CallbackExample

CallbackExample.java

public class CallbackExample {
  public interface OnNetworkFinish{
    void OnFinish(String Data);
    void OnFail();
  }
  
  class GetGoogleData{
    List<OnNetworkFinish> mListener;
    
    void getGoogleTitle(){
      new Thread(new Runnable(){
        
        @Overwrite
        void run(){
          try{
            
            //do something to get network date on nonuithread;
            ...
            String data = something;
            //when finish ,callback
            if (mListener!=null){
              for (OnNetworkFinish listener:mListener)
                listener.OnFinish(data);
            }
          }catch (Exception e){
            if (mListener!=null){
              for (OnNetworkFinish listener:mListener)
                listener.OnFail();
            }
          }
        }
        
      }).start;
    }
    
    void setListener(OnNetworkFinish listener){
      if (mListener==null){
        mListener = new ArrayList<OnNetworkFinish>();
      }
      mListener.add(listener);
    }
  }
  
  GetGoogleData mGetGoogleData;
  
  int main(){
    mGetGoogleData = new GetGoogleData();
    mGetGoogleData.setListener(new OnNetworkFinish{
      
      void OnFinish(String Data){
        //this will be call when nonuithread work finish.
        //do something to data...
      }
      
      void OnFail(){
        //do something when get error
      }
    });
    
    mGetGoogleData.getGoogleTitle();
  }
  
  
  void otherNeed2Notify(){
    mGetGoogleData.setListener(new OnNetworkFinish{
      
      void OnFinish(String Data){
        //I'm other place.
      }
      
      void OnFail(){
        
      }
    });
  }
  
}