<RelativeLayout android:id="@+id/mainContent" android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="horizontal" android:background="#ffffff">
    <ImageView
        android:id="@+id/img_effect+camera"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:src="@drawable/a" />
    <ImageView
        android:id="@+id/img_collage"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/img_effect+camera"
        android:src="@drawable/b" />
    <ImageView
        android:id="@+id/img_draw"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/img_effect+camera"
        android:layout_toRightOf="@+id/img_collage"
        android:src="@drawable/c" />
    <ImageView
        android:id="@+id/img_photo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/img_collage"
        android:layout_below="@+id/img_draw"
        android:src="@drawable/d" />
    <ImageView
        android:id="@+id/img_shop"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/img_photo"
        android:src="@drawable/e" />
</RelativeLayout>

<LinearLayout android:id="@+id/mainContent" android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical" android:background="#ffffff">
<!-- height 25% -->
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/img_effect"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:src="@drawable/a" />
    <ImageView
        android:id="@+id/img_camera"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:src="@drawable/a" />
</LinearLayout>

<!-- height 50% -->
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="2"
    android:orientation="horizontal">

    <!-- width 50% -->

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">

        <!-- height 50%% -->
        <ImageView
            android:id="@+id/img_collage"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:src="@drawable/a" />

        <!-- height 50%% -->
        <ImageView
            android:id="@+id/img_draw"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:src="@drawable/a" />
    </LinearLayout>

    <!-- width 50% -->
    <ImageView
        android:id="@+id/img_photo"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="match_parent"
        android:src="@drawable/b" />
</LinearLayout>
<!-- height 25%% -->
<ImageView
    android:id="@+id/img_shop"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:src="@drawable/e" />

final View parentView= findViewById(R.id.mainContent);
final ImageView effect_camera= (ImageView)findViewById(R.id.img_effect+camera);

effect_camera.post(new Runnable(){
   int height=parentView.getHeight();
   int width=parentView.getWidth();


   RelativeLayout.LayoutParams lp= (RelativeLayout.LayoutParams)effect_camera.getLayoutParams();
   int percentHeight=height*.25;
   int percentWidth= width*1;
   lp.height=percentHeight;
   lp.width=percentWidth;
   effect_camera.setLayoutParams(lp);
});