LayoutTransition: Animate View next to an expanding View

I've recreated my problem to a very simple representation. I have 3 TextViews. 2 of them are in a seperate LinearLayout, the third is on the same level as the LinearLayout. I'm toggling the visibility of test1 and test2, and I'd like to see them fade away (which works). Furthermore, I want test3 to slide into his new place (taking place of test1 and test2). I can't make this happen. test3 just snaps to it's new point.

How can I achive this?

My code:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parent"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:animateLayoutChanges="true"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click" />

    <LinearLayout android:animateLayoutChanges="true"
        android:id="@+id/child1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/test1"
            android:layout_width="match_parent" android:visibility="gone"
            android:layout_height="wrap_content"
            android:text="TEST1" />

        <TextView
            android:id="@+id/test2"
            android:layout_width="match_parent" android:visibility="gone"
            android:layout_height="wrap_content"
            android:text="TEST2" />
    </LinearLayout>

    <TextView
        android:id="@+id/test3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TEST3" />

</LinearLayout>

And in my Activity

android android-animation

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1 Answer

I've solved it using an other question. See this answer

Quoting:

I believe the simplest approach is to extend Animation class and override applyTransformation() to change the view's height as follows:

import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.LinearLayout;

public class MyCustomAnimation extends Animation {

    public final static int COLLAPSE = 1;
    public final static int EXPAND = 0;

    private View mView;
    private int mEndHeight;
    private int mType;
    private LinearLayout.LayoutParams mLayoutParams;

    public MyCustomAnimation(View view, int duration, int type) {

        setDuration(duration);
        mView = view;
        mEndHeight = mView.getHeight();
        mLayoutParams = ((LinearLayout.LayoutParams) view.getLayoutParams());
        mType = type;
        if(mType == EXPAND) {
            mLayoutParams.height = 0;
        } else {
            mLayoutParams.height = LayoutParams.WRAP_CONTENT;
        }
        view.setVisibility(View.VISIBLE);
    }

    public int getHeight(){
        return mView.getHeight();
    }

    public void setHeight(int height){
        mEndHeight = height;
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {

        super.applyTransformation(interpolatedTime, t);
        if (interpolatedTime < 1.0f) {
            if(mType == EXPAND) {
                mLayoutParams.height =  (int)(mEndHeight * interpolatedTime);
            } else {
                mLayoutParams.height = (int) (mEndHeight * (1 - interpolatedTime));
            }
            mView.requestLayout();
        } else {
            if(mType == EXPAND) {
                mLayoutParams.height = LayoutParams.WRAP_CONTENT;
                mView.requestLayo


                        
                        
                            answered 2013-01-06T21:03:15.093

LayoutTransition: Animate View next to an expanding View

1 Answer

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