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活动中使用它，但我不知道该怎么做。我怎样才能只存储id 并在第二个活动中调用它？

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

如果你只想在第二个activity中使用数据，那么只需使用intent来传递数据，intent有putExtra()方法，通过这个方法你可以在activity之间传递数据。

看到这个，

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();
                    }

                }
            }

但如果你真的想将数据存储在SharedPreference 中，请使用它，

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();
                    }

                }
            }

Answer 2

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(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putString("id", id);
 editor.putString("fullname", fullname);
 editor.putString("username", username);
 editor.putString("password", password);
 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();
                    }

                }
            }