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Main Activity Using onStart, onStop, onResume Not Showing the Appropriate XML/Interface

I'm following a guide on coding by Easy Tuto, currently on part 7 at the end where the recycler_note_item.xml would show up on the interface. In the video, he fixed the problem by adding the onStart, onStop, onResume commands and adding `noteAdapter.startListening' in between the lines as shown here: image In the video, it worked and showed the item however nothing showed up for me as can be seen here . I tried scouring the video trying to find what I did wrong. I'm pretty new to coding and I was using his video as a base to learn more about it. I added those lines myself but it diddn't work for me it seems. Can someone please help me? It would be greatly appreciated. Here is my code for MainActivity.Java:
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageButton;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.firebase.firestore.Query;
public class MainActivity extends AppCompatActivity {
FloatingActionButton addNoteBtn;
RecyclerView recyclerView;
ImageButton menuBtn;
NoteAdapter noteAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addNoteBtn = findViewById(R.id.add_note_btn);
recyclerView = findViewById(R.id.recyler_view);
menuBtn = findViewById(R.id.menu_btn);
addNoteBtn.setOnClickListener((v)-> startActivity(new Intent(MainActivity.this,NoteDetailsActivity.class)) );
menuBtn.setOnClickListener((v)->showMenu());
setupRecyclerView();
}
void showMenu(){
//TODO Display menu
}
void setupRecyclerView(){
Query query = Utility.getCollectionReferenceForNotes().orderBy("timestamp",Query.Direction.DESCENDING);
FirestoreRecyclerOptions<Note> options = new FirestoreRecyclerOptions.Builder<Note>()
.setQuery(query,Note.class).build();
recyclerView.setLayoutManager(new LinearLayoutManager(this));
noteAdapter = new NoteAdapter(options,this);
recyclerView.setAdapter(noteAdapter);
}
#Override
protected void onStart() {
super.onStart();
noteAdapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
noteAdapter.stopListening();
}
#Override
protected void onResume() {
super.onResume();
noteAdapter.notifyDataSetChanged();
}
}
I think the other relevant codes is my NoteAdapter which is this:
package com.example.myapplication;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import io.grpc.okhttp.internal.Util;
public class NoteAdapter extends FirestoreRecyclerAdapter<Note, NoteAdapter.NoteViewHolder>{
Context context;
public NoteAdapter(#NonNull FirestoreRecyclerOptions<Note> options, Context context) {
super(options);
this.context = context;
}
#Override
protected void onBindViewHolder(#NonNull NoteViewHolder holder, int position, #NonNull Note note) {
holder.titleTextView.setText(note.title);
holder.contentTextView.setText(note.content);
holder.timestampTextView.setText(Utility.timestamptoString(note.timeStamp));
}
#NonNull
#Override
public NoteViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_note_item,parent,true);
return new NoteViewHolder(view);
}
class NoteViewHolder extends RecyclerView.ViewHolder{
TextView titleTextView,contentTextView,timestampTextView;
public NoteViewHolder(#NonNull View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.note_title_text_view);
contentTextView = itemView.findViewById(R.id.note_content_text_view);
timestampTextView = itemView.findViewById(R.id.note_timestamp_text_view);
}
}
}
Please tell me if there are any other relevant codes I can give to help give more context on my problem. Thanks for helping me out if anyone!

