Caldroid işlev kümesi üzerinde NullPointExceptionBackgroundDrawableForDate

Question

Android App'im içinde özel bir takvim oluşturmak için Caldroid Lib kullanıyorum, setBackgroundDrawableForDate'da bir tarih değeri yüklerken aşağıdaki kod satırlarını kullanıyorum.

public class CaldroidSample extends AppCompatActivity { 

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

    CaldroidFragment caldroidFragment = new CaldroidFragment(); 
    Bundle args = new Bundle(); 
    Calendar cal = Calendar.getInstance(); 
    args.putInt(CaldroidFragment.MONTH, cal.get(Calendar.MONTH) + 1); 
    args.putInt(CaldroidFragment.YEAR, cal.get(Calendar.YEAR)); 

    caldroidFragment.setArguments(args);caldroidFragment.setBackgroundDrawableForDate(new ColorDrawable(Color.GREEN), ParseDate("28/04/2016")); 

    getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, caldroidFragment).commit(); 

} 

public Date ParseDate(String date_str) 
{ 
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
      "yyyy-MM-dd", Locale.getDefault()); 
    Date dateStr = null; 
    try { 
     dateStr = simpleDateFormat.parse(date_str); 
    } catch (ParseException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    return dateStr; 
} 

} 

Aşağıdaki hatayı alıyorum, sorunun ne olduğunu bilmiyorum.

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vv.melioring.calendarapp/com.vv.melioring.calendarapp.CaldroidSample}: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.util.Date.getTime()' on a null object reference 

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413) 
at android.app.ActivityThread.access$800(ActivityThread.java:155) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5343) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700) 
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'long java.util.Date.getTime()' on a null object reference 
at java.util.Calendar.setTime(Calendar.java:1195) 
at com.roomorama.caldroid.CalendarHelper.convertDateToDateTime(CalendarHelper.java:112) 
at com.roomorama.caldroid.CaldroidFragment.setBackgroundDrawableForDate(CaldroidFragment.java:433) 
at com.vv.melioring.calendarapp.CaldroidSample.onCreate(CaldroidSample.java:66) 
at android.app.Activity.performCreate(Activity.java:6010) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)  
at android.app.ActivityThread.access$800(ActivityThread.java:155)  
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)  
at android.os.Handler.dispatchMessage(Handler.java:102)  
at android.os.Looper.loop(Looper.java:135)  
at android.app.ActivityThread.main(ActivityThread.java:5343)  
at java.lang.reflect.Method.invoke(Native Method)  
at java.lang.reflect.Method.invoke(Method.java:372)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)  

Answer 1

tarihiniz 28/04/2016 olduğunu ve yyyy-MM-dd ile ayrıştırmak deneyin. dd/MM/yyyy olarak değiştirin.

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());