1、建MessageUI類文件
2、入必要的類。
package com.nokia.example.location.tourist.ui;
import Javax.microedition.lcdui.Alert;
import Javax.microedition.lcdui.AlertType;
import Javax.microedition.lcdui.Gauge;
import com.nokia.example.location.tourist.TouristMIDlet;
3、建MessageUI類
/**
* VIEwer class containing a general suppose Alert notification(s).
*/
public class MessageUI
{
4、建方法，對於不支持API定位的時候發出警告。
/**
* Shows a alert that Location API is not supported.
*/
public static void showApiNotSupported()
{
Alert alert = new Alert("Information",
"Device do not support Location API", null, AlertType.INFO);
TouristMIDlet.getDisplay().setCurrent(alert);
}
5、建方法，不可獲取位置信息的時候發出警告。
/**
* Shows a alert that Location data is not available.
*/
public static void showLocationDataNotAvailable()
{
Alert alert = new Alert("Information",
"Location data is not yet available.", null, AlertType.INFO);
TouristMIDlet.getDisplay().setCurrent(alert);
}
6、建顯示定位提供狀態的對話。
/**
* Show a status dialog informing about state of location provider.
*/
public static void showLocationProviderState()
{
Gauge indicator = new Gauge(null, false, 50, 1);
indicator.setValue(Gauge.CONTINUOUS_RUNNING);
Alert alert = new Alert("Information",
"Please wait, looking for location data....", null,
AlertType.INFO);
alert.setIndicator(indicator);
TouristMIDlet.getDisplay().setCurrent(alert);
}
}
1、建PitchRollUI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.Graphics;
import Javax.microedition.location.OrIEntation;
import com.nokia.example.location.tourist.TouristMIDlet;
import com.nokia.example.location.tourist.model.ConfigurationProvider;
3、建PitchRollUI類，將其設置為Canvas擴展，並運行CommandListener和Runable。定義所需要的命令和常量，創建結構。
/**
* Viewer class that renders orIEntations pitch and roll values to meters.
*/
public class PitchRollUI extends Canvas implements CommandListener, Runnable
{
private CompassUI compass;
private float pitch = Float.NaN;
private float roll = Float.NaN;
/** Flag telling is the compass update thread active */
private boolean threadActive = false;
/** Sleep 1000ms during each compass update */
private final long SLEEPTIME = 1000;
private Command compassCmd = new Command("Compass", Command.BACK, 1);
public PitchRollUI(CompassUI compass)
{
this.compass = compass;
addCommand(compassCmd);
setCommandListener(this);
}
4、建方法，控制commpass線程的更新。
/**
* VM calls this method immediately prior to this Canvas being made visible
* on the display.
*/
protected void showNotify()
{
// Actives compass update thread.
threadActive = true;
new Thread(this).start();
}
/**
* VM calls this method shortly after the Canvas has been removed from the
* display.
*/
protected void hideNotify()
{
// Stops the thread.
threadActive = false;
}
5、該類創建run方法，需要更新角度、長度和長度並覆蓋canvas。更多信息參考Location API。
/**
* run method from Runnable interface. Updates azimuth, pitch and roll
* values and repaints the canvas.
*
* If OrIEntation is supported on the terminal, support level may be either
* 2D or 3D depending on the compass sensor. If the sensor providers only
* compass azimuth, pitch and roll values are Float.NaN.
*/
public void run()
{
// Run this thread until this displayable is not visiable.
// See also hideNotify() method.
while (threadActive)
{
Orientation orIEntation = ConfigurationProvider.getInstance()
.getOrIEntation();
if (orIEntation != null)
{
pitch = orIEntation.getPitch();
roll = orIEntation.getRoll();
}
repaint();
try
{
// Pause this thread for a secord before next update.
Thread.sleep(SLEEPTIME);
}
catch (InterruptedException e)
{
}
}
}
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)
{
// clean up canvas
g.setColor(255, 255, 255);
g.fillRect(0, 0, getWidth(), getHeight());
paintPitch(g);
paintRoll(g);
}
7、建方法，創建標尺。
/**
* Draws a customized meter with a scale.
*/
protected void drawMeter(Graphics g, int min, int max, int smallStep,
int largeStep, int baseline, int margin)
{
double position;
double scale = 100.0; // scale value to minimize rounding error
int x;
g.setColor(0x0000ff);
g.drawLine(margin, baseline, getWidth(), baseline);
for (int i = min; i <= max; i += smallStep)
{
position = (((i + max) * scale * (getWidth() - margin)) / (2 * max))
/ scale;
x = margin + (int) position;
g.drawLine(x, baseline - 3, x, baseline + 3);
}
for (int i = min; i <= max; i += largeStep)
{
position = (((i + max) * scale * (getWidth() - margin)) / (2 * max))
/ scale;
x = margin + (int) position;
g.drawLine(x, baseline - 5, x, baseline + 5);
}
}
8、建方法，覆蓋高度原值，賦予新的高度值。
/**
* Paint pitch meter and place the current pitch value to the meter.
*
* @param g -
* the Graphics object to be used for rendering the Canvas
*/
protected void paintPitch(Graphics g)
{
int baseline = 10;
int textAreaWidth = 50;
double position;
g.setColor(0x000000);
g.drawString("Pitch", 0, baseline - 5, Graphics.TOP | Graphics.LEFT);
g.drawString("-90", textAreaWidth + 1, baseline, Graphics.TOP
| Graphics.LEFT);
g.drawString("0", textAreaWidth + (getWidth() - textAreaWidth) / 2,
baseline, Graphics.TOP | Graphics.HCENTER);
g.drawString("+90", getWidth(), baseline, Graphics.TOP
| Graphics.RIGHT);
drawMeter(g, -90, 90, 10, 30, baseline, textAreaWidth);
// Draw the marker only if terminals pitch is available.
if (pitch != Float.NaN)
{
position = (((pitch + 90.0) * 100 * (getWidth() - textAreaWidth)) / (2
* 90)) / 100;
g.setColor(0x000000);
g.fillRect(textAreaWidth + (int) position - 3, baseline - 2, 5, 5);
}
}
9、建方法，覆蓋長度並賦予新的長度值。
/**
* Paint roll meter and place the current pitch value to the meter.
*
* @param g -
* the Graphics object to be used for rendering the Canvas
*/
protected void paintRoll(Graphics g)
{
int baseline = 40;
int textAreaWidth = 50;
double position;
g.setColor(0x000000);
g.drawString("Roll", 0, baseline - 5, Graphics.TOP | Graphics.LEFT);
g.drawString("-180", textAreaWidth + 1, baseline, Graphics.TOP
| Graphics.LEFT);
g.drawString("0", textAreaWidth + (getWidth() - textAreaWidth) / 2,
baseline, Graphics.TOP | Graphics.HCENTER);
g.drawString("+180", getWidth(), baseline, Graphics.TOP
| Graphics.RIGHT);
drawMeter(g, -180, 180, 15, 60, baseline, textAreaWidth);
// Draw the marker only if terminals roll is available.
if (roll != Float.NaN)
{
position = (((roll + 180.0) * 100 * (getWidth() - textAreaWidth)) / (2
* 180)) / 100;
g.setColor(0x000000);
g.fillRect(textAreaWidth + (int) position - 3, baseline - 2, 5, 5);
}
}
10、建事件，監控按鍵的輸入。
/**
* 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 == compassCmd)
{
TouristMIDlet.getDisplay().setCurrent(compass);
}
}
}