Creating a simple search functionality

I was trying to understand how to make a search functions in an app. I go through the Creating a Search Interface documentation, but its quite hard and yea i need help. However, i do succeed to just create a search interface, displaying results based from a string arrray. It does work, but it doesnt had any activity behind it or any intent. It more like a simple text-search. I just wondering can i put int that can simultaneously work with string ?
Or any solution and ideas, really appreciate it.
for now here is my homefragment class
package com.example.testtt;
import androidx.cardview.widget.CardView;
import androidx.fragment.app.Fragment;;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SearchView;
import androidx.annotation.Nullable;
import java.util.ArrayList;
public class HomeFragment extends Fragment implements View.OnClickListener {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_home, container, false);
//define
RelativeLayout drawerlayouthome;
ListView list;
ListViewAdapter adapter;
SearchView editsearch;
ArrayList<DoaSearchIndex> arrayList = new ArrayList<DoaSearchIndex>();
String[] doasearchindex = getActivity().getResources().getStringArray(R.array.doasearchindex);
//locatelistview
list = v.findViewById(R.id.searchlistview);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
list.setVisibility(View.INVISIBLE);
}
});
for (int i = 0; i < doasearchindex.length; i++) {
DoaSearchIndex doaSearchIndex = new DoaSearchIndex(doasearchindex[i]);
arrayList.add(doaSearchIndex);
}
//pass result to listviewadapter.class
adapter = new ListViewAdapter(this.getActivity(), arrayList);
//binds adapter to listview
list.setAdapter(adapter);
list.setVisibility(View.INVISIBLE);
//locatesearchview
editsearch = v.findViewById(R.id.searchview);
editsearch.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
if(TextUtils.isEmpty(newText)){
list.clearTextFilter();
adapter.filter("");
list.setVisibility(View.INVISIBLE);
} else {
adapter.filter(newText);
list.setVisibility(View.VISIBLE);
}
return true;
}
});
drawerlayouthome = v.findViewById(R.id.drawer_layouthome);
drawerlayouthome.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
list.setVisibility(View.INVISIBLE);
editsearch.clearFocus();
}
});
//definingcardview
CardView doacard = v.findViewById(R.id.doacard);
CardView ziarahcard = v.findViewById(R.id.ziarahcard);
//setcardviewlistener
doacard.setOnClickListener(this);
ziarahcard.setOnClickListener(this);
return v;
}
#Override
public void onClick(View view) {
Intent i ;
switch (view.getId()) {
case R.id.doacard:
i = new Intent(getActivity(), listdoa.class);
startActivity(i);
break;
case R.id.ziarahcard:
i = new Intent(getActivity(), listziarah.class);
startActivity(i);
break;
}
}
}
and my listviewadapter
package com.example.testtt;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class ListViewAdapter extends BaseAdapter {
//Declare variables first
Context mContext;
LayoutInflater inflater;
private List<DoaSearchIndex> doaSearchIndexList = null;
private ArrayList<DoaSearchIndex> arrayList;
public ListViewAdapter(Context context, List<DoaSearchIndex> doaSearchIndexList) {
mContext = context;
this.doaSearchIndexList = doaSearchIndexList;
inflater = LayoutInflater.from(mContext);
this.arrayList = new ArrayList<DoaSearchIndex>();
this.arrayList.addAll(doaSearchIndexList);
}
public class ViewHolder {
TextView name;
}
#Override
public int getCount() {
return doaSearchIndexList.size();
}
#Override
public DoaSearchIndex getItem(int position) {
return doaSearchIndexList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.listview_item, null);
// Locate the TextViews in listview_item.xml
holder.name = (TextView) view.findViewById(R.id.name);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
// Set the results into TextViews
holder.name.setText(doaSearchIndexList.get(position).getDoaSearchIndex());
return view;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
doaSearchIndexList.clear();
if (charText.length() == 0) {
doaSearchIndexList.addAll(arrayList);
} else {
for (DoaSearchIndex wp : arrayList) {
if (wp.getDoaSearchIndex().toLowerCase(Locale.getDefault()).contains(charText)) {
doaSearchIndexList.add(wp);
}
}
}
notifyDataSetChanged();
}
}
and my doasearchindex class
package com.example.testtt;
public class DoaSearchIndex {
private String doaSearchIndex;
public DoaSearchIndex(String doaSearchIndex) {
this.doaSearchIndex = doaSearchIndex;
}
public String getDoaSearchIndex() {
return this.doaSearchIndex;
}
}

How can I display a PDF file in a WebView (JavaFX) panel using PDF.js?

