Revenir à une activité précédente

Bonjour à tous,

J'ai actuellement deux activités faisant des requêtes HTTP. Sur la deuxième activité, il y a un bouton précédent. J'aimerai pouvoir revenir sur la première activité sans perdre d'informations car à l'heure actuelle je perds toutes les informations récupérées.

Première activité:

public class GetChildrenList extends AppCompatActivity implements View.OnClickListener {
    private ArrayList<Child> childrenImeList = new ArrayList<Child>();
 
    private ListView itemsListView;
    private TextView tv_signin_success;
 
    String email;
    String password;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.get_children_list);
 
        String infos_user = (String) getIntent().getSerializableExtra("infos_user");
 
        tv_signin_success = (TextView) findViewById(R.id.tv_signin_success);
 
 
        tv_signin_success.setText("Bonjour " + infos_user + "!");
 
        itemsListView  = (ListView)findViewById(R.id.list_view_children);
 
 
        new GetChildrenAsync().execute();
    }
 
    class GetChildrenAsync extends AsyncTask<String, Void, ArrayList<Child>>  {
 
        private Dialog loadingDialog;
 
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            loadingDialog = ProgressDialog.show(GetChildrenList.this, "Please wait", "Loading...");
        }
 
        @Override
        protected ArrayList<Child> doInBackground(String... params) {
 
            InputStream is = null;
 
            int statusCode = 0;
            int id = 0;
            int age = 0;
            email = (String) getIntent().getSerializableExtra("email");
            password = (String) getIntent().getSerializableExtra("password");
            String result = null;
            String first_name = null;
            String last_name = null;
 
 
            try {
                //Http request to communicate with our system
                HttpClient httpClient = new DefaultHttpClient();
 
                HttpGet httpGet = new HttpGet();
                URI website = new URI("http://192.168.1.33:5000/childrenime/list");
                httpGet.setURI(website);
 
                String base64EncodedCredentials = Base64.encodeToString(
                        (email + ":" + password).getBytes(),
                        Base64.NO_WRAP);
 
                httpGet.setHeader("Authorization", "Basic " + base64EncodedCredentials);
 
                HttpResponse response = httpClient.execute(httpGet);
 
                statusCode = response.getStatusLine().getStatusCode();
 
                HttpEntity entity = response.getEntity();
                is = entity.getContent();
 
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();
 
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
                result = sb.toString();
                String jsonResult = "{ \"children\":" + result + "}";
 
                Log.d("result1", jsonResult);
 
                //Manage JSON result
                JSONObject jsonObject = new JSONObject(jsonResult);
                JSONArray childrenArray = jsonObject.getJSONArray("children");
 
                for (int i = 0; i < childrenArray.length(); ++i) {
                    JSONObject child = childrenArray.getJSONObject(i);
                    id = child.getInt("id");
                    first_name = child.getString("first_name");
                    last_name = child.getString("last_name");
                    age = child.getInt("age");
 
                    String name = first_name + " " + last_name;
 
                    childrenImeList.add(new Child(id,name,age));
                }
 
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }
 
            return childrenImeList;
 
        }
 
        @Override
        protected void onPostExecute(final ArrayList<Child> childrenListInformation) {
            loadingDialog.dismiss();
            CustomListChildrenAdapter adapter = new CustomListChildrenAdapter(GetChildrenList.this, childrenListInformation);
            itemsListView.setAdapter(adapter);
        }
    }
}

Deuxième activité:

public class GetLearningGoalsList extends AppCompatActivity implements View.OnClickListener {
    private ArrayList<LearningGoal> childrenLearningList = new ArrayList<LearningGoal>();
 
    private Button btn_previous;
    private ListView itemsListView;
 
    String email;
    String password;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.get_learning_goals_list);
 
        btn_previous = (Button) findViewById(R.id.btn_previous);
 
        btn_previous.setOnClickListener(this);
 
        itemsListView  = (ListView)findViewById(R.id.list_view_learning_goals);
 
 
        new GetLearningGoalsAsync().execute();
    }
 
    @Override
    public void onClick(View v) {
        Intent myIntent = new Intent(GetLearningGoalsList.this, GetChildrenList.class);
        myIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(myIntent);
        finish();
        return;
    }
 
    class GetLearningGoalsAsync extends AsyncTask<String, Void, ArrayList<LearningGoal>>  {
 
        private Dialog loadingDialog;
 
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            loadingDialog = ProgressDialog.show(GetLearningGoalsList.this, "Please wait", "Loading...");
        }
 
        @Override
        protected ArrayList<LearningGoal> doInBackground(String... params) {
 
            InputStream is = null;
 
            int statusCode = 0;
            int id = 0;
            email = (String) getIntent().getSerializableExtra("email");
            password = (String) getIntent().getSerializableExtra("password");
            int idChild = (int) getIntent().getSerializableExtra("idChild");
            String json = null;
            String result = null;
            String name = null;
            String start_date = null;
            String end_date = null;
 
            try {
                //Http request to communicate with our system
                HttpClient httpClient = new DefaultHttpClient();
 
                HttpPost httpPost = new HttpPost();
                URI website = new URI("http://192.168.1.33:5000/learningchild/list");
                httpPost.setURI(website);
 
                JSONObject jsonObj = new JSONObject();
                jsonObj.accumulate("idChild", idChild);
 
                json = jsonObj.toString();
 
                StringEntity se = new StringEntity(json);
 
                httpPost.setEntity(se);
 
                String base64EncodedCredentials = Base64.encodeToString(
                        (email + ":" + password).getBytes(),
                        Base64.NO_WRAP);
 
                httpPost.setHeader("Authorization", "Basic " + base64EncodedCredentials);
                httpPost.setHeader("Accept", "application/json");
                httpPost.setHeader("Content-type", "application/json");
 
                HttpResponse response = httpClient.execute(httpPost);
 
                statusCode = response.getStatusLine().getStatusCode();
 
                HttpEntity entity = response.getEntity();
                is = entity.getContent();
 
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();
 
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
                result = sb.toString();
                String jsonResult = "{ \"learningGoals\":" + result + "}";
 
                Log.d("result1", jsonResult);
 
                //Manage JSON result
                JSONObject jsonObject = new JSONObject(jsonResult);
                JSONArray learningGoalsArray = jsonObject.getJSONArray("learningGoals");
 
                for (int i = 0; i < learningGoalsArray.length(); ++i) {
                    JSONObject learningGoal = learningGoalsArray.getJSONObject(i);
                    id = learningGoal.getInt("id");
                    name = learningGoal.getString("name");
                    start_date = learningGoal.getString("start_date");
                    end_date = learningGoal.getString("end_date");
 
 
                    childrenLearningList.add(new LearningGoal(id,name,start_date,end_date));
                }
 
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }
 
            return childrenLearningList;
 
        }
 
        @Override
        protected void onPostExecute(final ArrayList<LearningGoal> learningListInformation) {
            loadingDialog.dismiss();
            CustomListLearningGoalAdapter adapter = new CustomListLearningGoalAdapter(GetLearningGoalsList.this, learningListInformation);
            itemsListView.setAdapter(adapter);
        }
    }
}

Comment pourrai-je faire pour ne pas perdre d'informations?

Merci à vous.