Android Studio - DatePicker in AlertDialog, null object reference

Android Studio - DatePicker in AlertDialog, null object reference

By : Gail Stout
Date : November 21 2020, 03:00 PM
Any of those help Your problem is that your findViewById is looking in the wrong place for the DatePicker view. Calling findViewById in an activity will call it on the Activity's layout hierarchy, not the dialog's layout. You need to inflate the layout for the alert dialog first, and then get a reference to the view. This can be acheived in a couple ways.
Probably the easiest is to inflate the view and get the reference before showing the dialog:
code :
View dialogView = LayoutInflater.from(this).inflate(R.layout.activity_alertdialog_date, false);
DatePicker datePicker = (DatePicker) dialogView.findViewById(R.id.Activity_AlertDialog_SetStartDate);

AlertDialog.Builder alert  = new AlertDialog.Builder(this);
//  ... The rest of the AlertDialog, with buttons and all that stuff
AlertDialog.Builder alert  = new AlertDialog.Builder(this);
//  ... The rest of the AlertDialog, with buttons and all that stuff
AlertDialog dialog = alert.create();

DatePicker datePicker = (DatePicker) dialog.findViewById(R.id.Activity_AlertDialog_SetStartDate);

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android studio java.langNullPointerException null object reference

android studio java.langNullPointerException null object reference

By : user3041124
Date : March 29 2020, 07:55 AM
will help you Your paintLayout is null, and your problem is onCreate(). When overriding methods from a super class, you should always (most of the times) call the method from that class using super.method(), to allow normal processing.
Also, you are missing a call to setContentView(R.layout.your_layout) . So don't forget these two lines:
code :
protected void onCreate(Bundle savedInstanceState) {

    drawView = (DrawingView)findViewById(R.id.drawing);
    LinearLayout paintLayout = (LinearLayout)findViewById(R.id.paint_colors);
    currPaint = (ImageButton)paintLayout.getChildAt(0);
Null Object Reference Error: Android Studio using SQLite

Null Object Reference Error: Android Studio using SQLite

By : tttttianchao
Date : March 29 2020, 07:55 AM
wish helps you This is very likely because you didn't register your AppController in the manifest so getInstance returns null.
Custom method for AlertDialog throws "Attempt to invoke ... on a null object reference" Android

Custom method for AlertDialog throws "Attempt to invoke ... on a null object reference" Android

By : Alexey Cheremisin
Date : March 29 2020, 07:55 AM
hop of those help? You are calling those setters when views are not initialized. onCreate() method is called when show() method is called. but these setters are being called before show method. that is causing that error.
If you want to set those values from mainActivity you have to make interface to get those values or send data in constructor.
code :
public Activity c;
        public Dialog d;
        public Button close;
        public ImageView pImage;
        public TextView title;
        public TextView utensils;
        public TextView preparation;

        // variables those will handle values. i did not implement it for image you can do same for that also.
        private String titleValue;
        private String utensilsValue;
        private String preparationValue;

        public ProductDialog(Activity a) {
            // TODO Auto-generated constructor stub 
            this.c = a;

        protected void onCreate(Bundle savedInstanceState) {
            close = (Button) findViewById(R.id.popClose);
            pImage = (ImageView) findViewById(R.id.popImg);
            title = (TextView) findViewById(R.id.popTitle);
            utensils = (TextView) findViewById(R.id.popUtensili);
            preparation = (TextView) findViewById(R.id.popPreparazione);

        public void onClick(View v) {
            switch (v.getId()) {
            case R.id.popClose:

        public void setImage(String urlImg) {
              //.transform(new RoundedTransformation(10, 0)) 

    // Created  getter and setter to get get value form mainActivity. 
        public void setTitle(String txtTitle) {
            titleValue = (txtTitle);
        public void setUtensils(String txtUtensils) {
            utensilsValue = (txtUtensils);
        public void setPreparation(String txtPreparation) {
            preparationValue = (txtPreparation);
android studio media player null object reference

android studio media player null object reference

By : agehack
Date : March 29 2020, 07:55 AM
Does that help Most likely audio format is not being supported. You can use 8bit and 16bit linear PCM. Here is more information on supported media formats:supported media formats
The solution is to re-encode the mp3 files.
Android studio - Rider.getName()' on a null object reference

Android studio - Rider.getName()' on a null object reference

By : reader31
Date : March 29 2020, 07:55 AM
help you fix your problem Like i thought, the issue is your Rider model class which I couldn't see such related array or data in the Firebase json output. But i saw : DriversInformation
First, go to Firebase console from which your data(s) are available and copy-paste the output json to this website:
code :
ResultPojo result = dataSnapshot.getValue(ResultPojo.class);
ArrayList<String> names= new ArrayList<>();
for(DataSnapshot ds : dataSnapshot.getChildren()) {

             // blop blop ... do some magic with ds
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