Force Close Error On Setonclicklistener (example From Hello Android Book Section 3.5)

I am having problem in starting a new activity on clicking a button, here's my code: package test.project; import android.app.Activity; import android.os.Bundle; import android.co

Solution 1:

Well, you didn't post your logcat output, but since this is such a common beginner's mistake, I'm going to take a wild guess and say that you are probably getting a NullPointerException.

Your call to findViewById is probably returning null, which means that the system could not find the view associated with the id given by R.id.about_content. I would double check your XML layout for typos.

Solution 2:

Odds are you don't have anything with the id about_content in main.xml, which will create a NullPointerException.

Also, if aboutButton is supposed to be a traditional Button, then you should use this:

ButtonaboutButton= (Button) findViewById(R.id.about_content);

Addition

Since aboutButton is a TextView, use this:

TextViewaboutButton= (TextView) findViewById(R.id.about_content);

but this TextView must be in the layout passed to setContentView() or findViewById() will return null.

Solution 3:

That is because the "main.xml" which you have set your content view ... does not contain the about_content TextView, its in the other xml which you have posted ...

Note: You can access only those R.id's which are present in your setContentView(R.layout.yourlayout) xml ...

Solution 4:

you make setContentView(R.layout.main); but main.xml does not include View have id = R.id.about_content. If you raplace by findViewById(R.id.button1); It will work.

Solution 5:

This is the solution for

ButtonaboutButton= (Button)findViewById(R.id.about_content);

And dont forget to add testit Activity in Android Manifest