I'm creating an android app and i have a relatively large amount of data (mostly in text form and as key->string pairs) that i want to display in my app. The problem is i don't want to enter the data in my app's code,meaning feel each TextView manually with the associated data.i don't feel that to be right! I want my app to read this data from a file(maybe a JSON?) and then associate each key-> string pair with the related TexView. To be more clear, i need to read from a prepared text file and use that text inside my app, AND i want to do this offline,i dont want to use any webservic How should i accomplish this? should i use a database or room?Then how should i feel the database manually without using insert codes inside the app?
Use Volley for JSON Parsing
private static final String url ="your url";
Create a method
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Please wait, while we load the data");
progressDialog.show();
*make a String or JSON request*
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET,
newurl, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d("response", response.toString());
Log.i("updated Url",newurl);
progressDialog.dismiss();
*then move into the json and create JSON object or JSON Array to get their String values*
try {
JSONObject data = response.getJSONObject("data");
JSONArray onwardflights = data.getJSONArray("data_key");
for (int i = 0; i < onwardflights.length(); i++) {
JSONObject onwardFlightsChild = onwardflights.getJSONObject(i);
String arrival,deparutre,duration,flightno,grossamount,image,direct;
JSONObject object = onwardFlightsChild.getJSONObject("data_key");
Onwardflights onwardflights1 = new Onwardflights(
arrival = onwardFlightsChild.getString("data_key"),
deparutre = onwardFlightsChild.getString("data_key"),
duration = onwardFlightsChild.getString("data_key"),
flightno = onwardFlightsChild.getString("data_key"),
direct = onwardFlightsChild.getString("data_key"),
origin = onwardFlightsChild.getString("data_key"));
Log.i("Origin",origin);
Fare fare = new Fare(
grossamount = object.getString("data_key")
);
onwardflights1.setFare(fare);
suggestionmodel.add(onwardflights1);
}
*Create an instance of adapter and pass the parameters*
RecyclerAdapter recyclerAdapter = new RecyclerAdapter(suggestionmodel,getApplicationContext());
recyclerView.setAdapter(recyclerAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("THIS", "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(jsonObjReq);
}
You could simply use a JSON file. Now, the question is: How do you ship a JSON file with your app so that it's available at Runtime? You can use any of these methods:
Put it in the directory res/raw/
and read it using the Resources class (it has a openRawResource()
method)
Put it in the assets/
directory and read it in using the AssetManager class (it has a open()
method that returns an InputStream)
I hope this helps... Merry coding!
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