EditText in ScrollView

1. 滚动冲突解决

public class XEditText extends EditText {
  
    //滑动距离的最大边界
    private int mOffsetHeight;

    //是否到顶或者到底的标志
    private boolean mBottomFlag = false;

    public XEditText(Context context) {
        super(context);
    }

    public XEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public XEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int paddingTop;
        int paddingBottom;
        int height;
        int layoutHeight;

        //获得内容面板
        Layout layout = getLayout();
        //获得内容面板的高度
        layoutHeight = layout.getHeight();
        //获取上内边距
        paddingTop = getTotalPaddingTop();
        //获取下内边距
        paddingBottom = getTotalPaddingBottom();

        //获得控件的实际高度
        height = getHeight();

        //计算滑动距离的边界
        mOffsetHeight = layoutHeight + paddingTop + paddingBottom - height;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN)
            //如果是新的按下事件，则对mBottomFlag重新初始化
            mBottomFlag = false;
        //如果已经不要这次事件，则传出取消的信号，这里的作用不大
        if (mBottomFlag)
            event.setAction(MotionEvent.ACTION_CANCEL);
        return super.dispatchTouchEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean result = super.onTouchEvent(event);
        //如果是需要拦截，则再拦截，这个方法会在onScrollChanged方法之后再调用一次
        if (!mBottomFlag)
            getParent().requestDisallowInterceptTouchEvent(true);
        return result;
    }

    @Override
    protected void onScrollChanged(int horiz, int vert, int oldHoriz, int oldVert) {
        super.onScrollChanged(horiz, vert, oldHoriz, oldVert);
        if (vert == mOffsetHeight || vert == 0) {
            //这里触发父布局或祖父布局的滑动事件
            getParent().requestDisallowInterceptTouchEvent(false);
            mBottomFlag = true;
        }
    }
} 

2. 解决EditText换行后，ScrollView跟随滚动的问题
   重写ScrollView的computeScrollDeltaToGetChildRectOnScreen方法

  @Override
  protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) {
        View currentFocused = findFocus();
        if (null == currentFocused || this == currentFocused) {
            return super.computeScrollDeltaToGetChildRectOnScreen(rect);
        }

        // 重新计算需要显示的区域
        Rect tempRect = new Rect();
        currentFocused.getDrawingRect(tempRect);
        offsetDescendantRectToMyCoords(currentFocused, tempRect);

        return super.computeScrollDeltaToGetChildRectOnScreen(tempRect);
    }