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我的问题是在AsyncTask中为listview加载图像。应用程序的输出是带有textview的listview它完美的工作，但ImageView加载几乎随机的图像，其中一些项目改变为其他图像（有时它像循环一样）。来自ListView中url的图像随机图像错误
的logcat -s “测试” - >打着什么
BinderData：
package cz.www3.tech_apps.cinetube.cinetube;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class Binderdatakomunita extends BaseAdapter {
LayoutInflater inflater;
List<HashMap<String,String>> komunitaarray;
ViewHolder holder;
public Binderdatakomunita() {
}
public Binderdatakomunita(Activity act, List<HashMap<String,String>> map) {
this.komunitaarray = map;
inflater = (LayoutInflater) act
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return komunitaarray.size();
}
public Object getItem(int arg0) {
return null;
}
public long getItemId(int position) {
return 0;
}
public int position;
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null){
vi = inflater.inflate(R.layout.lide, parent, false);
holder = new ViewHolder();
holder.jmeno = (TextView)vi.findViewById(R.id.jmeno);
holder.akce = (TextView)vi.findViewById(R.id.akce);
holder.id = (TextView)vi.findViewById(R.id.id);
holder.profilovkaimg = (ImageView)vi.findViewById(R.id.profilovka);
vi.setTag(holder);
}
else{
holder = (ViewHolder)vi.getTag();
}
holder.jmeno.setText(komunitaarray.get(position).get("jmeno"));
if (komunitaarray.get(position).get("akce") != null){
holder.akce.setText(komunitaarray.get(position).get("akce"));
} else {
holder.akce.setText("Neznámá akce");
}
try {
new DownLoadImageTask(holder.profilovkaimg).execute(komunitaarray.get(position).get("obrazek"));
} catch (Exception e) {
Log.e("test", "exception", e);
}
holder.id.setText(Integer.toString(position));
return vi;
}
static class ViewHolder{
TextView jmeno;
TextView akce;
TextView id;
ImageView profilovkaimg;
}
private class DownLoadImageTask extends AsyncTask<String,Void,Bitmap>{
ImageView imageView;
public DownLoadImageTask(ImageView imageView){
this.imageView = imageView;
}
public Bitmap scaleDown(Bitmap realImage, float maxImageSize,
boolean filter) {
float ratio = Math.min(
(float) maxImageSize/realImage.getWidth(),
(float) maxImageSize/realImage.getHeight());
int width = Math.round((float) ratio * realImage.getWidth());
int height = Math.round((float) ratio * realImage.getHeight());
Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
height, filter);
return newBitmap;
}
public Bitmap getCroppedBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
// canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
canvas.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2,
bitmap.getWidth()/2, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
//Bitmap _bmp = Bitmap.createScaledBitmap(output, 60, 60, false);
//return _bmp;
return output;
}
protected Bitmap doInBackground(String...urls){
String urlOfImage = urls[0];
Bitmap logo = null;
try{
URLConnection con = new URL(urlOfImage).openConnection();
con.connect();
InputStream is = con.getInputStream();
logo = BitmapFactory.decodeStream(is);
is.close();
}catch(Exception e){
e.printStackTrace();
}
try{
return getCroppedBitmap(scaleDown(logo, 100, true));
}catch(Exception e){
return null;
}
}
protected void onPostExecute(Bitmap result){
imageView.setImageBitmap(result);
}
}
}