مشکل در اکتیویتی لطفا کمک کنید

اکتیویتی دوم

public class AddActivity extends Activity implements OnClickListener {

    EditText                           etmsg;

    DateFormat                         fmtDateAndTime = DateFormat.getDateTimeInstance();
    TextView                           lblDateAndTime;
    Calendar                           myCalendar     = Calendar.getInstance();

    DatePickerDialog.OnDateSetListener d              = new DatePickerDialog.OnDateSetListener() {

                                                          @Override
                                                          public void onDateSet(DatePicker view, int year, int monthOfYear,
                                                                                int dayOfMonth) {
                                                              myCalendar.set(Calendar.YEAR, year);
                                                              myCalendar.set(Calendar.MONTH, monthOfYear);
                                                              myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                                                              updateLabel();
                                                          }
                                                      };

    TimePickerDialog.OnTimeSetListener t              = new TimePickerDialog.OnTimeSetListener() {

                                                          @Override
                                                          public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                                                              myCalendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
                                                              myCalendar.set(Calendar.MINUTE, minute);
                                                              updateLabel();
                                                          }
                                                      };


    private void updateLabel() {
        lblDateAndTime.setText(fmtDateAndTime.format(myCalendar.getTime()));
    }

    Button date, time;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_layout);
        // TODO Auto-generated method stub

        etmsg = (EditText) findViewById(R.id.etmsg);

        lblDateAndTime = (TextView) findViewById(R.id.tvdatetime);
        date = (Button) findViewById(R.id.btndate);
        date.setOnClickListener(this);

        time = (Button) findViewById(R.id.btntime);
        time.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch (v.getId()) {
            case R.id.btndate:
                new DatePickerDialog(AddActivity.this, d, myCalendar
                        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
                        myCalendar.get(Calendar.DAY_OF_MONTH)).show();
                break;

            case R.id.btntime:
                new TimePickerDialog(AddActivity.this, t, myCalendar
                        .get(Calendar.HOUR_OF_DAY), myCalendar
                        .get(Calendar.MINUTE), true).show();
                break;
        }
    }

}

public class MainActivity extends Activity {

    /** Called when the activity is first created. */

    Button btnadd;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnadd = (Button) findViewById(R.id.btnjadid);
        btnadd.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent i = new Intent(MainActivity.this, AddActivity.class);

                startActivity(i);
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="mozhgan.Teset"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".AddActivity"></activity>
    </application>

</manifest>