www.rgrfm.be/rgrsite/maxradio/android.php
www.rgrfm.be/rgrsite/maxradio/onair.txt
The track information of the music being played is contained in onair.txt. android.php is a php script I wrote.
I need to display the track information in my Android application. I do not want do download it to disk but keep it in memory. I don't know if the php script is useless because it would create additional overhead. So it's probably better to simply parse onair.txt
InputStream is = new URL("http://www.rgrfm.be/rgrsite/maxradio/onair.txt").openStream();
I am stuck with this. Has anyone got time to help me?
As described, php script seems useless. Since, you can directly read the text file. So, first read it as text, then parse it.
URL url = new URL("http://www.rgrfm.be/rgrsite/maxradio/onair.txt");
String text = readAsText(url)
parse(text);
String readAsText(URL url) {
// read the url as text here.
}
void parse(String text) {
}
Related
I was learning to make quiz app from online and it is going well. I was wondering instead of reading json from assets , it will be wise to read from online such that question can be added or changes accordingly and user don't have to update app.
Here is the JSON Structure.
{"questions" : [{"category":"general","question": "Grand Central Terminal, Park Avenue, New York is the world's", "choices": ["largest railway station","highest railway station","longest railway station","None of the above"], "correctAnswer":0},
{"category":"science","question": "Entomology is the science that studies", "choices": ["Behavior of human beings","Insects","The origin and history of technical and scientific terms","the formation of rocks"], "correctAnswer":1},
{"category":"science", "question":"What is known as the 'master gland' of the human body?", "choices":["Thyroid gland","Pituitary gland","Pineal gland","Pancreas"],"correctAnswer":1}
]}
and the code to read from assets is
private String loadJSONFromAsset() {
String json = null;
try {
InputStream is = mContext.getAssets().open("questionsJSON.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
I would like to show progress loading dialog when next question loads and any help will be largely appreciated. Thanks in advance.
Best option will be using REST APIs, Get data from Server/Database, which can be edited anytime from anywhere
You can learn to use Node js, it is not hard and it is based on JavaScript.
For getting JSON from APIs you can use Retrofit
Learning and implementing these things will be a bit hard if you are beginner but it will be the best option for long run
hope this helped!
Maybe consider using two different threads (or Runnables), one thread for downloading the JSON content and the other thread for displaying the GUI. For example, take a look at this: Stackoverflow Post
The solution involved making a Runnable that would first start downloading the data from the online website and then update the current progress onto the GUI thread as it is downloading. He uses the BufferedInputStream class so he can use a while loop to read the data in, update the number of bytes downloaded, get the current progress, and then display the results. I suppose you can do something similar here by using a while loop, and then checking if the download is finished. If so, you can close the display.
(After months of surfing the internet, talking to the school's computing department and try code out, I still don't get how to do it, but I do know more specific about what I trying to do)
Previously I said I want to "Add lines" to a existing JSON file.
What I want to do is simply add an element to an JSON object from a file, then save the file.
However I am still confused about how to do it.
The process I am guessing is to use ajax to load the content of the file (the JSON code in the file) into a variable then add the new element into the object then save the file.
I have seen a lot of code but are all just too confusing and looks like its for webpages. I am trying to edit a file on the computer as a program which I think webpage related code such as xmlhttp requests are irrelevant as the file is in a folder in appdata.
I have been confused and thought Java and Javascript were the same thing, I know now they're not.
What code or functions would I look for and how would it be used in the code?
(Please don't post pseudocode because I have no idea how to write the code for them since I have literally no idea how to code anything other than a html webpage and some php. Other coding language like Java, Javascript and Python I have little knowledge with but not enough to write a program alone.)
I think it would be best to use code that somebody else has already written to manipulate the JSON. There are plenty of libraries for that, and the best would be the officially specified one, JSON-P. What you would do is this:
Go to http://jsonp.java.net/ and download JSON-P. (You will have to examine the page carefully to find the link to "JSON Processing RI jar".) You will need to include this JAR in your class path while you write your program.
Add imports to your program for javax.json.*.
Write this code to do the job (you will have to catch JsonExceptions and IOExceptions):
JsonReader reader = Json.createReader(new FileReader("launcher_profiles.json"));
JsonObject file = reader.readObject();
reader.close();
JsonObject profiles = file.getJsonObject("profiles");
JsonObject newProfile = Json.createObjectBuilder()
.add("name", "New Lines")
.add("gameDir", "New Lines")
.add("lastVersionId", "New Lines")
.add("playerUUID", "")
.build();
JsonObjectBuilder objectBuilder = Json.createObjectBuilder()
.add("New Profile Name", newProfile);
for (java.util.Map.Entry<String, JsonValue> entry : profiles.entrySet())
objectBuilder.add(entry.getKey(), entry.getValue());
JsonObject newProfiles = objectBuilder.build();
// Now, figure out what I have done so far and write the rest of the code yourself! At the end, use this code to write out the new file:
JsonWriter writer = Json.createWriter(new FileWriter("launcher_profiles.json"));
writer.writeObject(newFile);
writer.close();
I am trying to learn how to read from an XML file (getting it from a url) over Http in Java and am pretty confused as to where I should start. I know how to parse an XML document and print the text associated with the elements to the screen and basic manipulation like that but I am trying to take it a little further.
If anyone could provide me with somewhere to start or any tips that would be much appreciated. I would be more than happy to provide more specifics if that is needed. Thanks!
It seems like you already know how to deal with XML, you're just asking how to get the XML over HTTP. This code should work.
URLConnection connection = new URL(urlThatReturnsXml).openConnection();
InputStream is = connection.getInputStream();
String responseAsString = org.apache.commons.io.IOUtils.toString(is);
Make a java.net.URL object from the url string and call openStream() on it. You now have an InputStream to read from. That should get you going.
I'm attempting to pass a large/long string, a PDF binary read from disk, into a Java app and so far am having very little success. The app works when I read the file in from a local disk, so I know the problem is related to how I'm importing the data. Roughly this is what I'm looking at:
I'm reading, manipulating the pdf in PHP and using exec(); to touch the Java app, this is where I'm at with the Java:
Works:
File input = new File("C:\\Users\\Jack\\Downloads\\col_terror.pdf");
document = PDDocument.load(input);
Does not work:
PHP:
exec("/path/to/jar/java -jar JavaAppHere.jar $pdf_string",$ouput);
Java:
public static void main(String[] args) throws Exception {
...
document = PDDocument.load( args[0] );
...
}
I feel this is something quite simple I am not understanding about passing strings as args, though it has been a couple years since I've made a venture into the land of Java.
Please read the Javadoc of PDDocument. If PDDocument refers to PDDocument you can see that you are passing data while PDDocument.load(java.lang.String) expects the filename.
You also don't seem to encode $pdf_string with escapeshellarg()
Since there are too many variables invovled in passing binary data around as shell arguments, I'd advice against it.
The easiest solution is to write the PDF to a temporary file and pass the filename to java. The alternative is to pass the PDF data via stdin.
I've tried this approach:
http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800620/How_To_-_Add_plain_text_or_binary_files_to_an_application.html?nodeid=800687&vernum=0
But it's REALLY slow for slightly large text files. Does anyone know of a better way of reading a plain text file that is included in the project? Is there a way to use FileConnection?
Figured it out using a combination of information:
IOUtilities.streamToBytes(is);
Directly on the input stream. So a more complete example would be as follows:
Class classs = Class.forName("com.packagename.stuff.FileDemo");
InputStream is = classs.getResourceAsStream("/test");
byte[] data = IOUtilities.streamToBytes(is);
String result = new String(data);
Deal? Deal.