如何在android的另一个类中创建一个iner类的实例？

Question

即时通讯开发一个Android应用程序在我的主要活动我已经使用另一个类MainActivity内部由AssyncTask扩展。我只是想在另一个类中调用Assync任务。我该怎么做？我试了很多办法......这是我的主要活动类

public class MainActivity extends Activity { 

public MainActivity() { 

} 

EditText userName; 
EditText passWord; 
ListView list; 
TextView fname; 
TextView lname; 
TextView stime; 
TextView etime; 
TextView date; 
ImageButton login; 

public static ArrayList<HashMap<String, String>> oslist; 

// URL to get JSON Array 
// private static String url = "http://api.learn2crack.com/android/jsonos/"; 

public static String confirm; 
String firstName; 

// JSON Node Names 
/* 
* static final String TAG_OS = "android"; static final String TAG_VER = 
* "ver"; static final String TAG_NAME = "name"; static final String TAG_API 
* = "api"; 
*/ 

static final String TAG_DATA = "d"; 
static final String TAG_OBJ_1 = "Appointment"; 
static final String TAG_OBJ_2 = "PatientProfile"; 
static final String TAG_PROP_FNAME = "FirstName"; 
static final String TAG_PROP_LNAME = "LastName"; 
static final String TAG_STIME = "StartTime"; 
static final String TAG_ETIME = "EndTime"; 
static final String TAG_DATE = "Date"; 
static final String TAG_HID = "PatientPersonId"; 
static final String TAG_HIDApp = "AppointmentId"; 
static final String TAG_IMG = "ImageURL"; 

// static final String TAG_API = "NickName"; 
JSONArray androids = null; 
JSONObject duplicate; 
public static JSONArray dupArray; 

public JSONArray getJsonArray() { 
    return dupArray; 
} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.loging); 

    if (android.os.Build.VERSION.SDK_INT > 9) 

    { 
     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() 
       .permitAll().build(); 

     StrictMode.setThreadPolicy(policy); 

    } 

    oslist = new ArrayList<HashMap<String, String>>(); 
    login = (ImageButton) findViewById(R.id.imageButton1); 
    new ArrayList<HashMap<String, String>>(); 

    login.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 

      // if login success then call below 
      userName = (EditText) findViewById(R.id.editUserName); 
      passWord = (EditText) findViewById(R.id.editPassWord); 

      String name = userName.getText().toString().trim(); 
      String passwd = passWord.getText().toString().trim(); 

      CheckLogin check = new CheckLogin(); 
      confirm = check.AuthenticateUser(name, passwd); 

      if (!(confirm.equals("-1"))) { 
       new JSONParse().execute(); 
      } 

      else { 

       Toast.makeText(getBaseContext(), 
         "Check Username or Password", Toast.LENGTH_LONG) 
         .show(); 
      } 

     } 
    }); 

} 

@Override 
public void onBackPressed() { 
    // TODO Auto-generated method stub 
    finish(); 
} 

public class JSONParse extends AsyncTask<String, String, JSONObject> { 
    private ProgressDialog pDialog; 

    public JSONParse() { 

    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     fname = (TextView) findViewById(R.id.fname); 
     lname = (TextView) findViewById(R.id.lname); 
     stime = (TextView) findViewById(R.id.stime); 
     etime = (TextView) findViewById(R.id.etime); 
     date = (TextView) findViewById(R.id.blank); 
     pDialog = new ProgressDialog(MainActivity.this); 
     pDialog.setMessage("Getting Data ..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(true); 
     pDialog.show(); 

    } 

    @Override 
    protected JSONObject doInBackground(String... arg0) { 
     // TODO Auto-generated method stub 
     JsonParser jParser = new JsonParser(); 

     // Getting JSON from URL 
     JSONObject json = null; 
     try { 

      JSONObject parm = new JSONObject(); 
      // parm.put("PersonID", confirm); 
      parm.put("caregiverPersonId", confirm); 
      json = jParser.getJSONFromUrl(parm, url); 

     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      // Toast.makeText(getApplicationContext(), 
      // "Hi "+firstName+"You Don't Have Any Requests!", 
      // Toast.LENGTH_LONG).show(); 
     } 
     return json; 
    } 

