The necessary interface callback usage in Android

1, this method is very common, I think it is very practical, share it

public class Dirverdistancetool {
public void Getdirverdistance (latlng start, latlng end,final Ondirverdistancelistener ondirverdistancelistener) {
Routeplansearch Msearch = Routeplansearch.Newinstance ();
Msearch.setongetrouteplanresultlistener (New Ongetrouteplanresultlistener () {
Private Drivingrouteline Route;

public void Ongetwalkingrouteresult (Walkingrouteresult result) {}//Get the pedestrian route planning results

public void Ongettransitrouteresult (Transitrouteresult result) {}//Get bus transfer Path planning results

@Override
public void Ongetmasstransitrouteresult (Masstransitrouteresult masstransitrouteresult) {}

public void Ongetdrivingrouteresult (Drivingrouteresult result) {
if (Result.error = = Searchresult.errorno.No_error && NULL! = result && Null! = Result.getroutelines () && result.getroutelines (). Size () ; 0) {
int distance = Result.getroutelines (). Get (0). Getdistance ();
BigDecimal BigDecimal = new BigDecimal (Double.ValueOf (distance)/1000);
if (null! = Ondirverdistancelistener) Ondirverdistancelistener.dirverdistancelistener (Bigdecimal.setscale (1, BigDecimal.ROUND_HALF_UP). Doublevalue ());
}else{
System.out.println ("=============> Sorry, Span style= "font-family:" Arial "" Not calculated driving distance ... "); 
 if (null! = Ondirverdistancelistener) Ondirverdistancelistener.dirverdistancelistener (null); 
} 
}// Get driving route planning results 
  
  @Override 
 public void Ongetindoorrouteresult (Indoorrouteresult Indoorrouteresult) {} 
 
 @Override 
 public void Ongetbikingrouteresult (Bikingrouteresult bikingrouteresult) { } 
}); 
 Msearch.drivingsearch (New Drivingrouteplanoption ()). From (Plannode. Withlocation (Start)). to (Plannode. Withlocation (end))); 
} 
 
 public interface ondirverdistancelistener{
 void Dirverdistancelistener (Double RETURNKM); 
} 
} 
 
        Analysis:
This method is an interface callback socket callback, used to handle the management code, so that the code more layered sense

Routeplansearch Msearch = Routeplansearch.newinstance (); 
In aOngetwalkingrouteresult();Ongettransitrouteresult ();
 　　　　　　　　　　　　　　　　　　  Ongetmasstransitrouteresult ();Ongetdrivingrouteresult()
 　　　　　　　　　　　　　　　　　　 Ongetindoorrouteresult();Ongetbikingrouteresult();
There are six methods if you put in a class will make the code very bloated, through the interface callback can solve this problem.

Write an interface that throws the Dirverdistancelistener () into the use class

public interface ondirverdistancelistener{
    void Dirverdistancelistener (Double RETURNKM);


In the class used directly new, get the return of the RETURNKM,

(New Dirverdistancetool ()). Getdirverdistance (Start, End, new Dirverdistancetool.ondirverdistancelistener () {
@Override
public void Dirverdistancelistener (Double returnkm) {
if (null! = Deliveryprice && null! = RETURNKM &&!) Textutils.IsEmpty (minimun)) {
RETURNKM = RETURNKM;
Price = Deliveryprice * RETURNKM * (isweighthundred? Integer. valueOf (minimun): Textutils. IsEmpty (Other_t.gettext (). toString ())? 0:double. parsedouble (Other_t.gettext (). toString (). Replace (" ton", "")));
if (null! = Price)
Delivery_price_text.settext ((Price > 0)? "￥" + dubstring. keepprecision (Price + "", 2): "0.00");
}//end of If
}
});

2. This method is basic usage
Defining interfaces
Public interface Callbackgetaddress {
    public void Editlistener (int position);
    public void Deletelistener (int position);
}

By constructing a method to pass

Private Callbackgetaddress CallBack;

Public Addressadapter (context context, callbackgetaddress CallBack) {
    This.context = context;
    This.callback = CallBack;
}

Using callbacks

Vh.tvEdit.setOnClickListener (New View.onclicklistener () {
@Override
public void OnClick (view view) {
Callback.editlistener (i);
}
});

use direct implements addressadapter.callbackgetaddress in a class
rewrite
@Override
public void Editlistener (int position) {
Beanadresslist.address Address = list.get (position);
Bundle bundle = new bundle ();
Bundle.putserializable (adresseditactivity.  Adressdetail, address);
Stephentoolutils. startactivitynofinish (activity, Adresseditactivity.class, Bundle, Url.  editadress);
}

3. The third method of implementation, similar to the second one, is implemented by activity, which is relatively simple and rough
declaration Method

Private final publishactivity publishactivity;

Public Expadnableadapter (publishactivity publishactivity) {
    this.publishactivity = publishactivity;
}


Put the method back in the past

Publishactivity.changeexpandablelistshow (Groupposition, isexpanded);


Use in activity

public void Changegroupprice (int groupposition, float price) {// sets whether the parent is edited, whether there are prices
    Purchase_type.get (groupposition). Setediting (false);
    Purchase_type.get (groupposition). Setcurprice (price);
}

Very practical, summary of individual projects

The necessary interface callback usage in Android