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Rexee/SpinnerCommon.java

Last active April 25, 2016 15:50
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Easy spinner arrays management
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SpinnerCommon.java
public class SpinnerCommon<T> {
public Spinner mSpinner;
public SpinnerAdapter<T> mAdapter;
public SpinnerCommon(Spinner spinner) {
this(spinner, new ArrayList<T>(), new SpinnerAdapter<T>() {
}, false, android.R.layout.simple_spinner_item, android.R.layout.simple_spinner_dropdown_item);
}
public SpinnerCommon(Spinner spinner, List<T> objects) {
this(spinner, objects, new SpinnerAdapter<T>() {
}, false, android.R.layout.simple_spinner_item, android.R.layout.simple_spinner_dropdown_item);
}
public SpinnerCommon(Spinner spinner, List<T> objects, SpinnerAdapter<T> adapter) {
this(spinner, objects, adapter, false, android.R.layout.simple_spinner_item, android.R.layout.simple_spinner_dropdown_item);
}
public SpinnerCommon(Spinner spinner, List<T> objects, SpinnerAdapter<T> adapter, boolean hasHint) {
this(spinner, objects, adapter, hasHint, android.R.layout.simple_spinner_item, android.R.layout.simple_spinner_dropdown_item);
}
public SpinnerCommon(Spinner spinner, ArrayList<T> objects, boolean hasHint, @LayoutRes int resourceId, @LayoutRes int dropDownResourceId) {
this(spinner, objects, new SpinnerAdapter<T>() {
}, hasHint, resourceId, dropDownResourceId);
}
public SpinnerCommon(Spinner spinner, List<T> objects, SpinnerAdapter<T> adapter, boolean hasHint, @LayoutRes int resourceId, @LayoutRes int dropDownResourceId) {
mSpinner = spinner;
mAdapter = adapter;
mAdapter.setObjects(objects);
mAdapter.setResource(resourceId);
mAdapter.setHasHint(hasHint);
mAdapter.setDropDownViewResource(dropDownResourceId);
mAdapter.setInflater(LayoutInflater.from(spinner.getContext()));
mSpinner.setAdapter(mAdapter);
}
public T getItem(int position) {
return mAdapter.getItem(position);
}
public void add(T object) {
mAdapter.add(object);
}
public void clear() {
mAdapter.clear();
}
public static abstract class SpinnerAdapter<TT> extends BaseAdapter {
private final Object mLock = new Object();
private LayoutInflater mInflater;
private List<TT> mObjects;
private int mDropDownResource;
private int mResource;
private boolean hasHint;
private int mFieldId = 0;
public void add(TT object) {
synchronized (mLock) {
mObjects.add(object);
}
notifyDataSetChanged();
}
public void clear() {
synchronized (mLock) {
mObjects.clear();
}
notifyDataSetChanged();
}
public void setFieldId(int fieldId) {
this.mFieldId = mFieldId;
}
public void setHasHint(boolean hasHint) {
this.hasHint = hasHint;
}
public long getItemId(int position) {
return position;
}
public TT getItem(int position) {
return mObjects.get(position);
}
public String getItemRepresentation(int position) {
return mObjects.get(position).toString();
}
public int getCount() {
return mObjects.size() - (hasHint ? 1 : 0);
}
public void setResource(@LayoutRes int mResource) {
this.mResource = mResource;
}
public void setInflater(LayoutInflater mInflater) {
this.mInflater = mInflater;
}
public void setObjects(List<TT> mObjects) {
this.mObjects = mObjects;
}
public void setDropDownViewResource(@LayoutRes int resource) {
this.mDropDownResource = resource;
}
public View getView(int position, View convertView, ViewGroup parent) {
return createViewFromResource(mInflater, position, convertView, parent, mResource);
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return createViewFromResource(mInflater, position, convertView, parent, mDropDownResource);
}
private View createViewFromResource(LayoutInflater inflater, int position, View convertView, ViewGroup parent, int resource) {
View view;
TextView text;
if (convertView == null) {
view = inflater.inflate(resource, parent, false);
} else {
view = convertView;
}
try {
if (mFieldId == 0) {
// If no custom field is assigned, assume the whole resource is a TextView
text = (TextView) view;
} else {
// Otherwise, find the TextView field within the layout
text = (TextView) view.findViewById(mFieldId);
}
} catch (ClassCastException e) {
Log.e("ArrayAdapter", "You must supply a resource ID for a TextView");
throw new IllegalStateException("ArrayAdapter requires the resource ID to be a TextView", e);
}
String item = getItemRepresentation(position);
text.setText(item);
return view;
}
}
@Rexee
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Rexee commented Apr 25, 2016

How to use:
New adapter:

SpinnerCommon<MyObject> adapter = new SpinnerCommon<>(spinnerUI, itemsList, new DropDownAdapter());

private class DropDownAdapter extends SpinnerCommon.SpinnerAdapter<MyObject> {
        @Override
        public String getItemRepresentation(int position) {
            return super.getItem(position).getTitle();
        }
    }

Get item from adapter:

MyObject item = adapter.getItem(position);

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