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POListViewActivity with Custom Adapter doesn' t work
 

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  1. POListViewActivity with Custom Adapter doesn' t work
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    <p>Dear Stackoverflow Comunitiy,</p> <p>I'd like to have a ListView getting filled by an BackgroundTask. This is my actual Code</p> <p>HomeActivity:</p> <pre><code>package com.example.instaemgnew; import java.util.ArrayList; import android.app.ListActivity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import com.example.instaemgnew.classes.Beitrag; import com.example.instaemgnew.classes.beitragLoader; import com.example.instaemgnew.classes.listViewHomeActivitiyAdapter; public class HomeActivity extends ListActivity { listViewHomeActivitiyAdapter adapter; ArrayList&lt;Beitrag&gt; beitraege = new ArrayList&lt;Beitrag&gt;(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home); adapter = new listViewHomeActivitiyAdapter(this, beitraege); setListAdapter(adapter); Log.e("TestPoint 1", "Adapter Set"); new beitragLoader(this).execute(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_home, menu); return true; } public void addToListView(Beitrag toAddBeitrag){ beitraege.add(toAddBeitrag); adapter.notifyDataSetChanged(); } } </code></pre> <p>BackgroundTask:</p> <pre><code>package com.example.instaemgnew.classes; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; import java.util.List; import org.apache.http.NameValuePair; import org.apache.http.message.BasicNameValuePair; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import com.example.instaemgnew.HomeActivity; import android.content.Context; import android.net.Uri; import android.os.AsyncTask; import android.os.Environment; import android.util.Log; import android.widget.ArrayAdapter; public class beitragLoader extends AsyncTask&lt;String, String, String&gt;{ //Array List für die Beiträge ArrayList&lt;Beitrag&gt; beitraege; //User Daten /*mail = userManager.getMail(); grade = String.valueOf(userManager.getGrade()); school = userManager.getSchool();*/ String mail = "simon-frey@gmx.de"; String grade = String.valueOf(334); String school = "EMG"; //JSONParser JSONParser jsonParser = new JSONParser(); //ArrayList mit Beitrag Objekten ArrayList&lt;Beitrag&gt; beitraegeList; // Onlinedaten private static final String SERVER_URL = "http://yooui.de/InstaEMGTest/"; private static final String PASSWORD = "8615daf406f7e2b313494f0240"; //Context private final HomeActivity homeActivity; //Konstruktor public beitragLoader(HomeActivity homeActivity){ this.homeActivity = homeActivity; Log.e("TestPoint 2", "Created beitragLoader"); } @Override protected void onPreExecute() { super.onPreExecute(); //TODO: Test for InternetConnection Log.e("TestPoint 3", "PreExectute"); } /** * getting All products from url * */ protected String doInBackground(String... args) { beitraegeList = new ArrayList&lt;Beitrag&gt;(); String SQLUrl = SERVER_URL + "testBeiträgeAbrufen.php"; String token = getMD5Hash("password" + "data"); List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("token", token)); //TODO: params.add(new BasicNameValuePair("page", skipBeitraege)) params.add(new BasicNameValuePair("grade", grade)); params.add(new BasicNameValuePair("school", school)); JSONObject json = jsonParser.makeHttpRequest(SQLUrl, "GET", params); if (json == null) { // Server offline } Log.e("TestPoint 3,5", "FetchedJSON"); try { JSONArray beitraege = json.getJSONArray("beitraege"); // looping through All Products for (int i = 0; i &lt; beitraege.length(); i++) { Beitrag tempBeitrag = null; Log.e("TestPoint 3,6", "StartLoop"); JSONObject c = beitraege.getJSONObject(i); //HDImagesURLList ArrayList ArrayList&lt;String&gt; HDImagesURLList = new ArrayList&lt;String&gt;(); // Storing each json item in variable String id = c.getString("ID"); String url = c.getString("url"); String titel = c.getString("titel"); String tags = c.getString("tags"); String onlineDate = c.getString("onlineDate"); Log.e("TestPoint 3,7", "Stored JSON Items"); //Fetching previewImage try { Log.e("TestPoint 3,8", "TryImageDownload"); InputStream in = new java.net.URL(url).openStream(); String fileName = "InstaEMG" + String.valueOf(System.currentTimeMillis())+".jpg"; Log.e("imageUri", url); Log.e("fileName", fileName); FileOutputStream fileOutput = new FileOutputStream(new