我想要的是，当设备改变方向时，纵向时屏幕上的顶线仍然是横向屏幕上的顶线。反之亦然。

由于竖屏和横屏的屏幕宽度可能不同，所以文本的线宽，也就是TextView的宽度。和 ScrollView , 会有所不同。因此，换行在不同的屏幕配置(纵向与横向，大与小)中会有所不同。在不同的情况下，换行符将位于不同的位置。

共有三个不太完美解决方案供您引用。也说明了它们的缺点。

首先，最基本的方法:

(1) 仅以像素为单位存储 y 偏移量

请看:http://eliasbland.wordpress.com/2011/07/28/how-to-save-the-position-of-a-scrollview-when-the-orientation-changes-in-android/

为什么这不是那么完美:

在纵向中，线条被换行。

Line_1_Word_A Line_1_Word_B Line_1_Word_C
Line_1_Word_D
Line_2_Word_A Line_2_Word_B Line_2_Word_C
Line_2_Word_D
Line_3_Word_A Line_3_Word_B Line_3_Word_C
Line_3_Word_D

Line_1_Word_A Line_1_Word_B Line_1_Word_C Line_1_Word_D
Line_2_Word_A Line_2_Word_B Line_2_Word_C Line_2_Word_D
Line_3_Word_A Line_3_Word_B Line_3_Word_C Line_3_Word_D

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    final ScrollView scrollView = (ScrollView) findViewById(R.id.Trial_C_ScrollViewContainer);
    outState.putFloatArray(ScrollViewContainerScrollPercentage,
            new float[]{
            (float) scrollView.getScrollX()/scrollView.getChildAt(0).getWidth(),
            (float) scrollView.getScrollY()/scrollView.getChildAt(0).getHeight() });
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    final float[] scrollPercentage = savedInstanceState.getFloatArray(ScrollViewContainerScrollPercentage);
    final ScrollView scrollView = (ScrollView) findViewById(R.id.Trial_C_ScrollViewContainer);
    scrollView.post(new Runnable() {
        public void run() {
            scrollView.scrollTo(
                    Math.round(scrollPercentage[0]*scrollView.getChildAt(0).getWidth()),
                    Math.round(scrollPercentage[1]*scrollView.getChildAt(0).getHeight()));
        }
    });
}

Line_1_Word_A Line_1_Word_B
Line_1_Word_C Line_1_Word_D
Line_1_Word_E Line_1_Word_F
Line_2_Word_A
Line_3_Word_A
Line_4_Word_A

Line_1_Word_A Line_1_Word_B Line_1_Word_C Line_1_Word_D Line_1_Word_E Line_1_Word_F
Line_2_Word_A
Line_3_Word_A
Line_4_Word_A

Line_1_Word_A Line_1_Word_B
Line_1_Word_C Line_1_Word_D
Line_1_Word_E Line_1_Word_F
Line_2_Word_A
Line_3_Word_A
Line_4_Word_A

Line_1_Word_A Line_1_Word_B Line_1_Word_C Line_1_Word_D Line_1_Word_E Line_1_Word_F
Line_2_Word_A
Line_3_Word_A
Line_4_Word_A

最佳答案

我很自豪地说，我现在有了一个完美的解决方案。

嘘....(对不起，我太兴奋了。如果您发现任何错误/错误/弱点，请给我您的宝贵建议，请随时纠正我。:-)

废话少说。干得好 !!!

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    final ScrollView scrollView = (ScrollView) findViewById(R.id.Trial_C_ScrollViewContainer);
    final TextView textView = (TextView) scrollView.getChildAt(0);
    final int firstVisableLineOffset = textView.getLayout().getLineForVertical(scrollView.getScrollY());
    final int firstVisableCharacterOffset = textView.getLayout().getLineStart(firstVisableLineOffset);
    outState.putInt(ScrollViewContainerTextViewFirstVisibleCharacterOffset, firstVisableCharacterOffset);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    final int firstVisableCharacterOffset = savedInstanceState.getInt(ScrollViewContainerTextViewFirstVisibleCharacterOffset);

    final ScrollView scrollView = (ScrollView) findViewById(R.id.Trial_C_ScrollViewContainer);
    scrollView.post(new Runnable() {
        public void run() {
            final TextView textView = (TextView) scrollView.getChildAt(0);
            final int firstVisableLineOffset = textView.getLayout().getLineForOffset(firstVisableCharacterOffset);
            final int pixelOffset = textView.getLayout().getLineTop(firstVisableLineOffset);
            scrollView.scrollTo(0, pixelOffset);
        }
    });
}

关于android - 最佳方式 : Save & Restore TextView Position in ScrollView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15678489/