package quickutils.core.adapters;
// Apache 2.0 licensed.
/**
* An adapter base class that uses a new/bind pattern for its views.
* https://gist.github.com/JakeWharton/5423616
*/
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
/** An implementation of {@link BaseAdapter} which uses the new/bind pattern for its views. */
public abstract class BindableAdapter<T> extends BaseAdapter {
private final Context context;
private final LayoutInflater inflater;
public BindableAdapter(Context context) {
this.context = context;
this.inflater = LayoutInflater.from(context);
}
public Context getContext() {
return context;
}
@Override public abstract T getItem(int position);
@Override public final View getView(int position, View view, ViewGroup container) {
if (view == null) {
view = newView(inflater, position, container);
if (view == null) {
throw new IllegalStateException("newView result must not be null.");
}
}
bindView(getItem(position), position, view);
return view;
}
/** Create a new instance of a view for the specified position. */
public abstract View newView(LayoutInflater inflater, int position, ViewGroup container);
/** Bind the data for the specified {@code position} to the view. */
public abstract void bindView(T item, int position, View view);
@Override public final View getDropDownView(int position, View view, ViewGroup container) {
if (view == null) {
view = newDropDownView(inflater, position, container);
if (view == null) {
throw new IllegalStateException("newDropDownView result must not be null.");
}
}
bindDropDownView(getItem(position), position, view);
return view;
}
/** Create a new instance of a drop-down view for the specified position. */
public View newDropDownView(LayoutInflater inflater, int position, ViewGroup container) {
return newView(inflater, position, container);
}
/** Bind the data for the specified {@code position} to the drop-down view. */
public void bindDropDownView(T item, int position, View view) {
bindView(item, position, view);
}
}