CODEWITHSUNDEEP
androidandroid-layoutandroid-scroll
nKn
nKn

Reputation: 13761

Show scrollbars only when user manually scrolls

I'm working on the following TextView:

<?xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/tabsContent"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="3dp"
        android:background="@drawable/rounded_edges"
        android:gravity="bottom"
        android:padding="8dp"
        android:scrollHorizontally="false"
        android:scrollbarStyle="insideOverlay"
        android:scrollbars="vertical"
        android:textColor="#FFFFFF"
        android:textSize="11sp"
        android:typeface="monospace" />

This TextView is used to display large amount of data that I get from a Socket, so the content is updated by a background Service. The problem is that after certain amount of text, the scrollbar is enabled and each time I append a line to the TextView, the scrollbar starts to show and fade out every time a new line is appended to the TextView, as its gravity is set to bottom, so it gets annoying for the user.

What I want to achieve is to enable the visibility of the scrollbar only if the user scrolls manually up or down, but haven't found anything so far to implement this. What I've tried is:

At this point I'm out of ideas on how to implement this, so any advice is appreciated. Thanks.

Upvotes: 0

Views: 511

Answers (1)

corsair992
corsair992

Reputation: 3070

You can disable the vertical scroll bar before appending new text to the TextView, and post an event to reenable it after the text has been drawn.

Something like this:

textView.setVerticalScrollBarEnabled(false);
textView.append("New Text");
textView.post(new Runnable() {
    @Override
    public void run() {
        textView.setVerticalScrollBarEnabled(true);
    }
});

Of course you should reuse a single Runnable object for enabling the scroll bar, instead of creating a new one on every change to the text.

Note that if you set the TextView gravity to bottom, then it will be constantly scrolled to the bottom whenever the text is changed, regardless of any scrolling done by the user in the interim.

Upvotes: 1

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