I got this (https://stackoverflow.com/a/42040344/3789572) solution, which code is below, but it isn't working. When I press the button, nothing is shown.
You can change the file paths and try it for yourself.
Can you help me?
Controller code:
package sample.principal;
import javafx.concurrent.Worker;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import netscape.javascript.JSObject;
import java.io.File;
import java.net.URL;
import java.util.Base64;
import java.util.ResourceBundle;
import org.apache.commons.io.FileUtils;
public class WebController implements Initializable {
#FXML
private WebView web;
#FXML
private Button btn;
public void initialize(URL location, ResourceBundle resources) {
WebEngine engine = web.getEngine();
String url = getClass().getResource("..\\resources\\web\\viewer.html").toExternalForm();
// connect CSS styles to customize pdf.js appearance
engine.setUserStyleSheetLocation(getClass().getResource("..\\resources\\web\\viewer.css").toExternalForm());
engine.setJavaScriptEnabled(true);
engine.load(url);
engine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> {
// to debug JS code by showing console.log() calls in IDE console
JSObject window = (JSObject) engine.executeScript("window");
window.setMember("java", new JSLogListener());
engine.executeScript("console.log = function(message){ java.log(message); };");
// this pdf file will be opened on application startup
if (newValue == Worker.State.SUCCEEDED) {
try {
// readFileToByteArray() comes from commons-io library
byte[] data = FileUtils.readFileToByteArray(new File("C:\\Users\\Felipe\\Documents\\" +
"Programação\\Java\\" +
"IdeaProjects\\PDFviewerStackOverFlow\\src\\sample\\principal\\teste.pdf"));
String base64 = Base64.getEncoder().encodeToString(data);
// call JS function from Java code
engine.executeScript("openFileFromBase64('" + base64 + "')");
} catch (Exception e) {
e.printStackTrace();
}
}
});
// this file will be opened on button click
btn.setOnAction(actionEvent -> {
try {
byte[] data = FileUtils.readFileToByteArray(new File("teste.pdf"));
String base64 = Base64.getEncoder().encodeToString(data);
engine.executeScript("openFileFromBase64('" + base64 + "')");
} catch (Exception e) {
e.printStackTrace();
}
});
}
}
The Main code:
package sample.principal;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
public static void main(String[] args) {
Application.launch();
}
public void start(Stage primaryStage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("PDF test app");
primaryStage.setScene(new Scene(root, 1280, 576));
primaryStage.show();
}
}
and the other one:
package sample.principal;
public class JSLogListener {
public void log(String text) {
System.out.println(text);
}
}
I would be very grateful for your help.
Thanks.

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.VBox;
import javafx.scene.web.WebEngine;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage stage) {
stage.setTitle("HTML");
stage.setWidth(500);
stage.setHeight(500);
Scene scene = new Scene(new Group());
VBox root = new VBox();
final WebView browser = new WebView();
final WebEngine webEngine = browser.getEngine();
ScrollPane scrollPane = new ScrollPane();
scrollPane.setContent(browser);
webEngine.loadContent("<b>asdf</b>");
root.getChildren().addAll(scrollPane);
scene.setRoot(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}

React Native app first shows white screen, then goes to app

I am running React Native 0.56. When I start my app, it first shows a white screen for 1 second then goes to the app. My files are:
public class MainApplication extends Application implements ReactApplication {
private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
#Override
public boolean getUseDeveloperSupport() {
return BuildConfig.DEBUG;
}
#Override
protected List<ReactPackage> getPackages() {
return Arrays.<ReactPackage>asList(
new MainReactPackage(),
new BlurViewPackage(),
new OrientationPackage(),
new ReactVideoPackage(),
new RNDeviceInfo(),
new LinearGradientPackage()
);
}
#Override
protected String getJSMainModuleName() {
return "index";
}
};
#Override
public ReactNativeHost getReactNativeHost() {
return mReactNativeHost;
}
#Override
public void onCreate() {
super.onCreate();
SoLoader.init(this, /* native exopackage */ false);
}
}
and
public class MainActivity extends ReactActivity {
/**
* Returns the name of the main component registered from JavaScript.
* This is used to schedule rendering of the component.
*/
#Override
protected String getMainComponentName() {
return "CONtv";
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Intent intent = new Intent("onConfigurationChanged");
intent.putExtra("newConfig", newConfig);
this.sendBroadcast(intent);
}
}
and index.js
import {AppRegistry} from 'react-native';
import App from './src/App';
import {name as appName} from './app.json';
AppRegistry.registerComponent(appName, () => App);
How do I make the white screen not appear? This is happening on Android.

As a solution for the white screen add a splash screen.
Check with this https://android.jlelse.eu/the-complete-android-splash-screen-guide-c7db82bce565

Vaadin (self contained) portlet (Liferay) with Javascript (d3js)

