Question

我想在android中使用gridview显示不同的图像？ Xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical"
android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >

<GridView android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
 android:columnWidth="90dp"
android:stretchMode="columnWidth"
android:gravity="center" />

</LinearLayout>

Android [Java代码]：

public class Backgroundimage extends Activity
     {
    public void onCreate(Bundle savedInstanceState)
        {
           super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

    GridView gridview = (GridView) findViewById(R.id.gridview);
     gridview.setAdapter(new ImageAdapter(this));
          }

    public class ImageAdapter extends BaseAdapter
                  {
    private Context mContext;
    public ImageAdapter(Context c)
           {
               mContext = c;
          }

      public int getCount()
        {
        return mThumbIds.length;
        }

    public Object getItem(int position)
          { 
       return null;
            }

    public long getItemId(int position)
    {
    return 0;
     }
    // create a new ImageView for each item referenced by the Adapter
 public View getView(int position, View convertView, ViewGroup parent)
    {
    ImageView imageView;
                                                    if (convertView == null)
    {
     imageView = new ImageView(mContext);
    imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
    imageView.setPadding(6, 6, 6, 6);
    }
    else
    {
    imageView = (ImageView) convertView;
     }
    imageView.setImageResource(R.drawable.image1);
      return imageView;
                                    }
    private Integer[] mThumbIds = {
            R.drawable.image1, R.drawable.image2,
            R.drawable.image3, R.drawable.image4,
                       };
    }   


}

但是image1出现在所有位置，就像这个图像出现在行和列的网格视图中一样。但是没有显示其他图像。如何解决这个问题？

Answer 1

尝试更改您的代码，如下所示： - （标有/* */的更改）

public class Backgroundimage extends Activity{

    public void onCreate(Bundle savedInstanceState){

      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

     GridView gridview = (GridView) findViewById(R.id.gridview);
     gridview.setAdapter(new ImageAdapter(this));
   }

 public class ImageAdapter extends BaseAdapter{

    private Context mContext;

    public ImageAdapter(Context c){
        mContext = c;
    }

    public int getCount(){
      return mThumbIds.length;
    }

    public Object getItem(int position){ 
       return null;
    }

    public long getItemId(int position){
       return 0;
    }

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

     ImageView imageView;
     if (convertView == null){
      imageView = new ImageView(mContext);
      imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
      imageView.setPadding(6, 6, 6, 6);
    }else{
     imageView = (ImageView) convertView;
    }
    /* Change Here in your code  */
    imageView.setImageResource(mThumbIds[position]);

   return imageView;
}

private Integer[] mThumbIds = {
            R.drawable.image1, R.drawable.image2,
            R.drawable.image3, R.drawable.image4};
    } 
}

Answer 2

更改此行

imageView.setImageResource(R.drawable.image1);

添加此项而非

 imageView.setImageResource(mThumbIds[position]);

Answer 3

它简单的兄弟......

public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView;
                                                if (convertView == null)
{
 imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(6, 6, 6, 6);
}
else
{
imageView = (ImageView) convertView;
 }
imageView.setImageResource(R.drawable.image1);         
  return imageView;

}

在上面的代码更改

 imageView.setImageResource(R.drawable.image1);

到

 imageView.setImageResource(mThumbIds[position]);

并确保在mThumbs数组中添加您想要Gridview的子元素

的元素数量

第二个疑问 在这一行之后 GridView gridview =（GridView）findViewById（R.id.gridview）; 使用这个

gritview.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View imageview, int pos,
                long arg3) {
            // TODO Auto-generated method stub

        }
    });

如何在网格视图中设置不同的图像？

3 个答案: