Attempt to invoke virtual method 'void com.kevin.zhang.minutes.myChart.MyYAxis.setAxisMaxValue(float)' on a null object reference

[ZhangKuixun]

06-25 10:45:19.645 332-332/com.kevin.zhang E/AndroidRuntime: FATAL EXCEPTION: main Process: com.kevin.zhang, PID: 332 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kevin.zhang/com.kevin.zhang.minutes.MinutesActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.kevin.zhang.minutes.myChart.MyYAxis.setAxisMaxValue(float)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.kevin.zhang.minutes.myChart.MyYAxis.setAxisMaxValue(float)' on a null object reference at com.kevin.zhang.minutes.MinutesActivity.setData(MinutesActivity.java:245) at com.kevin.zhang.minutes.MinutesActivity.getOffLineData(MinutesActivity.java:355) at com.kevin.zhang.minutes.MinutesActivity.onCreate(MinutesActivity.java:78) at android.app.Activity.performCreate(Activity.java:6664) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)  at android.app.ActivityThread.-wrap12(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:154)  at android.app.ActivityThread.main(ActivityThread.java:6077)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 

public class MyBarChart extends BarChart { ... @Override public MyXAxis getXAxis() { XAxis xAxis = super.getXAxis(); MyXAxis xAxis1 = (MyXAxis) xAxis;//error return xAxis1; } ... }

我使用的MPAndroidChart版本是3.0.3

[ZhangKuixun]

@AndroidJiang

[wsz9903011]

3.03 改了很多东西 有些去掉的方法 不是复制回去就可以的。