java - 如何将 json 数据存储到共享首选项？

Question

我需要将userid存储在共享首选项中并在第二个 Activity 中使用它，但我不知道该怎么做。如何仅存储 id 并在第二个 Activity 中调用它？

这是我的代码:

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {

                    try {
                        Boolean esito = response.getBoolean("Esito");

                        if (esito) {

                            JSONArray jsonArray = response.getJSONArray("Dati");

                            Log.d("JSON", String.valueOf(esito));

                            for (int i = 0; i < jsonArray.length(); i++) {

                                JSONObject dato = jsonArray.getJSONObject(i);

                                String id = dato.getString("id");
                                String fullname = dato.getString("fullname");
                                String username = dato.getString("username");
                                String password = dato.getString("password");


                                //mTextViewResult.append(id + ", " + fullname +  ", " + username +  ", " + password + "\n\n");

                                startActivity(new Intent(getApplicationContext(),LoggedActivity.class));

                            }
                        } else {

                            Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                        }

                    } catch (JSONException e) {
                        e.printStackTrace();
                        Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                    }

                }
            }

Answer 1

如果您只想在第二个 Activity 中使用数据，则只需使用 Intent 来传递数据，Intent 有 putExtra() 方法，通过使用此方法您可以在 Activity 之间传递数据。

看这个，

JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {

                    try {
                        Boolean esito = response.getBoolean("Esito");

                        if (esito) {

                            JSONArray jsonArray = response.getJSONArray("Dati");

                            Log.d("JSON", String.valueOf(esito));

                            for (int i = 0; i < jsonArray.length(); i++) {

                                JSONObject dato = jsonArray.getJSONObject(i);

                                String id = dato.getString("id");
                                String fullname = dato.getString("fullname");
                                String username = dato.getString("username");
                                String password = dato.getString("password");


                                //mTextViewResult.append(id + ", " + fullname +  ", " + username +  ", " + password + "\n\n");
                                Intent intent = new Intent(getApplicationContext(),LoggedActivity.class)
                                intent.putExtra("id",id);
                                startActivity(intent);

                            }
                        } else {

                            Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                        }

                    } catch (JSONException e) {
                        e.printStackTrace();
                        Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                    }

                }
            }

但是如果您确实想将数据存储在 SharedPreference 中，则使用它，

JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {

                    try {
                        Boolean esito = response.getBoolean("Esito");

                        if (esito) {

                            JSONArray jsonArray = response.getJSONArray("Dati");

                            Log.d("JSON", String.valueOf(esito));

                            for (int i = 0; i < jsonArray.length(); i++) {

                                JSONObject dato = jsonArray.getJSONObject(i);

                                String id = dato.getString("id");
                                String fullname = dato.getString("fullname");
                                String username = dato.getString("username");
                                String password = dato.getString("password");

                                SharedPreferences.Editor editor = getSharedPreferences(YOUR_SHARED_PEREFENCE_NAME, MODE_PRIVATE).edit();
                                editor.putString("id", id);
                                editor.commit();

                                //mTextViewResult.append(id + ", " + fullname +  ", " + username +  ", " + password + "\n\n");

                                startActivity(new Intent(getApplicationContext(),LoggedActivity.class));

                            }
                        } else {

                            Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                        }

                    } catch (JSONException e) {
                        e.printStackTrace();
                        Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();
                    }

                }
            }