OK, I've tried your layout, and first of all, you don't need the xmlns in the linearlayout
about the rest:
1) I'm guessing sqwhite is the big white tile. if it is, I don't see any src or background, but the use of src if you're using it might stretch the view.
2) The layout just as I copied it, does move all items to the right, don't really know what's happening there.
3)I see this also working properly.
Other comments:
-The framelayout is unnecessary
-You can use a simple linearlayout for the image_source_frame
Here's what I did. Though I changed a few references to your project so I could use the graphical layout, so change them back. This layout as it is seems to solve all your 3 problems here.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="1.0" >
<GridView
android:id="@+id/image_grid_view"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="0.8"
android:background="#FFFF0000"
android:gravity="center"
android:horizontalSpacing="2dip"
android:numColumns="3"
android:stretchMode="columnWidth"
android:verticalSpacing="2dip" />
<RelativeLayout
android:id="@+id/bottom_part"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_weight="0.2"
android:background="@android:color/black"
android:orientation="horizontal"
android:weightSum="1.0" >
<Button
android:id="@+id/button_add_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:onClick="onClickAddImage"
android:text="Add image" />
<com.example.project.DeleteZone
android:id="@+id/delete_zone_view"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
android:src="#FF00FF00" />
<LinearLayout
android:id="@+id/image_source_frame"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:orientation="vertical"
android:gravity="right" >
<ImageView
android:id="@+id/sqwhite"
android:layout_width="5dp"
android:layout_height="5dp"
android:layout_gravity="right"
android:layout_marginRight="5dp" />
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="5dp" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:text=""
android:textColor="@android:color/white" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
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