您可以简单地使用AlphaAnimation，并在**onCreate（）**方法中将其应用到Activity的布局中，如下所示：

super.onCreate(savedInstace);
this.setContentView(R.layout.main);
RelativeLayout layout = findViewById(R.id.idLayout);
AlphaAnimation animation = new AlphaAnimation(0.0f , 1.0f ) ;
animation.setFillAfter(true);
animation.setDuration(1200);
//apply the animation ( fade In  or whatever you want) to your LAyout
layout.startAnimation(animation);

你可以试试这个

top_down.xml在anim文件夹中

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
 <translate android:fromYDelta="-100%p" android:toYDelta="0" android:duration="5000"/>
 <alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="5000" />
</set>

和/或

down_top.xml在anim文件夹中

<?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android">
     <translate android:fromYDelta="0" android:toYDelta="100%p" android:duration="5000" />
     <alpha android:fromAlpha="1.0" android:toAlpha="0.0" android:duration="5000" />
 </set>

并应用于此。

Intent intent = new Intent(this, SomeActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.top_down, R.anim.down_top);