Android Studio 3.1.3 recognizes as "null my images"

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Android Studio 3.1.3 recognizes as "null my images"

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When I try to reference an image from the code of an activity I get the problem:

java.lang.RuntimeException: Unable to start activity ComponentInfo {com.example.deybin.figuremapsearching / com.example.deybin.figuremapsearching.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource (int) 'on a null object reference

This is the main problem:

Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource (int) 'on a null object reference

I would really appreciate any response

I have my Image View, and I also have it linked to my xml.

I suspect that my problem is: Compatibility or maybe depending on the place in the code where you referred them.

I will not include the code that you request because I consider it has no purpose, thank you very much

java android android-imageview

asked by Deybi Cocluso 22.10.2018 в 02:52

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3 answers

Xpath with java, extract name Hello, I would like to know why the form (in java) shows the data in null

score 1 · Answer 1

Actually the problem is not the images, it is the view which does not exist, to get the reference of the view, in this case the ImageView , this does not exist therefore you can not load the images using setImageResource() :

ImageView.setImageResource(int)

You may not be getting the ImageView reference through findViewById() or the layout where you are looking for the reference, there is no ImageView .

Add how you get the reference and your layout to expand the answer.

score 0 · Answer 2

Check the layout that loads the activity that is correct, since the error that shows you

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource (int) 'on a null object reference

Tells you that the object is null, so you can not operate with it.

As an alternative, I see that you have just upgraded android studio

File\Invalidate Caches and Restart and recompile

score 0 · Answer 3

ImageView probelma;

@Oberride Oncreate (....... { { Problem = (ImageView) findViewbyId (R.id.iVisormagen); }

Public void unaFuncion (View view) { While (condition) { If (condition) {} else { switch (value) { Case (1): { Probelma.setImageResource (R.drawable.laimagen); // I've also tried the setImageDrawable // Getting the same exception.

               // en mi carpeta( res/drawables) tengo mi png "laimagen".

This is the context in which I received the problem.

Thank you very much to all who have responded. I regret that I did not include the code from the beginning. I added the schema