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Insert background picture

1. Images used by Android are in PNG format and do not have to be written when used. png
2. Android:layout_gravity is the position of this label, android:gravity refers to the component inside this label

To insert an animation effect on a picture: Alphaanimation

1. Generates a animation object that represents the animation effect
2. Animate a picture

Make activity fullscreen

Jump to activity at the end of an animation

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