如何使用 Kotlin 在 android 中添加图表视图？

Question

以下是我在 Kotlin 中尝试的一个简单的图形视图代码。但它不能正常工作。运行 .

时应用程序崩溃

 `lateinit var series: LineGraphSeries<DataPoint>
 var x : Double = 0.0;  var y : Double = 0.0`

创建

var graphview : GraphView = findViewById(R.id.graphview) as GraphView

        series = LineGraphSeries<DataPoint>()


        x = -0.5

        for (i in 0..500)
        {
            x += 0.1
            y = Math.sinh(x)
            series.appendData(DataPoint(x,y), true, 500)
        }


        graphview.addSeries(series)

错误日志

 FATAL EXCEPTION: main
                                                                                   Process: com.example.sarath.mykotinapplication, PID: 18986
                                                                                   java.lang.OutOfMemoryError: Failed to allocate a 1073741836 byte allocation with 13311040 free bytes and 172MB until OOM
                                                                                       at java.util.HashMap.inflateTable(HashMap.java:287)
                                                                                       at java.util.HashMap.put(HashMap.java:419)
                                                                                       at com.jjoe64.graphview.GridLabelRenderer.adjustVertical(GridLabelRenderer.java:791)
                                                                                       at com.jjoe64.graphview.GridLabelRenderer.adjustSteps(GridLabelRenderer.java:932)
                                                                                       at com.jjoe64.graphview.GridLabelRenderer.draw(GridLabelRenderer.java:1067)
                                                                                       at com.jjoe64.graphview.GraphView.drawGraphElements(GraphView.java:299)
                                                                                       at com.jjoe64.graphview.GridLabelRenderer.draw(GridLabelRenderer.java:1062)
                                                                                       at com.jjoe64.graphview.GraphView.drawGraphElements(GraphView.java:299)
                                                                                       at com.jjoe64.graphview.GraphView.onDraw(GraphView.java:323)
                                                                                       at android.view.View.draw(View.java:17077)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16059)
                                                                                       at android.view.View.draw(View.java:16843)
                                                                                       at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
                                                                                       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16054)
                                                                                       at android.view.View.draw(View.java:16843)
                                                                                       at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
                                                                                       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16054)
                                                                                       at android.view.View.draw(View.java:16843)
                                                                                       at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
                                                                                       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16054)
                                                                                       at android.view.View.draw(View.java:16843)
                                                                                       at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
                                                                                       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16054)
                                                                                       at android.view.View.draw(View.java:16843)
                                                                                       at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
                                                                                       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16054)
                                                                                       at android.view.View.draw(View.java:16843)
                                                                                       at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
                                                                                       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
                                                                                       at android.view.View.draw(View.java:17080)
                                                                                       at com.android.internal.policy.DecorView.draw(DecorView.java:751)
                                                                                       at android.view.View.updateDisplayListIfDirty(View.java:16059)
                                                                                       at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:656)
                                                                                       at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:662)
                                                                                       at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:770)
                                                                                       at android.view.ViewRootImpl.draw(ViewRootImpl.java:2841)
                                                                                       at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2649)
                                                                                       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2256)
                                                                                       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1291)
                                                                                       at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6357)
                                                                                       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:873)
                                                                                       at android.view.Choreographer.doCallbacks(Choreographer.java:685)
                                                                                       at android.view.Choreographer.doFrame(Choreographer.java:621)
                                                                                       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:859)
                                                                                       at android.os.Handler.handleCallback(Handler.java:751)
                                                                                       at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                       at android.os.Looper.loop(Looper.java:154)
                                                                                       at android.app.ActivityThread.main(ActivityThread.java:6195)
                                                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:874)
                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:764)

08-21 10:56:32.022 18986-18986/com.example.sarath.mykotinapplication E/MQSEventManagerDelegate: 获取 MQSService 失败。

有代码错误吗？正在学习中，期待专家对kotlin的建议

Answer 1

Math.sinh(x) 方法是问题所在。我为 sin(x)，拼写错误做好了准备。上面的代码工作正常，y 值略有变化。将 y=Math.sinh(x) 更改为 y=Math.sin(x) 。我在这里使用可用的 Graphview 库 here。希望这会对某人有所帮助。谢谢

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