Im making an app that uses the internet to retrive information. I get an NetworkOnMainThreadException as i tried to run it on 3.0 and above and have therefore tried to set it up using AsyncTask, but it still gives the exception and i don't know what is wrong. Oddly enough i read on this thread Android NetworkOnMainThreadException inside of AsyncTask that if you just removes the android:targetSdkVersion="10" statement from the manifest file it will be able to run. This works but i don't find it as the right solution to solve the problem this way. So if anyone can tell me what im doing wrong with the AsyncTask i will really appriciate it. Also if there is anybody that knows why removing the statement in the manifest makes it work, im really interested in that also.

My code looks like this:

public class MainActivity extends Activity {

static ArrayList<Tumblr> tumblrs;
ListView listView;
TextView footer;
int offset = 0;
ProgressDialog pDialog;
View v;
String responseBody = null;
HttpResponse r;
HttpEntity e;
String searchUrl;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    final ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {

        setContentView(R.layout.main);

        try {
            tumblrs = getTumblrs();
            listView = (ListView) findViewById(R.id.list);
            View v = getLayoutInflater().inflate(R.layout.footer_layout,
                    null);
            footer = (TextView) v.findViewById(R.id.tvFoot);
            listView.addFooterView(v);
            listView.setAdapter(new UserItemAdapter(this, R.layout.listitem));

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        new GetChicks().execute();
        footer.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                new loadMoreListView().execute();
            }
        });

    } else {
        setContentView(R.layout.nonet);

    }

}

public class UserItemAdapter extends ArrayAdapter<Tumblr> {

    public UserItemAdapter(Context context, int imageViewResourceId) {
        super(context, imageViewResourceId, tumblrs);

    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {

            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.listitem, null);

        }

        Tumblr tumblr = tumblrs.get(position);
        if (tumblr != null) {

            ImageView image = (ImageView) v.findViewById(R.id.avatar);

            if (image != null) {
                image.setImageBitmap(getBitmap(tumblr.image_url));

            }
        }

        return v;
    }
}

public Bitmap getBitmap(String bitmapUrl) {
    try {
        URL url = new URL(bitmapUrl);
        return BitmapFactory.decodeStream(url.openConnection()
                .getInputStream());
    } catch (Exception ex) {
        return null;
    }
}

public ArrayList<Tumblr> getTumblrs() throws ClientProtocolException,
        IOException, JSONException {
    searchUrl = "http://api.tumblr.com/v2/blog/"webside"/posts?api_key=API_KEY";

    ArrayList<Tumblr> tumblrs = new ArrayList<Tumblr>();
    return tumblrs;
}

private class GetChicks extends AsyncTask<Void, Void, Void> {

    @Override
    protected Void doInBackground(Void... unused) {
        // TODO Auto-generated method stub
        runOnUiThread(new Runnable() {
            public void run() {

                HttpClient client = new DefaultHttpClient();
                HttpGet get = new HttpGet(searchUrl);

                HttpResponse r = null;
                try {
                    r = client.execute(get);
                    int status = r.getStatusLine().getStatusCode();
                    if (status == 200) {
                        e = r.getEntity();
                        responseBody = EntityUtils.toString(e);
                    }
                } catch (ClientProtocolException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                } catch (IOException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }

                JSONObject jsonObject;
                try {
                    jsonObject = new JSONObject(responseBody);

                    JSONArray posts = jsonObject.getJSONObject("response")
                            .getJSONArray("posts");

                    for (int i = 0; i < posts.length(); i++) {
                        JSONArray photos = posts.getJSONObject(i)
                                .getJSONArray("photos");
                        for (int j = 0; j < photos.length(); j++) {
                            JSONObject photo = photos.getJSONObject(j);
                            String url = photo.getJSONArray("alt_sizes")
                                    .getJSONObject(0).getString("url");

                            Tumblr tumblr = new Tumblr(url);
                            tumblrs.add(tumblr);

                        }
                    }

                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        });

        return null;
    }

}

public class Tumblr {

    public String image_url;

    public Tumblr(String url) {

        this.image_url = url;

    }
}

private class loadMoreListView extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        // Showing progress dialog before sending http request
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("More chicks coming up..");
        pDialog.setIndeterminate(true);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    @Override
    protected Void doInBackground(Void... unused) {
        // TODO Auto-generated method stub
        runOnUiThread(new Runnable() {
            public void run() {
                // increment current page
                offset += 2;

                // Next page request
                tumblrs.clear();
                String searchUrl = "http://api.tumblr.com/v2/blog/"webside"/posts?api_key=API_KEY&limit=2                       + offset;

                HttpClient client = new DefaultHttpClient();
                HttpGet get = new HttpGet(searchUrl);

                HttpResponse r = null;
                try {
                    r = client.execute(get);
                    int status = r.getStatusLine().getStatusCode();
                    if (status == 200) {
                        HttpEntity e = r.getEntity();
                        responseBody = EntityUtils.toString(e);
                    }
                } catch (ClientProtocolException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                } catch (IOException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }

                JSONObject jsonObject;
                try {
                    jsonObject = new JSONObject(responseBody);

                    JSONArray posts = jsonObject.getJSONObject("response")
                            .getJSONArray("posts");

                    for (int i = 0; i < posts.length(); i++) {
                        JSONArray photos = posts.getJSONObject(i)
                                .getJSONArray("photos");
                        for (int j = 0; j < photos.length(); j++) {
                            JSONObject photo = photos.getJSONObject(j);
                            String url = photo.getJSONArray("alt_sizes")
                                    .getJSONObject(0).getString("url");

                            Tumblr tumblr = new Tumblr(url);
                            tumblrs.add(tumblr);

                        }
                    }

                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                // Setting new scroll position
                listView.setSelectionFromTop(0, 0);

            }
        });

        return null;
    }

    protected void onPostExecute(Void unused) {
        pDialog.dismiss();

    }

}

@Override
public boolean onCreateOptionsMenu(android.view.Menu menu) {
    // TODO Auto-generated method stub
    super.onCreateOptionsMenu(menu);
    MenuInflater blowUp = getMenuInflater();
    blowUp.inflate(R.menu.cool_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
    switch (item.getItemId()) {
    case R.id.aboutUs:
        Intent i = new Intent("com.example.example.ABOUT");
        startActivity(i);

        break;
    case R.id.refresh:
        Intent f = new Intent(MainActivity.this, MainActivity.class);
        startActivity(f);
        finish();
        break;
    case R.id.exit:
        finish();
        break;
    }
    return false;
}

}

Thanks for helping out.