滚动TextView到文本位置

Question

I want to scroll my TextView to make visible a specific position in the text. How can I do that? I tried bringPointIntoView (int offset) but without success.

Source code:

public class TextScrollActivity extends Activity {
  public void onCreate (final Bundle savedInstanceState) {
    super.onCreate (savedInstanceState);
    final int position = 500;
    final TextView textView = new TextView (this);
    final ScrollView scrollView = new ScrollView (this);
    scrollView.addView (textView);
    Button button = new Button (this);
    button.setText ("Scroll to " + position);
    LinearLayout layout = new LinearLayout (this);
    layout.setOrientation (LinearLayout.VERTICAL);
    layout.addView (scrollView,
    new LayoutParams (LayoutParams.FILL_PARENT, 200));
    layout.addView (button, new LayoutParams (LayoutParams.FILL_PARENT,
    LayoutParams.WRAP_CONTENT));
    StringBuilder builder = new StringBuilder ();
    for (int i = 0; i < 1000; i++)
      builder.append (String.format ("[ %05d ] ", i));
    textView.setText (builder);
    setContentView (layout);
    button.setOnClickListener (new OnClickListener () {
      public void onClick (View v) {
        System.out.println (textView.bringPointIntoView (position * 10));
        // scrollView.scrollTo (0, position * 10); // no
      }
    });
  }
}

Answer 1

For those who have the same problem, I finally made my own implementation of bringPointIntoView:

  public static void bringPointIntoView (TextView textView,
  ScrollView scrollView, int offset)
  {
    int line = textView.getLayout ().getLineForOffset (offset);
    int y = (int) ((line + 0.5) * textView.getLineHeight ());
    scrollView.smoothScrollTo (0, y - scrollView.getHeight () / 2);
  }

Don't hesitate if you have a better solution.

Answer 2

在文本视图中添加移动方法是否可以解决问题？

textView.setMovementMethod(new ScrollingMovementMethod());

Answer 3

仅供参考，对于有相同问题的其他任何人，在具有大listItems的listView上，可以将重载的bringPointIntoView传递给ListView而不是ScrollView并使用ScrollTo方法而不是smoothScrollTo 。