当嵌入 HorizontalScrollView 中时,我的自定义视图不可见
我知道很多人都遇到过类似的问题,但我找不到解决方案。我创建了一个扩展 SurfaceView 的自定义视图。当我使用时,这个视图工作得很好:
setContentView(graphView);
但是我希望它嵌入到 HorizontalScrollView 中。如果我尝试使用 xml 执行此操作:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<HorizontalScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true">
<com.stuff.graph.GraphView
android:id="@+id/graph"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</HorizontalScrollView>
</FrameLayout>
然后我会收到致命异常,并且我的应用程序将关闭。
如果我尝试通过以下方式以编程方式解决此问题:
graphView = new GraphView(this);
graphView.setVisibility(View.VISIBLE);
myScrollView = new HorizontalScrollView(this);
graphView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
myScrollView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
myScrollView.addView(graphView);
setContentView(myScrollView);
那么屏幕就变成黑色了。我还尝试了上面显示的代码的许多变体,但没有成功。我哪里错了?
I know a lot of people have had similar issues to this but I cannot find a solution. I have created a custom View which extends SurfaceView. This view works perfectly when I use :
setContentView(graphView);
However I want it to be embedded inside a HorizontalScrollView. If I try this with xml with:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<HorizontalScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true">
<com.stuff.graph.GraphView
android:id="@+id/graph"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</HorizontalScrollView>
</FrameLayout>
Then I get a fatal exception and my application closes.
If I try to solve this programatically with:
graphView = new GraphView(this);
graphView.setVisibility(View.VISIBLE);
myScrollView = new HorizontalScrollView(this);
graphView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
myScrollView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
myScrollView.addView(graphView);
setContentView(myScrollView);
Then the screen is just black. I've also tried many variations on the code shown above but none have been successful. Where am I going wrong?
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您应该能够在 xml 中获取它,没有问题 - 尝试将自定义图形视图嵌入滚动视图内的 ListView 中;根据我使用horizontalScrollView的经验,他们往往对内容非常挑剔。如果这不起作用,请尝试测试框架视图是否存在问题。只需向水平滚动视图添加一个按钮,看看是否可以显示该按钮。如果没有,则尝试显示框架时出现问题,并且与您的自定义代码无关。
You should be able to get it in xml no problem - try embedding your custom graph view inside a ListView inside the scroll view; in my experience with horizontalScrollView they tend to be very pick about their contents. If that doesn't work, try testing to see if there is a problem with the frame view. Just add a button to the horizontal scroll view and see if you can get that to show up. If not, then there is a problem trying to display the frame, and it has nothing to do with your custom code.
事实证明,这并不是解决此问题的真正方法:
http ://www.mail-archive.com/[email protected]/msg45804.html
我的解决方案是我不会使用SurfaceView,相反,我可能会绘制位图并将其放入图像视图中,然后将其放入 ScrollView 中。
Turns out this isn't really the way to solve this issue:
http://www.mail-archive.com/[email protected]/msg45804.html
My solution is that I'm not going to use SurfaceView, instead I'm probably going to draw to a Bitmap and put that in an imageview which I can then put inside a ScrollView.