FrameLayout margin not working

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本文解决了在2.3版本手机上FrameLayout中view设置margin无效的问题。通过设置ImageView的layout_gravity为top，可以成功应用margin。若不设置gravity，则FrameLayout不会计算margin。

问题：在2.3版本手机上 FrameLayout 中view 设置 margin 无效

解决：

I had the same issue myself and noticed that setting the layout_ margins does not work until you also set your ImageView's layout gravity i.e. android:layout_gravity="top" in the XML resource file, or from code: FrameLayout.LayoutParams.gravity = Gravity.TOP;.

原因：

To make it more clear why. The FrameLayout.onLayout() call contains this (in api v2.3.4 at least): // for each child: final LayoutParams lp = (LayoutParams) child.getLayoutParams(); final int gravity = lp.gravity; if (gravity != -1) { // handle all margin related stuff So if gravity is -1, there will be no margin calculation. Gravity in FrameLayout.LayoutParams is defined by: gravity = a.getInt(com.android.internal.R.styleable.FrameLayout_Layout_layout_gravity, -1); So if gravity is not set, there will be no margin calculation.

链接：

http://stackoverflow.com/questions/5401952/framelayout-margin-not-working#