在listview中加载图像

Question

我有一个使用json获取链接和文本的应用程序，现在我想在Listview中从下载的URL（通过json）加载图像。

我可以在列表视图中加载文本，但我可以加载图像！

PLZ帮助我，我为此花了2天时间搜索，但是没有机会！我真的需要你的帮助！任何人都可以帮助我，我会非常感谢他的申请。 PLZZZ帮帮我。

我的代码：

package rappage.rapfarsi.media.appteam.rapnews;


import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v4.app.ListFragment;
 import android.util.Log;
 import android.view.LayoutInflater;
     import android.view.View;
     import android.view.ViewGroup;
   import android.widget.ListAdapter;
  import android.widget.ListView;
 import android.widget.SimpleAdapter;
import android.widget.TextView;
 import android.widget.Toast;

import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
 import org.json.JSONObject;

import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;

import rappage.rapfarsi.media.appteam.Articlectivity;
 import rappage.rapfarsi.media.appteam.Main;
  import rappage.rapfarsi.media.appteam.R;
  import rappage.rapfarsi.media.appteam.json.JSONParser;


public class tab2 extends ListFragment {


static final String url_all_products = "http://normaluse.persianrapapp021.ml/article/get_all_products.php";
// Progress Dialog
private ProgressDialog pDialog;

// Creating JSON Parser object
JSONParser jParser = new JSONParser();

ArrayList<HashMap<String, String>> productsList;

// url to get all products list
final String TAG_SUCCESS = "success";
final String TAG_RAPNEWS = "article";
final String TAG_PID = "pid";
final String TAG_TITLE = "title";
final String TAG_PIC = "pic";
final String TAG_WRITER = "writer";
Bitmap bmp;

// JSON Node names

// products JSONArray
JSONArray rapnews = null;


public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {


    View v = inflater.inflate(R.layout.tab_2, container, false);
    final View rootView = super.onCreateView(inflater, container, savedInstanceState);




    // Hashmap for ListView
    productsList = new ArrayList<HashMap<String, String>>();
    // Loading products in Background Thread

    /**
     * Background Async Task to Load all product by making HTTP Request
     * */

    try {



        new LoadAllProducts().execute();

    }catch (Exception e)
    {

        final AlertDialog.Builder dlgAlert = new AlertDialog.Builder(getActivity());
        dlgAlert.setMessage("لطفا اینترنت خودرا چک کنید! یا ممکن است سرور از دسترس خارج شده باشد ، برای اخبار اپدیت و مشکلات به ویکی رپ مراجعه کنید!");
        dlgAlert.setTitle("Connection Error!");
        dlgAlert.setNegativeButton("باشه گرفتم", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                startActivity(new Intent(getActivity() , Main.class));
            }
        });

        dlgAlert.create().show();
    }





    return v;

}








class LoadAllProducts extends AsyncTask<String, String, String> {


    /**
     * Before starting background thread Show Progress Dialog
     */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(getActivity());
        pDialog.setMessage("Loading, Wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting All products from url
     */
    protected String doInBackground(String... args) {
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        // getting JSON string from URL
        JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

        // Check your log cat for JSON reponse
        Log.d("All Products: ", json.toString());

        try {
            // Checking for SUCCESS TAG
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // products found
                // Getting Array of Products
                rapnews = json.getJSONArray(TAG_RAPNEWS);

                // looping through All Products
                for (int i = 0; i < 11; i++) {
                    JSONObject c = rapnews.getJSONObject(i);

                    // Storing each json item in variable
                    String id = c.getString(TAG_PID);
                    String name = c.getString(TAG_TITLE);
                    String pic = c.getString(TAG_PIC);





                    // creating new HashMap
                    HashMap<String, String> map = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    map.put(TAG_PID, id);
                    map.put(TAG_TITLE, name);
                    map.put(TAG_PIC, pic);




                    // adding HashList to ArrayList
                    productsList.add(map);
                }
            } else {
                // no products found
                // Launch Add New product Activity
                Intent i = new Intent(getActivity().getApplicationContext(),
                        Main.class);
                // Closing all previous activities
                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(i);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * *
     */
    protected void onPostExecute(String file_url) {

        // dismiss the dialog after getting all products
        pDialog.dismiss();

        // updating UI from Background Thread
        getActivity().runOnUiThread(new Runnable() {
            public void run() {
                /**
                 * Updating parsed JSON data into ListView
                 * */
                ListAdapter adapter = new SimpleAdapter(
                        getActivity(), productsList,
                        R.layout.list_item, new String[]{TAG_PID,
                        TAG_TITLE},
                        new int[]{R.id.pid, R.id.txttitle}



                );

                setListAdapter(adapter);

            }
        });

    }

}













public void onListItemClick(ListView l, View v, int position, long id) {
    Toast.makeText(getActivity().getApplicationContext(), "Loading, Please Wait...",
            Toast.LENGTH_LONG).show();

    String pid = ((TextView) v.findViewById(R.id.pid)).getText()
            .toString();

    // Starting new intent
    Intent in = new Intent(getActivity(),Articlectivity.class);
    // sending pid to next activity
    in.putExtra(TAG_PID, pid);

    // starting new activity and expecting some response back
    startActivity(in);
}


}

我想在这个基础上加载图像...或者其他任何东西...

Answer 1

你可以使用名为Picasso的方形库 Here是文档。

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

这是一个包含2个文本和图像的列表视图的自定义适配器

public class CustomArrayAdapter extends ArrayAdapter<String> {
    private final Context context;
    private final String[] values1;
    private final String[] values2;

    public CustomArrayAdapter(Context context, String[] values1, String[] values2) {
        super(context, R.layout.some_layout, values1);
        this.context = context;
        this.values1 = values1;
        this.values2 = values2;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
//        LayoutInflater inflater = LayoutInflater.from(context);
//        View rowView = inflater.inflate(R.layout.some_layout, null);
        View rowView = convertView;
        if (rowView == null) {
            LayoutInflater inflater = LayoutInflater.from(context);
            rowView = inflater.inflate(R.layout.some_layout, null);
            holder = new ViewHolder();
            holder.text1 = (TextView) rowView.findViewById(R.id.firstLine);
            holder.text2 = (TextView) rowView.findViewById(R.id.secondLine);
            holder.img = (ImageView) rowView.findViewById(R.id.imageView);
            rowView.setTag(holder);
        }
        else {
            holder=(ViewHolder)rowView.getTag();
        }
        holder.text1.setText(values1[position]);
        holder.text2.setText(values2[position]);
        Picasso.with(rowView.getContext()).load("http://www.9ori.com/store/media/images/8ab579a656.jpg").into(holder.img);
//        if (position%2==0) {
//            holder.img.setImageResource(R.drawable.correct);
//        }
//        else {
//            holder.img.setImageResource(R.drawable.incorrect);
//        }
        return rowView;
    }

    public static class ViewHolder {
        public TextView text1, text2;
        public ImageView img;
    }
}

Answer 2

有很多图像加载库可供Android使用 看看这些

https://github.com/square/picasso
https://github.com/nostra13/Android-Universal-Image-Loader
https://code.google.com/p/android-query/wiki/ImageLoading
https://android.googlesource.com/platform/frameworks/volley
https://github.com/koush/UrlImageViewHelper
https://github.com/novoda/image-loader