When I drag an item that contains html-text then users see html string.
I use RAP 2.3
I use code based on the public Eclipse RAP examples. And I can not find the way to change feedback effect when user start a drag action.
Tree tree = new Tree( parent, SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION );
TreeViewer result = new TreeViewer( tree );
result.setContentProvider( new TreeContentProvider() );
TreeLabelProvider labelProvider = new TreeLabelProvider( parent.getDisplay(), MODERN_STYLE );
result.setLabelProvider( labelProvider );
result.setInput( createModel() );
result.expandAll();
Transfer[] types = new Transfer[] { TreeObjectTransfer.getInstance() };
TreeDragListener dragListener = new TreeDragListener( viewer );
viewer.addDragSupport( DND.DROP_MOVE, types, dragListener );
TreeDropListener dropListener = new TreeDropListener( viewer );
viewer.addDropSupport( DND.DROP_MOVE, types, dropListener );
And DragSourceAdapter:
private static class TreeDragListener extends DragSourceAdapter {
private final TreeViewer viewer;
private Object dragData;
TreeDragListener( TreeViewer viewer ) {
this.viewer = viewer;
}
#Override
public void dragStart( DragSourceEvent event ) {
dragData = getTreeObject( event.x, event.y );
}
#Override
public void dragSetData( DragSourceEvent event ) {
event.data = dragData;
}
#Override
public void dragFinished( DragSourceEvent event ) {
viewer.refresh();
}
private TreeObject getTreeObject( int x, int y ) {
TreeObject result = null;
ViewerCell cell = viewer.getCell( new Point( x, y ) );
if( cell != null ) {
result = ( TreeObject )cell.getElement();
}
return result;
}
}
RESULT:
Finally, I don't find a good solution so I replaced attributes of the html-tags with next methods cell.setFont() and cell.setForeground(). In this case this bug with feedback effect has not occurs.
Related
I want to open new activity that is different in each recyclerview item.
I have read and I do not need an image item here : How to open a different activity on recyclerView item onclick
This is my Adapter
public class B001Adapter extends RecyclerView.Adapter {
private Context context;
private LayoutInflater inflater;
List<B001Data> udata = Collections.emptyList();
public B001Adapter(Context context, List<B001Data> data) {
this.context = context;
inflater = LayoutInflater.from(context);
this.udata = data;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.datab001, parent, false);
MyHolder holder = new MyHolder(view);
return holder;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
MyHolder myHolder = (MyHolder) holder;
final B001Data current = udata.get(position);
myHolder.device_name.setText(current.device_name);
myHolder.mac_address.setText(current.mac_address);
myHolder.status.setText("Status:" + String.valueOf(current.status));
}
#Override
public int getItemCount() {
return udata.size();
}
class MyHolder extends RecyclerView.ViewHolder {
TextView device_name, mac_address, status;
public MyHolder(View itemView) {
super(itemView);
context = itemView.getContext();
device_name = (TextView) itemView.findViewById(R.id.txt_device_name);
mac_address = (TextView) itemView.findViewById(R.id.txt_mac_address);
status = (TextView) itemView.findViewById(R.id.txt_status);
}
public void onClick(AdapterView<?> parent, View view, int position {
final Intent intent;
switch (getAdapterPosition()){
case 0:
intent = new Intent(context, MainActivity.class);
break;
case 1:
intent = new Intent(context, B001FacilityM.class);
break;
case 2:
intent = new Intent(context, B001HRD.class);
break;
default:
intent = new Intent(context, B001home.class);
break;
}
context.startActivity(intent);
}
}
}
I use volley to get Json data displayed on the recyclerView. Looking for your advice. Thanks
First You Should assign id to layout file (R.layout.datab001),
find out id using findViewsById in MyHolder() constructor
and then set onClickListener to layout like myHolder.layout.setOnClickListener(....);
in onBindViewHolder().
or check other answer
RecyclerView onClick
I have rendered google map and pins in the map with googlemaps package in xamarin forms. I want to display title of all pins by default.
