Android开发中遇到问题

一、Android View

1.1 代码中设置layout_behavior

CoordinatorLayout.LayoutParams lp=(CoordinatorLayout.LayoutParams)getAppBarLayout().getLayoutParams();
lp.setBehavior(new AdaptiveBehavior());

1.2 可设置最大高度AdaptiveHeightScrollView

class AdaptiveHeightScrollView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : ScrollView(context, attrs, defStyleAttr) {
    private var mMaxHeight = 0

    init {
        val typedArray = context.obtainStyledAttributes(attrs, R.styleable.AdaptiveHeightScrollView)
        mMaxHeight=typedArray.getLayoutDimension(R.styleable.AdaptiveHeightScrollView_maxHeight, mMaxHeight)
        typedArray.recycle()
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        var mHeightMeasureSpec=heightMeasureSpec
        if (mMaxHeight>0){
            mHeightMeasureSpec=MeasureSpec.makeMeasureSpec(mMaxHeight,MeasureSpec.AT_MOST)
        }
        super.onMeasure(widthMeasureSpec, mHeightMeasureSpec)
    }
}

android:scrollbars=“vertical” xml中需要设置，不然滚动条不显示