Teachers: Android beginner tutorial Part 26 AnalogClock and DigitalClock widgets

Tuesday, February 3, 2015

Android beginner tutorial Part 26 AnalogClock and DigitalClock widgets

In this tutorial we will learn about the AnalogClock and DigitalClock widgets.

There are 3 classes related to time in Android SDK - AnalogClock, DigitalClock and Chronometer. They are all subclasses of TextView.

Today well cover the first two widgets. They are very simple to implement and require no java code to implement - just add them in the layout XML and they will work.

Both of these widgets just display time. No other interaction can be performed by default.

Go to activity_main.xml and create a simple layout. Lets add both of the clocks to our application.

The AnalogClock instance:

<AnalogClock android:id="@+id/analogClock"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

And the DigitalClock one:

<DigitalClock android:id="@+id/digitalClock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="48sp"
        />

Full code:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity" >
    
    <AnalogClock android:id="@+id/analogClock"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
    
    <DigitalClock android:id="@+id/digitalClock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="48sp"
        />
    
</LinearLayout>

As you can see, its very easy.

As I already said, both of these classes subclass TextView. This means that all the properties and methods of TextView can be used with these classes. In this example, I set the text size using the android:textSize attribute of the DigitalClock object.

If you run the application, it looks like this:

Thanks for reading!

Teachers

Tuesday, February 3, 2015

Android beginner tutorial Part 26 AnalogClock and DigitalClock widgets

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