You can save JSON when you call web service. You must use the same methods which was used last item.
When you read this JSON, you must use Gson library.
public void returnJSONToYourModel() {
final String json = Utils.readFromFile(MainActivity.this);
final Gson gson = new Gson();
final YourModel yourModel = gson.fromJson(json, YourModel.class);
}
It’s very esay to read and write from a file.
public static void writeToFile(String data, Activity activity) {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(
activity.openFileOutput("config.txt", Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
} catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
public static String readFromFile(Activity activity) {
String ret = "";
try {
InputStream inputStream = activity.openFileInput("config.txt");
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(
inputStream);
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ((receiveString = bufferedReader.readLine()) != null) {
stringBuilder.append(receiveString);
}
inputStream.close();
ret = stringBuilder.toString();
}
} catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
return ret;
}