java.lang.RuntimeException:アクティビティを開始できませんComponentInfo {com.project / com.project.simple}:java.lang.NumberFormatException
EditText et1,et2,et3;
Button b1, b2;
Float two,three,four;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.can);
et1 = (EditText) findViewById(R.id.editText1);
two = Float.valueOf(et1.getText().toString());
et2 = (EditText) findViewById(R.id.editText2);
three = Float.valueOf(et2.getText().toString());
et3 = (EditText) findViewById(R.id.editText3);
four = Float.valueOf(et3.getText().toString());
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
b1.setOnClickListener(new OnClickListener() {