我有一个允许下载 3 张图像并将它们显示到画廊中的应用程序为了做到这一点，我使用一个线程来下载图像和一个处理程序以便将图像放入画廊
问题是图像没有显示（图像视图为空）到画廊中（即使我看到我的 3 个图像的 3 个图像视图）
我不知道这是因为连接很慢（我在手机上开发）还是因为在下载图像之前显示了ui
非常感谢您的帮助
public class ChoiceLanguage extends Activity {
private TextView nomLangue;
private ArrayList<Language> listeLangues;
private ArrayList<String> listImages;
private Gallery gallery;
private String URL="******************";
private Drawable mNoImage;
Bitmap bitmap;
ImageView imgView = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.choice_language);
listeLangues= getIntent().getParcelableArrayListExtra("listeLangues");
listImages=buildListImages();
gallery = (Gallery) findViewById(R.id.galleryImg);
gallery.setAdapter(new AddImgAdp(this));
gallery.setSpacing(10);
gallery.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
System.out.println("URL "+ listImages.get(position) );
}
});
}
private InputStream openHttpConnection(String urlString) throws IOException {
InputStream in = null;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
conn.connect();
in=conn.getInputStream();
return in;
}
private Bitmap downloadImage( ImageView iView, String url) {
Bitmap bitmap = null;
InputStream in = null;
BufferedInputStream bis ;
try {
in = openHttpConnection(url);
bis= new BufferedInputStream(in, 8192);
bitmap = BitmapFactory.decodeStream(bis);
bis.close();
in.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return bitmap;
}
private ArrayList<String> buildListImages() {
ArrayList<String> listImg = new ArrayList<String>();
for(Language l : listeLangues) {
listImg.add(URL+l.getImagePath());
}
return listImg;
}
public class AddImgAdp extends BaseAdapter {
int GalItemBg;
private Context cont;
public AddImgAdp(Context c) {
cont = c;
TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
typArray.recycle();
}
public int getCount() {
return listImages.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
imgView = new ImageView(cont);
} else {
imgView = (ImageView)convertView;
}
ThreadDownload progressDl= new ThreadDownload(position);
progressDl.start();
imgView.setLayoutParams(new Gallery.LayoutParams(150, 150));
imgView.setScaleType(ImageView.ScaleType.FIT_XY);
imgView.setBackgroundResource(GalItemBg);
return imgView;
}
}
private class SetImg extends Handler {
public void handleMessage(Message msg) {
imgView.setImageBitmap(bitmap);
}
}
private class ThreadDownload extends Thread {
SetImg img= new SetImg();
int position ;
public ThreadDownload(int position)
{
super();
this.position=position;
}
public void run() {
bitmap = downloadImage(imgView,listImages.get(position));
img.sendEmptyMessage(0);
}
}
}