继承Activity
one:    在onCreate方法中添加requestWindowFeature(Window.FEATURE_NO_TITLE);//隐藏标题栏
    getWindow().setFlags(WindowManger.LayoutParams.FLAGS_FULLSCREEN,WindowManger.
    LayoutParams.FLAGS_FULLSCREEN);//全屏
two:    在Manifest中添加android:theme="@android:style/Theme.NoTitleBar"//隐藏标题栏