JSON Array in listView ausgeben

102-13 20:12:20.902: E/log_tag(8536): Fehler bei der HTTP-Verbindung android.os.NetworkOnMainThreadException
202-13 20:12:20.902: E/log_tag(8536): Error converting result java.lang.NullPointerException
302-13 20:12:20.914: E/log_tag(8536): Error parsing data org.json.JSONException: End of input at character 0 of

1package at.dtr.firstapp;
2
3import java.io.BufferedReader;
4import java.io.InputStream;
5import java.io.InputStreamReader;
6import java.util.ArrayList;
7
8import org.apache.http.HttpEntity;
9import org.apache.http.HttpResponse;
10import org.apache.http.NameValuePair;
11import org.apache.http.client.HttpClient;
12import org.apache.http.client.entity.UrlEncodedFormEntity;
13import org.apache.http.client.methods.HttpPost;
14import org.apache.http.impl.client.DefaultHttpClient;
15import org.json.JSONArray;
16import org.json.JSONException;
17import org.json.JSONObject;
18
19import android.app.Activity;
20import android.app.ListActivity;
21import android.os.Bundle;
22import android.util.Log;
23import android.widget.ArrayAdapter;
24
25public class FirstAppActivity extends ListActivity {
26 /** Called when the activity is first created. */
27 InputStream is;
28 ArrayList<String> results = new ArrayList<String>();
29 JSONObject json_data;
30
31 @Override
32 public void onCreate(Bundle savedInstanceState) {
33 super.onCreate(savedInstanceState);
34 //setContentView(R.layout.main);
35
36 // beim Start der Activity wird gleich getData() aufgerufen
37 getData();
38 }
39
40
41 public void getData() {
42
43 // IP angeben
44 String IP = "192.168.1.108";
45 // PHP-File angeben
46 String PhpFile = "getdata.php";
47
48
49 String result = "";
50 ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
51
52 // Verbindung zur PHP-Datei wird hergestellt
53 try {
54 HttpClient httpclient = new DefaultHttpClient();
55 HttpPost httppost = new HttpPost("http://" + IP + "/" + PhpFile);
56 httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
57 HttpResponse response = httpclient.execute(httppost);
58 HttpEntity entity = response.getEntity();
59 is = entity.getContent();
60 } catch (Exception e) {
61 Log.e("log_tag", "Fehler bei der HTTP-Verbindung " + e.toString());
62 }
63
64 // die Tabellendaten, die von der PHP-Datei ausgelesen wurden, werden in den String 'result' gespeichert
65 try {
66 BufferedReader reader = new BufferedReader(new InputStreamReader(
67 is, "iso-8859-1"), 8);
68 StringBuilder sb = new StringBuilder();
69 String line = null;
70 while ((line = reader.readLine()) != null) {
71 sb.append(line + "n");
72 }
73 is.close();
74 result = sb.toString();
75 } catch (Exception e) {
76 Log.e("log_tag", "Error converting result " + e.toString());
77 }
78
79 // String 'result' wird in ein JSON-Array konvertiert
80 try {
81 JSONArray jArray = new JSONArray(result);
82 for (int i = 0; i < jArray.length(); i++) {
83 json_data = jArray.getJSONObject(i);
84 results.add((String) json_data.get("name") + " "
85 + json_data.get("image") + " " + json_data.get("description"));
86 }
87 fillList();
88 } catch (JSONException e) {
89 Log.e("log_tag", "Error parsing data " + e.toString());
90 }
91
92 }
93
94 // String 'result' wird in die listView geschrieben
95 public void fillList() {
96 this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, results));
97 }
98
99
100
101
102}