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Here is how my app is laid out: onResume() user is prompted to login If user logs in, he can continue using the app 3. If the user logs out at any time, I want to prompt login again How can I achieve this? Here is my MainActivity: @Override protected void onResume(){ super.onResume(); isLoggedIn = prefs.getBoolean("isLoggedIn", false); if(!isLoggedIn){ showLoginActivity(); } } Here is my LoginActivity: @Override protected void onPostExecute(JSONObject json) { String authorized = "200"; String unauthorized = "401"; String notfound = "404"; String status = new String(); try { // Get the messages array JSONObject response = json.getJSONObject("response"); status = response.getString("status"); if(status.equals(authorized)){ Toast.makeText(getApplicationContext(), "You have been logged into the app!",Toast.LENGTH_SHORT).show(); prefs.edit().putBoolean("isLoggedIn",true); setResult(RESULT_OK, getIntent()); finish(); } else if (status.equals(unauthorized)){ Toast.makeText(getApplicationContext(), "The username and password you provided are incorrect!",Toast.LENGTH_SHORT).show(); prefs.edit().putBoolean("isLoggedIn",true); } else if(status.equals(notfound)){ Toast.makeText(getApplicationContext(), "Not found",Toast.LENGTH_SHORT).show(); prefs.edit().putBoolean("isLoggedIn",true); } } catch (JSONException e) { System.out.println(e); } catch (NullPointerException e) { System.out.prin

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