Im trying to pick date after clicking on button and setting its value on TextView. This thread helped Datepicker: How to popup datepicker when click on button and store value in variable
But im unable to set value of datepicker on setText,the textview object v returns empty nullpointerexception.
v.setText(new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("/").append(mDay).append("/")
.append(mYear).append(" "));
System.out.println(v.getText().toString());
Any help is appreciated
Full code: Mainactivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void pick(View v){
Calendar c = Calendar.getInstance();
int mYear = c.get(Calendar.YEAR);
int mMonth = c.get(Calendar.MONTH);
int mDay = c.get(Calendar.DAY_OF_MONTH);
System.out.println("the selected " + mDay);
DatePickerDialog dialog = new DatePickerDialog(MainActivity.this,
new mDateSetListener(), mYear, mMonth, mDay);
dialog.show();
}
}
class mDateSetListener implements DatePickerDialog.OnDateSetListener {
private TextView v;
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// TODO Auto-generated method stub
// getCalender();
int mYear = year;
int mMonth = monthOfYear;
int mDay = dayOfMonth;
v.setText(new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("/").append(mDay).append("/")
.append(mYear).append(" "));
}
}
xml file:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.datesamp.MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="101dp"
android:text="Pick date"
android:onClick="pick"/>
<TextView
android:id="@+id/t1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
/>
</RelativeLayout>
You need to initialize the variable v before using it in onDateSet(), e.g. adding the following statement before v.setText(...):
But in order to insert this statement inside onDateSet(), I suggest you to define the class mDateSetListener as an inner class inside MainActivity, it will make your life easier.