public class DB_AbfrageActivity extends Activity {
    InputStream is;
    ArrayList<String> results=new ArrayList<String>();
    JSONObject json_data;
    ArrayList<NameValuePair> nameValuePairs=new ArrayList<NameValuePair>();
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);       
    }
    
    public void getData(){
        String result="";
        
    try{
            HttpClient httpclient=new DefaultHttpClient();
            HttpPost httppost=new HttpPost("http://localhost/mysql.php");
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response=httpclient.execute(httppost);
            HttpEntity entity=response.getEntity();
            is=entity.getContent();
        }catch (Exception e){
            Log.e("log_tag", "Fehler bei der http Verbindung "+e.toString());
        }
        
        try{
            BufferedReader reader=new BufferedReader(new InputStreamReader(is,"utf8_general_ci"),8);
            StringBuilder sb=new StringBuilder();
            String line="0";
            while ((line=reader.readLine())!=null){
                sb.append(line+"\n");
            }
            is.close();
            result=sb.toString();
        }catch (Exception e){
            Log.e("log_tag","Error converting result "+e.toString());
        }
        
        try{
            
            JSONArray jArray=new JSONArray(result);
            for(int i=0;i<jArray.length();i++){
                json_data=jArray.getJSONObject(i);
                results.add((String) json_data.get("artikel")+" "+json_data.get("menge")+" "+json_data.get("bez")+" "+json_data.get("zeit"));
            }
            fillList();
        }catch (JSONException e){
            Log.e("log_tag", "Error parsing data "+e.toString());
        }
    }
    
    public void fillList(){
        ListAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1, results);
        ListView list=(ListView)findViewById(R.id.listView1);
        list.setAdapter(adapter);
    }
    
}

 String result = EntityUtils.toString(entity, HTTP.UTF_8);

    // parse json data
    try {
        JSONArray jArray = new JSONArray(result);                           
        for (int i = 0; i < jArray.length(); i++) {
        JSONObject json_data = jArray.getJSONObject(i);
....

...
sb.deleteCharAt(0);
String result = sb.toString();
result.trim();
        }catch (Exception e){             Log.e("log_tag","Error converting result "+e.toString());         }
...