I have one small problem with TableView I likend it my ObservableList and i can retrieve the results and put those into my tableview. However :
I call to my ObservableList each second
when i get the new result, I delete all the items in my table view and I add the new items
That works but ... each second if for example i select one row in my tableview the preselected column disappear after the table view is refresh... and I feel that is too haeavy. There are other solution ?
the part of my code that Is loading the info for each second is this one :
getColumns().addAll(symbol, bid, ask, high, low, created_at);
try {
setItems(getObservableList());
Timeline fiveSecondsWonder = new Timeline(new KeyFrame(Duration.seconds(2), new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
try {
setItems(getObservableList());
} catch (IOException e) {
e.printStackTrace();
}
}
}));
fiveSecondsWonder.setCycleCount(Timeline.INDEFINITE);
fiveSecondsWonder.play();
} catch (ParseException | IOException | SAXException | ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
first clean the items.
getItems().clear();
and second insert again.
setItems(getObservableList());
Related
I have a listview that I want to update with information from a textfile (rollcall.txt). Each time rollcall.txt is updated I am calling rollcall() (code below). The data is updated correctly in the text file before rollcall() is called, I have checked. The problem I have is that the listview doesnt show the updated entry until the next time I call rollcall() (I.E it always appears to be one update step behind).
Where am I going wrong?
public void rollcall(){
String[] splitdata = null;
try{
File myFile = new File(Environment.getExternalStorageDirectory() + "/rollcall.txt");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String aDataRow = "";
String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
splitdata = aBuffer.split("`"); //recover the file and split it based on `
myReader.close();
}
catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.logbooklayout, splitdata);
lv1.setAdapter(adapter);
adapter.notifyDataSetChanged(); //called to ensure updated data is refreshed into listview without reload
EDIT: rollcall is called from this method:
public void onClick(View v) {
if (v==badd){
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("ROLLCALL"); //Set Alert dialog title here
alert.setMessage("Enter data: "); //Message here
// Set an EditText view to get user input
final EditText input = new EditText(this);
alert.setView(input);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
//You will get as string input data in this variable.
// here we convert the input to a string and show in a toast.
add = input.getEditableText().toString();
try {
File myFile = new File(Environment.getExternalStorageDirectory() + "/rollcall.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile, true);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(add);
myOutWriter.append("`"); // ` used to split the file down later in lv section
myOutWriter.close();
fOut.close();
}
catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
} // End of onClick(DialogInterface dialog, int whichButton)
}); //End of alert.setPositiveButton
alert.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
dialog.cancel();
}
}); //End of alert.setNegativeButton
AlertDialog alertDialog = alert.create();
alertDialog.show();
rollcall();
}//end badd
}
Thanks for the help, I am new to using arrayadapters.
Andy
Short answer to your question is everything in UI thread is asynchronous and unless you somehow manage to freeze/lock the whole application you can't make the rest of your UI wait for your alert to grab the input. So long before you press "OK" button in your alert, your rollcall() method is being called from your onClick() function and whatever is inside your .txt file is being read/displayed on your UI, right behind your alert dialog hanging on for you to press one of the buttons, asynchronously.
Maybe the fastest solution to what you want to achieve is to call your rollcall() function somewhere else, after you confirm that your adapter's feeding data has actually been changed. If you must call it from within onClick() function, without questioning your reasons to do so, you should call it inside the try{} block, right after you close the output stream.
Like this:
try {
File myFile = new File(Environment
.getExternalStorageDirectory() + "/rollcall.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile, true);
OutputStreamWriter myOutWriter = new OutputStreamWriter(
fOut);
myOutWriter.append(add);
myOutWriter.append("`"); // ` used to split the
// file down later
// in lv section
myOutWriter.close();
fOut.close();
rollcall();
}
The reason this "works" is you already declared the listener for your "OK" button and whenever you press it, whatever inside your EditText input will be written on file. In order to make it work as before I think you need superhuman skills to write some text on alert dialog and click on button before rollcall() function is called in the same scope.
Obviously the better way to do update the list view is to be able to use adapter.notifyDataSetChanged() but I believe you should call it somewhere else than where you write on your file and in that case your adapter must be declared outside the scope of rollcall() function.
