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PORelativeLayout and canvas costum view
 

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    <p>I would like to make an activity with this structure:</p> <p><img src="https://i.stack.imgur.com/2uCu7.png" alt="Desired layout"> The idea is to put some text in the top, a banner allways in the top, the button OVER the banner and my canvas in the center of the view, using all the possible space.</p> <p>I'm subclassing View to draw my canvas and overloading the onMeasure() method:</p> <pre><code>@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // Calculate the size of the board this.squareSize = MeasureSpec.getSize(widthMeasureSpec) / BOARD_NUM_ROWS; this.leftMargin = (MeasureSpec.getSize(widthMeasureSpec) - squareSize*BOARD_NUM_COLUMNS) / 2; this.topMargin = this.leftMargin; // Set the size of the board to full width and aspect ratio height int desiredWidth = MeasureSpec.getSize(widthMeasureSpec); int desiredHeight = this.topMargin + (BOARD_NUM_ROWS * this.squareSize) + this.topMargin; this.setMeasuredDimension(desiredWidth, desiredHeight); } </code></pre> <p>And this is my XML:</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context=".DrawLevelActivity" android:background="@color/activity_background"&gt; &lt;TextView android:id="@+id/instructionsText" android:gravity="center" android:paddingTop="10dp" android:paddingBottom="10dp" android:paddingLeft="0dp" android:paddingRight="0dp" android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt; &lt;com.mycanvas.BoardCanvas android:id="@+id/boardCanvas" android:gravity="center" android:layout_below="@+id/instructionsText" android:layout_centerVertical="true" android:padding="0dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;Button android:id="@+id/solveButton" android:gravity="center" android:paddingTop="10dp" android:paddingBottom="10dp" android:paddingLeft="30dp" android:paddingRight="30dp" android:layout_below="@+id/boardCanvas" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;com.google.ads.AdView xmlns:googleads="http://schemas.android.com/apk/lib/com.google.ads" android:id="@+id/adView" android:gravity="center" android:paddingTop="0dp" android:paddingBottom="0dp" android:paddingLeft="0dp" android:paddingRight="0dp" android:layout_alignParentBottom="true" android:layout_width="fill_parent" android:layout_height="wrap_content" googleads:adSize="BANNER" googleads:adUnitId="@string/admob_id" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Unfortunately the button appear under the banner and I think that the reason is that the canvas is very large.</p> <p>The set value in onMeasure() is always smaller than MeasureSpec.getSize(heightMeasureSpec)</p>
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