Pop-Up Window-Continues to crash

Question

I am trying to make a PopupWindow to explain my app, however I am having a lot of difficulty for a seemingly simple thing. I tried various youtube videos and looked at almost all the similar posts on here about it, but I haven't had any luck yet. If someone can please point out my flaw, that'd be great.

My end goal is for the PopupWindow to appear with the on create method, but I included a Button to start it for now because all the tutorials included one.

 protected void onCreate(Bundle savedInstanceState) {
    //BUILDING THE POP UP WINDOW ON CLICK OF HELP BUTTON

    help=(Button)findViewById(R.id.help);
    help.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            layoutInflater=(LayoutInflater)getBaseContext().getSystemService(LAYOUT_INFLATER_SERVICE);
            View customView= layoutInflater.inflate(R.layout.activity_instructions, null);

            popUpWindow=new PopupWindow(
                    customView,
                    RelativeLayout.LayoutParams.WRAP_CONTENT,
                    RelativeLayout.LayoutParams.WRAP_CONTENT
            );
            myButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    popUpWindow.dismiss();
                }
            });
        }
    });

Any help would be greatly appreciated. If I need to include any more information, please do ask. I am new to android and this is my first big Application so keeping my hopes up.

Thanks The link to my log

07-30 23:32:07.062 9273-9273/my.myCompany.vinay.diversityformulaapplication E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                              Process: my.myCompany.vinay.diversityformulaapplication, PID: 9273
                                                                                              java.lang.RuntimeException: Unable to start activity ComponentInfo{my.myCompany.vinay.diversityformulaapplication/my.myCompany.vinay.diversityformulaapplication.EntryScreen}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
                                                                                                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2947)
                                                                                                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008)
                                                                                                  at android.app.ActivityThread.-wrap14(ActivityThread.java)
                                                                                                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
                                                                                                  at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                                  at android.os.Looper.loop(Looper.java:154)
                                                                                                  at android.app.ActivityThread.main(ActivityThread.java:6688)
                                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
                                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
                                                                                               Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
                                                                                                  at my.myCompany.vinay.diversityformulaapplication.EntryScreen.onCreate(EntryScreen.java:37)
                                                                                                  at android.app.Activity.performCreate(Activity.java:6912)
                                                                                                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
                                                                                                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2900)
                                                                                                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008) 
                                                                                                  at android.app.ActivityThread.-wrap14(ActivityThread.java) 
                                                                                                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650) 
                                                                                                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                                  at android.os.Looper.loop(Looper.java:154) 
                                                                                                  at android.app.ActivityThread.main(ActivityThread.java:6688) 
                                                                                                  at java.lang.reflect.Method.invoke(Native Method) 
                                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
                                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

Refer to [this tutorial](https://www.javatpoint.com/android-popup-menu-example). — Abhi, Jul 31 '17 at 02:00
You can find the log by following the instruction here: https://stackoverflow.com/questions/19784877/how-to-find-the-logs-on-android-studio — Abdul Rahman A Samad, Jul 31 '17 at 02:03
Abhi, I did the entire tutorial redoing all the code, and I got the same result. It continues to crash... — bobthebuilder, Jul 31 '17 at 02:40
you should paste the log here. I can't seem to open that link. — Abdul Rahman A Samad, Jul 31 '17 at 02:47
please have your logcat open when you touch your `help` button, your log will display the exception - copy/paste that — TWL, Jul 31 '17 at 03:27
Possible duplicate of [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Henry, Jul 31 '17 at 04:45

score 0 · Answer 1 · answered Jul 31 '17 at 04:43

0

myButton is null here.
you are missing this

myButton = (Button)customView.findViewById(R.id.myButtonId);

answered Jul 31 '17 at 04:43

Android jack - Rajesh Gosemath

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Pop-Up Window-Continues to crash

1 Answers1