Can you use PNG's? I attempted too use a png and got a failed to convert into a drawable. Help please.

You can totally use a PNG in Android. In fact, it's recommended over jpeg or gif.

Android's picky about the filename, so you need to make sure there's no uppercase letters or spaces in the name.

You can put the PNG in the drawable folder - any of them will work, but you need to be conscious of the pixel density of the screen - xhdpi, hdpi, mdpi, ldpi (xtra high, high, medium, and low respectively).

You can access the file with the R.drawable object in Android - for example:

Filename: mypicture.png

Access with: R.drawable.mypicture

If you're setting it dynamically with code, you can use the imageView.setImageResource method:

ImageView myImageView = (ImageView) findViewById(R.id.your_imageview_id);
myImageView.setImageResource(R.drawable.mypicture);

Or if you're doing it from the XML Layout file, You can use the GUI to do it, but I prefer the text editor. It will look something like this:

<ImageView
                android:layout_width="150dp"
                android:layout_height="150dp"
                android:id="@+id/imageView4"
                android:background="@drawable/mypicture"
                android:layout_below="@+id/textView2"
                android:layout_alignLeft="@+id/textView2"
                android:layout_alignStart="@+id/textView2"
                />
<!-- Note: I'm using RelativeLayout -->

Hope this helps!