MasterSpinner.java

import android.annotation.SuppressLint;
import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * @author Brian Salvattore
 */
@SuppressWarnings("unused")
@SuppressLint("AppCompatCustomView")
public class MasterSpinner extends Spinner {

    private ArrayList<HashMap<String, String>> array;
    private List<String> descriptions;

    //region Constructor
    public MasterSpinner(Context context) {
        super(context);
        init();
    }

    public MasterSpinner(Context context, int mode) {
        super(context, mode);
        init();
    }

    public MasterSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MasterSpinner(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    public MasterSpinner(Context context, AttributeSet attrs, int defStyleAttr, int mode) {
        super(context, attrs, defStyleAttr, mode);
        init();
    }
    //endregion

    private void init() {
        setEnabled(false);
        setAdapter(new ArrayList<>() , "Seleccione una opción");
    }

    @SuppressWarnings("Convert2streamapi")
    public void setOnItemSelectedListener(@Nullable OnItemSelectedListener listener) {
        if (array == null) throw new NullPointerException("spinner adapter is null");

        setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @SuppressWarnings("ConstantConditions")
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                if (i != descriptions.size()) {

                    String description = descriptions.get(i);

                    for (HashMap<String, String> item : array) {

                        if (description.equals(item.get("description"))) {
                            listener.onItemSelected(item);
                            return;
                        }
                    }
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
    }

    @Override
    public HashMap<String, String> getSelectedItem() {
        return getSelectedItemPosition() == array.size() ?  new HashMap<>() : array.get(getSelectedItemPosition());
    }

    public String getSelectedDescription() {
     return getSelectedItem().get("description") == null ? "" : getSelectedItem().get("description");
    }

    public void setAdapter(String method) {
        setAdapter(method, "Seleccione una opción");
    }

    public void setAdapter(ArrayList<HashMap<String, String>> array) {
        setAdapter(array, "Seleccione una opción");
    }

    @SuppressWarnings("Convert2streamapi")
    public void setAdapter(ArrayList<HashMap<String, String>> array, String hint) {
        this.array = array;

        List<String> descriptions = new ArrayList<>();

        for (HashMap<String, String> item : array) {
            descriptions.add(item.get("description"));
        }

        descriptions.add(hint);
        this.descriptions = descriptions;

        DefaultArrayAdapter adapter = new DefaultArrayAdapter<>(getContext(), descriptions);

        setAdapter(adapter);
        setEnabled(array.size() != 0);
        setSelection(descriptions.size() == 1 ? 0 : adapter.getCount());
    }

    public void setArray(ArrayList<HashMap<String, String>> array) {
        this.array = array;
    }

    public ArrayList<HashMap<String, String>> getArray() {
        return array;
    }

    @SuppressWarnings("Convert2streamapi")
    public void setSelection(String description) {
        if (description != null) {
            for (int i = 0; i < array.size(); i++) {
                HashMap<String, String> item = array.get(i);
                if (description.equals(item.get("description"))) {
                    setSelection(i);
                    return;
                }
            }
        }
    }

    public interface OnItemSelectedListener {
        void onItemSelected(HashMap<String, String> item);
    }

    public static class DefaultArrayAdapter<T> extends ArrayAdapter<T> {

        public DefaultArrayAdapter(Context context, List<T> objects) {
            super(context, android.R.layout.simple_spinner_dropdown_item, objects);
        }

        @Override
        public int getCount() {
            int count = super.getCount();
            return count == 1 ? count : count - 1;
        }
    }

    //region go to top
    private boolean toggleFlag = true;

    @Override
    public int getSelectedItemPosition() {
        if (!toggleFlag) return 0;
        return super.getSelectedItemPosition();
    }

    @Override
    public boolean performClick() {
        toggleFlag = false;
        boolean result = super.performClick();
        toggleFlag = true;
        return result;
    }
    //endregion
}