Nullpointerexception:Println Needs a Message in Android

java.lang.NullPointerException: println needs a message

Maybe when you call

Log.d("sql_id", cursor.getString(0));

cursor.getString(0) returns null, and then it crashes.

Try :

if(cursor.getString(0) != null) {
    Log.d("sql_id", cursor.getString(0)); 
}

Otherwise, show us: de.bodprod.dkr.BosLstDetailMap.onCreate(BosLstDetailMap.java:43)

NullPointerException : println needs a message in android

In the catch, use:

String err = (ex.getMessage()==null)?"SD Card failed":ex.getMessage();
Log.e("sdcard-err2:", err);

Passing null to the second argument of a Log logging function throws that error, regardless of the source.

Android: NullPointerException: println needs a message;

Log.d("ReadRdaJSONFeedTask", e.getLocalizedMessage());,

The e.getlocalizedMessage() is returning null. Check before calling.

Log.d("ReadRdaJSONFeedTask", e.getLocalizedMessage() == null ? "" : e.getLocalizedMessage());

NullPointerException: println needs a message

Your error is pretty obvious

E/AndroidRuntime(909): java.lang.NullPointerException: println needs a message 02-27 11:03:42.058:

You must provide a message for a log message. It cannot be null.

Log.i(course.getcoursename(), null);

Should be

Log.i(course.getcoursename(), "Some not null string");

How to fix 'println needs a message' error on android

SlideshowFragment can take string as argument is not bundle.

SlideshowFragment slideshowFragment = SlideshowFragment.newInstance(sb.toString());

println needs a message error in android

When you execute a query against the Firebase Database, there will potentially be multiple results. So the snapshot contains a list of those results. Even if there is only a single result, the snapshot will contain a list of one result.

The code in your onDataChange will need to handle this list by looping over dataSnapshot.getChildren(). Something like this:

DatabaseReference plist = dref.child("Playlist");
plist.orderByChild("Playlist_ID").equalTo(2).addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        for (DataSnapshot snapshot: dataSnapshot.getChildren()) { // Loop over results
            String music_id = snapshot.child("Music_ID").getValue(String.class); // Get value for this result
            Log.i("Value_id", music_id);
            str_musictitle.setText(music_id);
        }
    }

    @Override
    public void onCancelled(@NonNull DatabaseError error) {
        throw error.toException(); // Never ignore possible errors
    }
});