Question

Iam using below code in xml file and adding child views programmatically by using textview but i need to go specific position(suppose in every textview iam adding number start from 1 then i want to go 5th position textview from total of 10 textviews) on the view using scrollview.I knew the method to scroll but i dont know how to calculate the x y cooardinates from this layout.Please give guidance.

<ScrollView android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:scrollbars="vertical"
        android:id="@+id/agenda_scroll"
        >
        <LinearLayout android:id="@+id/inner_layout"
            android:orientation="vertical" android:layout_width="fill_parent"
            android:layout_height="fill_parent">

        </LinearLayout>
    </ScrollView>

Suppost my code is like this

ScrollView scview = (ScrollView)findViewById(R.id.Scl);
LinearLayout eventLayout = (LinearLayout) findViewById(R.id.inner_layout);
TextView txtView = new TextView(cx);
txtView.setText("1");
eventLayout.addView(txtview);
TextView txtView = new TextView(cx);
txtView.setText("2");
eventLayout.addView(txtview);
TextView txtView = new TextView(cx);
txtView.setText("3");
eventLayout.addView(txtview);
TextView txtView = new TextView(cx);
txtView.setText("4");
eventLayout.addView(txtview);
TextView txtView = new TextView(cx);
txtView.setText("5");

int y = txtview.getTop();
Log.d(TAG,"YAxis"+y);//returning 0


eventLayout.addView(txtview);
TextView txtView = new TextView(cx);
txtView.setText("6");
eventLayout.addView(txtview);
.........

scview .scrollTo(0,y);///here positions giving (0,0)

Answer 1

I know this is kind of old, but here’s something that we’ve seen working. Every view has a ViewTreeObserver that can be used to observe the View and it’s hierarchy. Get the ViewTreeObserver and listen for layout changes as follows. Once the view and it’s hierarchy has been laid out, you can perform your size and position based queries.

onCreate(){
  //Code

  eventLayout.addView(txtview);
  TextView txtView = new TextView(cx);
  txtView.setText("6");
  eventLayout.addView(txtview)

  //More code

  //Observe for a layout change
  ViewTreeObserver viewTreeObserver = eventLayout.getViewTreeObserver();
  if (viewTreeObserver.isAlive()) {
    viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
        //View and it's hierarchy laid out, perform your operations
        scview .scrollTo(0,y);///here positions giving (0,0)
      }
    });
  }
}