Adding a tab to the Product Display layout file

In this lesson, you update the product display page to include a warranty tab. When shoppers click the warranty tab, a new page opens with the warranty information of the product.

About this task

In the Android native application, the page layout is specified in an XML file and the logic is provided by a Java Activity class. Layouts are stored in the resource folder and activities are in the package.


  1. In the Package Explorer view, navigate to src > res > values.
  2. Open the file strings.xml. This file is the main file for store labels. Translated versions of this file can be found in the corresponding locale-specific values folders.
    For example, values-fr.
  3. Append the following string resource to the end of the file, right before </resources>:
    <!-- Warranty -->
    	<string name="Warranty">Warranty</string>
    	<string name="WarrantyTerm">WarrantyTerm</string>
    	<string name="WarrantyType">WarrantyType</string>
    	<string name="Warranty1">WarrantyTerm: </string>
    <string name="Warranty2">WarrantyType: </string> 
  4. Save your changes and close the file.
  5. Navigate to src > res > values-en.
  6. Open the file strings.xml.
  7. Append the same piece of code to the end of the file:
    <!-- Warranty -->
    	<string name="Warranty">Warranty</string>
    	<string name="WarrantyTerm">WarrantyTerm</string>
    	<string name="WarrantyType">WarrantyType</string>
    	<string name="Warranty1">WarrantyTerm: </string>
    <string name="Warranty2">WarrantyType: </string> 
    Note: You must include the code in values/strings.xml irrespective of whether you have it in any language-specific files. If you have different string in values-en, they override the default values. It is the same as the resource bundle principle.
  8. Navigate to res > layout.
  9. Open the file catalog_product_details.xml. Layout files can be viewed in a graphical editor or in XML format. In the graphical view, you can see the three existing table rows on the page for check availability, find another store and description.

    Three existing rows
  10. Switch to the XML view of the file and locate the code<TableRow android:id="@+id/storeRow", which displays the table row for Store. Add the following code before that line you located:
    <!-- Add a new table row for Warranty -->	
      <TableRow android:id="@+id/warrantyRow"
    	<TextView android:id="@+id/warranty"
    • New table row ID: warrantyRow
    • Text string for the warranty row: String name Warranty is defined in the strings.xml previously. If you want, you can make text changes.
  11. Switch to the graphical editor to see that a new Warranty table row is added to the Product details page, right before the row Find another store.

    Warranty table.
  12. Next, you must add the logic to the tab to display the related product warranty information.
    1. Using the Package Explorer, Navigate to src >
    2. Open This class implements an Android activity that provides the product details that are displayed on the page and defines the page interactions.
    3. Find the displayExtendedProductDetails() method. This method shows extended information of the product or related information. Within the displayExtendedProductDetails() method, add the following code after the // Display store details listener method. This code adds a listener to the new table row you just added to the page layout.
      // Display warranty details
      				TableRow warrantyRow = (TableRow)view.findViewById(;
      				//Register a callback to be invoked when this view is clicked
      				warrantyRow.setOnClickListener(new OnClickListener() {
      				public void onClick(View v) {
      				Product p = products[currentIndex];
    4. Create the method showWarranty at the bottom of the When a shopper clicks the related products button, a new intent is created. The intent specifies the action to take (the activity class) and also stores data that is available to the activity.
      private void showWarranty(Product p){
      		Intent intent = new Intent();
      		//Get user data from Product noun
      		String warrantyTerm = p.getWarrantyTerm();
      		String warrantyType = p.getWarrantyType();
      		intent.putExtra("warrantyTerm", warrantyTerm);
      		intent.putExtra("warrantyType", warrantyType );
      		intent.setClass(getApplicationContext(), WarrantyActivity.class);

      Intent is used to call one activity from another and putExtra are parameters that you want to pass from one to another in name-value pairs. You can pass any values, even objects, as parameters. With warrantyTerm and warrantytype, they can be passed as strings as additional parameters.

    5. Save and close the file. You can ignore the error about the WarrantyActivity class. You will create this class in the next lesson.