CODEWITHSUNDEEP
androidtextviewscrollview
user1417127
user1417127

Reputation: 1645

Android ScrollView scrollTo() method not working with TextView?

For Example, I have a layout like this:

<ScrollView>
  <LinearLayout>
    <LinearLayout>
         ...
    </LinearLayout>
    <LinearLayout>
         ...
    </LinearLayout>
    <LinearLayout>
         <TextView>
         </TextView>
    </LinearLayout>
  </LinearLayout>
</ScrollView>

My TextView have long content. Now I can scroll the ScrollView manually to the end of TextView content. In the code, I write: scrview.scrollTo(0, 800);, with scrview is my ScrollView. It supposed to scroll to the middle of the TextView content. But when running, it only scrolled to the start of the TextView and can't scroll through the TextView content.

Does anybody know what causing this problems?

EDIT: I found it. Seems like I call scrollTo too soon. Using 

scrview.post(new Runnable() {
                public void run() {
                    scrview.scrollTo(0, 800);
                }
            });

instead and it works. Posted the answer for anyone getting same problem.

Upvotes: 9

Views: 9928

Answers (3)

mgonzalez
mgonzalez

Reputation: 107

You have to call to scrollTo inside a runnable because the scrollview has not beed layouted yet, so when using a runnable you can experiment screen blinking. To solve this issue, you can listen for lauyout changes on scrollview like this:

scrollview.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
                scrollview.scrollTo(x, y)
            }
        });

Upvotes: 0

user1417127
user1417127

Reputation: 1645

I found it. Seems like I call scrollTo too soon. Using

scrview.post(new Runnable() {
                public void run() {
                    scrview.scrollTo(0, 800);
                }
            });

instead and it works. Posted the answer for anyone getting same problem.

Upvotes: 22

gian1200
gian1200

Reputation: 3854

First of all, if all your LinearLayouts have the same orientation, why you don't simply create it only once? If I'm not wrong, ScrollView can only have 1 child (1 direct child). Maybe that's probably the reason of your problems. However, if you still want those 3 LinearLayouts, you can create a FrameLayout as a parent to hold them and make that FrameLayout the child of the ScrollView

Upvotes: 2

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