java - Application Crashed when I tried to compare integers -


here codes

public void onclick(view v) {     if (v == buttonone)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("1");     }      else if (v == buttontwo)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("2");     }      else if (v == buttonthree)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("3");     }      else if (v == buttonfour)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("4");     }      else if (v == buttonfive)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("5");     }      else if (v == buttonsix)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("6");     }      else if (v == buttonseven)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("7");     }      else if (v == buttoneight)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("8");     }      else if (v == buttonnine)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("9");     }      else if (v == buttonzero)     {         textview output = (textview)findviewbyid(r.id.output);         output.append("0");     }      else if(v == buttonenter)     {          textview output = (textview)findviewbyid(r.id.output);         temp = integer.parseint(output.gettext().tostring());         comparenumber(temp);         output.settext("");     } }

i trying compare number using button. example, if press buttonone append 1 stack. works fine when enter pressed after 1 or more number clicked, application stops when left edittext without entering numbers , press buttonenter.

please help!

the problem @ line

temp = integer.parseint(output.gettext().tostring());

when try use parseint() empty string. crash up. have @ variable output.

solution

you can apply condition before doing value retrieved edittext adding line

if(edittext.gettext().length() != 0)

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