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In my android app I can't access my json file in my assets folder. It keeps giving me a FileNotFoundException.

Without reading it directly into a InputStream I want to get the location of the json file instead. I have tried using /main/assets/data.json or ///android_assets/data.json or /assets/data.json.

The main purpose of this is to pass a string that holds the location of the json file to another class.

Is there a way to have the location of the json file in the assets file be returned to me? Is there anywhere I can check to make sure my app recognizes that the assets folder is even a part of the application?

EDIT:

In my Activity

public void loadData(){ String location = "file:///android_assets/data.json"; JSONHandler json = new JSONHandler(); List<ListItemObject> list = json.getJSONFile(location); }

In my JSONHandler Class

public ListItemObject getJSONFile(String Location){ File file = new File(address); InputStream in; InputStreamReader isr; JsonReader jr; List<SMRListItemObject> messages = null; try{ in = new FileInputStream(file); isr = new InputStreamReader(in,"UTF-8"); jr = new JsonReader(isr); messages = readMessagesArray(jr); jr.close(); isr.close(); in.close(); } catch (FileNotFoundException e) { Log.d("Exception", "File Not Found"); } catch (IOException e) { Log.d("Exception", "IO problem"); } return messages; }

The line where I am calling the getJSONFile is where I am getting the FileNotFoundException being thrown.

Error message:

02-26 02:38:01.086 27165-27165/com.example.generalcounsel.sm D/OpenGLRenderer﹕ Enabling debug mode 0 02-26 02:38:01.817 27165-27165/com.example.generalcounsel.sm D/Exception﹕ File Not Found 02-26 02:38:01.817 27165-27165/com.example.generalcounsel.sm D/AndroidRuntime﹕ Shutting down VM 02-26 02:13:59.690 25369-25369/com.example.generalcounsel.sm W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x418a5da0) 02-26 02:13:59.690 25369-25369/com.example.generalcounsel.sm E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.generalcounsel.sm, PID: 25369 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.generalcounsel.sm/com.example.generalcounsel.sm.ListActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363) at android.app.ActivityThread.access$900(ActivityThread.java:161) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:157) at android.app.ActivityThread.main(ActivityThread.java:5356) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at com.example.generalcounsel.sm.ListActivity.loadData(ListActivity.java:72) at com.example.generalcounsel.sm.ListActivity.onCreate(ListActivity.java:51) at android.app.Activity.performCreate(Activity.java:5426) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)

            

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  • please put your code to show to where are you making mistake Commented Feb 26, 2015 at 6:48
  • @Vaishali I don't have much code right now. I have a string which is supposed to hold the full path of the json file in my assets folder (this is whats not working). All paths I try like the ones listed above haven't worked. Anyway then the string will be passed to my json parser class for further manipulation. Commented Feb 26, 2015 at 7:10
  • there might be issue other than the path, plz post your code so that the community might be able to help you Commented Feb 26, 2015 at 7:20
  • @Neji edited my post with my code and error message Commented Feb 26, 2015 at 8:03
  • exception is in loadData() post code of the function! Commented Feb 26, 2015 at 9:33

1 Answer 1

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3

try opening file using following way

AssetManager assetManager = getAssets(); InputStream ims = assetManager.open("data.json");

Also, getAssets() only works with a context, you may need context to call it in class other than activity.

Read json file from assets using following code

public String loadJSONFromAsset() { String json = null; try { InputStream is = getAssets().open("file_name.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; }

and then parse into a json object using following code

JSONObject obj = new JSONObject(json_return_by_the_function);
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2 Comments

Is there anyway though to get the full path of the json file in terms of a string?
there is no absolute path as assets are stored in apk. Still, you can use file:///android_asset to reference to files in assets

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