عدم دریافت تصاویر از دیتابیس (وقتی میخاد تصاویر رو دانلود کنه برنامه کرش می کنه)

سلام. من دارم یک برنامه شبیه به دیوار می نویسم. تو قسمت نمایش آگاهی ها (اکتیوتی ads_agahi )، تصاویر مربوط به آگهی ها دانلود نمیشن. بلافاصله برنامه کرش می کند.

دوستان میتونید برای راهنمایی به پی وی پیام بدین: Ahmad3169@ 

اینم سورس کد صفحه نمایش آگهی ها (سورس کد مربوط به دانلود تصاویر تو همین سورس کد هست)

package com.example.np.myapp;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class ads_agahi extends AppCompatActivity {

    private String url_ads;
    private int current_page = 0;

    private ListView lv;

    private List<HashMap<String, Object>> all_ads = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ads_agahi);

        Bundle address = getIntent().getExtras();

        url_ads = address.getString("url");

        lv = (ListView) findViewById(R.id.ads_list);

        make_ads_list();
    }

    public void make_ads_list() {
        try {
            DownloadTask dl = new DownloadTask();

            dl.execute(url_ads + current_page);

            current_page++;


        } catch (Exception e) {

            Log.i("Ahmad moenee", "error in ads in make_ads_list() ->" + e.toString());

        }
    }

    private class DownloadTask extends AsyncTask<String, Void, String> {


        @Override
        protected String doInBackground(String... params) {
            String temp = "";

            try {
                JSONDownloader jd = new JSONDownloader();

                temp = jd.downloadURL(params[0]);


            } catch (Exception e) {

                Log.i("Ahmad moenee", "error in DownloadTask  ->" + e.toString());

            }

            return (temp);
        }

        @Override
        protected void onPostExecute(String s) {
            ListViewLoaderTask loader = new ListViewLoaderTask();

            loader.execute(s);


        }
    }

    private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter> {

        @Override
        protected SimpleAdapter doInBackground(String... params) {
            try {
                AdsParser parser = new AdsParser();
                all_ads.addAll(parser.parse(params[0]));
            } catch (Exception e) {

                Log.i("Ahmad moenee", "error in ListViewLoaderTask ->" + e.toString());

            }

            String[] from = {"image", "title", "intro", "date", "cat"};

            int[] to = {R.id.ads_img, R.id.ads_title, R.id.ads_intro,
                    R.id.ads_date, R.id.ads_cat};

            SimpleAdapter adb = new SimpleAdapter(
                    getBaseContext(), all_ads, R.layout.ads_list_row, from, to
            );

            return adb;
        }


        @Override
        protected void onPostExecute(SimpleAdapter adapter) {

            lv.setAdapter(adapter);

            for (int i = 0; i < adapter.getCount(); i++) {

                HashMap<String, Object> hm =
                        (HashMap<String, Object>) adapter.getItem(i);

                String imgURL = (String) hm.get("image_path");

                HashMap<String, Object> forDownload = new HashMap<>();

                forDownload.put("image_path", imgURL);
                forDownload.put("position", i);

                ImageDownloaderTask imgDownloader = new ImageDownloaderTask();

                imgDownloader.execute(forDownload);

            }

        }
    }

    private class ImageDownloaderTask extends
           AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>> {


        @Override
        protected HashMap<String, Object> doInBackground(HashMap<String, Object>... params) {
            InputStream mySteam;

            String imgURL = (String) params[0].get("image_path");
            int position = (Integer) params[0].get("position");

            try {

                URL url = new URL(imgURL);

                HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                connection.setDoInput(true);

                connection.connect();

                mySteam = connection.getInputStream();

                File cacheDirectory = getBaseContext().getCacheDir();

                File temp = new File(cacheDirectory.getPath()
                        + "/image_" + position + "_" + current_page + ".png");

                FileOutputStream outStream = new FileOutputStream(temp);

                Bitmap b = BitmapFactory.decodeStream(mySteam);

                b.compress(Bitmap.CompressFormat.PNG, 100, outStream);

                outStream.flush();

                outStream.close();

                HashMap<String, Object> bitmap = new HashMap<>();

                bitmap.put("image", temp.getPath());
                bitmap.put("position", position);

                return (bitmap);

            } catch (Exception e) {
               Log.i("Ahmad moenee", "error in ImageDonloaderTask ->" + e.toString());


            }


            return null;
        }


        @Override
        protected void onPostExecute(HashMap<String, Object> result) {
            String image = (String) result.get("image");

            int position = (Integer) result.get("position");

            SimpleAdapter adb = (SimpleAdapter) lv.getAdapter();

            HashMap<String, Object> hm = (HashMap<String, Object>)
                    adb.getItem(position);

            hm.put("image", image);

            adb.notifyDataSetChanged();

        }

    }


    public void onbackToHomeClick(View v) {

        finish();
    }
}