I want to get some data from a mysql
database.
The PHP code:
<?php
$verbindung = mysql_connect ("",
"", "")
or die ("keine Verbindung möglich.
Benutzername oder Passwort sind falsch");
mysql_select_db("DB1539594")
or die ("Die Datenbank existiert nicht.");
$q=mysql_query("SELECT * FROM status WHERE ID>'".$_REQUEST['ID']."'");
while($e=mysql_fetch_assoc($q))
$output[]=$e;
print(json_encode($output));
mysql_close();
?>
If you execute the file it looks like this:
[{"ID":"1","name":"tester","status":"1","reports":"5","lastTime":"2014-02-27 17:48:25"}]
My big problem is, that i get a FATAL EXCEPTION: AsyncTask #1
Here's my code:
public class PublicCheck extends Activity {
String URL2;
String result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_public_check);
URL2 = "http://domain.com/real.php";
}
public void check() {
DownloadWebPageTask task = new DownloadWebPageTask();
String x;
task.execute(URL2);
//Log.i("Ergebnis", x+ URL2);
}
class DownloadWebPageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
urls[0]);
try {
HttpResponse response = httpclient.execute(httppost);
result = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
@Override
protected void onPostExecute(String result) {
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","id: "+json_data.getInt("ID")+
", name: "+json_data.getString("name")+
", status: "+json_data.getInt("status")+
", reports: "+json_data.getInt("reports")
);
}
}
catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
}
}
}
I have no idea what i could do. I would be very pleased if you could help me :)
These are the errors.
Try this..
You have given String URL2;
in Global variable and then
In your onCreate
again you have given String URL2 = "http://domain.com/real.php";
Inside check
your called DownloadWebPageTask AsyncTask
x = task.execute(URL2).get();
that URL2
is null then it'll give NPE
Just Remove String
inside onCreate
like URL2 = "http://domain.com/real.php";
check is your http call is returning data proper data or not from debugger. If yes then please use following code for reading string.
HttpResponse response = httpclient.execute(httpget);
EntityUtils.toString(response.getEntity());
dont call this get method on async task
x = task.execute(URL2).get();
replace with
x = task.execute(URL2);
try this for reading data from url
try {
HttpPost httppost = new HttpPost(
urls[0]);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response1 = httpclient.execute(httppost);
if( response1 != null)
{
HttpEntity httpEntity = response1.getEntity();
result = EntityUtils.toString(httpEntity);
}
}
catch (Exception e)
{
Log.e("log_tag", "Error converting result " + e.toString());
}
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