Android 图像未在毕加索中显示，因为gridview

图像没有显示，应用程序正在启动，但没有图像显示，你能帮我解决这个问题吗？我猜gridimage有问题。请注意，列表视图中没有显示毕加索的占位符

public class GridViewAdapter extends ArrayAdapter<GridImages> {

    private Context mContext;
    private int layoutResourceId;
    private ArrayList<GridImages> mGridImages = new ArrayList<GridImages>();

    public GridViewAdapter(Context mContext, int layoutResourceId, ArrayList<GridImages> mGridImages) {
        super(mContext, layoutResourceId, mGridImages);
        this.layoutResourceId = layoutResourceId;
        this.mContext = mContext;
        this.mGridImages = mGridImages;
    }


    /**
     * Updates grid data and refresh grid items.
     * @param mGridData
     */
    public void setGridData(ArrayList<GridImages> mGridImages) {
        this.mGridImages = mGridImages;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null){

       LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
       convertView = inflater.inflate(layoutResourceId, parent, false);
        holder.imageView = (ImageView)convertView.findViewById(R.id.grid_item_image);
        holder.titleTextView = (TextView)convertView.findViewById(R.id.grid_item_title);
        convertView.setTag(holder);
}
    else{
        holder = (ViewHolder) convertView.getTag();
    }

String url = "http://www.justedhak.comlu.com/images/uploaded_images.jpg";

Picasso.with(mContext)
        .load(url)
        .placeholder(R.drawable.ic_launcher)
        .error(R.drawable.ic_launcher)
        .noFade().resize(150,150)
        .centerCrop()
        .into(holder.imageView);
return convertView;
}

    static class ViewHolder {
        TextView titleTextView;
        ImageView imageView;
    }
    }

这是主要活动

公共类MainActivity扩展了ActionBarActivity{

GridViewAdapter mGridAdapter;
private ArrayList<GridImages> mGridImages;
private ListView listView;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listView = (ListView) findViewById(R.id.list1);
    mGridImages = new ArrayList<>();

    mGridAdapter = new GridViewAdapter(this, R.layout.grid_item_layout, mGridImages);
    listView.setAdapter(mGridAdapter);


}

活动主体

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.justedhak.MainActivity" >


    <ListView
        android:id="@+id/list1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:columnWidth="100dp"
        android:drawSelectorOnTop="true"
        android:gravity="center"
        android:numColumns="auto_fit"
        android:stretchMode="columnWidth"
        android:verticalSpacing="5dp"
        android:focusable="true"
        android:clickable="true"/>  


</RelativeLayout>

网格项布局

    <ImageView
        android:id="@+id/grid_item_image"
        android:layout_width="500dp"
        android:layout_height="500dp"
      />

    <TextView
        android:id="@+id/grid_item_title"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:gravity="center"
        android:maxLines="2"
        android:layout_below="@+id/grid_item_image"
        android:ellipsize="marquee"
        android:textSize="12sp" />

</RelativeLayout>

检查一下你的布局。 尝试为“图像视图”设置特定高度，然后查看

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如果您没有成功添加布局代码。

检查我的答案@Blackbelt我现在就检查thanks@Blackbelt我读了你的答案，但仍然没有发现问题mgridimages是空的。@Blackbelt你是对的，所以我发布了这个问题，你能帮我吗？我已经编辑了我的问题，请检查一下