Here is my code
Main .java file :
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
ListView lv;
ArrayAdapter<String> adapter;
ArrayList<String> arr;
JSONObject object=new JSONObject();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView)findViewById(R.id.lv1);
arr = new ArrayList<>();
arr.add("Dedicated To.. ");
arr.add("1. A cheerful heart");
arr.add("2. A new commandment");
arr.add("3. A pure heart");
try {
object.put("1. A cheerful heart"," you ");
object.put("2. A new commandment","Welcome");
object.put("2. A new commandment","Welcome");
object.put("3. A pure heart","Heis");
} catch (JSONException e) {
e.printStackTrace();
}
final JSONArray keys=object.names();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i=new Intent(MainActivity.this,Main2Activity.class);
try {
i.putExtra("text",object.getString(keys.getString(position)));
} catch (JSONException e) {
e.printStackTrace();
}
startActivity(i);
}
});
There some other code to too.
My Doubt is,
Here if you see arr.add("1. A cheerful heart"); is the one which I am passing to object.put("1. A cheerful heart"," you ");.
When I click on Cheerful heart item it should show you on its respectively but it is taking a random value which like object.put("3. A pure heart","Heis"); i.e; value is passing randomly. IF there are 100 it is taking random values.
So I need help to give positioning When I click on item1 it has to give item1 content in next activity. When I click item2 it should give me Item2 content respectively.
Please, someone, help me how to give positioning when I passing JSON array to JSON object. Also If any help me with Search view integrated into my question well appreciated.
IF loop or for loop is fine, I want I give full code.
Related
Right now, I am in the process of "optimizing" my app. I am still a beginner, so what I am doing is basically moving methods from my MainActivity.class to their separate class. I believe it's called Encapsulation (Please correct me if I'm wrong).
My application needs to :
Get a YouTube Playlist Link from the YouTube App (with an Intent, android.intent.action.SEND).
Use the link to fetch data from the Google Servers with the YouTubeApi and Volley.
Read the data received and add it to an arrayList<String>.
What my YouTubeUsage.java class is supposed to do, is fetch data with the YouTubeApi and Volley then store the data using SharedPreferences. Once the data is saved, the data is being read in my ConvertActivity.class (It's an activity specifically created for android.intent.action.SEND) with my method getVideoIds() before setting an adapter for my listView in my createRecyclerView() method.
YouTubeUsage.java
public class YoutubeUsage {
private Boolean results = false;
private String mResponse;
private ArrayList<String> videoIds = new ArrayList<>();
String Url;
public String getUrl(String signal) {
String playlistId = signal.substring(signal.indexOf("=") + 1);
this.Url = "https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails%2C%20snippet%2C%20id&playlistId=" +
playlistId + "&maxResults=25&key=" + "API_KEY";
return this.Url;
}
public void fetch(String Url, final Context context){
RequestQueue queue = Volley.newRequestQueue(context);
StringRequest request = new StringRequest(Request.Method.GET, Url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
sharedPreferences(response, context);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("VolleyError", Objects.requireNonNull(error.getMessage()));
}
});
queue.add(request);
}
private void sharedPreferences(String response, Context context){
SharedPreferences m = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = m.edit();
if (m.contains("serverResponse")){
if (!m.getString("serverResponse", "").equals(response)){
editor.remove("serverResponse");
editor.apply();
updateSharedPreferences(response, context);
}
} else{
updateSharedPreferences(response, context);
}
}
private void updateSharedPreferences(String mResponse, Context mContext){
SharedPreferences m = PreferenceManager.getDefaultSharedPreferences(mContext);
SharedPreferences.Editor editor = m.edit();
editor.putString("serverResponse", mResponse);
editor.apply();
}
}
ConvertActivity.java
public class ConvertActivity extends AppCompatActivity {
