问题描述
我刚刚开始在 Mono for Android 上使用 Steema TChart.我试过这个简单的代码，效果很好:
I have just started using Steema TChart on Mono for Android. I tried this simple code and it works fine:
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
var tChart1 = new Steema.TeeChart.TChart(this);
var bar1 = new Steema.TeeChart.Styles.Bar();
tChart1.Series.Add(bar1);
bar1.Add(3, "Pears", Color.Red);
bar1.Add(4, "Apples", Color.Blue);
bar1.Add(2, "Oranges", Color.Green);
var theme = new Steema.TeeChart.Themes.BlackIsBackTheme(tChart1.Chart);
theme.Apply();
SetContentView(tChart1);
}
...但是一旦我尝试将图表添加到另一个视图中，例如 LinearLayout，我就会收到错误宽度和高度必须 > 0".有大佬知道怎么解决吗?
...but as soon as I try adding the chart into another view, like a LinearLayout I get the error "width and height must be > 0". Does anyone know how to solve this?
这是我尝试过的代码(如果我只有 LinearLayout 和按钮，它就可以正常工作):
Here is the code that I tried (it works just fine if I only have the LinearLayout and the Button):
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
var tChart1 = new Steema.TeeChart.TChart(this);
var bar1 = new Steema.TeeChart.Styles.Bar();
tChart1.Series.Add(bar1);
bar1.Add(3, "Pears", Color.Red);
bar1.Add(4, "Apples", Color.Blue);
bar1.Add(2, "Oranges", Color.Green);
var theme = new Steema.TeeChart.Themes.BlackIsBackTheme(tChart1.Chart);
theme.Apply();
var container = new LinearLayout(this);
container.Orientation = Orientation.Vertical;
var b = new Button(this);
b.Text = "Test";
container.AddView(b);
container.AddView(tChart1);
SetContentView(container);
}
这是调用堆栈:
08-29 19:39:52.489 I/MonoDroid(24907): java.lang.IllegalArgumentException: width and height must be > 0
08-29 19:39:52.489 I/MonoDroid(24907): at android.graphics.Bitmap.createBitmap(Bitmap.java:603)
08-29 19:39:52.489 I/MonoDroid(24907): at android.graphics.Bitmap.createBitmap(Bitmap.java:585)
08-29 19:39:52.489 I/MonoDroid(24907): at steema.teechart.TChart.n_onDraw(Native Method)
08-29 19:39:52.489 I/MonoDroid(24907): at steema.teechart.TChart.onDraw(TChart.java:55)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.View.draw(View.java:11025)
08-29 19:39:52.489 I/MonoDroid(24907): at android.widget.FrameLayout.draw(FrameLayout.java:450)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.drawChild(ViewGroup.java:2887)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.drawChild(ViewGroup.java:2885)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.drawChild(ViewGroup.java:2885)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.drawChild(ViewGroup.java:2885)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2489)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.View.draw(View.java:11028)
08-29 19:39:52.489 I/MonoDroid(24907): at android.widget.FrameLayout.draw(FrameLayout.java:450)
08-29 19:39:52.489 I/MonoDroid(24907): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2274)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewRootImpl.draw(ViewRootImpl.java:2041)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1647)
08-29 19:39:52.489 I/MonoDroid(24907): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2459)
08-29 19:39:52.489 I/MonoDroid(24907): at android.os.Handler.dispatchMessage(Handler.java:99)
08-29 19:39:52.489 I/MonoDroid(24907): at android.os.Looper.loop(Looper.java:137)
08-29 19:39:52.489 I/MonoDroid(24907): at android.app.ActivityThread.main(ActivityThread.java:4514)
08-29 19:39:52.489 I/MonoDroid(24907): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 19:39:52.489 I/MonoDroid(24907): at java.lang.reflect.Method.invoke(Method.java:511)
08-29 19:39:52.489 I/MonoDroid(24907): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
08-29 19:39:52.489 I/MonoDroid(24907): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
08-29 19:39:52.489 I/MonoDroid(24907): at dalvik.system.NativeStart.main(Native Method)
推荐答案
这是因为你需要提供 LayoutParams 将图表添加到您的视图时，例如:
This is because you need to provide LayoutParams when adding the chart to your View, for example:
container.AddView(tChart1, new ViewGroup.LayoutParams(300, 400));
container.AddView(tChart1, new ViewGroup.LayoutParams(300, 400));
或:
container.AddView(tChart1, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.FillParent));
container.AddView(tChart1, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.FillParent));
这篇关于LinearLayout 内的 TChart 生成“宽度和高度必须>"0"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！