Question

我刚开始在Mono上使用Steema TChart for Android。我尝试了这个简单的代码，它工作正常：

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，就像LinearLayout一样，我得到错误“宽度和高度必须> 0 ”。有谁知道如何解决这个问题？

这是我尝试的代码（如果我只有LinearLayout和Button，它可以正常工作）：

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CallStack：

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)

Answer 1

这是因为您需要在将图表添加到视图时提供LayoutParams，例如：

container.AddView（tChart1，new ViewGroup.LayoutParams（300,400））;

或：

container.AddView（tChart1，new ViewGroup.LayoutParams（ViewGroup.LayoutParams.FillParent，ViewGroup.LayoutParams.FillParent））;

LinearLayout中的TChart生成“宽度和高度必须> 0”

1 个答案: