ScrollView inside ScrollView (Inner scrollview not scrollable)

UI :
---

<ScrollView android:id="@+id/parent_scroll" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:layout_weight="1" 
android:focusableInTouchMode="false"> 

<LinearLayout 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:orientation="vertical" > 

<ScrollView 
android:id="@+id/child_scroll" 
android:layout_width="fill_parent" 
android:layout_height="100dp" > 

<TextView 
android:id="@+id/text_description" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:padding="5dip" 
android:scrollbars="vertical" 
android:text="Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum." 
android:textAppearance="?android:attr/textAppearanceLarge" /> 

</ScrollView> 

<ImageView 
android:id="@+id/imageView1" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_margin="10dp" 
android:scaleType="fitXY" 
android:src="@drawable/a" /> 

<ScrollView 
android:id="@+id/scrollView1" 

android:layout_width="match_parent" 

android:layout_height="wrap_content" > 

<LinearLayout 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" > 

<TextView 
android:id="@+id/textView1" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?" 
android:textAppearance="?android:attr/textAppearanceLarge" /> 

</LinearLayout> 
</ScrollView> 

</LinearLayout> 
</ScrollView> 

Java :

MainActivity.java 
public class MainActivity extends Activity { 

private ScrollView parentScroll, childScroll; 
private String TAG = "SNS"; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
parentScroll=(ScrollView)findViewById(R.id.parent_scroll); 
childScroll=(ScrollView)findViewById(R.id.child_scroll); 

parentScroll.setOnTouchListener(new View.OnTouchListener() { 

public boolean onTouch(View v, MotionEvent event) { 
Log.v(TAG,"PARENT TOUCH"); 
findViewById(R.id.child_scroll).getParent().requestDisallowInterceptTouchEvent(false); 
return false; 
} 
}); 
childScroll.setOnTouchListener(new View.OnTouchListener() { 

public boolean onTouch(View v, MotionEvent event) 
{ 
Log.v(TAG,"CHILD TOUCH"); 
// Disallow the touch request for parent scroll on touch of child view 
v.getParent().requestDisallowInterceptTouchEvent(true); 
return false; 
} 
}); 
} 
}