YoutubeUsage youtubeUsage = new YoutubeUsage();
ArrayList<String> videoIDs = new ArrayList<>();
String Url = "";
ListView listView;
MyCustomAdapter myCustomAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_convert);
listView = findViewById(R.id.listview_convert);
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
if ("android.intent.action.SEND".equals(action) && "text/plain".equals(type)) {
Url = youtubeUsage.getUrl(Objects.requireNonNull(intent.getStringExtra("android.intent.extra.TEXT")));
}
//I would like to avoid the try/catch below
try {
videoIDs = getVideoIDs(Url, this);
createRecyclerView(videoIDs);
Log.i("ResponseVideoIDs", String.valueOf(videoIDs.size()));
} catch (JSONException e) {
e.printStackTrace();
}
}
private ArrayList<String> getVideoIDs(String Url, Context context) throws JSONException {
ArrayList<String> rawVideoIDs = new ArrayList<>();
youtubeUsage.fetch(Url, context);
SharedPreferences m = PreferenceManager.getDefaultSharedPreferences(context);
String serverResponse = m.getString("serverResponse", "");
JSONObject jsonObject = new JSONObject(serverResponse);
JSONArray jsonArray = jsonObject.getJSONArray("items");
for (int i = 0; i<jsonArray.length(); i++){
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
JSONObject jsonVideoId = jsonObject1.getJSONObject("contentDetails");
rawVideoIDs.add(jsonVideoId.getString("videoId"));
}
return rawVideoIDs;
}
private void createRecyclerView(ArrayList<String> videoIDs){
myCustomAdapter = new MyCustomAdapter(this, videoIDs);
listView.setAdapter(myCustomAdapter);
myCustomAdapter.notifyDataSetChanged();
}
}
Everything works fine, however, my sharedPreferences never gets updated. Which means, if I share a YouTube playlist from the YouTube App to my app with 3 items in it, it will work fine. The Listview will show 3 items with their corresponding IDs as it should. But, if I share a YouTube playlist again, my app will still hold on to the data of the previous playlist I shared (even if I close it), showing the item number and the IDs of the previous link. If i continue to share the same playlist over and over, it will eventually show the correct number of items and the correct IDs.
I could totally put all my methods from the YouTubeUsage.java in my ConvertActivity.class preventing me from using SharedPreferences to transfer data between the two java classes. However, JSON throws an exception. That means I have to encapsulate my code with try/catch. I would like to avoid those since I need to do a lot of operations on the data just received by Volley (check a class size, look for certains strings). I find that doing this in these try/catch don't work like I want. (i.e. outside the try/catch, the values remains the same even if I updated them in the try/catch).
I want to know two things.
How can I correct this problem?
Is this the most efficient way to do this (optimization)? (I though of maybe
converting the VolleyResponse to a string with Gson then store the String file, but I don't know if that's the best way to do it since it's supposed to be
provisional data. It feels like just more of the same).
Thank You!
There is an issue with making assumptions about order of events. Volley will handle requests asynchronously, so it is advisable to implement the observer pattern here.
Create a new Java file that just contains:
interface MyNetworkResponse {
void goodResponse(String responseString);
}
Then make sure ConvertActivity implements MyNetworkResponse and create method:
void goodResponse(String responseString) {
// handle a positive response here, i.e. extract the JSON and send to your RecyclerView.
}
within your Activity.
In your YoutubeUsage constructor, pass in the Activity context (YoutubeUsage) and then store this in a YoutubeUsage instance variable called ctx.
In onCreate, create an instance of YoutubeUsage and pass in this.
In onResponse just call ctx.goodResponse(response).
Amend the following block to:
if ("android.intent.action.SEND".equals(action) && "text/plain".equals(type)) {
Url = youtubeUsage.getUrl(Objects.requireNonNull(intent.getStringExtra("android.intent.extra.TEXT")));
youtubeUsage.fetch(Url);
}
Delete the try/catch from onCreate.
And no need to use SharedPreferences at all.
