I am trying to detect when the shift key (either side) is held down by the user (without pressing any other keys), but I can't figure out to do this. This is the only thing I found to detect pressing a shift key:
protected boolean keyStatus(int keycode, int time)
{
System.out.println("down");
boolean retVal = false;
int key = Keypad.key(keycode);
if( key == Keypad.KEY_SHIFT_LEFT )
{
// do something
retVal = true;
}
else if( key == Keypad.KEY_SHIFT_RIGHT )
{
// do something
retVal = true;
}
return retVal;
}
Shift doesn't trigger keyDown and keyUp, which would have been ideal. What am I missing?
Does holding down the shift key trigger multiple keypresses? If so, you could write a function to detect a certain number of keypresses within a given amount of time.
Related
Hi I am using a text watcher on edit text
I want to restrict the number after certain length
suppose i want restrict length for 3
It should not allow 1234
but it should allow 123.(except dot(.) it should not allow any other character)
How can i do with TextWatcher.
Also tried to restrict all key entries except dot but not working
insideEdit.setOnKeyListener(new OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == 46) // dot key code is 46
{
return false;
}else {
return true;
}
}
});
Use
android:maxLength="4"
inside <EditText tag
I am working on ListView section, in this, the user can search the content by name and directly move at the first element of List via pressing a keyboard button. Like, if you press button B from (right vertical manager) it will scroll the list and move focus to first record of B.
The code is working fine in simulator but it's not working on Touch device - I have BB 9380 Curve.
here is the code for :
LabelField a = new LabelField("A" , FOCUSABLE)
{
protected void paint(Graphics graphics)
{
graphics.setColor(0xC4C4C4);
super.paint(graphics);
}
protected boolean navigationClick(int status, int time)
{
//fieldChangeNotify(1);
injectKey(Characters.LATIN_CAPITAL_LETTER_A);
injectKey(Characters.LATIN_CAPITAL_LETTER_A);
return true;
}
};
private void injectKey(char key)
{
try
{
searchList.setFocus();
KeyEvent inject = new KeyEvent(KeyEvent.KEY_DOWN, key, 0);
inject.post();
/*inject.post();*/
} catch (Exception e) {
Log.d("In injectKey :: :: :: "+e.toString());
MessageScreen.msgDialog("In Inject Key "+e.toString());
}
}
Alternate Solution
I would recommend a different strategy for this. Instead of trying to simulate key press events, I would define one method that handles a keypress of a certain letter, or a touch click on that same letter's LabelField.
Source: blackberry.com
So, you can have code that handles key presses by using
protected boolean keyChar( char character, int status, int time )
{
// you might only want to do this for the FIRST letter entered,
// but it sounds like you already have the keypress handling
// the way you want it ...
if( CharacterUtilities.isLetter(character) )
{
selectLetter(character);
return true;
}
return super.keyChar( character, status, time );
}
and then also handle touch events:
LabelField a = new LabelField("A" , FOCUSABLE)
{
protected void paint(Graphics graphics)
{
graphics.setColor(0xC4C4C4);
super.paint(graphics);
}
protected boolean navigationClick(int status, int time)
{
char letter = getText().charAt(0);
selectLetter(letter);
return true;
}
};
then, simply define a method that takes in one character, and scrolls to the start of that part of the list:
private void selectLetter(char letter);
Key Injection
If you really, really want to simulate key presses, though, you might try changing the code so that it injects two events: key down, and then key up (you're currently injecting two key down events). This might be causing problems.
injectKey(Characters.LATIN_CAPITAL_LETTER_A, true);
injectKey(Characters.LATIN_CAPITAL_LETTER_A, false);
with
private void injectKey(char key, boolean down)
{
try
{
searchList.setFocus();
int event = down ? KeyEvent.KEY_DOWN : KeyEvent.KEY_UP;
KeyEvent inject = new KeyEvent(event, key, 0);
inject.post();
} catch (Exception e) { /** code removed for clarity **/
}
}
Additional Note
For UIs, I like to trigger events on the key up, or unclick events. I think this makes a better experience for the user. So, you could replace keyChar() with keyUp() and navigationClick() with navigationUnclick() if you want to do this.
I am implementing a simple app, where in the registration page user can select news categories. Requirements are below
All the categories are the CheckBoxField's. User have to select at least one category.
Select all CheckBox will allow to select all/deselect all categories CheckBox.
If user manually selects all checkbox fields then "Select All" checkbox must be selected.
