title: Write JSON to a File
body: <p>I have a class compositionJSON. The class has a method calls makeJSONObject, that creates a JSON-Object and put stuff in it. Here is the code of the class.</p>
  
  <pre><code>public class CompositionJso extends JSONObject {
  
  
  
  public JSONObject makeJSONObject (String title, String desc, ArrayList&lt;String&gt; imgPath, ArrayList&lt;Resources&gt; imgView) {
  
      JSONObject obj = new JSONObject() ;
  
      try {
          obj.put("title", title);
          obj.put("desc", desc);
          obj.put("imgPath", imgPath);
          obj.put("imgViewPath", imgView);
      } catch (JSONException e) {
          e.printStackTrace();
      }
  
      return obj;
  }
  </code></pre>
  
  <p>Now I create a instance of this class and call the method in another class. After that I want to write the JSONObject to file and save it on the sd card on device. Here is the code:</p>
  
  <pre><code> saveCompo.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              setName();
              createJSONFolder();
              CompositionJso obj = new CompositionJso();
              obj.makeJSONObject(compoTitle, compoDesc, imgPaths, imageViewPaths);
              MyCompositionsListActivity.buildList();
  
              try {
                  Writer output = null;
                  File file = new File("storage/sdcard/MyIdea/MyCompositions/" + compoTitle + ".json");
                  output = new BufferedWriter(new FileWriter(file));
                  output.write(obj.toString());
                  output.close();
                  Toast.makeText(getApplicationContext(), "Composition saved", Toast.LENGTH_LONG).show();
  
              } catch (Exception e) {
                  Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_LONG).show();
              }
              finish();
          }
      });
  </code></pre>
  
  <p>The file is saving successfully but if I open it, there is nothing inside. What is wrong with the code?</p>