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when click my button app is stop and error in android java

I'm new in android development and am getting this errors when click my "getir" button. It error after work. How to solve this issue
my code code:
public void getir(View view)
{
cursor = myData.rawQuery("SELECT * FROM kolonVeri", null);
int gunIx = cursor.getColumnIndex("gun");
int vtarihIx = cursor.getColumnIndex("vTarih");
cursor.moveToFirst();
while (cursor != null)
{
System.out.println("VARDİYA: " + cursor.getString(gunIx));
System.out.println("TARİH: " + cursor.getString(vtarihIx));
cursor.moveToNext();
}
}
error log
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.hakannacar.vardiyam, PID: 19541
java.lang.IllegalStateException: Could not execute method for android:onClick
om.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.reflect.InvocationTargetException
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
Caused by: android.database.CursorIndexOutOfBoundsException: Index 4 requested, with a size of 4

A returned Cursor (e.g. as from rawQuery) will not be null, the check for null is useless and as shown in this case dangerous.
Rather you should be checking the Cursor move??? methods to see if they return true.
The actual issue is that you end up trying to retrieve data for the 5th row (Index 4) when there are only 4 rows (size), as the check for != null will always be true, so the loop continues beyond the 4th row.
As such your code could be :-
public void getir(View view)
{
cursor = myData.rawQuery("SELECT * FROM kolonVeri", null);
int gunIx = cursor.getColumnIndex("gun");
int vtarihIx = cursor.getColumnIndex("vTarih");
while (cursor.moveToNext()) {
System.out.println("VARDİYA: " + cursor.getString(gunIx));
System.out.println("TARİH: " + cursor.getString(vtarihIx));
}
}

You have to check if the cursor has more items, replace your while loop with this
if (cursor.moveToFirst()) {
do {
System.out.println("VARDİYA: " + cursor.getString(gunIx));
System.out.println("TARİH: " + cursor.getString(vtarihIx));
} while (cursor.moveToNext());
}

Android - Error Input String

Please, i am trying to insert data into my database but i ran into some errors with Android about input string.
Here is my code:
public void addEvent(){
volunteerHandler volunteerHandler = new volunteerHandler(this);
String activity_name = etActivityName.getText().toString();
String location = etLocation.getText().toString();
int date = Integer.parseInt(mydp.getDayOfMonth() + "/" + (mydp.getMonth()+1) + "/" + mydp.getYear());
int time = Integer.parseInt(mytp.getHour() + ":" + mytp.getMinute());
String volunteer_name = etVolunteerName.getText().toString();
volunteerHandler.addVolunteer(activity_name, location, date, time, volunteer_name);
}
Error is:
FATAL EXCEPTION: main
Process: com.igng.ivolunteer, PID: 6375
java.lang.NumberFormatException: For input string: "31/3/2018"
at java.lang.Integer.parseInt(Integer.java:608)
at java.lang.Integer.parseInt(Integer.java:643)
at com.igng.ivolunteer.Dashboard.addEvent(Dashboard.java:125)
at com.igng.ivolunteer.Dashboard$1$1.onClick(Dashboard.java:101)
at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

Look at this error logcat:
java.lang.NumberFormatException: For input string: "31/3/2018"
You can not parse your date into integer, you should save date with string type.

