android Activity Intent 到 BaseAdapter

Question

我想知道是否可以通过 Intent 从 Activity 向 BaseAdapter 发送多个信息。

确实，我有一个应用程序 android，我想将用户的邮件发送到包含 listView 的 BaseAdapter。

那么有可能吗？

我尝试这样但我有一个错误：（我发送 onPostExecute() ）

我的活动：

    public class ParticipateActivity extends Activity {

// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapterTournament adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
static String NOMTOURNAMENT = "nomTournament";
static String NBPLAYERSMAX = "nbPlayersMax";
static String MAIL = "mail";

// To know the main user
public String mail;

// IDs for menu items
private static final int MAIN_MENU = Menu.FIRST;

//php server
private static final String LISTTOURN_URL = "http://10.0.0.35/BD_Projet/liste_tournament.php";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Get the view from listview_main.xml
    setContentView(R.layout.activity_participate);


    Intent i = getIntent();
    // Get the result of mail
    mail = i.getStringExtra("mail");
    System.out.println(mail);

    // Execute DownloadJSON AsyncTask
    new DownloadLT().execute();
}

// DownloadJSON AsyncTask
private class DownloadLT extends AsyncTask<Void, Void, Void> {

    // Allow to display an circle Bar
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Create a progressdialog
        mProgressDialog = new ProgressDialog(ParticipateActivity.this);
        // Set progressdialog title
        mProgressDialog.setTitle("Android JSON ListTournaments Michaël KOZA");
        // Set progressdialog message
        mProgressDialog.setMessage("Loading for tournaments...");
        mProgressDialog.setIndeterminate(false);
        // Show progressdialog
        mProgressDialog.show();
    }

    @Override
    protected Void doInBackground(Void... params) {

        List<NameValuePair> args = new ArrayList<NameValuePair>();
        args.add(new BasicNameValuePair("mail", mail));

        // Create an array
        arraylist = new ArrayList<HashMap<String, String>>();
        // Retrieve JSON Objects from the given URL address (We return just tournaments where there are still places to play)
        jsonobject = JSONParser.makeHttpRequest(LISTTOURN_URL, "POST", args);

        // checking  log for json response
        Log.d("Register attempt", jsonobject.toString());

        try {
            // Locate the array name in JSON
            jsonarray = jsonobject.getJSONArray("ListTournaments");

            for (int i = 0; i < jsonarray.length(); i++) {
                HashMap<String, String> map = new HashMap<String, String>();
                jsonobject = jsonarray.getJSONObject(i);
                // Retrive JSON Objects
                map.put("nomTournament", jsonobject.getString("nomTournament"));
                map.put("nbPlayersMax", jsonobject.getString("nbPlayersMax"));
                // Set the JSON Objects into the array
                arraylist.add(map);
            }

        } catch (JSONException e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void args) {
        // Locate the listview in listview_main.xml
        listview = (ListView) findViewById(R.id.listview);
        // Pass the results into ListViewAdapter.java
        adapter = new ListViewAdapterTournament(ParticipateActivity.this, arraylist);
        // Set the adapter to the ListView
        listview.setAdapter(adapter);
        //intent
        Intent i = new Intent(ParticipateActivity.this,ListViewAdapterTournament.class);
        i.putExtra("mail", mail);
        // Close the progressdialog
        mProgressDialog.dismiss();
    }
}
 }

还有我的 ListView ：

    public class ListViewAdapterTournament extends BaseAdapter {

 // Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
HashMap<String, String> resultp = new HashMap<String, String>();

public String mail, nomT;       

public ListViewAdapterTournament(Context context, ArrayList<HashMap<String, String>> arraylist) {
    this.context = context;
    data = arraylist;
}

/* Permet de savoir le nombre d'item à afficher dans le liste view */
public int getCount() {
    return data.size();
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return 0;
}

public View getView(final int position, View convertView, ViewGroup parent) {
    // Declare Variables
    TextView nomTournament;
    TextView nbPlayersMax;

    inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View itemView = inflater.inflate(R.layout.activity_list_view_adapter_tournament, parent, false);
    // Get the position
    resultp = data.get(position);

    //receive the mail
    Intent i = getIntent();             //error 
    // Get the result of mail
    mail = i.getStringExtra("mail");

    // Locate the TextViews in listview_item.xml
    nomTournament = (TextView) itemView.findViewById(R.id.nomTournament);
    nbPlayersMax = (TextView) itemView.findViewById(R.id.nbPlayersMax);

    // Capture position and set results to the TextViews
    nomTournament.setText(resultp.get(ParticipateActivity.NOMTOURNAMENT));
    nbPlayersMax.setText(resultp.get(ParticipateActivity.NBPLAYERSMAX));


    // Capture ListView item click
    itemView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // Get the position
            Intent intent = new Intent(context, ChooseTeam.class);
            mail = resultp.get(ParticipateActivity.MAIL);
            System.out.println(mail);
            intent.putExtra("mail", mail);
            intent.putExtra("nomTournament", nomT);
            // Click on item, on enregistre le joueur dans le tournament et on lui demande de choisir team
            context.startActivity(intent);

        }
    });
    return itemView;
    }
}

非常感谢您的帮助

米奇74

Answer 1

要在另一个活动中发送信息而不打开另一个活动，您必须通过共享首选项。

要发送您必须这样做的信息：

     SharedPreferences myPrefs = this.getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
    SharedPreferences.Editor prefsEditor = myPrefs.edit();
    prefsEditor.putString(MY_NAME, "Mickey74");
    prefsEditor.commit();

并在另一项活动中使用此信息至迟到：

    SharedPreferences myPrefs = this.getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
    String prefName = myPrefs.getString(MY_NAME, "nothing");
    System.out.println(prefName);

结果必须是：Mickey74

非常感谢您的帮助。

米奇74