activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#a4ba93">
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Animate Size"
android:layout_margin="25dp"
android:padding="25dp"
android:layout_gravity="top|center_horizontal"
android:gravity="center"
/>
<View
android:id="@+id/view_box"
android:layout_width="100dp"
android:layout_height="100dp"
android:background="#ff0000"
android:layout_gravity="center"
android:layout_margin="15dp"
/>
</android.support.design.widget.CoordinatorLayout>
MainActivity.java
package com.cfsuman.me.androidcodesnippets;
import android.app.Activity;
import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.transition.ChangeBounds;
import android.transition.TransitionManager;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnticipateOvershootInterpolator;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private Context mContext;
private Activity mActivity;
private static final String TAG = MainActivity.class.getSimpleName();
private CoordinatorLayout mCLayout;
private Button mButton;
private View mViewBox;
private boolean isBig = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the application context
mContext = getApplicationContext();
mActivity = MainActivity.this;
// Get the widget reference from XML layout
mCLayout = (CoordinatorLayout) findViewById(R.id.coordinator_layout);
mButton = (Button) findViewById(R.id.btn);
mViewBox = (View) findViewById(R.id.view_box);
mViewBox.getLayoutParams().width = 400;
mViewBox.getLayoutParams().height = 200;
// Set a click listener for button
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
/*
ChangeBounds
This transition captures the layout bounds of target views before and after
the scene change and animates those changes during the transition.
*/
// Initialize a new ChangeBounds transition instance
ChangeBounds changeBounds = new ChangeBounds();
// Set the transition start delay
changeBounds.setStartDelay(300);
// Set the transition interpolator
changeBounds.setInterpolator(new AnticipateOvershootInterpolator());
// Specify the transition duration
changeBounds.setDuration(1000);
// Begin the delayed transition
TransitionManager.beginDelayedTransition(mCLayout,changeBounds);
// Toggle the button size
toggleSize(mViewBox);
}
});
}
// Custom method to toggle view size
protected void toggleSize(View v){
ViewGroup.LayoutParams params = v.getLayoutParams();
if(isBig){
params.width = 400;
params.height = 200;
isBig = false;
}else {
params.width = ViewGroup.LayoutParams.MATCH_PARENT;
params.height = ViewGroup.LayoutParams.MATCH_PARENT;
isBig = true;
}
v.setLayoutParams(params);
}
}

