How to animate layout from top to 300dp of screen vice versa in android?

Question

Requirement

I can translate layout base on toYDelta="100% or toYDelta="50% etc.

But I want to animate layout only in 300dp Height.

slide_down.xml

<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromYDelta="0"
    android:toYDelta="100%" />

slide_up.xml

<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromYDelta="100%"
    android:toYDelta="0" />

Java Code (Animation)

Animation animation = AnimationUtils.loadAnimation(getActivity().getApplicationContext(),R.anim.slide_down);
animation.setAnimationListener(new AnimationListener() {

    @Override
    public void onAnimationStart(Animation animation) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onAnimationRepeat(Animation animation) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onAnimationEnd(Animation animation) {
        // TODO Auto-generated method stub

        // I can hide layout after animation completion 

    }
});

Mockup

Problem

How to do base on 300dp height?

Please help me for this problem.

Thank you.

Answer 1

View Animation

Surprisingly enough, there does not seem to be a way to specify a 300dp translate animation in XML. The translate animation XML syntax accepts three different distance specifications:

• Absolute pixels relative to normal position (e.g. android:toYDelta="10")
• Percentage relative to element width/height (e.g. android:toYDelta="10%")
• Percentage relative to parent width/height (e.g. android:toYDelta="10%p")

You are also restrained to the same specifications when you create a TranslateAnimation via Java. However, in Java you can calculate the equivalent absolute pixel value (for a given device) and supply that as your pixel translate distance.

To get 300dp, you can either define a dimen value of 300dp in XML, or simply perform the calculation in code.

Inside dimens.xml:

<dimen name="distance">300dp</dimen>

Inside your Activity/Fragment/etc:

float distance = getResources().getDimensionPixelSize(R.dimen.distance);

OR

Inside your Activity/Fragment/etc:

float distance = TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_DIP, 300,
        getResources().getDisplayMetrics()
);

Then all you need to do is use that distance when creating your TranslateAnimation:

TranslateAnimation animation = new TranslateAnimation(
        Animation.ABSOLUTE, 0,
        Animation.ABSOLUTE, 0,
        Animation.ABSOLUTE, 0,
        Animation.ABSOLUTE, distance
);

Property Animation

If you are targeting Android 3.0 and above, you can use the new Property Animation framework to express the same animation more elegantly:

view.animate().translationY(distance).setDuration(...).start();

If you are still targeting Android 2.x, you can use NineOldAndroids to get backwards compatible animation syntax. It will automatically use the new property animations for devices that support it.

ViewPropertyAnimator.animate(view).translationY(distance).setDuration(...).start();