Question

我有一个从空开始的gridview，然后当用户触摸一个按钮时，他们会在列表中添加一个“练习”，然后我会像这样通知gridview

Exercise e = new Exercise();
w.addExercise(e);
bwGVA.notifyDataSetChanged();

然后出现一个空的网格视图框，如果用户触摸它，则会出现一系列图像，并且它们触摸的图像将成为网格视图中的图像视图。但是，如果他们触摸按钮并向gridview添加另一个练习，那么deafult已经拥有相同的图像。它应该是空白的

但这不是我认为我的问题所在。以下是gridview适配器中的getview

public class BuildWorkoutGridViewAdapter extends BaseAdapter{

private static ArrayList<Exercise> ExerciseList;
Context c;

public BuildWorkoutGridViewAdapter(Context context, ArrayList<Exercise> _list) {
    c = context;
    ExerciseList = _list;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return ExerciseList.size();
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {

    View v;

    if(convertView == null){
        LayoutInflater li = (LayoutInflater) c
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        v = li.inflate(R.layout.build_exercise_view, null);


    }else{
        v = (View) convertView;
    }

    Exercise e = ExerciseList.get(position);

    TextView Reps = (TextView) v.findViewById(R.id.tvCustomReps);
    TextView Sets = (TextView) v.findViewById(R.id.tvCustomSets);
    ImageView ivThumbnail = (ImageView) v
            .findViewById(R.id.ivBuildWorkout_Thumbnail);

    if (e.getSets() != null) {
        Sets.setText(e.getSets().trim());
    }

    if (e.getReps() != null) {
        Reps.setText(e.getReps().trim());
    }

    if (e.getFilepath() != null) {
        System.out.println("filepath:" + e.getFilepath().trim());
        BitmapHelper BH = new BitmapHelper(c);
        BH.loadSingleBitmap("WorkoutImages/" + e.getFilepath().trim(),
                c, ivThumbnail);
        e.setImageStatus(true);
    }

    // TODO Auto-generated method stub
    return v;
}

@Override
public Exercise getItem(int position) {
    // TODO Auto-generated method stub
    return ExerciseList.get(position);
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}



}

我认为这与convertview有关。但我无法弄清楚出了什么问题。

Answer 1

使用ViewHolder模式进行平滑滚动和效果

http://developer.android.com/training/improving-layouts/smooth-scrolling.html

static class ViewHolder
{
TextView reps,Sets;
ImageView ivThumbnail;
}

将getView更改为

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder;

    if(convertView == null){
        LayoutInflater li = (LayoutInflater) c
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        convertView = li.inflate(R.layout.build_exercise_view, null);
        holder = new ViewHolder();
        holder.Reps = (TextView) convertView.findViewById(R.id.tvCustomReps);
        holder.Sets = (TextView) convertView.findViewById(R.id.tvCustomSets);
        holder.ivThumbnail = (ImageView) convertView.findViewById(R.id.ivBuildWorkout_Thumbnail);
        convertView.setTag(holder);

    }else{
       holder = (ViewHolder) convertView.getTag();
    }

    Exercise e = ExerciseList.get(position);

    if (e.getSets() != null) {
        holder.Sets.setText(e.getSets().trim());
    }

    if (e.getReps() != null) {
        holder.Reps.setText(e.getReps().trim());
    }

    if (e.getFilepath() != null) {
        System.out.println("filepath:" + e.getFilepath().trim());
        BitmapHelper BH = new BitmapHelper(c);
        BH.loadSingleBitmap("WorkoutImages/" + e.getFilepath().trim(),
                c, holder.ivThumbnail);
        e.setImageStatus(true);
    }
    return convertView;
}

如果您需要更新gridView更新基础数据，则填充gridView并调用适配器上的notifyDataSetChanged。

GridView正在混合图像

1 个答案: