【发布时间】：2014-05-20 13:08:57
【问题描述】：
我在使用 Universal Image Loader 加载列表视图时遇到问题。问题是我不知道把函数放在哪里来调用它，因为总是出现 RuntimeException。例外是由于 doinBackground 中的 ImageLoader。
我的代码如下：
公共类 Listview 扩展 Activity 实现 View.OnClickListener {
private ListView lstView;
private ImageAdapter imageAdapter;
ArrayList<HashMap<String, Object>> MyArrList = new ArrayList<HashMap<String, Object>>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ProgressBar
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.activity_list);
// ListView and imageAdapter
lstView = (ListView) findViewById(R.id.listView1);
lstView.setClipToPadding(false);
imageAdapter = new ImageAdapter(getApplicationContext());
imageAdapter.notifyDataSetChanged();//When add new photos, refresh the view
lstView.setAdapter(imageAdapter);
lstView.invalidateViews();
setProgressBarIndeterminateVisibility(true);
new LoadContentFromServer().execute();
}
class LoadContentFromServer extends AsyncTask<Object, Integer, Object> {
@Override
protected Object doInBackground(Object... params) {
String url = "http://xxxxxxxxxxxxxx/xxxxxxx/Xxxx.php";
String photo_id_new;
String photo_id_prev = "";
JSONArray data;
imageAdapter.notifyDataSetChanged();
try {
data = new JSONArray(getJSONUrl(url));
MyArrList = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> map;
for(int i = 0; i < data.length(); i++) {
JSONObject c = data.getJSONObject(i);
map = new HashMap<String, Object>();
photo_id_new = c.getString("photo_id");
map.put("ImageID", c.getString("photo_id"));
map.put("NameAcc", c.getString("nameacc"));
map.put("PriceAcc", c.getString("price"));
map.put("BrandAcc", c.getString("brand"));
map.put("Shopname", c.getString("shopname"));
map.put("Shopcity", c.getString("city"));
map.put("Shopcountry", c.getString("country"));
map.put("UserName", c.getString("forename"));
map.put("UserSurname", c.getString("surname"));
//If the new photo it's different to the previous, doesn't show and create more rows
if(!photo_id_prev.equals(photo_id_new)){
// Thumbnail Get ImageBitmap To Object
//Bitmap newBitmap = loadBitmap(c.getString("hyperlink"));
Bitmap newBitmap2 = ImageLoader.getInstance().loadImageSync(c.getString("hyperlink"));
Log.i("INFO", "Hyperlink: " + c.getString("hyperlink"));
map.put("ImageThumBitmap", newBitmap2);
map.put("Repeat", "1"); //To know if it is a new photo
} else {
// no new photo
map.put("Repeat", "0");
Log.i("INFO", "Inside else");
}
photo_id_prev = photo_id_new;
Log.i("INFO", "Previous photo id: "+photo_id_prev);
MyArrList.add(map);
publishProgress(i);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e){
e.printStackTrace();
}
return null;
}
@Override
public void onProgressUpdate(Integer... progress) {
imageAdapter.notifyDataSetChanged();
}
@Override
protected void onPostExecute(Object result) {
setProgressBarIndeterminateVisibility(false); // When Finish
}
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context context) {
mContext = context;
}
public int getCount() {
return MyArrList.size();
}
public Object getItem(int position) {
return MyArrList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
//View row = convertView;
ViewHolder holder;
DisplayImageOptions options = new DisplayImageOptions.Builder()
.resetViewBeforeLoading(true)
.cacheInMemory(true)
.cacheOnDisc(true)
.bitmapConfig(Bitmap.Config.RGB_565) // default
.displayer(new SimpleBitmapDisplayer())
.imageScaleType(ImageScaleType.EXACTLY)
.build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext())
.threadPriority(Thread.MAX_PRIORITY).threadPoolSize(5)
.denyCacheImageMultipleSizesInMemory()
.memoryCache(new UsingFreqLimitedMemoryCache(6 * 1024 * 1024))
.discCacheFileNameGenerator(new Md5FileNameGenerator())
.tasksProcessingOrder(QueueProcessingType.LIFO)
.build();
ImageLoader.getInstance().init(config);
Object repeat = MyArrList.get(position).get("Repeat");
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
//Try when row = null
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.activity_column, null);
holder = new ViewHolder();
holder.imageView = (ImageView) convertView.findViewById(R.id.ColImgPath);
holder.tvUsername = (TextView) convertView.findViewById(R.id.tVforename);
