滚动的TextView文本位置 [英] Scroll TextView to text position

问题描述

我要滚动我的TextView，使文本可见的特定位置。我该怎么办呢？我想bringPointIntoView（INT偏移），但没有成功。

来源$ C ​​$ C：

 公共类TextScrollActivity延伸活动{
  公共无效的onCreate（最终捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    最终诠释位置= 500;
    最后的TextView TextView的=新的TextView（本）;
    最后的滚动型滚动视图=新的滚动型（本）;
    scrollView.addView（TextView的）;
    Button按钮=新的按钮（这一点）;
    button.setText（滚动到+位置）;
    的LinearLayout布局=新的LinearLayout（本）;
    layout.setOrientation（LinearLayout.VERTICAL）;
    layout.addView（滚动视图，
    新的LayoutParams（LayoutParams.FILL_PARENT，200））;
    layout.addView（按钮，新的LayoutParams（LayoutParams.FILL_PARENT，
    LayoutParams.WRAP_CONTENT））;
    StringBuilder的建设者=新的StringBuilder（）;
    的for（int i = 0; I＆LT; 1000;我++）
      builder.append（的String.Format（[％05D]，I））;
    textView.setText（制造商）;
    的setContentView（布局）;
    button.setOnClickListener（新OnClickListener（）{
      公共无效的onClick（视图v）{
        的System.out.println（textView.bringPointIntoView（位置* 10））;
        // scrollView.scrollTo（0，位置* 10）; // 没有
      }
    }）;
  }
}
 

解决方案

对于那些谁有同样的问题，我终于做出了我自己的实现bringPointIntoView的：

 公共静态无效bringPointIntoView（TextView的TextView的，
  滚动型滚动视图，诠释抵消）
  {
    INT线= textView.getLayout（）.getLineForOffset（补偿）;
    INT Y =（int）的（（线+ 0.5）* textView.getLineHeight（））;
    scrollView.smoothScrollTo（0，Y  -  scrollView.getHeight（）/ 2）;
  }
 

如果你有一个更好的解决办法，不要犹豫。

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
      }
    });
  }
}

解决方案

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.

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