Fade in Activity from previous Activity in Android

Question

I am currently working on an Android app and I am having some issues with my splash activity. I want my main activity to fade in from my splash activity, not from a black sc

Answer 1

It is about the order of things. Here is an example which fades into next activity after 3 seconds:

new Handler().postDelayed(new Runnable() {
  @Override
  public void run() {

    //Create an intent that will start the main activity.
    Intent mainIntent = new Intent(SplashActivity.this, MainMenuActivity.class);
    SplashActivity.this.startActivity(mainIntent);

    //Finish splash activity so user cant go back to it.
    SplashActivity.this.finish();

    //Apply splash exit (fade out) and main entry (fade in) animation transitions.
    overridePendingTransition(R.anim.mainfadein, R.anim.splashfadeout);
  }
}, 3000);

Note that here there a two animations fade in and fade out.

mainfadein.xml

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android" 
        android:interpolator="@android:anim/accelerate_interpolator" 
        android:fromAlpha="0.0" 
        android:toAlpha="1.0" 
        android:duration="700" />

splashfadeout.xml

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android" 
        android:interpolator="@android:anim/decelerate_interpolator"
        android:zAdjustment="top" 
        android:fromAlpha="1.0" 
        android:toAlpha="0.0" 
        android:duration="700" />

Answer 2

I'd recommend against a classic crossfade, but rather show the new Activity without an animation and just fade out the current Activity. This looks & feels much cleaner and resolves some minor issues where you can see the launcher/underlying app when you open the app from the background while the animation is starting.

my_splash_fade_out.xml

<?xml version="1.0" encoding="utf-8"?>

<alpha
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="750"
    android:fromAlpha="1.0"
    android:interpolator="@android:interpolator/accelerate_cubic"
    android:startOffset="250"
    android:toAlpha="0.0"
    android:zAdjustment="top" />

I'm adding a startOffset here to give the newly created Activity a bit off a head start, as it is rather heavy.

MySplashActivity.java

...
startActivity( ... );
finish();
overridePendingTransition( 0, R.anim.screen_splash_fade_out );

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