我正在尝试使用通用图像加载器从 flickr 中的照片集中获取照片列表我的基本活动 ImagePagerActivity 调用 FetchPhotos,它扩展了异步任务。代码如下
public class ImagePagerActivity extends BaseActivity {
private static final String STATE_POSITION = "STATE_POSITION";
public static final String API_KEY="mykey";
public static final String USER_ID="myid";
DisplayImageOptions options;
private Photos thePhotoList;
ViewPager pager;
private String thePhotos="";
private final int[] timeout={3,10};
private String url="http://www.flickr.com/services/rest/?method=flickr.photosets.getPhotos&format=json&api_key="+API_KEY+"&photoset_id=111111111";
private String[] imageUrls;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ac_image_pager);
Bundle bundle = getIntent().getExtras();
String url="http://www.flickr.com/services/rest/?method=flickr.photosets.getPhotos&format=json&api_key="+API_KEY+"&photoset_id=72157633359614452";
setContentView(R.layout.pics);
try{
((ViewAnimator)findViewById(R.id.PictureAnimator)).removeAllViews();
}catch (Exception e) {}
thePhotoList = new Photos(url);
thePhotoList.execute();
imageUrls=thePhotoList.imageList;
//imageUrls = bundle.getStringArray(Extra.IMAGES);
int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);
if (savedInstanceState != null) {
pagerPosition = savedInstanceState.getInt(STATE_POSITION);
}
options = new DisplayImageOptions.Builder()
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error)
.resetViewBeforeLoading()
.cacheOnDisc()
.imageScaleType(ImageScaleType.EXACTLY)
.bitmapConfig(Bitmap.Config.RGB_565)
.displayer(new FadeInBitmapDisplayer(300))
.build();
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new ImagePagerAdapter(this.imageUrls));
pager.setCurrentItem(pagerPosition);
}
private class Photos extends com.flickr.FetchPhotos{
@Override
public void onFetchError() {}
public Photos(String url) {super(ImagePagerActivity.this, url);}
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putInt(STATE_POSITION, pager.getCurrentItem());
}
private class ImagePagerAdapter extends PagerAdapter {
private String[] images;
private LayoutInflater inflater;
ImagePagerAdapter(String[] images) {
this.images = images;
inflater = getLayoutInflater();
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
@Override
public void finishUpdate(View container) {
}
@Override
public int getCount() {
return images.length;
}
@Override
public Object instantiateItem(ViewGroup view, int position) {
View imageLayout = inflater.inflate(R.layout.item_pager_image, view, false);
ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image);
final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading);
imageLoader.displayImage(images[position], imageView, options, new SimpleImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
spinner.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
String message = null;
switch (failReason.getType()) {
case IO_ERROR:
message = "Input/Output error";
break;
case DECODING_ERROR:
message = "Image can't be decoded";
break;
case NETWORK_DENIED:
message = "Downloads are denied";
break;
case OUT_OF_MEMORY:
message = "Out Of Memory error";
break;
case UNKNOWN:
message = "Unknown error";
break;
}
Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show();
spinner.setVisibility(View.GONE);
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
spinner.setVisibility(View.GONE);
}
});
((ViewPager) view).addView(imageLayout, 0);
return imageLayout;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view.equals(object);
}
@Override
public void restoreState(Parcelable state, ClassLoader loader) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View container) {
}
}
}
接下来是 FetchPhotos 类
public abstract class FetchPhotos extends AsyncTask<Void, Void, Boolean>{
private Context context;
private ProgressDialog pd;
private String thePhotos="";
private String url;
private final int[] timeout={3,10};
public ArrayList<PictureInfo> thePics;
public String[] imageList;
public FetchPhotos(Context context,String url) {
this.context=context;
this.url=url;
}
public String[] fillGalery(JSONObject theFeed) {
// TODO Auto-generated method stub
String[] imageUrls = null;
try{
JSONArray Categories=theFeed.getJSONArray("photo");
imageUrls=new String[Categories.length()];
for (int i=0;i<(Categories.length()>15?15:Categories.length());i++){
JSONObject pic = Categories.getJSONObject(i);
String url1="http://farm"+pic.getString("farm")+".staticflickr.com/"+pic.getString("server")+"/"+
pic.getString("id")+"_"+pic.getString("secret")+".jpg";
imageUrls[i]=url1;
System.out.println(imageUrls[i]);
}
return imageUrls;
}
catch(Exception e){
}
return imageUrls;
}
@Override
protected void onPreExecute() {
pd=ProgressDialog.show(context, "downloading", "please wait");
super.onPreExecute();
}
@Override
protected Boolean doInBackground(Void... arg0) {
try{
thePhotos = new Internet().GetRequest(url, null, timeout);
return true;
}catch (Exception e) {
return false;
}
}
@Override
protected void onPostExecute(Boolean result) {
pd.dismiss();
if(result){
try {
thePhotos=thePhotos.split("\\(")[1];
thePhotos.replace("\\)", "");
imageList=fillGalery(new JSONObject(thePhotos).getJSONObject("photoset"));
} catch (Exception e) {Log.e("karp", "photolist2: "+e.getMessage());onFetchError();onFetchError();}
}else{
onFetchError();
}
super.onPostExecute(result);
}
public abstract void onFetchError();
public void LoadPhoto(PictureInfo pi){
Log.d("karp", "LoadPhoto");
if(!(pi.executed)){
new LoadPics(pi).execute();
pi.executed=true;
}
}
private class LoadPics extends RemoteImage{
private ImageView ivTarget;
private ProgressBar pb;
public LoadPics(PictureInfo pi) {
super(pi.url);
this.ivTarget=pi.iv;
this.pb=pi.pb;
}
@Override
public void onSuccess(Bitmap remoteBitmap) {
try{
pb.setVisibility(View.INVISIBLE);
ivTarget.setImageBitmap(remoteBitmap);
}catch (Exception e) {}
}
@Override
public void onFail() {pb.setVisibility(View.INVISIBLE);}
}
}
我已经在 Image Pager 中创建了 Photos 类,然后我尝试访问填充库现在我尝试使用 reurns 字符串数组的方法 fillGallery 用来自 flickr 的图像 url 填充字符串数组
在我的基本活动中,我打电话
thePhotoList = new Photos(url);
thePhotoList.execute();
imageUrls=thePhotoList.imageList;
但尽我所能,我无法在 imageUrls 中得到一个数组,它是一个字符串数组。
当我使用硬编码字符串数组和其中的图像 url 时,代码有效。任何帮助将非常感激。我确定我在做一些非常愚蠢的事情,因为我是新手。非常感谢 。干杯!