerefence to the Compass UI */
private CompassUI compassUI = null;
public TouristUI(TouristData data)
{
editorUI = new LandmarkEditorUI(this, data);
compassUI = new CompassUI(this);
checkSupportedFeatures();
addCommand(editorCmd);
setCommandListener(this);
}
4、建方法，啟動和關閉在UI上的定位API。
/**
* Enable supported Location API features on the UI and disable unsupported
* features.
*/
protected void checkSupportedFeatures()
{
if (ConfigurationProvider.getInstance().isOrIEntationSupported())
{
addCommand(compassCmd);
}
else
{
removeCommand(compassCmd);
}
}
5、建方法，設置provider和proximity狀態。
public void setProviderState(String state)
{
providerState = state;
}
public void setProximityState(String state)
{
proximityState = state;
}
public void setInfo(AddressInfo info, QualifIEdCoordinates coord,
float speed)
{
this.info = info;
this.coord = coord;
this.speed = speed;
}
6、建方法，引導Canvas。
/**
* Renders the canvas.
*
* @param g -
* the Graphics object to be used for rendering the Canvas
*/
protected void paint(Graphics g)
{
Font f = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN,
Font.SIZE_SMALL);
g.setFont(f);
// use font height as a line height
int lineHeight = f.getHeight();
// current line counter
int line = 0;
// clean the backround
g.setColor(0xffffff);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(0x0000ff);
g.drawString("Provider state: " + providerState, 0, lineHeight
* (line++), Graphics.LEFT | Graphics.TOP);
g.drawString("Proximity monitoring: " + proximityState, 0, lineHeight
* (line++), Graphics.LEFT | Graphics.TOP);
if (coord != null)
{
double lat = coord.getLatitude();
double lon = coord.getLongitude();
g.drawString("Lat, Lon (" + Utils.formatDouble(lat, 3) + ", "
+ Utils.formatDouble(lon, 3) + ")", 0, lineHeight
* (line++), Graphics.TOP | Graphics.LEFT);
g.drawString("Speed: " + Utils.formatDouble(speed, 2) + " m/s", 0,
lineHeight * (line++), Graphics.TOP | Graphics.LEFT);
}
// Check if AddressInfo is available
if (info != null)
{
String country = info.getFIEld(AddressInfo.COUNTRY);
String state = info.getFIEld(AddressInfo.STATE);
String city = info.getFIEld(AddressInfo.CITY);
String street = info.getFIEld(AddressInfo.STREET);
String buildingName = info.getFIEld(AddressInfo.BUILDING_NAME);
g.setColor(0x000000);
if (country != null)
g.drawString("Country: " + country, 0, lineHeight * (line++),
Graphics.TOP | Graphics.LEFT);
if (state != null)
g.drawString("State: " + state, 0, lineHeight * (line++),
Graphics.TOP | Graphics.LEFT);
if (city != null)
g.drawString("City: " + city, 0, lineHeight * (line++),
Graphics.TOP | Graphics.LEFT);
if (street != null)
g.drawString("Street: " + street, 0, lineHeight * (line++),
Graphics.TOP | Graphics.LEFT);
if (buildingName != null)
g.drawString("Building name: " + buildingName, 0, lineHeight
* (line++), Graphics.TOP | Graphics.LEFT);
}
}
7、建按鍵輸入命令事件。
/**
* Event indicating when a command button is pressed.
*
* @see Javax.microedition.lcdui.CommandListener#commandAction
(Javax.microedition.lcdui.Command,
* Javax.microedition.lcdui.Displayable)
*/
public void commandAction(Command command, Displayable d)
{
if (command == editorCmd)
{
if (coord != null)
{
editorUI.showEditor(coord, LandmarkEditorUI.MODE_ADDNEW);
}
else
{
MessageUI.showLocationDataNotAvailable();
}
}
else if (command == compassCmd)
{
TouristMIDlet.getDisplay().setCurrent(compassUI);
}
}
}
創建了項目所需要的所有文件後，就可以在模擬器中運行。
注意：本文實例所使用的MIDLet都使用Eclipse IDE。關於為Eclipse創建MIDLet項目，請參考Getting Started with Mobile Java section of the Java™ ME Developer's Library（http://www.forum.nokia.com/main/resources/technologIEs/java/documentation/Java_ME_developers_library.htm）
也可以用命令行或者其他IDE創建結構。
注意：案例程序不能在SerIEs 40平台下運行。
如果在移動設備上開發測試，需要使用USB設備器、藍牙連接器、紅外線或者其他硬件兼容連接。二者選一，還可以使用OTA技術。