Anyways in order to show how it all goes on I created a simple(rather ugly) android application and put some logs on where the mysterious stuff is happening:
public class MainActivity extends Activity {
private ListView lv1;
private Button refreshButton;
ArrayAdapter<String> adapter;
String[] splitdata;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
refreshButton = (Button) findViewById(R.id.refreshButton);
lv1 = (ListView) findViewById(R.id.someTextViewId);
refreshButton.setOnClickListener(myButtonhandler);
splitdata = null;
}
View.OnClickListener myButtonhandler = new View.OnClickListener() {
public void onClick(View v) {
Log.d("main", "la noliy");
someFunction();
}
};
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void someFunction() {
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("ROLLCALL"); // Set Alert dialog title here
alert.setMessage("Enter data: "); // Message here
// Set an EditText view to get user input
final EditText input = new EditText(this);
alert.setView(input);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// You will get as string input data in this
// variable.
// here we convert the input to a string and show in
// a toast.
String add = input.getEditableText().toString();
try {
File myFile = new File(Environment
.getExternalStorageDirectory() + "/rollcall.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile, true);
OutputStreamWriter myOutWriter = new OutputStreamWriter(
fOut);
myOutWriter.append(add);
myOutWriter.append("`"); // ` used to split the
// file down later
// in lv section
myOutWriter.close();
fOut.close();
if (splitdata.length > 0) {
rollcall(new String("call from inside"));
}
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
} // End of onClick(DialogInterface dialog, int
// whichButton)
}); // End of alert.setPositiveButton
alert.setNegativeButton("CANCEL",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
dialog.cancel();
}
}); // End of alert.setNegativeButton
AlertDialog alertDialog = alert.create();
alertDialog.show();
Log.d("someFunction", "before rollcall");
Log.d("someFunction", "location: "
+ Environment.getExternalStorageDirectory().getAbsolutePath());
rollcall(new String("call from outside"));
Log.d("someFunction", "after rollcall");
}// end badd
public void rollcall(String message) {
Log.d("rollcall", message);
try {
File myFile = new File(Environment.getExternalStorageDirectory()
+ "/rollcall.txt");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(new InputStreamReader(
fIn));
String aDataRow = "";
String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
splitdata = aBuffer.split("`"); // recover the file and split it
// based on `
myReader.close();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT)
.show();
}
int length = splitdata.length;
for (int i = 0; i < length; i++) {
Log.d("rollcall", splitdata[i]);
}
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, splitdata);
lv1.setAdapter(adapter);
}
}
I put a button and an onClickListener to it. The first time you press the button everything is called, listview is updated and your dialog is hanging on your screen for either of the buttons to be pressed:
And you will see a log like this:
07-26 04:09:20.802: D/someFunction(11273): before rollcall
07-26 04:09:20.802: D/someFunction(11273): location: /mnt/sdcard
07-26 04:09:20.802: D/rollcall(11273): call from outside
07-26 04:09:20.802: D/rollcall(11273): some data
07-26 04:09:20.802: D/rollcall(11273): some other data
07-26 04:09:20.812: D/someFunction(11273): after rollcall
You can see that rollcall() has been called from outside and not inside of your try/catch block since there is also another call from there to rollcall(). But when you press the button your try/catch block will do it's job inside your onClick() function and rollcall() will be called afterwards. Hence your listview wil be updated with new data you just entered in the dialog:
Here is the final part of log right after you press "OK" you can see that rollcall() is being called and it can read the new data:
07-26 04:09:46.347: D/rollcall(11273): call from inside
07-26 04:09:46.357: D/rollcall(11273): some data
07-26 04:09:46.357: D/rollcall(11273): some other data
07-26 04:09:46.357: D/rollcall(11273): new data
Finally, I'm sure there are a lot of ugliness in this whole approach to your problem. Bottom line is you need to know that everything happening in the UI thread is asynchronous and no one is waiting for you to enter data inside your dialog in that onClick() function. You should update your listview somewhere else with a more elegant approach in case your application throws an exception for example around that try/catch block. At least maybe you should add a finally{} block at the end of it and update your listview in there even though the try part fails. Hope this answered your question:)
PS. For those who want to try this at home, remember to provide a TextView id from your layout.xml file to the findViewById() function to get the ListView reference in your code, not an actual ListView id. Yeah, I know...
call adapter.notifyDataSetChanged() everytime you update your adapter, then listview will automatically be updated
I suggest you run rollcall as an asychronous task for 2 reasons. First, it will not stop your UI when rollcall() is running.
