將數據從班級傳遞到MainActivity

Question

我正在從MainActivity開始中的Service TrackingService。從TrackingService我通過JSONString到PostData類。然後我收到服務器的響應direction, route。我想將這些值傳遞給MainActivity，但我沒有在MainActivity中獲取它們。方向和路線具有值，正在調用，並且正在輸入方法中的此條件if (route != 0) {}，但MainActivity中的'onNewIntent（）'方法未被調用。我該如何解決它以從PostData類獲得MainActivity的方向和路線？

MainActivity類別：

public class MainActivity extends ActionBarActivity implements 
     AsyncTaskCallback { 

    private static Context context; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
         Intent i = new Intent(this, TrackingService.class); 
     startService(i); 
     } 
    public static Context getAppContext() { 
     return context; 
    } 
    @Override 
protected void onNewIntent(Intent intent) { 

    super.onNewIntent(intent); 
    Bundle extras = getIntent().getExtras(); 

    if (extras != null && extras.containsKey("dirtRout")) { 
     String directRoute = extras.getString("dirtRout"); 

     String[] split = directRoute.split(","); 
     String direc = split[0]; 
     String route1 = split[1]; 
     boolean test = true; 
     if (test) { 
      test = false; 
      System.out.println("test f MainActivity: " + direc + ": " 
        + route1); 

      tvD = (TextView) findViewById(R.id.textDirect); 
      tvD.setText(direc); 
      tvR = (TextView) findViewById(R.id.textRoute); 
      tvR.setText(route1); 
     } 
    } 

} 
} 

Trackingservice類：

public class TrackingService extends Service implements AsyncTaskCallback, 
     LocationListener { 
    ... 
    @Override 
    public void onLocationChanged(Location location) { 
         PostData sender = new PostData(TrackingService.this); 
       sender.post_data(jSONString, this); 
} 
    } 

POSTDATA類：

public class PostData { 
    String jSONString; 
    private AsyncTaskCallback callback; 
    public PostData(AsyncTaskCallback callback) { 
     this.callback = callback; 
    } 
    class MyAsyncTask extends AsyncTask<String, Integer, ArrayList<Integer>> { 
     int route; 
     String direction; 
    ..... 
     @Override 
     protected ArrayList<Integer> doInBackground(String... params) { 

       ...... 
           Gson gson = new Gson(); 
       JSONStore data = gson.fromJson(sb.toString(), JSONStore.class); 

       route = data.getRoute(); 
       direction = data.getDirection(); 
    } 
     protected void onPostExecute(ArrayList<Integer> result) { 
          if (route != 0) { 
           String directRoute = direction + "," +Integer.toString(route);    
       Intent intent = new Intent(MainActivity.getAppContext(), MainActivity.class); 
       intent.putExtra("dirtRout", directRoute); 
     } 

    } 
} 

Answer 1

你沒有在創建意圖之後開始你的活動。從應用中獲取當前活動並調用startactivity方法。