android - IllegalStateException: Could not execute method of the activity -

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can explain me why i'm getting java.lang.illegalstateexception: not execute method of activity when trying click button data database?

my xml code has onclick this:

<button         android:layout_width="0dip"         android:layout_height="wrap_content"         android:text="delete"         android:id="@+id/btndelete"         android:layout_weight="1"         android:onclick="onclick_deleteall"/>

my mainactivity code:

public void onclick_deleteall(view view){     dbtools dbtools = new dbtools(getapplicationcontext())     float total = dbtools.total(); }

my database class(dbtools.java) code:

public float total(){     float total = 0;     sqlitedatabase db = getreadabledatabase();     cursor cursor = db.rawquery("select sum("+ price +") " + table_item_sell, null);     if (cursor.movetofirst()){         total = float.parsefloat(cursor.getstring(0));     }      return total; }


don't know what's wrong because happens when method try execute return data. code above, returns float.

error:

java.lang.illegalstateexception: not execute method of activity         @ android.view.view$1.onclick(view.java:3591)         @ android.view.view.performclick(view.java:4084)         @ android.view.view$performclick.run(view.java:16966)         @ android.os.handler.handlecallback(handler.java:615)         @ android.os.handler.dispatchmessage(handler.java:92)         @ android.os.looper.loop(looper.java:137)         @ android.app.activitythread.main(activitythread.java:4745)         @ java.lang.reflect.method.invokenative(native method)         @ java.lang.reflect.method.invoke(method.java:511)         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786)         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553)         @ dalvik.system.nativestart.main(native method)  caused by: java.lang.reflect.invocationtargetexception         @ java.lang.reflect.method.invokenative(native method)         @ java.lang.reflect.method.invoke(method.java:511)         @ android.view.view$1.onclick(view.java:3586) @ android.view.view.performclick(view.java:4084)             at android.view.view$performclick.run(view.java:16966)             at android.os.handler.handlecallback(handler.java:615)             at android.os.handler.dispatchmessage(handler.java:92)             at android.os.looper.loop(looper.java:137)             at android.app.activitythread.main(activitythread.java:4745)             at java.lang.reflect.method.invokenative(native method)             at java.lang.reflect.method.invoke(method.java:511)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:553)             at dalvik.system.nativestart.main(native method)      caused by: java.lang.nullpointerexception             @ java.lang.stringtoreal.parsefloat(stringtoreal.java:285)             @ java.lang.float.parsefloat(float.java:300)             @ com.jcarlapp.carl.amystore.dbtools.total(dbtools.java:151)             @ com.jcarlapp.carl.amystore.mainactivity.onclick_deleteall(mainactivity.java:306)             at java.lang.reflect.method.invokenative(native method)             at java.lang.reflect.method.invoke(method.java:511)             at android.view.view$1.onclick(view.java:3586)             at android.view.view.performclick(view.java:4084)             at android.view.view$performclick.run(view.java:16966)             at android.os.handler.handlecallback(handler.java:615)             at android.os.handler.dispatchmessage(handler.java:92)             at android.os.looper.loop(looper.java:137)             at android.app.activitythread.main(activitythread.java:4745)             at java.lang.reflect.method.invokenative(native method)             at java.lang.reflect.method.invoke(method.java:511)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:553)             at dalvik.system.nativestart.main(native method)

it caused npe

caused by: java.lang.nullpointerexception             @ java.lang.stringtoreal.parsefloat(stringtoreal.java:285)             @ java.lang.float.parsefloat(float.java:300)             @ com.jcarlapp.carl.amystore.dbtools.total(dbtools.java:151)

it seems cursor.getstring(0) returns null in method total.

i assume have no rows in table calculate sum.


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