我想在gridview中显示图像，第一列中的图像占据两行

Question

ActivityMain.xml

<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/sdcard"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:columnWidth="70dp"
    android:gravity="center"
    android:horizontalSpacing="10dp"
    android:numColumns="auto_fit"
    android:padding="10dp"
    android:stretchMode="columnWidth"
    android:verticalSpacing="10dp" />

MainActivity.java

package com.example.gridlistview;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
/**
* Displays images from an SD card.
*/
public class MainActivity extends Activity {

/**
* Cursor used to access the results from querying for images on the SD card.
*/
    private Cursor cursor;
/*
* Column index for the Thumbnails Image IDs.
*/
    private int columnIndex;

@SuppressWarnings("deprecation")
@Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Set up an array of the Thumbnail Image ID column we want
        String[] projection = {MediaStore.Images.Thumbnails._ID};
//      Create the cursor pointing to the SDCard
        cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
                                projection, // Which columns to return
                                null,       // Return all rows
                                null,
                                MediaStore.Images.Thumbnails.IMAGE_ID);
//      Get the column index of the Thumbnails Image ID
        columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);

        GridView sdcardImages = (GridView) findViewById(R.id.sdcard);
        sdcardImages.setAdapter(new ImageAdapter(this));

//  Set up a click listener
        sdcardImages.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) 
            {
//  Get the data location of the image
                String[] projection = {MediaStore.Images.Media.DATA};
                cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                                    projection, // Which columns to return
                                    null,       // Return all rows
                                    null,
                                    null);
                columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToPosition(position);
//      Get image filename
                String imagePath = cursor.getString(columnIndex);
//      Use this path to do further processing, i.e. full screen display
            } });
    }

/**
* Adapter for our image files.
*/
    private class ImageAdapter extends BaseAdapter 
    {

        private Context context;
        public ImageAdapter(Context localContext) 
        {
            context = localContext;
        }
        public int getCount() 
        {
            return cursor.getCount();
        }
        public Object getItem(int position) 
        {
            return position;
        }
        public long getItemId(int position) 
        {
            return position;
        }
        public View getView(int position, View convertView, ViewGroup parent) 
        {
            ImageView picturesView;
            if (convertView == null)
            {

                picturesView = new ImageView(context);
                // Move cursor to current position
                cursor.moveToPosition(position);
//  Get the current value for the requested column
                int imageID = cursor.getInt(columnIndex);
                // Set the content of the image based on the provided URI
                picturesView.setImageURI(Uri.withAppendedPath(
                                        MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID));
                if(position%3 == 0)
                {
                    picturesView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                    picturesView.setPadding(10,0,0,0);
                    picturesView.setLayoutParams(new GridView.LayoutParams(150,300));
                }
                else
                {
                    picturesView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                    picturesView.setPadding(0,0,0,0);
                    picturesView.setLayoutParams(new GridView.LayoutParams(70,70));
                }
            }
            else 
            {
                picturesView = (ImageView)convertView;
            }
            return picturesView;
        }
    }
}

我想在gridview中显示图像

第一列的高度和宽度与其他两列不同

。怎么做 。我是android编程的新手