UPDATE
Try this code:
MyNetworkResponse.java
interface MyNetworkResponse {
void goodResponse(String responseString);
void badResponse(VolleyError error);
}
YoutubeUsage.java
class YoutubeUsage {
private RequestQueue queue;
private MyNetworkResponse callback;
YoutubeUsage(Object caller) {
this.callback = (MyNetworkResponse) caller;
queue = Volley.newRequestQueue((Context) caller);
}
static String getUrl(String signal) {
String playlistId = signal.substring(signal.indexOf("=") + 1);
return "https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails%2C%20snippet%2C%20id&playlistId=" + playlistId + "&maxResults=25&key=" + "API_KEY";
}
void fetch(String url){
StringRequest request = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
callback.goodResponse(response);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
callback.badResponse(error);
}
});
queue.add(request);
}
}
ConvertActivity.java
public class ConvertActivity extends AppCompatActivity implements MyNetworkResponse {
YoutubeUsage youtubeUsage;
ArrayList<String> videoIDs = new ArrayList<>();
ListView listView;
MyCustomAdapter myCustomAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_convert);
listView = findViewById(R.id.listview_convert);
youtubeUsage = new YoutubeUsage(this);
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
if ("android.intent.action.SEND".equals(action) && "text/plain".equals(type)) {
String url = YoutubeUsage.getUrl(Objects.requireNonNull(intent.getStringExtra("android.intent.extra.TEXT")));
youtubeUsage.fetch(url);
}
}
private ArrayList<String> getVideoIDs(String serverResponse) throws JSONException {
ArrayList<String> rawVideoIDs = new ArrayList<>();
JSONObject jsonObject = new JSONObject(serverResponse);
JSONArray jsonArray = jsonObject.getJSONArray("items");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
JSONObject jsonVideoId = jsonObject1.getJSONObject("contentDetails");
rawVideoIDs.add(jsonVideoId.getString("videoId"));
}
return rawVideoIDs;
}
private void createRecyclerView(ArrayList<String> videoIDs) {
myCustomAdapter = new MyCustomAdapter(this, videoIDs);
listView.setAdapter(myCustomAdapter);
myCustomAdapter.notifyDataSetChanged();
}
#Override
public void goodResponse(String responseString) {
Log.d("Convert:goodResp", "[" + responseString + "]");
try {
ArrayList<String> rawVideoIDs = getVideoIDs(responseString);
createRecyclerView(rawVideoIDs);
} catch (JSONException e) {
// handle JSONException, e.g. malformed response from server.
}
}
#Override
public void badResponse(VolleyError error) {
// handle unwanted server response.
}
}
I have been working on an app that requires me to get information such as a Place Name and a PLace Photo from google PLaces Api and set it into a RecyclerView. I am stuck because I managed to get the code to work with no errors but the RecyclerView is empty. What is wrong with my code?
I am stuck because I don't know where the problem is. When I run the code, all the fetchs work and the tags show up in the Log so I am completely lost. My first thought is that I am displaying the code wrong but then I have no recourse to step forward and change it to something else because I am not sure if it would be better or worse.
This is the Fragment for the RecyclerView Item:
public class VenueList extends Fragment{
ArrayList<VenueItem> vIL = new ArrayList<>();
private PlacesClient placesClient;
private Context contextForPlaces;
place ids for the places I am currently using
String[] clubs = {"ChIJO_uSYKNZwokRAC7RLeB0oZ8", "ChIJAQBEylJYwokRLbnrAchQImk",
"ChIJU_26rfpYwokRTNf2K1-7p8E", "ChIJ38hxfnhZwokRx1HSFLj790w", "ChIJBwnlGrdZwokRpf61pMm860c"
, "ChIJpSIzqrhZwokR1KnVMoVty_g", "ChIJMRV7375ZwokRAfltF6Y-wYw", "ChIJYabdHPhYwokRPmAV8GtM3gs",
"ChIJi2dSjQRZwokRuXUKcv4riVc", "ChIJKaKVI79ZwokRN8WicODOIAw", "ChIJwXI8Fb5ZwokRr4JjG4HxSP8",
"ChIJ6bU_E4ZZwokR2ZDbY_IhhrI"};
#Override
public void onAttach(Context context) {
super.onAttach(context);
contextForPlaces = context;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.menu_venue, container, false);
RecyclerView vRV = view.findViewById(R.id.view_venue);
List<Place.Field> placeFields = Arrays.asList(Place.Field.NAME, Place.Field.PHOTO_METADATAS);
if (!Places.isInitialized()) {
Places.initialize(contextForPlaces, "AIzaSyCKGd3fqmtsDklRGMhnkuIy1GS-j6gRBh8");}
placesClient = Places.createClient(contextForPlaces);
vRV.setHasFixedSize(true);
RecyclerView.LayoutManager vLM = new LinearLayoutManager(this.getActivity());
RecyclerView.Adapter vAdapter = new VenueAdapter(vIL);
// run through each photo to make sure it has a place attached to it then insert each photo and place into the vIL
//createBitmap for fetchPhoto
for (String club : clubs) {
FetchPlaceRequest request = FetchPlaceRequest.newInstance(club, placeFields);
placesClient.fetchPlace(request).addOnSuccessListener((response) -> {
Place place = response.getPlace();
PhotoMetadata photoMetadata = place.getPhotoMetadatas().get(0);
String attributions = photoMetadata.getAttributions();
FetchPhotoRequest photoRequest = FetchPhotoRequest.builder(photoMetadata).setMaxHeight(200).build();
placesClient.fetchPhoto(photoRequest).addOnSuccessListener((fetchPhotoResponse) -> {
Bitmap bitmap = fetchPhotoResponse.getBitmap();
vIL.add(new VenueItem(/*Photo*/bitmap, place/*Name*/));
Log.i(TAG, "Photo Should Be Up: ");
}).addOnFailureListener((exception) -> {
if (exception instanceof ApiException) {
ApiException apiException = (ApiException) exception;
int statusCode = apiException.getStatusCode();
// Handle error with given status code.