Second, you will be able to call onPostExecute(Object o) wher you can call `adapter.notifyDataSetChanged(); '
How do I close a stage in JavaFX 2 after some specific external event has occurred? Suppose I have a stage with a simple progress bar that is filled up by a Task (borrowed from another answer):
Task<Void> task = new Task<Void>(){
#Override
public Void call(){
for (int i = 1; i < 10; i++) {
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(i);
updateProgress(i, 10);
}
return null;
}
};
How do I close the window automatically (and open the next one) after the Task is done and the ProgressBar is filled to 100%?
Before return null; you can add
Platform.runLater(
new Runnable() {
public void run() {
stage.close();
}
}
);
or
progressBar.progressProperty().addListener(new ChangeListener<Number>(){
//add checking, that progress is >= 1.0 - epsilon
//and call stage.close();
})
The first is better. But note, that task is done on a separate thread. so you should put a request on stage.close() on JFX thread using special call.
Also, jewelsea provides links on stage closing questions in comment to the question.
once again I need some help:
yesterday I asked this question that was about the way to use a large jpg image as a Bitmap (http://stackoverflow.com/questions/13511657/problems-with-big-drawable-jpg-image) and I resolved myself (Is my own response on that question) but whenever I resume my activity, as it uses that bitmap as the GLRenderer texture it crashes. I've tried many things, the last try was to make that bitmap static in order to keep it as a member variable into the activity but it crashes because, I supose, it looses it's mBuffer.
More details on the Activity code:
I declared it as SingletonInstance into the manifest:
android:launchMode="singleInstance"
in order to keep the tiles for the renderer.
and here some code:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mGLSurfaceView = new GLSurfaceView(this);
mGLSurfaceView.setEGLConfigChooser(true);
mSimpleRenderer = new GLRenderer(this);
getTextures();
if (!mIsTileMapInitialized){
tileMap = new LandSquareGrid(1, 1, mHeightmap, mLightmap, false, true, true, 128, true);
tileMap.setupSkybox(mSkyboxBitmap, true);
mIsTileMapInitialized = true;
}
initializeRenderer();
mGLSurfaceView.setRenderer(mSimpleRenderer);
setContentView( R.layout.game_layout );
setOnTouchListener();
initializeGestureDetector();
myCompassView = (MyCompassView)findViewById(R.id.mycompassview);
// Once set the content view we can set the TextViews:
coordinatesText = (TextView) findViewById(R.id.coordDynamicText);
altitudeText = (TextView) findViewById(R.id.altDynamicText);
directionText = (TextView) findViewById(R.id.dirDynamicText);
//if (!mIsGLInitialized){
mOpenGLLayout = (LinearLayout)findViewById(R.id.openGLLayout);
mOpenGLLayout.addView(mGLSurfaceView);
mVirtual3DMap = new Virtual3DMap(mSimpleRenderer, tileMap);
if (mGameThread == null){
mGameThread = new Thread(mVirtual3DMap);
mGameThread.start();
}
}
On getTextures method I get few small textures and the largest one as in my last question self response:
if (mTerrainBitmap==null){
InputStream is = getResources().openRawResource(R.drawable.terrain);
try {
// Set terrain bitmap options to 16-bit, 565 format.
terrainBitmapOptions.inPreferredConfig = Bitmap.Config.RGB_565;
Bitmap auxBitmap = BitmapFactory.decodeStream(is, null, terrainBitmapOptions);
mTerrainBitmap = Bitmap.createBitmap(auxBitmap);
}
catch (Exception e){
}
finally {
try {
is.close();
}
catch (IOException e) {
// Ignore.
