<activity
android:name="xxxxx"
android:alwaysRetainTaskState="true"
android:configChanges="locale|keyboardHidden|orientation"
android:launchMode="singleTop"
android:screenOrientation="portrait"

android:theme="@android:style/Theme.NoTitleBar"

android:windowSoftInputMode="stateHidden|adjustPan" />

*alwaysRetainTaskState：标记Activity所在的Task的状态是否总是由系统来保持

*configChanges：横竖屏切换，生命周期的调用与否

*launchMode：activity的启动模式

*screenOrientation：设置应用的横竖屏

*windowSoftInputMode：软键盘的设置