Log.e(TAG, "Place not found: " + exception.getMessage());
}
});
Log.i(TAG, "Place found: " + place.getName());
}).addOnFailureListener((exception) -> {
if (exception instanceof ApiException) {
ApiException apiException = (ApiException) exception;
int statusCode = apiException.getStatusCode();
// Handle error with given status code.
Log.e(TAG, "Place not found: " + exception.getMessage());
}
});
}
vRV.setLayoutManager(vLM);
vRV.setAdapter(vAdapter);
return view;
}
This is the part of the RecyclerView Adapter I changed. I used to be a getResourse for the image because the image was from the drawable folder
public void onBindViewHolder(#NonNull VenueViewHolder venueViewHolder, int i) {
VenueItem currentItem = vIAL.get(i);
if(currentItem.getVenueImageResource() == null){
venueViewHolder.vIV.setImageResource(R.drawable.ic_android);
}else
venueViewHolder.vIV.setImageBitmap(currentItem.getVenueImageResource());
venueViewHolder.vTV.setText((CharSequence) currentItem.getVenueDescription());
}
The Item itself which I also had to change a bit from its original. I made the string a Place and the int a Bitmap. I thought that would work.
public class VenueItem {
private Bitmap venueImageResource;
private Place venueDescription;
public VenueItem(Bitmap vIR, Place description) {
venueImageResource = vIR;
venueDescription = description;
}
public Bitmap getVenueImageResource() {
return venueImageResource;
}
public Place getVenueDescription() {
return venueDescription;
}
}
I want to be able to request a place name and a photo of the place using the placesClient and precent it in the for of a RecyclerView. I know the place Ids are correct because the Log returns the names of all the places. But they do not show up on the RecyclerView
I figured out the answer myself.
vRV.setLayoutManager(vLM);
vRV.setAdapter(vAdapter);
I just had to put these two lines into the for loop under the list item so that each item could escape before meing erased
I want to bind MyImpl to Multibinding. But MyImpl's constructor takes parameter.
final Multibinder<MyInterface> binder = Multibinder.newSetBinder(binder(), MyInterface.class)
binder.addBinding().to(MyImpl.class);
public MyImpl(Boolean myParam) ...
I do not want to #Inject it because it's say boolean, which can be occasionally injected somewhere else. So. I can introduce some Enum and inject it instead, how then to do this? Or can I better just write somehow
binder.addBinding().to(MyImpl.class, true);
binder.addBinding().to(MyImpl2.class, false);
or so?
I do not want to #Inject it because it's say boolean, which can be occasionally injected somewhere else.
To avoid this, use Named Annotations.
Solution One:
#Inject
public TextEditor(#Named("OpenOffice") SpellChecker spellChecker) { ...}
Here is the binding code:
bind(SpellChecker.class).annotatedWith(Names.named("OpenOffice")).to(OpenOfficeWordSpellCheckerImpl.class);
Solution Two:
Load java-properties in a module and use the java-prop-names:
private static Properties loadProperties(String name){
Properties properties = new Properties();
ClassLoader loader = Thread.currentThread().getContextClassLoader();
InputStream is = loader.getResourceAsStream(name);
try {
properties.load(is);
} catch (IOException e) {
throw new RuntimeException(e);
}finally {
if(is != null){
try {
is.close();
} catch (IOException dontCare) { }
}
}
return properties;
}
protected void configure() {
try{
Properties gameProperties = loadProperties("game.properties");
Names.bindProperties(binder(),gameProperties);
}catch (RuntimeException ex){
addError("Could not configure Game Properties");
};
}
since i am not a java swing expert i need some help to understand why my images in my JList do not appear.
