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There, errors took from the ActivityManager within the Eclipse Console for the Android plugin and of course some explanations.

The childNodes property allows us to select an element of a node.

For example, we want to retrieve all values of HTML <li> tags inside a <ul> one.

So, let's try it:

In this tutorial of the childElementCount property, we will see how to use it.
It is really easy.
This method returns the number of elements of a node.

Example:

This is the Tuto 2 of the Android tutorial series. You can find the application made here on the Android Market.
Just follow the link on your right.

As the Google Maps API v1 is now obsolete, I could recommend to check this tutorial for the new version of Google Maps API v2.

CharSequence is a native Java Interface.
Its path in the package is android.content.Context.getText(resId)
The class Context extends Object.
We will see this with an Hello World! example.

The following code is an example of how declaring a function with Python 3:

def myFunction(name):
    print("Hello " + name + "!")

Then to use it:

myFunction("YOU")

It will display:

Each Android application has one or more Activities.
Each Activity has a lifecycle.
Each screen we want to use as an interactive component is an Activity.
So this application component must extends the Activity class.