Approaches: I have created the categories checkbox in a loop.
for(int i=0;i<interests.length;i++){
allFields[i] = new ColorCheckBoxField(interests[i], false, checkBoxStyle | USE_ALL_WIDTH);
allFields[i].setCookie(i+"");
allFields[i].setFont(bodyFont);
allFields[i].setChangeListener(new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
ColorCheckBoxField tempChoice = (ColorCheckBoxField)field;
int index =Integer.parseInt(tempChoice.getCookie().toString().trim());
//set the selection
if(tempChoice.getChecked()){
parent.selectInterest(index);
}
boolean flag = true;
int[] intrests = parent.getSelectedInterest();
for (int i = 0; i < intrests.length; i++) {
if(intrests[i]==0){
flag = false;
}
}
if(flag==true){
selectAll.setChecked(flag); // select all is Checkbox object
}else{
selectAll.setChecked(false);
}
}
});
vfm.add(allFields[i]);
}
My selectAll checkbox logic is
selectAll = new ColorCheckBoxField("Select All", false, checkBoxStyle | USE_ALL_WIDTH);
selectAll.setChangeListener(new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
ColorCheckBoxField temp = (ColorCheckBoxField) field;
//if (context == FieldChangeListener.PROGRAMMATIC ) {
checkAll(temp.getChecked()); // it loops through all checkbox and set them checked
//}
}
});
innerHfm.add(selectAll);
I understand the problem, its due to infinite loop. I have used "FieldChangeListener.PROGRAMMATIC" but that wont help because i want the field listener to work for both pragmatically and manually. I don't have any option left to fix. Any hack will help me?
That's correct that you have to use FieldChangeListener.PROGRAMMATIC. But you have to use it with interest checkboxes instead of using it for selectAll checkbox.
Please add one defensive check to FieldChangeListener for interest checkboxes:
if ( nonProgrammaticChange(context) ) {
ColorCheckBoxField tempChoice = (ColorCheckBoxField)field;
int index = Integer.parseInt(tempChoice.getCookie().toString().trim());
...
}
Where nonProgrammaticChange is:
private boolean nonProgrammaticChange (int context) {
return (context & FieldChangeListener.PROGRAMMATIC) != FieldChangeListener.PROGRAMMATIC;
}
I see bug in your code - you don't clear interest in parent if checkbox is unchecked.
Minor improvements as for me - use Vector where you'll store indexes of selected checkboxes. This will allow to replace this code:
boolean flag = true;
int[] intrests = parent.getSelectedInterest();
for ( int i = 0; i < intrests.length; i++ ) {
if( intrests[i] == 0 ) {
flag = false;
}
}
To this code:
selectedInterestIndexes.size() == interests.length
And probably this will give you less iteration in other places.
As well I would work more on removal of duplicates and code readability.
yesterday i asked one question and got the answer from our friend here, and i ran successfully, also it have one problem with it. "Yester day My question is, when we selecting the drop down list then it should be shown by a label as "1" at very first time, again it'll be increas by selection", this is what the answer i got..,
static int count = 0;
private void bind()
{
ArrayList ar = new ArrayList();
ar.Add("first");
ar.Add("Second");
ar.Add("Third");
ar.Add("Four");
ar.Add("Five");
ar.Add("Six");
ar.Add("Seven");
CCddl.DataSource = ar;
CCddl.DataBind();
}
protected void CCddl_SelectedIndexChanged(object sender, EventArgs e)
{
if (count == 0) count = 1;
Label12.Text = count++.ToString();
}
this code worked, but once the running window getting closed, then it lose the continuation, i mean again application getting run it'll shown again "1". But exactly what i want is, the number continuation should be end when the system day has change.
Try using the Application Settings feature. I added two user settings CountDate and Count in the Project->Property's->Settings and changed your SelectedIndexChangedEvent to
protected void CCddl_SelectedIndexChanged(object sender, EventArgs e)
{
if (count == 0) count = 1;
Label12.Text = count++.ToString();
Properties.Settings.Default.CountDate = DateTime.Now.Date;
Properties.Settings.Default.Count = count;
Properties.Settings.Default.Save();
}
And right before you call your Bind Method during your form initialization put something like this.
if(Properties.Settings.Default.CountDate.Date != DateTime.Now.Date)
{
Properties.Settings.Default.Count = 0;
Properties.Settings.Default.CountDate = DateTime.Now.Date;
Properties.Settings.Default.Save();
}
else
count = Properties.Settings.Default.Count;
bind();
Added the Property Settings Image
You should somehow store the value in a database or something. With the date value. Then when the datechanges you just reset the value.
I need to get the text of the keys at the event of key press in Blackberry. This happens when the user presses a key from the the keypad in order to type text. How is that possible?
you can get the pressed key text by overriding keyChar like this
public boolean keyChar(char key, int status, int time)
{
if (key == Characters.ESCAPE)
{
int result = Dialog.ask(Dialog.D_YES_NO,"Are you sure you want to exit?");
if (result == Dialog.YES) {
closePopup();
}
return(true);
}
else
if (key == Characters.ENTER)
{
processLocation();
return(true);
}
else
{
//the pressed key is key
return(super.keyChar(key,status,time));
}
}
This helps you:
protected boolean keyChar(char ch, int status, int time)
{
if(ch == Characters.ESCAPE || ch == Characters.ENTER)
{
//Nothing to do;
}
else
{
pressedKey=pressedKey+ch;
}
return super.keyChar(ch, status, time);
}
Then you can get the values in pressedKey(it is a String variable you have to declare it first).