}
}
}
So, again, first time it works great but when I go back I do:
protected void onPause() {
super.onPause();
mGLSurfaceView.onPause();
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
if (mVirtual3DMap != null) {
try {
mVirtual3DMap.cancel();
mGameThread=null;
mVirtual3DMap = null;
mGLSurfaceView.destroyDrawingCache();
mSimpleRenderer=null;
System.gc();
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
And whan I resume the activity:
#Override
protected void onResume() {
super.onResume();
mGLSurfaceView.onResume();
if (mVirtual3DMap != null) {
try {
mVirtual3DMap.resume();
} catch (Throwable e) {
e.printStackTrace();
}
}
}
And it crashes.
Why?? Ok, here is the exception cause on the GLThread:
java.lang.IllegalArgumentException: bitmap is recycled...
I tried this messy stuff because launching more than two times the original activity the application crashes bacuse of this or because of the amount of memory used and now I don't know if revert all these changes or what todo with this.
Is there a good way to keep in memory and usable, by this or another application activity, this bitmap?
Please, I need your advices.
Thanks in advance.
Do not handle resources manually or your app's surface will broke up. You can't handle your resources manually.
If you worry about reloading resources and you use API level 11+, you can use setPreserveEGLContextOnPause(). It will perserve your textures and FBOs.
If you can't use API 11+, you can port GLSurfaceView() to your app. You can check my own GLSurfaceView that is ported from ICS.
PS: Sorry about my poor english.
No. Let Android handle all the resources. You must handle the appropriate events and reload the bitmap when the activity is resumed. You cannot expect, that any OpenGL handles are still valid after the activity has been resumed.
Think of it as in the example of a laptop coming out from hibernation. Although all memory has been restored, you cannot expect that any open socket has still a real active connection going.
I am an Android noobie, so please correct me if I am wrong.
I would like to start editing after adding new row into TableView.
I copied example from Oracle website: Using JavaFX UI Controls - 13 Table View. Then I put additional button for adding new row and define action for the button.
final Button addButton = new Button("Add");
addButton.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent arg0) {
Person p = new Person("", "", "");
table.getItems().add(p);
table.getSelectionModel().select(p);
table.edit(table.getSelectionModel().getSelectedIndex(), table.getColumns().get(2));
}
});
In result I can see selected new row but the table doesn't start edditing in the third column.
I have similar method for editing existing rows and it works properly.
final Button editButton = new Button("Edit");
editButton.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent arg0) {
table.edit(table.getSelectionModel().getSelectedIndex(), table.getColumns().get(2));
}
});
Could you help me what I do wrong?
The app is like a small dictionary. I have a listbox and a textbox. The list box is already filled with words and when there is any entry in the textbox the listbox is refilled again with words starting with the letters in the textbox. I have a listbox SelectionChanged event implemented when the user clicks on a word its meaning appears. The problem is when user selects a word from the list and then types something in the textbox, listBox SelectionChanged event is called i dont want this to happen because at this point of time my listbox's selected item is empty.I would like to have a event that is fired only when user selects something from the listbox. It should not be fired when the content of the listbox changes. Thank you
You can use
1.if (lstWords.SelectedItem != null)
2.lstWords.SelectedIndex = -1;
for e.g. following is the source code for text changed event and list selection change event
private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
{
try
{
if (textBox1.Text.ToString().Equals(""))
{
XmlDictionaryRepository test = new XmlDictionaryRepository();
lstWords.ItemsSource = test.GetWordList(categorySelected,xmlFileName);
}
else
{
XmlDictionaryRepository test = new XmlDictionaryRepository();
lstWords.ItemsSource = test.GetMatchWordList(categorySelected, textBox1.Text.ToString(),xmlFileName);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString(), (((PhoneApplicationFrame)Application.Current.RootVisual).Content).ToString(), MessageBoxButton.OK);
}
}
private void lstWords_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
try
{
if (lstWords.SelectedItem != null)
{
string wordSelected = ((Glossy_Test.Dictionary)(lstWords.SelectedItem)).Word;
if (lstWords.SelectedItem != null)
{
NavigationService.Navigate(new Uri(string.Format("/DescribeWord.xaml?param1={0}¶m2={1}", wordSelected, categorySelected), UriKind.Relative));
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString(), (((PhoneApplicationFrame)Application.Current.RootVisual).Content).ToString(), MessageBoxButton.OK);
}
finally
{
// lstWords.SelectedIndex = -1;
}
}