I'm currently developing a portlet, where I want to utilize vaadin with a self defined javascript component. In order to get an idea, how it works, I tried to code the following simple example http://www.rapidpm.org/2013/10/13/using-javascript-libraries-%28d3%29-in-vaa.html.
However, when I integrate my portlet onto liferay I get the following error:
Tue Dec 09 19:02:34 GMT+100 2014 com.vaadin.client.VConsole SEVERE: Could not determine ApplicationConnection for Overlay. Overlay will be attached directly to the root panel
http://localhost:8080/web/guest/testLine 0.
(source firebug)
Failed to load the widgetset:/asdg-0.0.1-SNAPSHOT/VAADIN/widgetsets/testd3.d3.AppWidgetSet/testd3.d3.AppWidgetSet.nocache.js?1418149425812
(chrome dev tool)
My code:
Diagram connector JS
window.testd323_asdg_Diagram = function() {
var diagramElement = this.getElement();
var diagramFrame = d3.select(diagramElement).append("svg:svg").attr("width", 500).attr("height", 500);
diagramFrame.append("svg:circle").attr("cx", 250).attr("cy", 250).attr("r", 20).attr("fill", "red");
this.onStateChange = function() {
var coords = this.getState().coords;
d3.selectAll("circle").transition().attr("cx", parseInt(coords[0]));
d3.selectAll("circle").transition().delay(500).attr("cy", parseInt(coords[1]));
}
}
Diagram.java
package testd323.asdg;
import java.util.List;
import com.vaadin.annotations.JavaScript;
import com.vaadin.ui.AbstractJavaScriptComponent;
#JavaScript({"d3.v3.min.js",
"diagram_connector.js"})
public class Diagram extends AbstractJavaScriptComponent {
public void setCoords(final List<Integer> coords) {
getState().setCoords(coords);
}
#Override
public DiagramState getState() {
return (DiagramState) super.getState();
}
}
DiagramState.java
package testd323.asdg;
import java.util.List;
import com.vaadin.shared.ui.JavaScriptComponentState;
public class DiagramState extends JavaScriptComponentState {
private List<Integer> coords;
public List<Integer> getCoords() {
return coords;
}
public void setCoords(final List<Integer> coords) {
this.coords = coords;
}
}
MyPortletUI.java
package testd323.asdg;
import java.util.ArrayList;
import java.util.List;
import javax.portlet.PortletContext;
import javax.portlet.PortletSession;
import com.liferay.portal.kernel.exception.SystemException;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.service.UserLocalServiceUtil;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.Widgetset;
import com.vaadin.data.validator.IntegerRangeValidator;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.WrappedPortletSession;
import com.vaadin.shared.ui.label.ContentMode;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
#Theme("mytheme")
#SuppressWarnings("serial")
#Widgetset("testd3.d3.AppWidgetSet")
public class MyPortletUI extends UI {
final VerticalLayout layout = new VerticalLayout();
final TextField xCoordField = new TextField("X");
final TextField yCoordField = new TextField("Y");
final Button button = new Button("move circle");
final Diagram diagram = new Diagram();
final List<Integer> coords = new ArrayList<Integer>();
#Override
protected void init(VaadinRequest request) {
configureIntegerField(xCoordField); //not interesting, just adding converter/validator to the textFields
configureIntegerField(yCoordField);
button.addClickListener(new Button.ClickListener() { //ATTENTION! Here we get the coordinates from the textfields and apply them to our Diagram via calling diagram.setCoords()
#Override
public void buttonClick(Button.ClickEvent event) {
if(xCoordField.isValid() && yCoordField.isValid()){
coords.clear();
coords.add(Integer.parseInt(xCoordField.getValue()));
coords.add(Integer.parseInt(yCoordField.getValue()));
diagram.setCoords(coords);
}
}
});
//now we build the layout.
layout.setSpacing(true);
layout.addComponent(xCoordField);
layout.addComponent(yCoordField);
layout.addComponent(button);
layout.addComponent(diagram); //add the diagram like any other vaadin component, cool!
setContent(layout);
}
private void configureIntegerField(final TextField integerField) {
integerField.setConverter(Integer.class);
integerField.addValidator(new IntegerRangeValidator("only integer, 0-500", 0,500));
integerField.setRequired(true);
integerField.setImmediate(true);
}
}
My setup is:
Maven 7.2.6 Vaadin-liferay-portlet Archertype
Liferay 6.2.1
d3.v3.min.js
Eclipse
I would be thrilled if someone could explain to me what I'm doing wrong. I don't have so much experience with the self contained approach and have some difficulties with it.
Thank you very much.

I have solved my issue a couple of weeks ago and I post my solution if someone has a similar problem.
In the main UI class you have to add an Anootation referring to your used Javascript libraries. For example in my case, I had to add my MyPorletUI.java:
#Theme("mytheme")
#SuppressWarnings("serial")
#Widgetset("CircleD3.circle.AppWidgetSet")
#com.vaadin.annotations.JavaScript( {"d3.v3.min.js",
"CircleD3_circle_Diagram.js"} )
public class MyPortletUI extends UI { (...)
Everything else works as described in the tutorial link, I was referring in my original question post.