[Solved] How to open an Image from on Itemclick listener

by


Your error itself gives answer of your question.

requestFeature() must be called before adding content

That means your second Activity needs this change 

requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main4);

requestWindowFeature() must be before setContentView()

After your updated question

now your error is 

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference

you need to check this What is a Null Pointer Exception, and how do I fix it?

solved How to open an Image from on Itemclick listener