Java 得到一个；非法初始容量错误“；

创建graphView（）后获取此错误。我认为这与graphView（）有关。奇怪的是，前一段时间一切都很好，然后我添加了两个新的活动，效果很好

这就是错误：

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.weightogo, PID: 10342
                  java.lang.IllegalArgumentException: Illegal initial capacity: -4
                      at java.util.HashMap.<init>(HashMap.java:448)
                      at java.util.HashMap.<init>(HashMap.java:467)
                      at java.util.LinkedHashMap.<init>(LinkedHashMap.java:383)
                      at com.jjoe64.graphview.GridLabelRenderer.adjustHorizontal(GridLabelRenderer.java:947)
                      at com.jjoe64.graphview.GridLabelRenderer.adjustSteps(GridLabelRenderer.java:980)
                      at com.jjoe64.graphview.GridLabelRenderer.draw(GridLabelRenderer.java:1113)
                      at com.jjoe64.graphview.GraphView.drawGraphElements(GraphView.java:307)
                      at com.jjoe64.graphview.GridLabelRenderer.draw(GridLabelRenderer.java:1108)
                      at com.jjoe64.graphview.GraphView.drawGraphElements(GraphView.java:307)
                      at com.jjoe64.graphview.GraphView.onDraw(GraphView.java:336)
                      at android.view.View.draw(View.java:19192)
                      at android.view.View.updateDisplayListIfDirty(View.java:18142)
                      at android.view.View.draw(View.java:18920)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
                      at android.support.constraint.ConstraintLayout.dispatchDraw(ConstraintLayout.java:1963)
                      at android.view.View.updateDisplayListIfDirty(View.java:18133)
                      at android.view.View.draw(View.java:18920)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
                      at android.view.View.updateDisplayListIfDirty(View.java:18133)
                      at android.view.View.draw(View.java:18920)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
                      at android.view.View.updateDisplayListIfDirty(View.java:18133)
                      at android.view.View.draw(View.java:18920)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
                      at android.view.View.updateDisplayListIfDirty(View.java:18133)
                      at android.view.View.draw(View.java:18920)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
                      at android.view.View.updateDisplayListIfDirty(View.java:18133)
                      at android.view.View.draw(View.java:18920)
                      at android.view.ViewGroup.drawChild(ViewGroup.java:4236)
                      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4022)
                      at android.view.View.draw(View.java:19195)
                      at com.android.internal.policy.DecorView.draw(DecorView.java:788)
                      at android.view.View.updateDisplayListIfDirty(View.java:18142)
                      at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:669)
                      at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:675)
                      at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:783)
                      at android.view.ViewRootImpl.draw(ViewRootImpl.java:2992)
                      at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2806)
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2359)
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1392)
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6752)
                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
                      at android.view.Choreographer.doCallbacks(Choreographer.java:723)
                      at android.view.Choreographer.doFrame(Choreographer.java:658)
                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
                      at android.os.Handler.handleCallback(Handler.java:790)
                      at android.os.Handler.dispatchMessage(Handler.java:99)
                      at android.os.Looper.loop(Looper.java:164)
                      at android.app.ActivityThread.main(ActivityThread.java:6494)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

---

我在使用graphview库时出错。对我来说，它发生在

.setMaxX

小于

.setMinX

时，因为图形轴范围不能为负值。您需要确保用于设置轴的代码不允许

.setMinX

大于

.setMaxX

。你在哪里

if(HiProfWang.size() < 7){
graph.getViewport().setMinX(1);
        }

if（HiProfWang.size（）<7）{
graph.getViewport（）.setMinX（1）；
}

如果

HiProfWang.size（）

返回0，则

setMaxX

可能小于

.setMinX（1）

---

我不确定如果minX和maxX相等，行为会是什么

这并不能回答这个问题。一旦你有足够的钱，你将能够；相反关于check

，我需要澄清什么。setMinX

小于

。setMaxX

？除非您完全确定这可以解决问题，否则您应该将您的经验作为评论而不是答案发布。

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        weightButton = (Button) findViewById(R.id.weightButton);
        displayDifference = (TextView) findViewById(R.id.displayDifference);
        displayAverage = (TextView) findViewById(R.id.displayAverage);
        displayWeight = (TextView) findViewById(R.id.displayWeight);
        ccButton = (Button) findViewById(R.id.ccButton);
        initWeight();
        initCalorieCounter();
        displayUserWeight();
        displayWeightAverage();
        buildGraph();
    }

if(HiProfWang.size() < 7){
graph.getViewport().setMinX(1);
        }