android imageview onClick动画

Question

I guess this is kind of an odd question but I have tried setting onClicklistener on an ImageView and it has worked. But the problem is that the user cannot sense the click. I mean if some of u have worked on other mobile environs(like Apple iPhone) then when we click on an Image in other environs then it gives an effect on the image so that the user can understand that the image has been clicked.

I have tried setting alpha using setalpha method but it doesn't work. Though the same thing is working fine on onFocusListener implementation. Can some1 suggest a different way to modify the image on click...

I am new to android so haven't learnt the nuances of simple animation also... if there is any simple animation I can use for the same then please let me know.

Thanks!

Answer 1

   <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

<alpha
android:fromAlpha = "1.0"
android:toAlpha = "0.5"
android:duration = "300">
</alpha>
<scale
android:fromXScale = "1"
android:toXScale = "0.9" 
android:fromYScale = "1"
android:toYScale = "0.9" 
android:pivotX="50%"
android:pivotY="50%" 
android:duration = "50">
</scale>
</set>

I don't know if this is the correct method but defining an animation as mentioned did the trick. Now we just have to give

public void onClick(View v) {
v.startAnimation(AnimationUtils.loadAnimation(Context, R.anim.image_click));
//Your other coding if present
}

in the OnClick method and the change will be visible...

Answer 2

You'll want to use a drawable that contains different images for the different states you want to support. Here's an example:

<?xml version="1.0" encoding="utf-8"?>    
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@drawable/img_pressed" />
    <item android:state_focused="true" android:drawable="@drawable/img_focused" />
    <item android:drawable="@drawable/img_at_rest" />
</selector>

Name this file img.xml or something and put it in your drawable directory, then set your ImageView's image to img.xml. @drawable/img_at_rest is the original image you're trying to use, while @drawable/img_pressed and @drawable/img_focused are the images to use for their respective states. You can also use solid colors instead of images if it's appropriate for your use case.

Answer 3

anim/anim_item.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <alpha
    android:fromAlpha="0.0"
    android:toAlpha="1."
    android:duration="1000">
  </alpha>
</set>

And add:

myView.startAnimation(AnimationUtils.loadAnimation(context, R.anim.anim_item));

Answer 4

不确定它是否有效，但你试过setSelected（） http://developer.android.com/reference/android/widget/ImageView.html#setSelected ( boolean）