I tried
map.SelectedPin = pinname
but it works for only one pin.
Any help will be appreciated
You have to extend the Map class, to create a Bindable list of Pins.
public class BindableMap : Map {
public static readonly BindableProperty MapPinsProperty = BindableProperty.Create(
nameof(Pins),
typeof(ObservableCollection<Pin>),
typeof(BindableMap),
new ObservableCollection<Pin>(),
propertyChanged: (b, o, n) =>
{
var bindable = (BindableMap)b;
bindable.Pins.Clear();
var collection = (ObservableCollection<Pin>)n;
foreach (var item in collection)
bindable.Pins.Add(item);
collection.CollectionChanged += (sender, e) =>
{
Device.BeginInvokeOnMainThread(() =>
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Replace:
case NotifyCollectionChangedAction.Remove:
if (e.OldItems != null)
foreach (var item in e.OldItems)
bindable.Pins.Remove((Pin)item);
if (e.NewItems != null)
foreach (var item in e.NewItems)
bindable.Pins.Add((Pin)item);
break;
case NotifyCollectionChangedAction.Reset:
bindable.Pins.Clear();
break;
}
});
};
});
public IList<Pin> MapPins { get; set; }
}
Then, in your ViewModel
private ObservableCollection<Pin> _pinCollection = new ObservableCollection<Pin>();
public ObservableCollection<Pin> PinCollection { get { return _pinCollection; } set { _pinCollection = value; OnPropertyChanged(); } }
To add a simple pin:
PinCollection.Add(new Pin() { Position = YourPosition, Type = PinType.Generic, Label ="ABCD" });
You can now easily reference this control, with this XAML.
<local:BindableMap MapType="Street" MapPins="{Binding PinCollection}" />
I am building an android application that shows autocomplete feature and fetches autocomplete predictions in google maps using - GeoDataApi.getAutocompletePredictions. I followed this tutorial - https://github.com/googlesamples/android-play-places/blob/master/PlaceComplete/Application/src/main/java/com/example/google/playservices/placecomplete/PlaceAutocompleteAdapter.java
But somehow this is not working fine for me.
My class is this -
public class GooglePlacesAutoCompleteAdapter extends ArrayAdapter implements Filterable {
private ArrayList<PlaceAutocomplete> mResultList;
GoogleApiClient mGoogleApiClient;
private LatLngBounds mBounds;
private AutocompleteFilter mPlaceFilter;
int radius = 500;
public GooglePlacesAutoCompleteAdapter(Context context, int textViewResourceId, GoogleApiClient googleApiClient,
Location lastLocation, AutocompleteFilter filter) {
super(context, textViewResourceId);
LatLng currentLatLng = new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude());
mBounds = Utility.boundsWithCenterAndLatLngDistance(currentLatLng, 500, 500);
mGoogleApiClient = googleApiClient;
mPlaceFilter = filter;
}
#Override
public int getCount() {
return mResultList.size();
}
#Override
public PlaceAutocomplete getItem(int index) {
return mResultList.get(index);
}
#Override
public android.widget.Filter getFilter() {
Filter filter = new Filter() {
#Override
public FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
if (constraint != null && constraint.length() > 3 && constraint.length()%3 == 1) {
// Retrieve the autocomplete results.
mResultList = autocomplete(constraint.toString());
// Assign the data to the FilterResults
filterResults.values = mResultList;
filterResults.count = mResultList.size();
}
return filterResults;
}
#Override
public void publishResults(CharSequence constraint, FilterResults results) {
if (results != null && results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
return filter;
}
public ArrayList<PlaceAutocomplete> autocomplete(String input) {
if (mGoogleApiClient.isConnected()) {
// Submit the query to the autocomplete API and retrieve a PendingResult that will
// contain the results when the query completes.
PendingResult results = Places.GeoDataApi.getAutocompletePredictions(mGoogleApiClient, input.toString(),
mBounds, mPlaceFilter);
// This method should have been called off the main UI thread. Block and wait for at most 60s
// for a result from the API.
