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POissue in looping in gridview with json android
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  1. POissue in looping in gridview with json android
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    copied!<p>Iam developing app to display images from url(which iam getting these urls from <code>json webservices</code>) in a <code>gridview</code>. When i give urls directly the code is success.</p> <p>Below is my code:</p> <pre><code> package com.example.sample; import java.io.IOException; import java.io.InputStream; import java.lang.ref.SoftReference; import java.net.MalformedURLException; import java.net.URI; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.LinkedList; import java.util.Map; import java.util.WeakHashMap; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.HttpContext; import org.json.JSONArray; import org.json.JSONObject; import com.example.sample.R; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.graphics.Color; import android.graphics.Typeface; import android.graphics.drawable.Drawable; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.GridView; import android.widget.ImageView; import android.widget.TableLayout; import android.widget.TableRow; import android.widget.TextView; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ListView; public class MainActivity extends Activity { GridView list; LazyAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); list=(GridView)findViewById(R.id.list); adapter=new LazyAdapter(this, mStrings); list.setAdapter(adapter); adapter.imageLoader.clearCache(); adapter.notifyDataSetChanged(); } private String[] mStrings={ "http://www.1.png", "http://www.2.png", "http://www.3.png", "http://www.4.png", "http://www.5.png" }; } </code></pre> <p>here it is showing me correctly these five images in gridview. Now my question is <strong>how to send list of urls directly into gridview from my AsynchronousTask</strong>.</p> <p>below is my <code>AsynchronousTask code</code>.</p> <pre><code>private class LongRunningGetIO extends AsyncTask &lt;Void, Void, ArrayList&lt;String&gt;&gt; { protected String getASCIIContentFromEntity(HttpEntity entity) throws IllegalStateException, IOException { InputStream in = entity.getContent(); StringBuffer out = new StringBuffer(); int n = 1; while (n&gt;0) { byte[] b = new byte[4096]; n = in.read(b); if (n&gt;0) out.append(new String(b, 0, n)); } return out.toString(); } @Override protected ArrayList&lt;String&gt; doInBackground(Void... params) { HttpClient httpClient = new DefaultHttpClient(); HttpContext localContext = new BasicHttpContext(); HttpGet httpGet = new HttpGet("myurl"); String text = null; String result = null; ArrayList&lt;String&gt; imageurl=new ArrayList&lt;String&gt;(); String name=null; String id; try { HttpResponse response = httpClient.execute(httpGet, localContext); HttpEntity entity = response.getEntity(); text = getASCIIContentFromEntity(entity); JSONArray ja = new JSONArray(text) ; // ITERATE THROUGH AND RETRIEVE CLUB FIELDS int n = ja.length(); for (int i = 0; i &lt; n; i++) { // GET INDIVIDUAL JSON OBJECT FROM JSON ARRAY JSONObject jo = ja.getJSONObject(i); imageurl.add(jo.getString("ImageUrl")); name= jo.getString("ImageName"); id= jo.getString("ImageId"); } } catch (Exception e) { e.getLocalizedMessage(); } return imageurl; } protected void onPostExecute(ArrayList&lt;String&gt; results){ if(results!=null){ for(int j=0;j&lt;results.size();j++){ String[] mStrings={results.get(j)}; } } } } </code></pre> <p>My LazyAdapter code is:</p> <pre><code> public class LazyAdapter extends BaseAdapter { private Activity activity; private String[] data; private static LayoutInflater inflater=null; public ImageLoader imageLoader; public LazyAdapter(Activity a, String[] d) { activity = a; data=d; inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); imageLoader=new ImageLoader(activity.getApplicationContext()); } public int getCount() { return data.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { View vi=convertView; if(convertView==null) vi = inflater.inflate(R.layout.item, null); ImageView image=(ImageView)vi.findViewById(R.id.image); imageLoader.DisplayImage(data[position], image); return vi; } } </code></pre> <p>How to send <code>imageurl(Arraylist)</code> into <code>mStrings(string array)</code>?</p>
 

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