    @Override 
    protected void onPostExecute(JSONObject json) { 
     // TODO Auto-generated method stub 
     pDialog.dismiss(); 
     try { 
      // Getting JSON Array from URL 
      // JSONObject jobs = json.getJSONObject(TAG_DATA); 

      String emptyjson = json.getString(TAG_DATA); 

      if (emptyjson.equals("[]")) { 

       startActivity(new Intent(MainActivity.this, Empty.class)); 
      } else { 

       androids = json.getJSONArray(TAG_DATA); 

       // JSONObject appt= new JSONObject(json.getString("d")); 

       for (int i = 0; i < androids.length(); i++) { 
        JSONObject c = androids.getJSONObject(i); 

        // Storing JSON item in a Variable 

        JSONObject job = c.getJSONObject(TAG_OBJ_2); 

        String url = job.getString("ImageURL"); 

        firstName = job.getString(TAG_PROP_FNAME); 
        String lastName = job.getString(TAG_PROP_LNAME); 

        JSONObject job_two = c.getJSONObject(TAG_OBJ_1) 
          .getJSONObject("DayTimeSlot"); 

        String start = job_two.getString(TAG_STIME); 
        String end = job_two.getString(TAG_ETIME); 

        /* 
        * String ackwardDate = job_two.getString(TAG_DATE);; 
        * Calendar calendar = Calendar.getInstance(); String 
        * ackwardRipOff = ackwardDate.replace("/Date(", 
        * "").replace(")/", ""); Long timeInMillis = 
        * Long.valueOf(ackwardRipOff); 
        * calendar.setTimeInMillis(timeInMillis); String 
        * theDate = (calendar.getTime().toGMTString()); 
        */ 
        String Ldate = job_two.getString(TAG_DATE); 
        String ackwardRipOff = Ldate.replace("/Date(", "") 
          .replace(")/", ""); 
        Long Ldat = Long.valueOf(ackwardRipOff); 
        Date date = new Date(Ldat); 
        String strdate = (String) DateFormat.format("MM/dd/yy", 
          date); 

        JSONObject toHid = c.getJSONObject(TAG_OBJ_1); 

        String Hid = toHid.getString(TAG_HID); 

        // String date = dateConvert(Ldate); 
        // long Ldate = job_two.getLong("Date"); 

        // String strdate = (String) 
        // DateFormat.format("MM/dd/yy h:mmaa", date); 

        JSONObject job_three = c.getJSONObject(TAG_OBJ_1); 
        String AppoinmentID = job_three.getString(TAG_HIDApp); 

        // Adding value HashMap key => value 

        HashMap<String, String> map = new HashMap<String, String>(); 

        map.put(TAG_PROP_FNAME, firstName); 
        map.put(TAG_PROP_LNAME, lastName); 
        map.put(TAG_STIME, start); 
        map.put(TAG_ETIME, end); 
        map.put(TAG_DATE, strdate); 
        map.put(TAG_HID, Hid); 
        map.put("ImageURL", url); 
        map.put("AppointmentId", AppoinmentID); 

        oslist.add(map); 

        // duplicate = new JSONObject(); 

        Intent reult = new Intent(MainActivity.this, 
          ViewList.class); 
        // reult.putStringArrayListExtra("map", oslist); 
        // startActivity(reult); 

        reult.putExtra("arraylist", oslist); 
        startActivityForResult(reult, 500); 

       } 

       dupArray = new JSONArray(); 
       dupArray.put(oslist); 
      } 

     } catch (JSONException e) { 
      e.printStackTrace(); 
      // Intent reult = new Intent(MainActivity.this,ViewList.class); 
      // reult.putStringArrayListExtra("map", oslist); 
      // startActivity(reult); 

     } 

    } 
} 

public String dateConvert(String d) { 

    Date dt = new Date(); 
    SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy"); 
    String strDate = df.format(dt); 

    return strDate; 

} 

} 

Answer 1

您可以拨打MainActivity.JSONParse，如果它是一个静态类或检查这个答案Can i Create the object of a activity in other class?到如果不是静态的，请参阅如何做。

Answer 2

内部类

OuterClass.InnerClass innerObject = outerObject.new InnerClass(); 

you can find more on inner class here