holder.tvUserSurname = (TextView) convertView.findViewById(R.id.tVsurname);
holder.ivProfilePhoto = (ImageView) convertView.findViewById(R.id.pphoto);
holder.tvNameAcc = (TextView) convertView.findViewById(R.id.N);
holder.tvBrandAcc = (TextView) convertView.findViewById(R.id.B);
holder.tvPriceAcc = (TextView) convertView.findViewById(R.id.P);
holder.tvShopAcc = (TextView) convertView.findViewById(R.id.S);
convertView.setTag(holder);
}
else{
holder = (ViewHolder) convertView.getTag();
}
String url = (MyArrList.get(position).get("ImageThumBitmap").toString());
// ColImage
holder.imageView.setPadding(5, 5, 5, 5);
//holder.imageView.setScaleType(ImageView.ScaleType.CENTER);
holder.imageView.setRotation(90);
//Depends on the photo show or hidden the name and surname
if(repeat.equals("1")){
holder.imageView.setVisibility(View.VISIBLE);
holder.tvUserSurname.setVisibility(View.VISIBLE);
holder.tvUsername.setVisibility(View.VISIBLE);
holder.tvUserSurname.setText(MyArrList.get(position).get("UserSurname").toString());
holder.tvUsername.setText(MyArrList.get(position).get("UserName").toString());
try {
//Bitmap bmp = ((Bitmap) MyArrList.get(position).get("ImageThumBitmap"));
//int size = Math.min(bmp.getWidth(), bmp.getHeight());
//int x = (bmp.getWidth() - size) / 16;
//int y = (bmp.getHeight() - size) / 9;
//Bitmap result = bmp.createBitmap(bmp, x, y, size, size);
//Bitmap photobitmap1 = Bitmap.createScaledBitmap(bmp, width/2, height/2, true);
//holder.imageView.setImageBitmap(bmp);
ImageLoader.getInstance().displayImage(url, holder.imageView);
//holder.imageView.setImageBitmap((Bitmap) MyArrList.get(position).get("ImageThumBitmap"));
} catch (Exception e) {
// When Error
holder.imageView.setImageResource(android.R.drawable.ic_menu_report_image);
}
}
else {
//If the photo_id is repeated these params are not shown
holder.tvUserSurname.setVisibility(View.GONE);
holder.tvUsername.setVisibility(View.GONE);
holder.imageView.setVisibility(View.GONE);
}
// ColNameAcc
holder.tvNameAcc.setPadding(20, 0, 0, 0);
holder.tvNameAcc.setText(MyArrList.get(position).get("NameAcc").toString());
// ColBrandAcc
holder.tvBrandAcc.setPadding(20, 0, 0, 0);
holder.tvBrandAcc.setText(MyArrList.get(position).get("BrandAcc").toString());
// ColPriceAcc
holder.tvPriceAcc.setPadding(20, 0, 0, 0);
holder.tvPriceAcc.setText(MyArrList.get(position).get("PriceAcc").toString()
// ColShopAcc
holder.tvShopAcc.setPadding(20, 0, 0, 0);
holder.tvShopAcc.setText(MyArrList.get(position).get("Shopname").toString());
return convertView;
}
}
public static class ViewHolder {
ImageView imageView;
TextView tvUsername;
TextView tvUserSurname;
ImageView ivProfilePhoto;
TextView tvNameAcc;
TextView tvBrandAcc;
TextView tvPriceAcc;
TextView tvShopAcc;
}
}
Logcat 错误：
05-20 13:52:50.496 6524-3500/com.AndroidUK.SocialApp.app E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #4
Process: com.AndroidUK.SocialApp.app, PID: 6524
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6094)
at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:824)
at android.view.View.requestLayout(View.java:16455)
at android.view.View.requestLayout(View.java:16455)
at android.view.View.requestLayout(View.java:16455)
at android.view.View.requestLayout(View.java:16455)
at android.view.View.requestLayout(View.java:16455)
at android.view.View.requestLayout(View.java:16455)
at android.widget.AbsListView.requestLayout(AbsListView.java:1916)
at android.widget.AdapterView$AdapterDataSetObserver.onChanged(AdapterView.java:814)
at android.widget.AbsListView$AdapterDataSetObserver.onChanged(AbsListView.java:6280)
at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37)
at android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50)
at com.AndroidUK.SocialApp.app.Listview$LoadContentFromServer.doInBackground(Listview.java:212)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
在 android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 在 java.lang.Thread.run(Thread.java:841)
我也有刷新列表视图的问题，因为数据来自数据库，我不知道如何通知有新照片。有时应用程序会关闭，因为我上传了一张新照片。当我上传照片并且没有关闭我查看列表视图的应用程序时会发生这种情况。
谢谢
【问题讨论】：
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添加日志会有所帮助..
标签： android android-listview android-asynctask android-image universal-image-loader