Question

I have one ImageView on a home screen widget , currently the image is static.
But I want to make that image flash, like ON and OFF automatically.

The image is keep flashing green -> red -> green like a siren.

Initially Image is Red

User Taps over Red Image , it stars flashing from Red to Green rapidly

User Tags again it stops flashing and set to Red

Thanks in advance

Answer 1

You can do this with a ViewFlipper in XML. To start/stop the flashing you can use the remoteview method setViewVisibility() to toggle between redOnly and redAndGreen.

<FrameLayout
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" >

<ImageView
    android:id="@+id/redOnly"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:src="@drawable/red" />

<ViewFlipper
    android:id="@+id/redAndGreen"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:animateFirstView="false"
    android:autoStart="true"
    android:flipInterval="700"
    android:measureAllChildren="true">

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@drawable/green" />

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@drawable/red" />
</ViewFlipper>