Circular reveal splashscreen

gistfile1.txt

**MainActivity**

package it.rugaard.circularreveal;

public class MainActivity extends AppCompatActivity {

    private boolean isRevealed;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        View rootLayout = LayoutInflater.from(this).inflate(R.layout.activity_main, null);
        setContentView(rootLayout);

        rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                final View myView = findViewById(R.id.view);
                // get the center for the clipping circle
                int cx = myView.getMeasuredWidth() / 2;
                int cy = myView.getMeasuredHeight() / 2;

                // get the final radius for the clipping circle
                int finalRadius = Math.max(myView.getWidth(), myView.getHeight()) / 2;

                // create the animator for this view (the start radius is zero)
                Animator anim = ViewAnimationUtils.createCircularReveal(myView, cx, cy, 0, finalRadius);
                anim.setDuration(500);

                // make the view visible and start the animation
                myView.setVisibility(View.VISIBLE);
                anim.start();
                isRevealed = true;
            }
        });

        ((RelativeLayout.LayoutParams) findViewById(R.id.revealButton).getLayoutParams()).topMargin = getResources().getDimensionPixelSize(R.dimen.statusbar_height);
        findViewById(R.id.revealButton).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final View myView = findViewById(R.id.view);

                if (!isRevealed) {
                    // get the center for the clipping circle
                    int cx = myView.getMeasuredWidth() / 2;
                    int cy = myView.getMeasuredHeight() / 2;

                    // get the final radius for the clipping circle
                    int finalRadius = Math.max(myView.getWidth(), myView.getHeight()) / 2;

                    // create the animator for this view (the start radius is zero)
                    Animator anim = ViewAnimationUtils.createCircularReveal(myView, cx, cy, 0, finalRadius);
                    anim.setDuration(500);

                    // make the view visible and start the animation
                    myView.setVisibility(View.VISIBLE);
                    anim.start();
                    isRevealed = true;
                } else {
                    myView.setVisibility(View.INVISIBLE);
                    isRevealed = false;
                }
            }
        });
    }
}

**styles.xml**

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="android:windowTranslucentStatus">true</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

**activity_main.xml**

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="it.rugaard.circularreveal.MainActivity">

    <TextView
        android:id="@+id/view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        android:background="@android:color/holo_red_dark"
        android:gravity="center"
        android:text="Hello World!"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        android:visibility="invisible" />

    <Button
        android:id="@+id/revealButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Reveal!" />
</RelativeLayout>

**dimens.xml**

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="statusbar_height">24dp</dimen>
</resources>