I updated your code. Replace your code with below one. Which perfectly moves HorizontalScrollView to right of the screen.
Replace Your MainActivity.java with below one:
public class AndroidHTMLActivity extends Activity{
TextView tv;
HorizontalScrollView hsv;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.textView1);
}
public void btnOnClick(View v){
tv.append("a");
System.out.println("tv.getWidth()="+tv.getWidth());
hsv = (HorizontalScrollView)findViewById(R.id.horizontalScrollView1);
ViewTreeObserver vto = hsv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){
@Override
public void onGlobalLayout() {
hsv.getViewTreeObserver().removeGlobalOnLayoutListener(this);
hsv.scrollTo(tv.getWidth(), 0);
}
});
}
}
And replace youe Xml file with below one:
<?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"
android:id="@+id/ll_parent_layout">
<HorizontalScrollView
android:id="@+id/horizontalScrollView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30dp"
android:text="push the button" />
</LinearLayout>
</HorizontalScrollView>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="btnOnClick"
android:text="Button" />
</LinearLayout>
This code fulfile your condition which you wants.