Populate spinner with custom object

问题

I want to populate my Android spinner with data from a SQLite table. I already have the database controllers, and these are returning custom objects.

Now what I need to do is populate the spinner with this objects, in order to get not the string field, but the Id field. For example: My table Days, with fields Id and Day:

id - day 1 - Sunday

2 - Monday

3 - Tuesday...

And the Day object has two properties (id, and name)

I want the spinner to show "Monday", but internally, store the Id field '2' in an int variable, in order to query again the database with theese selected values.

I think I have to do it with an Adapter, but I don't know if I can do what I want with this controller.

I'd apreciate some order or advice to begin with.

Thanks

回答1:

You can use ArrayAdapter<T> to populate your spinner via the method setAdapter.

private List<MyData> data;
...
mySpinner.setAdapter<MyData>(new ArrayAdapter(getContext(), resId, data));
...

public class MyData {

     private int _id;
     public MyData(int id) {
         this._id = id;
     }

  @Override 
  public String toString() {
     switch (this._id) {
       ....
     }
   }
}

回答2:

You can do so with Custom Spinner. See this Design the spinner item separately in xml and use LayoutInflator.

回答3:

save: In the getView() of your Adapter use "setTag" method set the "Day object"

retrive:(onItemSelcted method of spinner) now by using getTag() method, get the "Day object" (Day object.getId() will return the int value)

回答4:

Finally I solved it following this tutorial.

http://adanware.blogspot.com.es/2012/03/android-using-spinner-with-custom.html

回答5:

in ArrayAdapter

@Override
public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    View v = super.getDropDownView(position, convertView, parent);
    if (position > 0) {
        ((TextView) v.findViewById(android.R.id.text1)).setText(list.get(position - 1).getName());
    }
    return v;
}

来源：https://stackoverflow.com/questions/29077135/populate-spinner-with-custom-object

标签

java

android

sqlite