AutocompletePredictionBuffer autocompletePredictions = (AutocompletePredictionBuffer)results.await(60, TimeUnit.SECONDS);
// Confirm that the query completed successfully, otherwise return null
final Status status = autocompletePredictions.getStatus();
if (!status.isSuccess()) {
//Toast.makeText(getContext(), "Error contacting API: " + status.toString(),Toast.LENGTH_SHORT).show();
//Log.e(TAG, "Error getting autocomplete prediction API call: " + status.toString());
autocompletePredictions.release();
return null;
}
// Copy the results into our own data structure, because we can't hold onto the buffer.
// AutocompletePrediction objects encapsulate the API response (place ID and description).
Iterator<AutocompletePrediction> iterator = autocompletePredictions.iterator();
ArrayList resultList = new ArrayList<>(autocompletePredictions.getCount());
while (iterator.hasNext()) {
AutocompletePrediction prediction = iterator.next();
// Get the details of this prediction and copy it into a new PlaceAutocomplete object.
resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getDescription()));
}
// Release the buffer now that all data has been copied.
autocompletePredictions.release();
return resultList;
}
//Log.e(TAG, "Google API client is not connected for autocomplete query.");
return null;
}
class PlaceAutocomplete {
public CharSequence placeId;
public CharSequence description;
PlaceAutocomplete(CharSequence placeId, CharSequence description) {
this.placeId = placeId;
this.description = description;
}
#Override
public String toString() {
return description.toString();
}
}
}
The line on which GeoDataApi.getAutocompletePredictions is called, goes into an internal classes called - Filter.java, Log.java, handler.java and then Looper.java and loops there indefinetly on line 121 of Looper.java (I am sure studio sdk will show the code for Looper.java).
It is not even throwing an error, or going to the next line, it just does not work. Plus, I am not able to see the stack trace of an error.
This is the code snippet which is calling this -
if (mLastLocation != null) {
GooglePlacesAutoCompleteAdapter placesAdapter = new GooglePlacesAutoCompleteAdapter(this, R.layout.item_list, mGoogleApiClient, mLastLocation, null);
autoCompView.setAdapter(placesAdapter);
autoCompView.setOnItemClickListener(this);
}
Can someone please tell me what I am doing wrong here? Please any help will be greatly appreciated. I need to get this working as soon as I could.
PS - I am passing mPlaceFilter as null here.
Enable the Google Places API for Android in developers console
This question already has answers here:
BaseAdapter class wont setAdapter inside Asynctask - Android
(4 answers)
Closed 9 years ago.
I am trying to create my own arrayAdapter so I can place multiple textviews inside of a listview. I have searched everywhere and can not find a way to do it. I am new to this and not so sure how to handle it. So far I have an asynctask that gathers 3 strings in a JSON method. These strings are what I want placed in the textViews but I have no idea how to do so, here is my current code.
