自定义视图不显示动态添加 [英] Custom View Not Showing When Dynamically Added

问题描述

在这里亏损。搜索广泛，找不到这个问题的答案...

我有一个XML布局，我有一个相对的布局，我用作一个地方持有人的不同意见。

 < RelativeLayout 
 android：id =@ + id / relVariableLayoutPlaceHolder
 
 android：layout_width =match_parent
 android：layout_height =0dp
 android：layout_weight =1
 
 android：background =@ color /白色
> 
 
< / RelativeLayout> 
  

在我的活动中，我有一个按钮供用户按，当他们按它，我想要创建并动态添加的定制 ClockView 请注意， _variableLayout 在 onCreate 方法中完美设置：

  public void onStartTimeClick（View view）
 {
 //清理任何剩余的视图
 _variableLayout.removeAllViews（）; 
 
 //添加时钟视图
 ClockView clockView = new ClockView（_context）; 
 _variableLayout.addView（clockView）; 
} 
  

问题是当按下按钮时，屏幕上没有任何反应。我可以看到它，当我点击一个 TextView 也是在屏幕上。

我上传了一些图像之前和之后点击 TextView ：
http://imgur.com/a/9lebv

我可以想象，这与在时钟视图绘制后不被刷新的屏幕有关但是我已经尝试过 invalidate（）和 requestLayout（）的所有组合。任何想法？

解决方案

为了历史的目的，我觉得我应该提到，经过很多调试，我发现我的问题在 onMeasure 和 onLayout 功能的 ClockView 中。基本上，他们的形式不好，没有正确地评估 onLayout 函数的子视图正确处理。

一旦我得到了这些消息，一切都按预期工作。

At a loss here. Searched far and wide and can't find an answer to this question...

I have an XML layout where I have a relative layout that I am using as a place holder for different views.

<RelativeLayout
    android:id="@+id/relVariableLayoutPlaceHolder"

    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"

    android:background="@color/white"
    >

</RelativeLayout>

In my activity, I have a button for the user to press and when they press it, I want the custom ClockView to be created and dynamically added. Note that the _variableLayout is setting perfectly in the onCreate method:

public void onStartTimeClick(View view)
{
    //Clean up any left over views
    _variableLayout.removeAllViews();

    //Add clock view
    ClockView clockView = new ClockView(_context);
    _variableLayout.addView(clockView);
}

Problem is that when the button is pressed, nothing happens on the screen. I can, however see it when I tap a TextView that is also on the screen.

I uploaded some images here of the before and after clicking the TextView: http://imgur.com/a/9lebv

I would imagine this has something to do with the screen not being refreshed after the clock view is drawn but I have tried every combination of invalidate() and requestLayout() I can think of. Any ideas?

解决方案

For historical purposes, I felt that I should mention that after a lot of debugging I figured out that my problem was in the onMeasure and onLayout functions of the ClockView. Basically they were poorly formed and not measuing the subviews properly for the onLayout function to handle properly.

Once I got those ironed out, everything was working as expected.

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