Android UI basic

Basic LinearLayout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >
</LinearLayout>

When this code is saved, the ADK will use the Android Asset Packaging Tool (AAPT) to generate R.java

In Android, a widget is called a View and a layout container like LinearLayout is called a ViewGroup. Above has created an empty ViewGroup

Asking a Question

In order to ask a question, we'll need to add a TextView to the top of the layout. To add this, put the following in between the LinearLayout element.

<TextView
    android:id="@+id/question"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Please wait..."
  />

Now for the answers we're going to want multiple choices. If we use buttons for starters that'll do, but since we can't set a variable number of buttons we'll need to contain them. So let's create a new LinearLayout.

<LinearLayout 
    android:id="@+id/answers"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >
</LinearLayout>

Then, for each button we want something similar to this:

<Button
    android:id="@+id/yes"
    android:text="Yes!"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
/>