Throwing OutOfMemoryError Android

My Scenario is, I have some data's in Database SQLite. I can get data's Correctly by,
Cursor c0 = OCTDBHelper.myDataBase.rawQuery("SELECT DISTINCT ALIAS FROM ICT32 where ALIAS NOT NULL", null);
Log.i("IC-Count", "IC-Count : " + c0.getCount());
String arr[] =new String[c0.getCount()];
c0.moveToFirst();
for(int i = 0; i < c0.getCount(); i++)
{
arr[i] = c0.getString(0);
c0.moveToNext();
}
here i got all data's correctly in arr like,
arr[0] :abcb,hjhj,jkshdf,hdjf,ghsg,aghgh,
arr[1] : klkl,sdjk,jkji,iui,jiji,jij,
.
.
.
arr[n] : qw,rwer,re,tr,yty,uyu,rtr,ter,etr,yrt,ytr
ie, each location has 10-30 data with comma(,). total arr.length is 1322
after getting that data i need to do some operation with those data as follow as,
I need to split(",") based on comma(,) and add into Single List until array reach n'th position.
Finally my output should be,
list[0] : abcb
list[1] : hjhj
list[2] : jkshdf
...
list[n-1] : yrt
list[n] : ytr
I think already did correctly. but it gives error like Throwing OutOfMemoryError
My code is,
Cursor c0 = OCTDBHelper.myDataBase.rawQuery("SELECT DISTINCT ALIAS FROM ICT32 where ALIAS NOT NULL", null);
Log.i("IC-Count", "IC-Count : " + c0.getCount());
ArrayList<String> tmp = new ArrayList<>();
c0.moveToFirst();
for(int i = 0; i < c0.getCount(); i++)
{
String arr[] = c0.getString(0).split(",");
for(int j= 0; j< arr.length;i++)
{
if(!arr[j].equals(","))
{
tmp.add(arr[j]);
}
}
c0.moveToNext();
}
Log.i("Alias" , "count : " +tmp.size());
this code gives Throwing OutOfMemoryError
Logcat
FATAL EXCEPTION: main
Process: estec.android.mvi32, PID: 11005
java.lang.OutOfMemoryError: Failed to allocate a 103059952 byte allocation with 16777120 free bytes and 58MB until OOM
at java.util.ArrayList.add(ArrayList.java:118)
at estec.android.mvi32.OCTActivity.onOptionsItemSelected(OCTActivity.java:294)
at android.app.Activity.onMenuItemSelected(Activity.java:2882)
at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:353)
at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:144)
at android.support.v7.internal.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:99)
at android.support.v7.app.AppCompatDelegateImplV7.onMenuItemSelected(AppCompatDelegateImplV7.java:541)
at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)
at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:948)
at android.support.v7.internal.view.menu.MenuPopupHelper.onItemClick(MenuPopupHelper.java:187)
at android.widget.AdapterView.performItemClick(AdapterView.java:300)
at android.widget.AbsListView.performItemClick(AbsListView.java:1143)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3044)
at android.widget.AbsListView.onTouchUp(AbsListView.java:3872)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3627)
at android.view.View.dispatchTouchEvent(View.java:8388)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2424)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2158)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2430)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2172)
at android.widget.PopupWindow$PopupViewContainer.dispatchTouchEvent(PopupWindow.java:1682)
at android.view.View.dispatchPointerEvent(View.java:8578)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4021)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3887)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3578)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3635)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3502)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3468)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3476)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3449)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5701)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5675)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5646)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5791)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:143)
at android.os.Looper.loop(Looper.java:122)
at android.app.ActivityThread.main(ActivityThread.java:5253)
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:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
How to resolve this problem??.

This for loop never terminates, look close at the last part:
for(int j= 0; j< arr.length;i++)
Change the i++ to j++ to fix this bug.

NullPointerException in metadata-extractor

I am using metadata-extractor library, to read exif-data from photos in phone.
https://github.com/drewnoakes/metadata-extractor
I wanna get the GPS and some specific tags from metadata, for example:Latitude & Longtitude, focal length. I write code as below:
...
Metadata metadata = ImageMetadataReader.readMetadata(file);
String metaDataString = "" ;
GpsDirectory gpsDirectory = metadata.getFirstDirectoryOfType(GpsDirectory.class);
metaDataString += "Long: " + String.valueOf(gpsDirectory.getGeoLocation().getLongitude()) + "Lat: " + String.valueOf(gpsDirectory.getGeoLocation().getLatitude());
ExifSubIFDDirectory exifSubIFDDirectory = metadata.getFirstDirectoryOfType(ExifSubIFDDirectory.class);
metaDataString += "[focal length]" + exifSubIFDDirectory.getString(ExifSubIFDDirectory.TAG_FOCAL_LENGTH);
...
I received the NullException with code above. Please help me to figure it out. Thanks in advance.
** Add a log **
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.NullPointerException
at com.testing.MetaData.LoadPhoto.doInBackground(LoadPhoto.java:113)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
The NPE error at code line 113 is
metaDataString += "Long: " + String.valueOf(gpsDirectory.getGeoLocation().getLongitude()) + "Lat: " + String.valueOf(gpsDirectory.getGeoLocation().getLatitude());

