Change the width of the layout and align to the right side while clicking the button

I have to develop an Android application in t开发者_高级运维hat when I click the button in the map view, the view should shrinks to a particular width and should align to the right side. But when I click the button, the width of the mapview is reducing but it is left aligning. I tried a lot to align it to left side, but I couldn’t do it. Any idea plz. The figures are attached.

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I don't know if MapView has a non standard behavior, but I can think of different ways:

• having the MapView inside a RelativeLayout and using android:alignParentRight="true"

• having the MapView inside a LinearLayout, with before it another view (I suspect you'll have one in the cyan part) set as wrap_content, and the MapView set with weight=1. (switching the first view between GONE and VISIBLE would do the job)

• setting a left margin on the MapView.