直接看代碼吧:
public class RecommendViewPageAdapter extends PagerAdapter {
public static final String TAG = "RecommendViewPageAdapter";
private Context mContext;
private List<TopicModel> mTopicModels;
private List<ViewHolder> mViewHolderList = new ArrayList<>();
public RecommendViewPageAdapter(Context context, List<TopicModel> models) {
mContext = context;
mTopicModels = models;
}
@Override
public int getCount() {
return mTopicModels.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ViewHolder) object).itemView;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
final ViewHolder viewHolder;
if (mViewHolderList.size() > 0) {
viewHolder = mViewHolderList.get(0);
mViewHolderList.remove(0);
} else {
final View item = LayoutInflater.from(mContext).inflate(R.layout.recommend_view_pager_item, null);
viewHolder = new ViewHolder(item);
}
final TopicModel headerTopic = mTopicModels.get(position);
viewHolder.mCoverImg.setImageURI(headerTopic.getBigCoverUri());
viewHolder.mTitleTxt.setText(headerTopic.getTitle());
viewHolder.mRankingTxt.setText(mContext.getResources().getString(R.string.ranking_count, headerTopic.getArticleNum()));
viewHolder.mFollowTxt.setText(mContext.getResources().getString(R.string.followed, headerTopic.getFollowUserNum()));
viewHolder.mTagsLinearLayout.removeAllViews();
for (int i = 0, z = headerTopic.getTagModelList().size(); i < z; i++) {
TextView tagTxtView = TagViewUtil.getTagTxtView(mContext);
// tagTxtView.setText("標籤");
int padding = mContext.getResources().getDimensionPixelOffset(R.dimen.item_padding_micro);
int autoPadding = AutoUtils.scaleValue(padding);
AutoWrapLinearLayout.LayoutParams layoutParams = new AutoWrapLinearLayout.LayoutParams(autoPadding, autoPadding);
tagTxtView.setText(headerTopic.getTagModelList().get(i).getTag());
viewHolder.mTagsLinearLayout.addView(tagTxtView, layoutParams);
}
container.addView(viewHolder.itemView, -1, null);
if (mOnItemClickListener != null) {
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mOnItemClickListener.onClick(viewHolder.itemView, headerTopic, position);
}
});
}
return viewHolder;
}
public static class ViewHolder {
public View itemView;
@Bind(R.id.img_cover)
SimpleDraweeView mCoverImg;
@Bind(R.id.txt_title)
TextView mTitleTxt;
@Bind(R.id.tags_box)
AutoWrapLinearLayout mTagsLinearLayout;
@Bind(R.id.txt_ranking)
TextView mRankingTxt;
@Bind(R.id.txt_follow)
TextView mFollowTxt;
public ViewHolder(View itemView) {
this.itemView = itemView;
ButterKnife.bind(this, itemView);
}
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
LogUtil.d(TAG, "destroyItem position = " + position + " , obj = " + object);
ViewHolder viewHolder = (ViewHolder) object;
(container).removeView(viewHolder.itemView);
mViewHolderList.add(viewHolder);
container.removeView(viewHolder.itemView);
}
OnItemClickListener mOnItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
mOnItemClickListener = onItemClickListener;
}
public interface OnItemClickListener {
void onClick(View view, TopicModel headerTopic, int position);
}
}