CODEWITHSUNDEEP
androidxamarin.android
Dumbo
Dumbo

Reputation: 14112

Changing image of ImageButton on press and release

In Mono For Android, I have an ImageButton and I want to change its image while user is holding the button. And when user release the button image should change to pervious image. I am trying with the code below but nothing happens:

    private void _goForward_KeyPress(object sender, View.KeyEventArgs e)
    {
        if(e.Event.Action == KeyEventActions.Down)
        {
            _goForward.SetImageResource(Resource.Drawable.arrowUpGreen);
             //Then do some stuff
        }
        else
        {
            _goForward.SetImageResource(Resource.Drawable.arrowUpRed);
            //Then do some stuff
        }
    }

I am not sure if I am doing this with the right event. What event usualy should be used in this case?

Upvotes: 1

Views: 2158

Answers (2)

Greg Shackles
Greg Shackles

Reputation: 10139

You need to attach your method to the button's KeyPress event for it to be called, since the wiring doesn't happen automatically:

_goForward.KeyPress += _goForward_KeyPress;

EDIT

Oops, I should have read the question a little more closely the first time. Since you're trying to hook into when the button is touched, you want the Touch event instead:

_goForward.Touch += _goForward_Touch;

and

private void _goForward_Touch(object sender, View.TouchEventArgs touchEventArgs)
{
    if (touchEventArgs.Event.Action == MotionEventActions.Down)
    {
        Toast.MakeText(this, "down", ToastLength.Short).Show();
    }
    else
    {
        Toast.MakeText(this, "up", ToastLength.Short).Show();
    }
}

Upvotes: 1

Narendra Pal
Narendra Pal

Reputation: 6604

Try this:

Use the selector for this

Say its name as: background_drawable.xml

<selector
    xmlns:android="http://schemas.android.com/apk/res/android">     
    <item       
        android:drawable="@drawable/YOUR_IMAGE_WHEN_PRESSED"
        android:state_pressed="true" />
    <item
        android:drawable="@drawable/YOUR_IMAGE_WHEN_FOCUSED"
        android:state_focused="true" />
    <item
        android:drawable="@drawable/YOUR_IMAGE_WHEN_NOT_ENABLED"
        android:state_enabled="false" 
        />
    <item
        android:drawable="@drawable/DEFAULT_IMAGE_WHICH_YOU_WANT_ALWAYS" />
</selector>

And in you main.xml file

<ImageButton 
            android:background="@drawable/background_drawable"/>

Upvotes: 5

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