MySQL-Verbindung kommt nicht zu stande / keine Reaktion

public class Activity_MySQL extends Activity {
	/** Called when the activity is first created. */


	private TextView resultView;
	@Override
	public void onCreate(Bundle savedInstanceState) {
    	super.onCreate(savedInstanceState);
    	setContentView(R.layout.activity_activity__my_sql);
    	StrictMode.enableDefaults(); //STRICT MODE ENABLED
    	resultView = (TextView) findViewById(R.id.resultView);
    	getData();
	}


	public void getData(){
    	String result = "";
    	InputStream isr = null;
    	try{
        	HttpClient httpclient = new DefaultHttpClient();
        	HttpPost httppost = new HttpPost("IST_NUR_EIN_PLATZHALTER");
        	HttpResponse response = httpclient.execute(httppost);
        	HttpEntity entity = response.getEntity();
        	isr = entity.getContent();
    	}
    	catch(Exception e){
        	Log.e("log_tag", "Error in http connection "+e.toString());
        	resultView.setText("Couldnt connect to database");
    	}
    	//convert response to string
    	try{
        	BufferedReader reader = new BufferedReader(new InputStreamReader(isr,"iso-8859-1"),8);
        	StringBuilder sb = new StringBuilder();
        	String line = null;
        	while ((line = reader.readLine()) != null) {
            	sb.append(line + "\n");
        	}
        	isr.close();


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


    	//parse json data
    	try {
        	String s = "";
        	JSONArray jArray = new JSONArray(result);


        	for(int i=0; i<jArray.length();i++){
            	JSONObject json = jArray.getJSONObject(i);
            	s = s +
                    	"Betreff : "+json.getString("betreff")+" "+json.getString("betreff")+"\n"+
                    	"Text : "+json.getInt("text")+"\n"+
                    	"Datum : "+json.getString("datum")+"\n\n";
        	}


        	resultView.setText(s);


    	} catch (Exception e) {
        	// TODO: handle exception
        	Log.e("log_tag", "Error Parsing Data "+e.toString());
    	}


	}


}