Tag: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.simplecal/com.example.simplecal.MainActivity}: java.lang.NumberFormatException: Invalid float: “”

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.simplecal/com.example.simplecal.MainActivity}: java.lang.NumberFormatException: Invalid float: “” a = Float.valueOf(edt1.getText().toString()); b = Float.valueOf(edt2.getText().toString());