Randy Tong

It known as method reference operator, where it syntax looked like
ClassName::someStaticMethod

Hari Nagarjuna wrote:What is happening in System. out. println()??

dot(s) used to separate class name, field and method.

In this case, out is a class variable of type PrintStream which declared in the System class, while println methods is in class PrintStream.

So we need to use System.out.println to print something out in console.

class System {    public static PrintStream out; } class PrintStream {    public void println ... }

As Paul mentioned, you have error which caused Invalid float: "20.0dip. Are you using it somewhere else?

Hi Jeanne,

I have received the ebook from Mark Power.

Thanks

Please post your xml code

Post relevant code and the errors here.

What language are you using ? A linux command or?

Maybe try add the try/catch around your code.

Did you hint any errors?

Check the url. Did it goes to /allStudents ?

Pedro Sosa wrote:No BubbleDraw2 is the name of the project!
can you help me?

Replace to this
<com.example.bubbledraw2.BubbleView        android:id="@+id/BubbleView"         android:layout_width="match_parent"         android:layout_height="match_parent"/>

Why is Bubbledraw2? You have a class named Bubbledraw2?

When this two appearing on editText? When you long pressed the editText?

You need to have MainActivity class, which inflate with main_activity.xml.

Inside main_activity.xml, add the image view , where the tag is the image view class name, with package name.
<com.your.package.name.BubbleView    android:id="@+id/imgView"    android:layout_width="match_parent"    android:layout_height="match_parent"/>

Thanks! I will reading it cover by cover 😍