我试图创建一个图标的Gridview,Imageview设置为两个图像中的一个,如下例所示:
我从sqlite内容提供商处检索两个值,一个用于邮票数量,另一个用于最大邮票数量。
我使用具有视图持有者模式的自定义适配器,因此我尝试在片段中设置模型onLoadFinished()。我目前尝试的模型是int [],其值为0或1,以确定是使用绿色印记还是灰色。但是,由于GridView中没有显示任何内容,因此无法正常工作。
这里是来自片段的onLoadFinished()的代码片段:
imageSourceModel = new int[data.getInt(data.getColumnIndex(RewardsEntry.COLUMN_REW_MAX_POINTS))];
int i = data.getInt(data.getColumnIndex(RewardsEntry.COLUMN_REW_POINTS));
for (int j = 0; j < imageSourceModel.length; j++, i--) {
if (i > 0) {
imageSourceModel[j] = 1;
} else {
imageSourceModel[j] = 0;
}
}
stampGridAdapter.setModel(imageSourceModel);
以及自定义适配器的代码:
@Override
public View getView(int i, View view, ViewGroup parent) {
ViewHolder viewHolder;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_item_discover, parent, false);
viewHolder = new ViewHolder(view);
view.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) view.getTag();
}
if (model[i] > 0) {
viewHolder.stampView.setImageResource(R.drawable.ic_approved_stamp);
} else {
viewHolder.stampView.setImageResource(R.drawable.ic_approved_stamp_disabled);
}
return view;
}
简单的ViewHolder:
private class ViewHolder {
public ImageView stampView;
public ViewHolder(View view) {
stampView = (ImageView) view.findViewById(R.id.grid_stamp_image);
}
}
如果我不得不猜测,我会说它因为创建顺序而失败,因此在onLoadFinished()传入模型之前完成了getView()。我只是不确定如何解决这个问题或者我可以使用的其他方法。任何帮助表示赞赏。
答案 0 :(得分:1)
对于你想要实现的目标,这对我来说似乎不必要,尤其是双变量循环。简单地说,我只是这样做:
onLoadFinished()中的
int maxPoints = data.getInt(data.getColumnIndex(RewardsEntry.COLUMN_REW_MAX_POINTS));
int currentPoints = data.getInt(data.getColumnIndex(RewardsEntry.COLUMN_REW_POINTS));
mGridView.setAdapter(new RewardPointAdapter(getActivity(), currentPoints, maxPoints);
您的适配器可能如下所示:
public class RewardPointAdapter extends BaseAdapter {
private LayoutInflater mLayoutInflater;
private int mMaxRewardPoints;
private int mCurrentRewardPoints;
public RewardPointAdapter(Context context, int currentRewardPoints, int maxRewardPoints) {
mLayoutInflater = LayoutInflater.from(context);
mMaxRewardPoints = maxRewardPoints;
mCurrentRewardPoints = currentRewardPoints;
}
@Override
public int getCount() {
return mMaxRewardPoints;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = mLayoutInflater.inflate(R.layout.list_item_discover, parent, false);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
if (position < mCurrentRewardPoints) {
viewHolder.stampView.setImageResource(R.drawable.ic_approved_stamp);
} else {
viewHolder.stampView.setImageResource(R.drawable.ic_approved_stamp_disabled);
}
return convertView;
}
private class ViewHolder {
public ImageView stampView;
public ViewHolder(View view) {
stampView = (ImageView) view.findViewById(R.id.grid_stamp_image);
}
}
}