class loadComments extends AsyncTask<JSONObject, String, JSONObject> {
private ArrayAdapter<String> mAdapter = null;
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
}
protected JSONObject doInBackground(JSONObject... params) {
JSONObject json2 = CollectComments.collectComments(usernameforcomments, offsetNumber);
return json2;
}
#Override
protected void onPostExecute(JSONObject json2) {
try {
if (json2.getString(KEY_SUCCESS) != null) {
registerErrorMsg.setText("");
String res2 = json2.getString(KEY_SUCCESS);
if(Integer.parseInt(res2) == 1){
JSONArray commentArray = json2.getJSONArray(KEY_COMMENT);
final String comments[] = new String[commentArray.length()];
for ( int i=0; i<commentArray.length(); i++ ) {
comments[i] = commentArray.getString(i);
}
JSONArray numberArray = json2.getJSONArray(KEY_NUMBER);
String numbers[] = new String[numberArray.length()];
for ( int i=0; i<numberArray.length(); i++ ) {
numbers[i] = numberArray.getString(i);
}
JSONArray usernameArray = json2.getJSONArray(KEY_USERNAME);
String usernames[] = new String[usernameArray.length()];
for ( int i=0; i<usernameArray.length(); i++ ) {
usernames[i] = usernameArray.getString(i);
}
ArrayList<String> myList = new ArrayList<String>();
class MyClassAdapter extends ArrayAdapter<String> {
private Context context;
public MyClassAdapter(Context context, int textViewResourceId, ArrayList<String> items) {
super(context, textViewResourceId, items);
this.context = context;
}
public View getView(int position, View convertView) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_item, null);
}
String item = getItem(position);
if (item!= null) {
// My layout has only one TextView
TextView commentView = (TextView) view.findViewById(R.id.listComment);
TextView usernameView = (TextView) view.findViewById(R.id.listPostedBy);
TextView NumberView = (TextView) view.findViewById(R.id.listNumber);
// do whatever you want with your string and long
commentView.setText(comments);
NumberView.setText(numbers);
usernameView.setText(usernames);
}
return view;
}
}
}//end if key is == 1
else{
// Error in registration
registerErrorMsg.setText(json2.getString(KEY_ERROR_MSG));
}//end else
}//end if
} //end try
catch (JSONException e) {
e.printStackTrace();
}//end catch
}
}
new loadComments().execute();
This code does not work but I think I am on the right track.
Let us say, you create a class that hold your information about the comments instead of creating three related Arrays :
class Commentary
{
public String username;
public String comment;
public int commentaryIndex;
}
The BaseAdapter can take a List as a parameter whereas the ArrayAdapter wouldn't.
class MyRealAdapter extends BaseAdapter
{
private List<Commentary> comments;
public MyRealAdapter(List<Commentary> comments )
{
this.comments = comments;
}
#Override
public int getCount() {
return comments.size();
}
#Override
public Object getItem(int index) {
return comments.get(index);
}
#Override
public long getItemId(int index) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Commentary c = (Commentary) getItem(position);
//c.username, c.comment, c.commentaryIndex
// create the view and stuff
return null;
}
}
As you can see, you again have the getView method but now you can retrieve your complete objet and not just a String.
There is a couple more method to override, but as you can see it's very simple.
You might need to pass other argument like a Context or a LayoutInflater to the constructor, but it's not mandatory.
EDIt :
JSONArray commentArray = json2.getJSONArray(KEY_COMMENT);
JSONArray numberArray = json2.getJSONArray(KEY_NUMBER);
JSONArray usernameArray = json2.getJSONArray(KEY_USERNAME);
ArrayList<Commentary> comments = new ArrayList<commentary>();
for ( int i=0; i<commentArray.length(); i++ ) {
Commentary c = new Commentary();
c.username = usernameArray.getString(i);
c.comment = commentArray.getString(i);
c.commentaryIndex = Integer.parseInt(numberArray.getString(i));
comments.add(c);
}
MyRealAdapter adapter = new MyRealAdapter(comments);
Hi I am currently doing my final year project; I need to develop an algorithm visualization tool. I need to cater for user-defined algo; that is animate the algorithm the user types in a text-editor provided in my tool.
I am using the Java Compiler API to compile the code that the user has typed and saved. My tool offers a set of classes that the user can use in his/her algo.
