activity_takepicture_demo.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="?attr/actionBarSize"
    android:paddingBottom="@dimen/activity_vertical_margin"
    >
 
        <Button
            android:id="@+id/btnTakePicture"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="takePicture_Click"
            android:text="Take Picture" />
 
        <ImageView
            android:id="@+id/img_camera"
            android:layout_width="200dip"
            android:layout_height="200dip"
            android:layout_below="@+id/btnTakePicture"
            android:layout_centerHorizontal="true"
            android:layout_margin="5dp"
            tools:src="@mipmap/abc1" />
 
</RelativeLayout>