android应用程序意外停止了模拟器

Question

无法找到错误。提供Logcat

03-22 00:08:15.677: E/dalvikvm(275): Could not find class 'net.sourceforge.jeval.Evaluator', referenced from method com.math.Mainactivitycalculator.onCreate
03-22 00:08:15.927: E/AndroidRuntime(275): FATAL EXCEPTION: main
03-22 00:08:15.927: E/AndroidRuntime(275): java.lang.NoClassDefFoundError: net.sourceforge.jeval.Evaluator 
03-22 00:08:15.927: E/AndroidRuntime(275): at com.dbl.dothemath.Mainactivitycalculator.onCreate(Mainactivitycalculator.java:76) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.os.Looper.loop(Looper.java:123) 
03-22 00:08:15.927: E/AndroidRuntime(275): at android.app.ActivityThread.main(ActivityThread.java:4627) 
03-22 00:08:15.927: E/AndroidRuntime(275): at java.lang.reflect.Method.invokeNative(Native Method) 
03-22 00:08:15.927: E/AndroidRuntime(275): at java.lang.reflect.Method.invoke(Method.java:521) 
03-22 00:08:15.927: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
03-22 00:08:15.927: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
03-22 00:08:15.927: E/AndroidRuntime(275): at dalvik.system.NativeStart.main(Native Method)

Answer 1

涉及数字的数学表达式。  数字被视为双精度数，因此结果数字将包含至少一个小数位。   string String也可以加在一起，比较等等......     Boolean表达式，计算结果为true（1.0）和false（0.0）。     功能可以创建自定义函数，或者JEval为此类提供许多Math和String函数。