以前遇到“RelativeLayout子控件似乎不能垂直居中”，在某个偶然机会中看到的RelativeLayout属性： layout_centerInParent、layout _ center horizont p Android : layout _ width=' match _ parent ' Android 3360 layout _ height=' match _ parent ' Android 3360定向分析60 layout _ height=' wrap _ content ' Android 3360 background=p Android 3360 layout _ width=' wrap _ content ' Android 3365365292; eight=' wrap _ content ' Android 360 layout _ c eight p Android 3360 layout _ width=' fill _ parent ' Android 3360 layout _ hh layout _ bg1 ' Android : padding=' 20dp '/p Android : layout _ width=' wrap _ content ' Android 3360 layout _ height=' wrap _ content ' Android 3360 layout _ c eight : layout _ width=' fill _ parent ' Android 3360 layout _ height=' wrap _ content ' Android 3360 background=p Android : height=' wrap _ content ' Android 3360 layout _ c eight=' wrap _ content ' Android 360 layout _ c eight p Android 3360 layout _ AP _ content ' Android 3360 background=linear layout _ bg1 ' Android : padding=' 20dp '/p Android : layout _ width=' wrap _ content ' Android 3360 layout _ height=' wrap _ content ' Android 3360 layout _ c eight : layout _ width=' fill _ parent ' Android 3360 layout _ height=' wrap _ content ' Android 3360 background=linear layout p Android : layout _ width=' wrap _ content ' Android 3360 layout _ height=' wrap _ content ' Android 3360 layout _ alight : layout _ width=' fill _ parent ' Android 3360 layout _ height=' wrap _ content ' Android 3360 background=linear layout p Android : layout _ width=' wrap _ content ' Android 3360 layout _ height=' wrap _ content ' Android 3360 layout _ alight : layout _ width=' fill _ parent ' Android : layout _ height=' 80dp ' Android 3360 background=' @ drawabllend p andround ayout _ height=' wrap _ content ' Android 3360 layout _ alight=' wrap _ content ' Android 360 layout _ alight