Android UI How to - Create Layout Changes Animation








The following code shows how to Create Layout Changes Animation.

Example

Main layout xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onAddClick"
        android:text="Click To Add Item" />

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

</LinearLayout>

Main Activity Java code

import android.animation.Animator;
import android.animation.LayoutTransition;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
//w ww  .  jav  a 2s . c  o  m
public class MainActivity extends Activity {

    LinearLayout mContainer;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mContainer = (LinearLayout) findViewById(R.id.verticalContainer);
        LayoutTransition transition = new LayoutTransition();
        mContainer.setLayoutTransition(transition);
        
        Animator appearAnim = ObjectAnimator.ofFloat(null, "rotationY", 90f, 0f)
                .setDuration(transition.getDuration(LayoutTransition.APPEARING));
        transition.setAnimator(LayoutTransition.APPEARING, appearAnim);

        Animator disappearAnim = ObjectAnimator.ofFloat(null, "rotationX", 0f, 90f)
                .setDuration(transition.getDuration(LayoutTransition.DISAPPEARING));
        transition.setAnimator(LayoutTransition.DISAPPEARING, disappearAnim);
        
        PropertyValuesHolder pvhSlide = PropertyValuesHolder.ofFloat("y", 0, 1);
        PropertyValuesHolder pvhScaleY = PropertyValuesHolder.ofFloat("scaleY", 1f, 0.4f, 1f);
        PropertyValuesHolder pvhScaleX = PropertyValuesHolder.ofFloat("scaleX", 1f, 0.6f, 1f);
        Animator changingAppearingAnim = ObjectAnimator.ofPropertyValuesHolder(this, pvhSlide, pvhScaleY, pvhScaleX)
                .setDuration(transition.getDuration(LayoutTransition.CHANGE_DISAPPEARING));
        transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING, changingAppearingAnim);
    }

    public void onAddClick(View v) {
        Button button = new Button(this);
        button.setText("Click To Remove");
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mContainer.removeView(v);
            }
        });

        mContainer.addView(button, new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
    }
}
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