Problems to make my first application work
Hello, I am new in the development of blackberry applications, but not new in development (C++, C, c#, JAVA).
I am facing some problems with my first development for the blackberry in JAVA platform.
MyScreen code:
public final class MyScreen extends MainScreen
{
EncodedImage mImage = EncodedImage
.getEncodedImageResource("icon.png");
ApplicationIcon mIcons = new ApplicationIcon(mImage);
ApplicationIcon mIcon = mIcons;
private static Date cDate;
private String lefteds = "";
private LabelField leftd = new LabelField("Not set");
private TextBoxField tbf = new TextBoxField(200, 30);
// private GridFieldManager grid = new GridFieldManager(3,3,1);
//private VerticalFieldManager _manager;
private LabelField Leftd2 = new LabelField("Not set");
private int Inum = -1;
//-----------------------------------------------
private static PersistentObject store = PersistentStore.getPersistentObject(0x1dfc10ec6454eb14L);
public void saveUserInfo(){
synchronized(store) {
store.setContents(leftd);
store.commit();
}
}
public LabelField getlefted() {
LabelField leftd;
synchronized(store) {
leftd = (LabelField)store.getContents();
if(leftd == null) {
leftd = new LabelField("Not Set!");
}
}
return leftd;
}
//-----------------------------------------------
MenuItem menuRegister = new MenuItem("Add status icon", 0, 0) {
public void run() {
registerIndicator();
};
};
MenuItem menuUnregister = new MenuItem("Remove status icon", 0, 0) {
public void run() {
unregisterIndicator();
};
};
protected void makeMenu(Menu menu, int instance) {
super.makeMenu(menu, instance);
menu.add(menuRegister);
menu.add(menuUnregister);
}
private void registerIndicator() {
try {
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry
.getInstance();
ApplicationIndicator indicator =
reg.register(mIcon, false, true);
indicator.setVisible(true);
} catch (Exception e) {
}
}
private void unregisterIndicator() {
try {
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry
.getInstance();
reg.unregister();
} catch (Exception e) {
}
}
void updateValue(int value) {
try {
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry
.getInstance();
ApplicationIndicator appIndicator =
reg.getApplicationIndicator();
appIndicator.setValue(value);
} catch (Exception e) {
}
}
void updateIcon(ApplicationIcon icon) {
try {
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry
.getInstance();
ApplicationIndicator appIndicator =
reg.getApplicationIndicator();
appIndicator.setIcon(icon);
} catch (Exception e) {
}
}
//--------------------------------------------------
public MyScreen()
{
try
{
this.Leftd2.setText(getlefted().getText());
}
catch (Exception e)
{
}
Background bg = BackgroundFactory.createSolidBackground(Color.LIGHTGRAY);
setBackground(bg);
XYEdges edges = new XYEdges(20, 20, 20, 20);
Border border = BorderFactory.createBevelBorder(edges);
// Set the displayed title of the screen
setTitle("CountDown");
ButtonField b = new ButtonField("Set CountDown", ButtonField.CONSUME_CLICK);
b.setChangeListener(customListener);
add(b);
this.tbf.setText("Days to go!");
add(Leftd2);
add(this.tbf);
if (this.Leftd2 == null)
{
saveUserInfo();
}
}
public void calculate()
{
Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
c.setTime(new Date(System.currentTimeMillis())); //now
Date currentdate = c.getTime();
int lefted = (int)((cDate.getTime() - currentdate.getTime()) / (1000 * 60 * 60 * 24)) + 1;
lefteds = lefted + "";
leftd.setText(lefted + " " + this.tbf.getText());
Leftd2.setText(lefted + " " + this.tbf.getText());
saveUserInfo();
this.Inum = lefted;
updateValue(lefted);
}
FieldChangeListener customListener = new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
DateTimePicker datePicker = DateTimePicker.createInstance();
datePicker.doModal();
Calendar cal = datePicker.getDateTime();
Date date = cal.getTime();
MyScreen.cDate = date;
calculate();
}
};
}
It's part * beep * ugly code and also, my application
There are some problems with it (apart from the fact that its badly coded, etc.).
Why is my device reboots as a minute after I launch my app (while the app completely closed)?
Is why I set the status bar would not appear as it should?
I hope that someone here would be able to help me, I'm sort of stuck... I must be trying to include to the top of my own for almoste time.
Thank you very much.
"I have being trying to understand by myself for almost an hour."
What - only an hour?
There is a little run before you can walk through this code, suggest a slightly lower rate.
Two things that I would look at first.
(1) but first reboot the device. I'm guessing that you have an older device and you compile using a more recent environment. Do not forget the applications being forward but not backward compatible, you should develop with a JDE older than the operating system on your device.
Allied to this I'll make sure your app is not started automatically.
(2) you seem to try to persist a LabelField:
public void saveUserInfo() {}
{Synchronized (Store)}
store.setContents (leftd);
Store.Commit ();
}
}
public getlefted() {} LabelField
LabelField leftd;
{Synchronized (Store)}
leftd = (LabelField) store.getContents ();
if(leftd == null) {}
leftd = new LabelField ("Not Set!");
}
}
Return leftd;
}
To be persistent, an object must implement Persistable. LabelField doesn't do this. If you want to save a LabelField, what you save is the text (a string that is persistent) and recreate it.
See how you go after looking through this. But I recommend to start simple (just count) before adding things as indicators and persistentStore.
Tags: BlackBerry Developers
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