Cheers guys, you're all right. After debug, I saw some of my photos don't have GPS, and null.
I post the code to control null value as below (this can be also applied for other specific tag)
// Check if metadata contains the specific Directory
if (metadata.containsDirectoryOfType(GpsDirectory.class)) {
GpsDirectory gpsDirectory = metadata.getFirstDirectoryOfType(GpsDirectory.class);
//Check if Directory contains the specific Tag
if(gpsDirectory.containsTag(GpsDirectory.TAG_LATITUDE)&& gpsDirectory.containsTag(GpsDirectory.TAG_LONGITUDE)) {
metaDataString = "[Longtitude]: " + String.valueOf(gpsDirectory.getGeoLocation().getLongitude()) + ", " +
"[Latitude]: " + String.valueOf(gpsDirectory.getGeoLocation().getLatitude()) + ", ";
}
else {
//Show error or notification
}
}
That's it, any concern or better implement, please leave comment.

If your image does not contain GPS data, the returned directory will be null. Be sure to use a null check. Test again with an image that definitely contains GPS data.

Remove extra dots in float value before a separater " , " occurs using java

I am generating a statistical calculator application.
So I want to format input from edittext like this
i/p = 3.5.6, 6.5 to 3.5 , 6.5
Using " , " (comma) as separator so splitting the input string to float array when a " , " occurs.
I want to ignore 3.5[.6] and generate array like this
s[1] = 3.5 , s[2] = 6.5
While calculating mean application crashes due to extra " . " dots.
s = it.getText().toString(); //"it" is edittext
s=s.replaceAll( ",+" , "," );
String[] strarray =s.split(",");
float[] farray = new float[strarray.length];
for(int i = 0; i < strarray.length; i++)
{
farray[i] = Float.parseFloat(strarray[i]);
}
--DEBUG LOGCAT--
W/dalvikvm(3051): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
FATAL EXCEPTION: main
java.lang.NumberFormatException: Invalid float: "6.7."
at java.lang.StringToReal.invalidReal(StringToReal.java:63)
at java.lang.StringToReal.parseFloat(StringToReal.java:310)
at java.lang.Float.parseFloat(Float.java:300)
at com.cal.mc2.Mean$1.onClick(Mean.java:67)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)`
`at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Force finishing activity com.cal.mc2/.Mean

How about this simple function (IdeOne link here: https://ideone.com/utKPjP):
public static float myParseFloat(String str) {
int firstDot = str.indexOf('.');
if (firstDot != -1) {
int secondDot = str.indexOf('.', firstDot+1);
return Float.parseFloat(secondDot == -1 ? str : str.substring(0,secondDot));
}
return Float.parseFloat(str);
}
Then you just replace this statement in your code:
farray[i] = Float.parseFloat(strarray[i]);
with:
farray[i] = myParseFloat(strarray[i]);

You can use regex like this :
public static void main(String[] args) {
String s = "3.5.6, 6.5";
s = s.replaceAll("(?<=\\d\\.\\d)\\.\\d", "");// positive look behind. Only replace `.[digit]` if it is preceeded by [digit][.][digit]
System.out.println(s);
String[] arr = s.split(",");
System.out.println(Arrays.toString(arr));
}
O/P :
3.5, 6.5 --> value of s after replacement
[3.5, 6.5] --> array contents