Unfortunately app has been stopped in this,how to solve

Question

public class MainActivity extends ActionBarActivity {

    TextView textView1, Btrylevel;

    private Intent intent;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Postdata();

    }

    public void Postdata() {

        TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

        textView1 = (TextView) findViewById(R.id.textView1);

        final String Imei = tm.getDeviceId();

        textView1.setText("IMEI NUMBER  " + Imei);

      Btrylevel=(TextView)this.findViewById(R.id.textView2);

        BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {

            public void onReceive(Context context, Intent intent) {

                context.unregisterReceiver(this);

                int rawlevel = intent.getIntExtra("level", -1);

                int scale = intent.getIntExtra("scale", -1);

                int level = -1;

                if (rawlevel >= 0 && scale > 0) {

                    level = (rawlevel * 100) / scale;

                }

                Btrylevel.setText("Battery Level: " + level + "%");

            }

        };

        IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);

        registerReceiver(batteryLevelReceiver, batteryLevelFilter);

            // Create a new HttpClient and Post Header

            HttpClient httpclient = new DefaultHttpClient();

            HttpPost httppost = new HttpPost("http://10.0.2.2/api/IMeis");

            try {

                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(3);

                nameValuePairs.add(new BasicNameValuePair("IMei", Imei));

                nameValuePairs.add(new BasicNameValuePair("Btrylevel",Btrylevel.toString()));

                 httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                HttpResponse response = httpclient.execute(httppost);

            } catch (ClientProtocolException e) {

                // TODO Auto-generated catch block

            } catch (IOException e) {

                // TODO Auto-generated catch block

            }

    }

}