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POHow to edit an item in a json file?
 

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  1. POHow to edit an item in a json file?
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    <p>I have this structure that is generated by my application and I read in a listView:</p> <pre><code>[{ "phone": "202020", "name": "Jhon", "id": 10, "age": 20 }, { "phone": "303030", "name": "Rose", "id": 11, "age": 22 }] </code></pre> <p>When I select an item in the listview, I open a screen form passing the values ​​of the clicked item.</p> <pre><code>lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { // getting values from selected ListItem String name = ((TextView) view.findViewById(R.id.name)).getText().toString(); String age = ((TextView) view.findViewById(R.id.age)).getText().toString(); String phone = ((TextView) view.findViewById(R.id.phone)).getText().toString(); // Starting new intent Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class); in.putExtra(TAG_NAME, name); in.putExtra(TAG_AGGE, age); in.putExtra(TAG_PHONE, phone); startActivity(in); } }); </code></pre> <p>This screen opens when you click on the item is a form where I put the values ​​passed from the previous screen fields.</p> <p>My question is: When you click save in this form, I have to get the new values ​​and update the json file. How to do this?</p> <p>Ex: I want to change the record ID 22, which is the user Rose.</p> <p>ADD MORE INFORMATION:</p> <p>I already use the Gson to generate items.</p> <p>Code to generate:</p> <pre><code>btnSalvar.setOnClickListener( new View.OnClickListener() { public void onClick(View v) { gson = new GsonBuilder().setPrettyPrinting().create(); final File file = new File(Environment.getExternalStorageDirectory() + "/download/ibbca/auditar.json"); // to check if file exists before before it maybe will be created if (file.exists()) fileExists = true; try{ // create file or get access to file raf = new RandomAccessFile(file, "rw"); if (fileExists) // start new file as an array raf.seek(file.length() - 1); else { // start writing inside the bracket raf.writeBytes("["); raf.seek(file.length()); } UserTestJson obj1 = new UserTestJson(); obj1.setId(10); obj1.setName("Jhon"); obj1.setAge(20); obj1.setPhone("202020"); toJson(obj1); // end file raf.writeBytes("]"); raf.close(); }catch(FileNotFoundException f){ f.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); </code></pre> <p>And the Class UserTestJson, i created with get and seters for each variable.</p>
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