marginInfo 未设置时，addHighLight 未添加进去，导致显示时 crash

[wdeo3601]

报错日志如下：

Process Name: 'com.wln100.future.debug'
Thread Name: 'main'
Back traces starts.
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewGroup$LayoutParams android.view.View.getLayoutParams()' on a null object reference
	at zhy.com.highlight.view.HightLightView.buildTipLayoutParams(HightLightView.java:251)
	at zhy.com.highlight.view.HightLightView.updateTipPos(HightLightView.java:231)
	at zhy.com.highlight.view.HightLightView.onLayout(HightLightView.java:220)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:334)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1857)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1701)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1610)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:334)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1857)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1701)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1610)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at com.huawei.internal.widget.HwFreeFormCaptionView.onLayout(HwFreeFormCaptionView.java:859)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:334)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at com.android.internal.policy.DecorView.onLayout(DecorView.java:1144)
	at android.view.View.layout(View.java:22491)
	at android.view.ViewGroup.layout(ViewGroup.java:6528)
	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3743)
	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3207)
	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2166)
	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8884)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1280)
	at android.view.Choreographer.doCallbacks(Choreographer.java:1019)
	at android.view.Choreographer.doFrame(Choreographer.java:911)
	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1248)
	at android.os.Handler.handleCallback(Handler.java:900)
	at android.os.Handler.dispatchMessage(Handler.java:103)
	at android.os.Looper.loop(Looper.java:219)
	at android.app.ActivityThread.main(ActivityThread.java:8668)
	at java.lang.reflect.Method.invoke(Method.java)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1109)
Back traces ends.

我的高亮提示场景是不需要给高亮 View 扣矩形，且提示 View 需要在屏幕的顶部，添加高亮提示 View 的代码如下：

addHighLight(
            targetView,
            decorLayoutId,
            object : OnBottomPosCallback() {
                override fun getPosition(
                    rightMargin: Float,
                    bottomMargin: Float,
                    rectF: RectF?,
                    marginInfo: MarginInfo?,
                ) {
                    marginInfo?.rightMargin = 0f
                    marginInfo?.topMargin = rectF?.top
                }
            },
            object : RectLightShape() {
                override fun resetRectF4Shape(viewPosInfoRectF: RectF, dx: Float, dy: Float) {
                    viewPosInfoRectF.setEmpty()
                }
            }
        )

marginInfo 只设置了 top 的值，正常情况下，top 的值是状态栏的高度，此时 marginInfo 里是有值的，高亮 View 可以正常显示；当使用鸿蒙平板的小窗模式后，因为小窗脱离状态栏了，所以 top 值就成 0 了，此时 marginInfo 里的值都为 0，在调用 HighLight.show() 后，之后的调用链会走到 HighLightView.addViewForEveryTip()，这个方法中因为 marginInfo 都是 0，所以这里 LayoutParams 会返回 null，直接 return 了，没添加上高亮布局，导致现实的时候 crash 了：

    //HighLight .java
    @Override
    public HighLight show() {
        ...
        //延迟添加提示布局
        hightLightView.addViewForTip();
        ...
        return this;
    }

   //HighLightView.java
    public void addViewForTip()
    {
        if (isNext)
        {
           ...
            mViewPosInfo = mViewRects.get(mPosition);
            //移除所有tip再添加当前位置的tip布局
            removeAllTips();
            addViewForEveryTip(mViewPosInfo);
           ...
        } else
        {
            ...
        }
    }

    //HighLightView.java
    private void addViewForEveryTip(HighLight.ViewPosInfo viewPosInfo)
    {
        View view = mInflater.inflate(viewPosInfo.layoutId, this, false);
        ...
        LayoutParams lp = buildTipLayoutParams(view, viewPosInfo);
        if (lp == null) return;  //这里直接返回了，没有添加 View，导致 crash
        ...
        addView(view, lp);
    }

    //HighLightView.java
    private LayoutParams buildTipLayoutParams(View view, HighLight.ViewPosInfo viewPosInfo)
    {
        LayoutParams lp = (LayoutParams) view.getLayoutParams();
        if (lp.leftMargin == (int) viewPosInfo.marginInfo.leftMargin &&
                lp.topMargin == (int) viewPosInfo.marginInfo.topMargin &&
                lp.rightMargin == (int) viewPosInfo.marginInfo.rightMargin &&
                lp.bottomMargin == (int) viewPosInfo.marginInfo.bottomMargin) return null; //因为 marginInfo 都是 0，走到这个条件中返回了 null

        ...
        return lp;
    }

以上调用链，注释中解释了 crash 的原因。
我的解决方案是，在 addViewForEveryTip 中，不再调用 buildTipLayoutParams 方法，去掉 null 的判断，直接把 marginInfo 的值赋给 LayoutParams，保证 addView 可以调用到：

    //HighLightView.java
    private void addViewForEveryTip(HighLight.ViewPosInfo viewPosInfo)
    {
        View view = mInflater.inflate(viewPosInfo.layoutId, this, false);
        //设置id为layout id 供HighLight查找
        view.setId(viewPosInfo.layoutId);

        LayoutParams lp = (LayoutParams) view.getLayoutParams();

        lp.leftMargin = (int) viewPosInfo.marginInfo.leftMargin;
        lp.topMargin = (int) viewPosInfo.marginInfo.topMargin;
        lp.rightMargin = (int) viewPosInfo.marginInfo.rightMargin;
        lp.bottomMargin = (int) viewPosInfo.marginInfo.bottomMargin;

        //fix the bug can't set gravity  LEFT|BOTTOM  or RIGHT|TOP
//            if (lp.leftMargin == 0 && lp.topMargin == 0)
//            {
//                lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;
//            }

        if(lp.rightMargin != 0){
            lp.gravity = Gravity.RIGHT;
        }else {
            lp.gravity = Gravity.LEFT;
        }

        if(lp.bottomMargin != 0){
            lp.gravity |= Gravity.BOTTOM;
        }else {
            lp.gravity |= Gravity.TOP;
        }
        addView(view, lp);
    }