File(Environment.getExternalStorageDirectory(),fileName)); byte[] buffer = new byte[1024]; int bufferLength = 0; while ((bufferLength = in.read(buffer)) &gt; 0 ) { fileOutput.write(buffer, 0, bufferLength); Log.e("File Output", String.valueOf(bufferLength)); } //Fill HDImagesURLList //TODO // creating newBeitrag tempBeitrag = new Beitrag(Integer.parseInt(id), titel, onlineDate, fileName, HDImagesURLList); // adding Beitrag to ArrayList beitraegeList.add(tempBeitrag); Log.e("TestPoint 4", "NewBeitragSet"); } catch (MalformedURLException e) { Log.e("Exceptrion", "URL Exception"); } catch (IOException e) { Log.e("Exceptrion", "IO Exception"); } homeActivity.addToListView(tempBeitrag); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * After completing background Safe to MainActivity * **/ protected void onPostExecute() { Log.e("TestPoint 5", "PostExecutre"); // homeActivity.updateListView(beitraegeList); } /** * Methode zum Errechnen eines MD5Hashs * * @param string * String welcher kodiert werden soll * @return MD5 Hash des Strings, bei Fehler der ursprüngliche String. */ private String getMD5Hash(String string) { try { MessageDigest md5 = MessageDigest.getInstance("MD5"); md5.update(string.getBytes()); byte[] result = md5.digest(); StringBuffer hexString = new StringBuffer(); for (int i = 0; i &lt; result.length; i++) { if ((0xff &amp; result[i]) &lt; 0x10) { hexString.append("0" + Integer.toHexString((0xFF &amp; result[i]))); } else { hexString.append(Integer.toHexString(0xFF &amp; result[i])); } } string = hexString.toString(); } catch (NoSuchAlgorithmException e1) { e1.printStackTrace(); } return string; }; } </code></pre> <p>and the BaseAdapter:</p> <pre><code>package com.example.instaemgnew.classes; import java.util.ArrayList; import com.example.instaemgnew.R; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class listViewHomeActivitiyAdapter extends BaseAdapter { private final Context context; private ArrayList&lt;Beitrag&gt; beitraege; private final LayoutInflater layoutInflater; public listViewHomeActivitiyAdapter(Context context, ArrayList&lt;Beitrag&gt; beitraege) { super(); this.beitraege = beitraege; this.context = context; this.layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public View getView(final int position, View convertView, ViewGroup parent) { //Allgemeien Layout Vorgaben LayoutInflater inflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View rowView = inflater.inflate(R.layout.single_beitrag_row_layout, parent, false); if (convertView == null) { convertView = layoutInflater.inflate(R.layout.single_beitrag_row_layout, null); } //getViews TextView titelView = (TextView) rowView.findViewById(R.id.beitragTitel); ImageView beitragImageView = (ImageView) rowView.findViewById(R.id.beitragImg); /* * TODO: Tags anzeigen und suchen lassen (Wunschfunktion) * TextView tagsView = (TextView) rowView.findViewById(R.id.beitragTags); */ //setTitel From Object titelView.setText(beitraege.get(position).getTitel()); //setPreviewImage From Object beitragImageView.setImageBitmap(beitraege.get(position).getPreviewImage()); //setOnClickListener on PreviewImage for PopOutGallery beitragImageView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //TODO: PopOut Gallery } }); return rowView; } @Override public int getCount() { return beitraege.size(); } @Override public Object getItem(int position) { return beitraege.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } } </code></pre> <p>In my opinion the Bug have to be in the BaseAdapter, but I don't know where it could be.</p> <p>Sincerly and thankful,</p> <p>Simon</p>
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    1. COwhat is that doesn't work?
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    2. COhttp://stackoverflow.com/questions/20418253/correct-item-is-not-selected-in-listview check this link for answer
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      1. POListViewActivity with Custom Adapter doesn' t work
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    3. COyour `beitraege` value only populates after `AsyncTask` completion so try to set your adapter `onPostExecute()`. You can not directly access your activity's listview from asynctask so try to create interface as a asynctask callback or else write to asynctask within activity class
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      1. USSathishKumar
 

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