I have a JList that pops up containing all products (with inline pictures) while the user enters a search criteria. The results come from lucene and will be rendered in a JList in real time.
To lazy load the inline product images i am using a swingworker inside my rendering class.
Any help would be great!
public abstract class MatchRenderer implements ListCellRenderer {
#Override
public Component getListCellRendererComponent(JList list, final Object value, int index,
boolean isSelected, boolean cellHasFocus) {
Component component = defaultRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (quickRenderMode) {
return component;
} else {
try {
component = renderHook(value, component);
} catch (Exception e) {
System.err.println("Search string: " + searchString);
System.err.println(value.toString());
e.printStackTrace();
}
JPanel itemPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
JLabel label = new JLabel(defaultIcon, SwingConstants.HORIZONTAL);
itemPanel.add(label);
itemPanel.add(component);
if (value instanceof QoogleEntity && ((QoogleEntity) value).isProduct()) {
QoogleEntity qoogleItem = (QoogleEntity) value;
String imageUrl = qoogleItem.getQInfos().get(0).getqValue();
//LAZY LOAD STARTS HERE...
new ImageRetriever(label, imageUrl).execute();
}
return itemPanel;
}
}
protected abstract Component renderHook(Object value, Component component);
class ImageRetriever extends SwingWorker<ImageIcon, String> {
private JLabel lbImage;
private String imageUrl;
public ImageRetriever(JLabel lbImage, String imageUrl) {
this.lbImage = lbImage;
this.imageUrl = imageUrl;
}
#Override
protected void done() {
try {
lbImage.setIcon(get());
lbImage.repaint();
} catch (Exception e) {
}
}
#Override
protected ImageIcon doInBackground() throws Exception {
return ImageLoader.loadImageFromUrl(imageUrl, 80, 80);
}
};
so I've been looking for this for a week now and reading though every problem similar but none seemed to ask the same problem as mine exactly(try reverse engineering other solution similar to what I want with no success.
explained caveman style: I'm trying to create list using Metadata.
I open with a multi dialog and select more than one mp3
I put the file in an ArrayList<File>
I loop though the files with an enhanced for loop and extract metadata using a media variable
The info for the metadata ( like "artist") is what i want to save in an ArrayList for example
the problem is that the listener only works way after the enhanced loop has finished which results in
ArrayList<String> having one object with nothing in it
here is a sample:
ArrayList<String> al;
String path;
public void open(){
files=chooser.showOpenMultipleDialog(new Stage());
for( File f:files){
path=f.getPath();
Media media = new Media("file:/"+path.replace("\\", "/").replace(" ", "%20"));
al= new ArrayList<String>();
media.getMetadata().addListener(new MapChangeListener<String, Object>() {
public void onChanged(Change<? extends String, ? extends Object> change) {
if (change.wasAdded()) {
if (change.getKey().equals("artist")) {
al.add((String) change.getValueAdded());
}
}
}
});
}//close for loop
//then i want to see the size of al like this
system.out.println(al.size());
//then it returns 1 no matter how much file i selected
//when i system out "al" i get an empty string
the other way to read a media source metadata with adding a listener is extract that information in the mediaplayer .setOnReady(); here is an example part of the java controller class
public class uiController implements Initializable {
#FXML private Label label;
#FXML private ListView<String> lv;
#FXML private AnchorPane root;
#FXML private Button button;
private ObservableList<String> ol= FXCollections.observableArrayList();
private List<File> selectedFiles;
private final Object obj= new Object();
#Override
public void initialize(URL url, ResourceBundle rb) {
assert button != null : "fx:id=\"button\" was not injected: check your FXML file 'ui.fxml'.";
assert label != null : "fx:id=\"label\" was not injected: check your FXML file 'ui.fxml'.";
assert lv != null : "fx:id=\"lv\" was not injected: check your FXML file 'ui.fxml'.";
assert root != null : "fx:id=\"root\" was not injected: check your FXML file 'ui.fxml'.";
// initialize your logic here: all #FXML variables will have been injected
