Animating an image

Teikan · by **Teikan** » Fri Feb 13, 2009 5:55 pm

Before I get flames, yes, i've seen some of the frame by frame tutorials and snippets here, but i can't seem to get them to work.
I want to make a tiny little animated alert icon, and i've tried using the frame by frame code, but i've failed so far.

the code i'm using is this:

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Using xml Syntax Highlighting

<frames id="selected" oneshot="false">
 
    <frame drawable="@drawable/alert_ico" duration="50" />
 
    <frame drawable="@drawable/alert_ico2" duration="50" /> 
 
</frames>
Parsed in 0.001 seconds,  using GeSHi 1.0.8.4

and the java basically this:

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// Load the ImageView that will host the animation and
 
        // set its background to our AnimationDrawable XML resource.
 
        ImageView img = (ImageView)findViewById(R.id.alert_l);
 
        img.setBackgroundResource(R.drawable.alert_ico);
 
        // Get the background, which has been compiled to an AnimationDrawable object.
 
        AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground();     
 
        // Start the animation (looped playback by default).
 
        frameAnimation.start();
 
Parsed in 0.031 seconds,  using GeSHi 1.0.8.4

This is my layout xml code:

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<ImageView
 
                        android:id="@+id/alert_btn"                     
 
                android:layout_width="30px"
 
                android:layout_height="31px"
 
                android:layout_alignParentRight="true"
 
                android:src="@+id/alert_l"
 
                />
Parsed in 0.001 seconds,  using GeSHi 1.0.8.4

I get no errors compiling but the app just crashes.
If someone can explain what i'm doing wrong i'd be most appreciative, or point me to a tutorial.

Haibane · by **Haibane** » Wed Feb 25, 2009 10:09 am

Check the logCat for the error, it gives you hint what to fix

mdownie · by **mdownie** » Thu Mar 05, 2009 3:37 pm

I think you are using the wrong ID from your XML layout. Try this code instead:

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// Load the ImageView that will host the animation and
 
        // set its background to our AnimationDrawable XML resource.
 
        ImageView img = (ImageView)findViewById(R.id.alert_btn);
 
        img.setBackgroundResource(R.drawable.alert_ico);
 
        // Get the background, which has been compiled to an AnimationDrawable object.
 
        AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground();    
 
        // Start the animation (looped playback by default).
 
        frameAnimation.start(); 
Parsed in 0.032 seconds,  using GeSHi 1.0.8.4

I think you were using the image name for ImageView object instead of the appropriate ImageView ID from the XML.

Animating an image

Animating an image

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