You will need to set the weight of CheckBox
So your code now would be:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TableRow>
<ImageView
android:id="@+id/img"
android:layout_width="50dp"
android:layout_height="50dp"/>
<TextView
android:id="@+id/txt"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:gravity="center_vertical"
/>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:gravity="right"
android:layout_weight="0.08"
android:layout_height="fill_parent" >
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical" />
</LinearLayout>
</TableRow>
</TableLayout>
Answer given by Jagdeep Singh. Note: I removed the answer from the question so I had to put it here. But I will remove this as soon as Jagdeep writes an answer and I am notified