我一直在创建图像的网格视图,图像存在于Assets文件夹中.
Opening a File from assets folder in android链接帮助我使用位图来读取它.目前的代码是：
public View getView(final int position,View convertView,ViewGroup parent)
{
try
{
AssetManager am = mContext.getAssets();
String list[] = am.list("");
int count_files = imagelist.length;
for(int i= 0;i<=count_files; i++)
{
BufferedInputStream buf = new BufferedInputStream(am.open(list[i]));
Bitmap bitmap = BitmapFactory.decodeStream(buf);
imageView.setImageBitmap(bitmap);
buf.close();
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
我的应用程序从Assets文件夹中读取图像,但它不是遍历网格视图中的单元格.网格视图的所有单元格具有从图像集中选取的相同图像.任何人都可以告诉我如何迭代单元格,仍然有不同的图像？
我在ImageAdapter类中有上述代码,它扩展了BaseAdapter类,在我的主类中,我将其与gridview进行链接：
GridView gv =(GridView)findViewById(R.id.gridview);
gv.setAdapter(new ImageAdapter(this,assetlist));
非常感谢任何帮助提前,
萨兰
解决方法
下面的Saran是我用来在图库的资源文件夹中显示图像的.我想像一个gridview是一样的：
public class myActivitye extends Activity
{
private Gallery mGallery;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mGallery = (Gallery) findViewById(R.id.mygalleryinxml);
//load images into memory
mBitArray = new Bitmap[4];
try
{
//these images are stored in the root of "assets"
mBitArray[0] = getBitmapFromAsset("pic1.png");
mBitArray[1] = getBitmapFromAsset("pic2.png");
mBitArray[2] = getBitmapFromAsset("pic3.png");
mBitArray[3] = getBitmapFromAsset("pic4.png");
}
catch (IOException e)
{
e.printStackTrace();
}
mGallery.setAdapter(new GalleryAdapter(this,mBitArray));
}
public class GalleryAdapter extends BaseAdapter
{
//member variables
private Context mContext;
private Bitmap[] mImageArray;
//constructor
public GalleryAdapter(Context context,Bitmap[] imgArray)
{
mContext = context;
mImageArray = imgArray;
}
public int getCount()
{
return mImageArray.length;
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
//returns the individual images to the widget as it requires them
public View getView(int position,ViewGroup parent)
{
final ImageView imgView = new ImageView(mContext);
imgView.setImageBitmap(mImageArray[position]);
//put black borders around the image
final RelativeLayout borderImg = new RelativeLayout(mContext);
borderImg.setPadding(20,20,20);
borderImg.setBackgroundColor(0xff000000);//black
borderImg.addView(imgView);
return borderImg;
}
}//end of: class GalleryAdapter
/**
* Helper Functions
* @throws IOException
*/
private Bitmap getBitmapFromAsset(String strName) throws IOException
{
AssetManager assetManager = getAssets();
InputStream istr = assetManager.open(strName);
Bitmap bitmap = BitmapFactory.decodeStream(istr);
istr.close();
return bitmap;
}
}