For example:
myArray(this class is provided by my tool)
import java.awt.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.accessibility.AccessibleContext;
import javax.swing.*;
public class myArray extends JComponent {
int size = 0;
int count = 0;
int[]hold;
Thread th;
public myArray(int[]arr)//pass user array as parameter
{
//th = new Thread();
size=arr.length;
hold = arr;//make a copy of the array so as to use later in swap operation
}
public int length()
{
return hold.length;
}
public void setAccessibleContext(AccessibleContext accessibleContext) {
this.accessibleContext = accessibleContext;
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
this.setPreferredSize(new Dimension(360,100));
for(int i=1; i<=size; i++)
{
g2d.drawRect((i*30), 30, 30, 50);
}
for(int i=1; i<=size; i++)
{
g2d.drawString(Integer.toString(hold[i-1]), (i*30)+15, 30+25);
}
}
public void set(int i, int j)//position of the two elements to swap in the array
{
try {
th.sleep(2000);//sleep before swapping because else user won't see original array since it would swap and then sleep
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int temp = hold[i];
hold[i] = hold[j];
hold[j] = temp;
hold[i]=j;
this.repaint();//can use eapint with a class that extends JPanel
}
public void swap(int i, int j)//position of the two elements to swap in the array
{
try {
th.sleep(2000);//sleep before swapping because else user won't see original array since it would swap and then sleep
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int temp = hold[i];
hold[i] = hold[j];
hold[j] = temp;
this.repaint();//can use eapint with a class that extends JPanel
}
public int get(int pos)
{
return hold[pos];
}
}
This is a portion of my GUI that will cause the compilation:
JavaCompiler jc = null;
StandardJavaFileManager sjfm = null;
File javaFile = null;
String[] options = null;
File outputDir = null;
URL[] urls = null;
URLClassLoader ucl = null;
Class clazz = null;
Method method = null;
Object object = null;
try
{
jc = ToolProvider.getSystemJavaCompiler();
sjfm = jc.getStandardFileManager(null, null, null);
File[] files = new File[1];
//files[0] = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project/myArray.java");
//files[1] = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project/Tool.java");
files[0] = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project/userDefined.java");
// getJavaFileObjects’ param is a vararg
Iterable fileObjects = sjfm.getJavaFileObjects(files);
jc.getTask(null, sjfm, null, null, null, fileObjects).call();
// Add more compilation tasks
sjfm.close();
options = new String[]{"-d", "C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project"};
jc.getTask(null, sjfm, null, Arrays.asList(options), null, fileObjects).call();
outputDir = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project");
urls = new URL[]{outputDir.toURL()};
ucl = new URLClassLoader(urls);
clazz = ucl.loadClass("userDefined");
method = clazz.getMethod("user", null);
object = clazz.newInstance();
Object ob = method.invoke(object, null);
}
This is an example of a user-defined algo(userDefined.java):
import java.awt.*;
import javax.swing.*;
public class userDefined
{
public void user()
{
int [] numArr = {1,3,1,-1,5,-5,0,7,12,-36};
myArray myArray = new myArray(numArr);
JFrame frame = new JFrame("Rectangles");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setSize(360, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.add(myArray);
for (int i=myArray.length(); i>1; i--)
{
for (int j=0; j<i-1; j++)
{
if (myArray.get(j) > myArray.get(j+1))
{
myArray.swap(j, j+1);
}
}
}
}
}
The problem I am getting is that if I try to use reflection like above; I only get a white window which does not show the animation) but just displays the result at the very end.
However if I use this instead of reflection(and change the method void user() to static void main(string args) in userDefined.java):
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
if(compiler.run(null, null, null, "userDefined.java") != 0) {
System.err.println("Could not compile.");
System.exit(0);
}
try {
Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("java "+"userDefined");
BufferedReader input = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line=null;
while((line=input.readLine()) != null) {
System.out.println(line);
}
} catch(Exception e) {
System.out.println(e.toString());
e.printStackTrace();
it woks provided that after first compilation I place the myArray class in the same folder as the userDefined.java. In this case I can see the animation take place correctly.
How do I use reflection to invoke the main method instead of using an instance of the class.
Please I really need some help with this. Thanks!
You a violating / missusing the first rule of swing: acces swing components only in the EDT (Event Dispatch Thread).
When you start your program using the main method, you are violating that rule. This happens to work, but might have all kinds of weird effects. This is not a theoretic warning, it happend to me and it is not nice.
When you run it using reflection from your code, you are most likely in the EDT, so your algorithm runs completely before the GUI gets updated again (which also happens on the EDT). Thats why you see only the final result of the algorithm.
The correct way to do this would be:
Run the algorithm in a seperate thread and make sure all changes to your myArray Component happen in the EDT, using SwingUtilities.invokeAndWait or SwingUtilities.invokeLater