使Horizo​​ntalScrollView的子项与屏幕一样大？

Question

我解决此问题的方法是为子视图创建自定义视图，然后覆盖自定义视图的onMeasure（）。新的onMeasure（）将宽度和高度设置得尽可能大。

问题是当您显示软键盘和旋转手机时。随着方向更改和键盘显示，onMeasure（）将“最大”可用高度设置为可笑的小，因此当我隐藏键盘时，子视图的大小不正确。

当键盘消失时，有没有办法告诉视图重新计算布局？或者我在onMeasure（）上做错了吗？这是代码：

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

    int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
    int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
    setMeasuredDimension(measureWidth(widthMeasureSpec), 
                         measureHeight(heightMeasureSpec));

    setLayoutParams(new LinearLayout.LayoutParams(
           measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec))
    );

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

public int measureWidth(int measureSpec) {
    int result = 0;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);
    Display display = ( (WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); 
    int screenWidth = display.getWidth();

    if (specMode == MeasureSpec.EXACTLY) {
        // We were told how big to be
        result = specSize;
    } else {
        // Measure the view
        result = screenWidth;
        if (specMode == MeasureSpec.AT_MOST) {
            // Respect AT_MOST value if that was what is called for by measureSpec
            result = Math.min(result, specSize);
        }
    }
    Log.d(TAG, "Width: "+String.valueOf(result));

    return result;
}

measureHeight（）以同样的方式完成。

Answer 1

你的super.onMeasure（widthMeasureSpec，heightMeasureSpec）使用传入的值，我认为你希望这些值是实际测量的宽度和高度：

super.onMeasure(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec));