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IconHeaderItemPresenter.java
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IconHeaderItemPresenter.java
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package com.corochann.androidtvapptutorial.ui.presenter;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v17.leanback.widget.ListRow;
import android.support.v17.leanback.widget.Presenter;
import android.support.v17.leanback.widget.RowHeaderPresenter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.corochann.androidtvapptutorial.R;
import com.corochann.androidtvapptutorial.model.IconHeaderItem;
/**
* Customized HeaderItem Presenter to show {@link IconHeaderItem}
*/
public class IconHeaderItemPresenter extends RowHeaderPresenter {
private static final String TAG = IconHeaderItemPresenter.class.getSimpleName();
private float mUnselectedAlpha;
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup) {
mUnselectedAlpha = viewGroup.getResources()
.getFraction(R.fraction.lb_browse_header_unselect_alpha, 1, 1);
LayoutInflater inflater = (LayoutInflater) viewGroup.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.icon_header_item, null);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object o) {
IconHeaderItem iconHeaderItem = (IconHeaderItem) ((ListRow) o).getHeaderItem();
View rootView = viewHolder.view;
ImageView iconView = (ImageView) rootView.findViewById(R.id.header_icon);
int iconResId = iconHeaderItem.getIconResId();
if( iconResId != IconHeaderItem.ICON_NONE) { // Show icon only when it is set.
Drawable icon = rootView.getResources().getDrawable(iconResId, null);
iconView.setImageDrawable(icon);
}
TextView label = (TextView) rootView.findViewById(R.id.header_label);
label.setText(iconHeaderItem.getName());
}
@Override
public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {
// no op
}
// TODO: TEMP - remove me when leanback onCreateViewHolder no longer sets the mUnselectAlpha,AND
// also assumes the xml inflation will return a RowHeaderView
@Override
protected void onSelectLevelChanged(RowHeaderPresenter.ViewHolder holder) {
// this is a temporary fix
holder.view.setAlpha(mUnselectedAlpha + holder.getSelectLevel() *
(1.0f - mUnselectedAlpha));
}
}