CODEWITHSUNDEEP
android
user533844
user533844

Reputation: 2063

working as java application not as android application

I am reading a json file from a local drive and making it as gson. And it's working as a java application.

    Gson gson = new Gson();
    BufferedReader br = new BufferedReader(new FileReader("D:\\AircraftService.json"));
    DataObject[] obj = gson.fromJson(br, DataObject[].class);
    System.out.println("The object length is: " + obj.length);
    for(int i = 0; i<obj.length ; i++ )
    {
        System.out.println(obj[i].AC + "  " + obj[i].Fleet + " " + obj[i].SubFleet);
    }

Using this I am trying to populate an android list 

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listplaceholder);
    ListView lv= (ListView)findViewById(R.id.list); 

    Gson gson = new Gson();
    BufferedReader br = new BufferedReader(new FileReader("D:\\AircraftService.json"));

DataObject[] obj = gson.fromJson(br, DataObject[].class);
List<HashMap<String, String>> fillMaps = new ArrayList<HashMap<String, String>>(); 
for(int i=0 ; i<obj.length ; i++){      

    HashMap<String, String> map = new HashMap<String, String>();
    map.put("AC",  obj[i].AC);
    map.put("Fleet", obj[i].Fleet );
    map.put("SubFleet", obj[i].SubFleet );
    fillMaps.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(this, fillMaps, R.layout.main, new String[] {"AC", "Fleet"}, new int[] {R.id.ac, R.id.fleet});  
lv.setAdapter(adapter);  
}

It's not able to populate the obj. Ouput is blank. Can you tell me where I am going wrong.

Upvotes: 0

Views: 166

Answers (2)

user658042
user658042

Reputation:

I'm sure your file does not reside in D:\AircraftService.json on your android device. Adjust the path, use Environment.getExternalStorageDirectory() to get the path to your SD-card or flash-memory if you stored your file there. If you stored it inside your apps asset folder, use file:///android_asset/ as your base path and append the file name (and subfolders).

Edit: Considering your comment down below, here's a short howto.

First of all I recommend storing the file in your assets, since reading the sdcard requires a seperate permission for your app.

Theres a folder in your project thats called res/. Create a subfolder into that, name it raw. Thats a standard android naming convention for storing files that are not standard resources (like layouts or strings). After that you should be able to access the file with the path file:///android_asset/raw/AircraftService.json

Upvotes: 1

Nikola Despotoski
Nikola Despotoski

Reputation: 50578

The path of the json file cannot be opened. Try moving the file lets say in assets folder than open it.

Upvotes: 0

Related Questions