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Android Compute Grade

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This app program illustrates on how to compute student grade and display the computed average grade. It requires input (prelim, midterm, prefi and final) from the user.
How it works?
  1. Input prelim, midterm, prefi and final grades. (The input type will be set to number. It means character is not allowed.) 
  2. Click the button Calculate. (The calculation will be done using this formula avg=((p*.2)+(m*.2)+(pf*.2)+(f*.4)) 
  3. The calculated output displayed using toast. 
Requirements:
  • TextView (Prelim, Midterm, Prefinal nd Final) 
  • EditText (Prelim, Midterm, Prefinal nd Final) for input 
  • Button (Calculate) 
  • Toast (Output) 
  • Accepted values 65 to 100 
  • Empty field is not accepted 
Screenshot

Code snippet
Hint: declare double variables for d_pre, d_mid, d_prefi, d_final, ave

if (pre.getText().toString().trim().equals("")){
     Display_Message("Prelim");
}else if (mid.getText().toString().trim().equals("")){
     Display_Message("Midterm");
}else if (prefi.getText().toString().trim().equals("")){
     Display_Message("Prefi");
}else if (fin.getText().toString().trim().equals("")){
     Display_Message("Final");
}else {
//Code above validation for empty fields
//Declare also global double variables for p_pre, d_mid, d_prefi and d_final 
d_pre=Double.parseDouble(pre.getText().toString());
d_mid=Double.parseDouble(mid.getText().toString());
d_prefi=Double.parseDouble(prefi.getText().toString());
d_final=Double.parseDouble(fin.getText().toString());
//validation for the inputted value. 
}if((d_pre < 65) || (d_pre > 100)) {
       Display_Message("accepted value 65 - 100");}
else if((d_mid < 65) || (d_mid > 100)) {
       Display_Message("accepted value 65 - 100");}
else if((d_prefi < 65) || (d_prefi > 100)) {
       Display_Message("accepted value 65 - 100");}
else if((d_final < 65) || (d_final > 100)) {
       Display_Message("accepted value 65 - 100");}
else {
ave = (d_pre * .2) + d_mid * .2) + (d_prefi * .2) + (d_final * .4);
Display_Output();
//Code above validation for input value (65 - 100) and computation for GWA
}
public void Display_Output() {
     Toast toast = Toast.makeText(this, "Your average is :" + ave, Toast.LENGTH_LONG);
     toast.show();
}
public void Display_Message(String p) {
     Toast.makeText(this, "Invalid input" + p ".", Toast.LENGTH_LONG).show();
}
//Code above user define methods

XML (main)
<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <ScrollView 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" >
  <LinearLayout 
      android:orientation="vertical"
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content"> 

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/s_prelim" 
        android:textSize="20dp"
        android:gravity="center"/>
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:gravity="center"
        android:inputType="number"
        android:id="@+id/etPrelim" />
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/s_midterm" 
        android:textSize="20dp"
        android:gravity="center"/>
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:gravity="center"
        android:inputType="number"
        android:id="@+id/etMidterm"/>
     <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/s_prefi" 
        android:textSize="20dp"
        android:gravity="center"/>
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:gravity="center"
        android:inputType="number"
        android:id="@+id/etPrefi"/>
     <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/s_final" 
        android:textSize="20dp"
        android:gravity="center"/>
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:gravity="center"
        android:inputType="number"
        android:id="@+id/etFinal" />
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:gravity="center"
        android:text="@string/s_cal"
        android:id="@+id/btnCal" />
</LinearLayout>
</ScrollView>
</LinearLayout>

String.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="s_prelim">Prelim</string>
    <string name="s_midterm">Midterm</string>
    <string name="s_prefi">Prefi</string>
    <string name="s_final">Final</string>
    <string name="s_cal">Calculate</string>
    <string name="app_name">Activity2Android</string>

</resources>

Programming Language: Java + XML
Programming IDE: Eclipse
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