java - 如果然后使用微调器显示的值

Question

我在运行时得到 FC，但它可以编译。

注意:根据 Rasel 的评论进行了更改。还是FC的

                        btnExecute.setOnClickListener(new View.OnClickListener() //this worked
        {
            private AlertDialog show;
            public void onClick(View arg0) 
            { //start of get stack shape and provide area and equivalent diameter
              //20110720
              //just trying to evaluate the shape to use the correct inputs for area calculation
              //I will then add and evaluate for the units of input to build universal
              //values(_eng and _met)variables to use for all further calculations. KISS!

                if (((m1_ss_spinner.getSelectedItem().toString().equals("Square")))) //cant compare a string with == operator.  Use equals() to compare
                {
                    if ((m1_sqs1.getText().length() == 0)              //if m1_sqs1 is empty
                        || (m1_sqs1.getText().toString().equals("")))  //if m1_sqs1 is blank
                    {           
                            show = new AlertDialog.Builder(mContext).setTitle("Error") //this worked
                                .setMessage("The Square Side length is empty")               
                                .setPositiveButton("OK", null).show();          
                    } else
                        {
                            double result = new Double(m1_sqs1.getText().toString()) * new Double(m1_sqs1.getText().toString());   
                            m1_sa_in.setText(Double.toString(result));
                        } //end of square area
                } else      

                    if (((m1_ss_spinner.getSelectedItem().toString().equals("Rectangle"))))
                    {
                        if ((m1_rs1.getText().length() == 0)
                            || (m1_rs1.getText().toString().equals("")
                            || (m1_rs2.getText().length() == 0)
                            || (m1_rs2.getText().toString().equals(""))))
                        {
                                show = new AlertDialog.Builder(mContext).setTitle("Error")
                                .setMessage("A Rectangle Side length is empty")               
                                .setPositiveButton("OK", null).show();
                        } else 
                            {
                                double result = new Double(m1_rs1.getText().toString()) * new Double(m1_rs2.getText().toString());   
                                m1_sa_in.setText(Double.toString(result));
                            } //end of rectangle area
                } else

                    if (((m1_ss_spinner.getSelectedItem().toString().equals("Circle"))))
                    {
                        if ((m1_cd.getText().length() == 0)            
                            || (m1_cd.getText().toString().equals("")))
                        {
                                show = new AlertDialog.Builder(mContext).setTitle("Error")
                                .setMessage("The Circle Diameter is empty")               
                                .setPositiveButton("OK", null).show();
                        } else 
                            {
                                double result = new Double(m1_cd.getText().toString()) * new Double(m1_cd.getText().toString());   
                                m1_sa_in.setText(Double.toString(result));
                            } //end of circle area
                } else

                        if (((m1_ss_spinner.getSelectedItem().toString().equals("Elliptical")))) 
                        {
                            if ((m1_els1.getText().length() == 0)           
                            || (m1_els1.getText().toString().equals("")
                            || (m1_els2.getText().length() == 0)
                            || (m1_els2.getText().toString().equals(""))))
                            {
                                show = new AlertDialog.Builder(mContext).setTitle("Error")
                                .setMessage("An Elliptical Diameter is empty")               
                                .setPositiveButton("OK", null).show();
                        } else 
                            {
                                double result = new Double(m1_els1.getText().toString()) * new Double(m1_els2.getText().toString());   
                                m1_sa_in.setText(Double.toString(result));
                            }; //end of elliptical area
                    } // end of onClick code
                }
        });

Answer 1

不能用 == 运算符比较字符串。请使用 equals() 方法进行比较。尝试这样

 if (((m1_ss_spinner.getSelectedItem().toString().equals("Square")))) //need to prove this

                    {

                        if ((m1_sqs1.getText().length() == 0)           //if m1_sqs1 is empty
                            || (m1_sqs1.getText().toString().equals("")))   //if m1_sqs1 is blank