lv.setItems(ol);
}
#FXML private void open(ActionEvent event) {
FileChooser.ExtensionFilter extention= new FileChooser.ExtensionFilter("Music Files", "*.mp3","*.m4a","*.aif","*.wav","*.m3u","*.m3u8");
FileChooser fc= new FileChooser();
fc.setInitialDirectory(new File(System.getenv("userprofile")));
fc.setTitle("Select File(s)");
fc.getExtensionFilters().add(extention);
selectedFiles =fc.showOpenMultipleDialog(root.getScene().getWindow());
if(selectedFiles != null &&!selectedFiles.isEmpty()){
listFiles();
}
}
/**
* Convert each fie selected to its URI
*/
private void listFiles(){
try {
for (File file : selectedFiles) {
readMetaData(file.toURI().toString());
synchronized(obj){
obj.wait(100);
}
}
} catch (InterruptedException ex) {
}
System.gc();
}
/**
* Read a Media source metadata
* Note: Sometimes the was unable to extract the metadata especially when
* i have selected large number of files reasons i don't known why
* #param mediaURI Media file URI
*/
private void readMetaData(String mediaURI){
final MediaPlayer mp= new MediaPlayer(new Media(mediaURI));
mp.setOnReady(new Runnable() {
#Override
public void run() {
String artistName=(String) mp.getMedia().getMetadata().get("artist");
ol.add(artistName);
synchronized(obj){//this is required since mp.setOnReady creates a new thread and our loopp in the main thread
obj.notify();// the loop has to wait unitl we are able to get the media metadata thats why use .wait() and .notify() to synce the two threads(main thread and MediaPlayer thread)
}
}
});
}
}
the few changes that have made is used an ObservableList to store the artist name from the metadata
in the code you will find this
synchronized(obj){
obj.wait(100);
}
I do this because the mediaplayer .setOnReady() creates a new thread and the loop is in the main application thread, The loop has to wait for some time before the other thread is created and we are able to extract the metadata, and in the .setOnReady() there is a
synchronized(obj){
obj.notify;
}
to wake up the main thread hence the loop is able to move to the next item
I admit that this may not be the best solution to do this but am welcomed to anyone who has any better way on how to read JavaFx media metadata from a list of files
The full Netbeans project can be found here https://docs.google.com/file/d/0BxDEmOcXqnCLSTFHbTVFcGIzT1E/edit?usp=sharing
plus have created a small MediaPlayer Application using JavaFX which expolits use of the metadata https://docs.google.com/file/d/0BxDEmOcXqnCLR1Z0VGN4ZlJkbUU/edit?usp=sharing
You can use the following function to retrieve the metadata for a given Media object:
public static void initializeMetaData(Media media) {
final Ref<Boolean> ready = new Ref<>(false);
MediaPlayer mediaPlayer = new MediaPlayer(media);
mediaPlayer.setOnReady(() -> {
synchronized (ready) {
ready.set(false);
ready.notify();
}
});
synchronized (ready) {
if (!ready.get()) {
try {
ready.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
However, do not call initializeMetaData from a JavaFX thread, otherwise the thread runs into a deadlock.
PS: It's really ridiculous that one has to build such a workaround. I hope that in future Media will provide an initialize() method which does this job.
My solution to that issue was this:
public class MediaListener implements MapChangeListener<String, Object>
{
public String title = null;
public String artist = null;
public String album = null;
private final Consumer<MediaListener> handler;
private boolean handled = false;
public MediaListener(Consumer<MediaListener> handler)
{
this.handler = handler;
}
#Override
public void onChanged(MapChangeListener.Change<? extends String, ?> ch)
{
if (ch.wasAdded())
{
String key = ch.getKey();
switch (key)
{
case "title":
title = (String) ch.getValueAdded();
break;
case "artist":
artist = (String) ch.getValueAdded();
break;
case "album":
album = (String) ch.getValueAdded();
break;
}
if (!handled && title != null && artist != null && album != null)
{
handler.accept(this);
handled = true;
}
}
}
}
It may not be the best way but it's way cleaner than creating a new MediaPlayer per file.
Example usage:
Media media = Util.createMedia(path);
media.getMetadata().addListener(new MediaListener((data) ->
{
// Use the data object to access the media
}));