activity方法overridePendingTransition

activity实现淡入淡出效果
必须在 StartActivity()  或 finish() 之后立即调用。
overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<translate android:fromXDelta="-100%" android:toXDelta="0"
		android:duration="300" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<translate android:fromXDelta="0" android:toXDelta="100%"
		android:duration="300" />
</set>