Simple Math Equations in Android App - math

Question

This is my first time posting, and after trying several different versions of solutions, I'm at the point where I think what I'm asking for is a bit beyond what I'm able to do at this point.
I am currently creating a simple app for my company that will be used as a sales tool. In my industry, it would be immensely helpful for the salesman in the field to be able to enter dimensions to get quick quotes for the customer.
What I am looking to try and do is to have a text field that will allow the salesperson to enter L (length), W (width), and D (depth).
Behind the scenes (java) the L would go through a simple math equation that takes into account predetermined allowances. The answer would then be put into a results area that would let them know the blank size of the project.
ex. L = 8.0625 ---> ((D*2)+.125)*2 + L ---> Blank Length = 14.625
I realize that may seem a little confusing, but it really is just supposed to be a simple equation that uses user entered information, adding to a static equation, and then posting the results on the same page.
EDIT: I solved aspects of it, but now I'm getting a crash as I try to go from whole numbers to decimals. I can do 6 as an input, but not 6.25. Any advice?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_test4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.design.test4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="Length"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:textSize="20dp"
android:id="#+id/length1"
android:gravity="right"
android:hint="Enter" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:paddingRight="30dp"
android:text="Width"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:textSize="20dp"
android:id="#+id/width1"
android:gravity="right"
android:hint="Enter" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:paddingRight="30dp"
android:text="Depth"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:textSize="20dp"
android:id="#+id/depth1"
android:gravity="right"
android:hint="Enter" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:text="B Flute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/button"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:onClick="onButtonClick1" />
<Button
android:text="C Flute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/button2"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:onClick="onButtonClick2" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:paddingRight="30dp"
android:text="Blank Width"/>
<TextView
android:text="Answer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/depth1"
android:textSize="20dp"
android:gravity="right"
android:id="#+id/blank_width1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:paddingRight="30dp"
android:text="Blank Length"/>
<TextView
android:text="Answer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="right"
android:textSize="20dp"
android:id="#+id/blank_length1" />
</LinearLayout>
</LinearLayout>
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test4);
}
double ba_width = (2.625);
double ba_length = (.625);
public void onButtonClick1(View v){
EditText e1 = (EditText)findViewById(R.id.length1);
EditText e2 = (EditText)findViewById(R.id.width1);
EditText e3 = (EditText)findViewById(R.id.depth1);
TextView t1 = (TextView)findViewById(R.id.blank_width1);
TextView t2 = (TextView)findViewById(R.id.blank_length1);
double num1 = Integer.parseInt(e1.getText().toString());
double num2 = Integer.parseInt(e2.getText().toString());
double num3 = Integer.parseInt(e3.getText().toString());
double sum1 = num1 + (num3 + num3 + ba_width);
double sum2 = num2 + (num3 + num2 + num3 + num2 + num3 + ba_length);
t1.setText(Double.toString(sum1));
t2.setText(Double.toString(sum2));
}
double ca_width = (3.25);
double ca_length = (.6875);
public void onButtonClick2(View v) {
EditText e1 = (EditText) findViewById(R.id.length1);
EditText e2 = (EditText) findViewById(R.id.width1);
EditText e3 = (EditText) findViewById(R.id.depth1);
TextView t1 = (TextView) findViewById(R.id.blank_width1);
TextView t2 = (TextView) findViewById(R.id.blank_length1);
double num1 = Integer.parseInt(e1.getText().toString());
double num2 = Integer.parseInt(e2.getText().toString());
double num3 = Integer.parseInt(e3.getText().toString());
double sum1 = num1 + (num3 + num3 + ca_width);
double sum2 = num2 + (num3 + num2 + num3 + num2 + num3 + ca_length);
t1.setText(Double.toString(sum1));
t2.setText(Double.toString(sum2));
}
}