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  1. ,

    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

  2. ,

    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

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java.lang.NumberFormatException: Invalid int: ""	at java.lang.Integer.invalidInt(Integer.java:137)	at java.lang.Integer.parseInt(Integer.java:358)	at java.lang.Integer.parseInt(Integer.java:331)	at com.logixor.advancedcalc.MainActivity.calc(MainActivity.java:30)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)	at android.view.View.performClick(View.java:4640)	at android.view.View$PerformClick.run(View.java:19425)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:146)	at android.app.ActivityThread.main(ActivityThread.java:5593)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)	at dalvik.system.NativeStart.main(Native Method)