Home > Articles > Programming > Java

  • Print
  • + Share This
This chapter is from the book

This chapter is from the book

TableLayout

The TableLayout is used for arranging the enclosed controls into rows and columns. Each new row in the TableLayout is defined through a TableRow object. A row can have zero or more controls, where each control is called a cell. The number of columns in a TableLayout is determined by the maximum number of cells in any row. The width of a column is equal to the widest cell in that column. All elements are aligned in a column; that is, the width of all the controls increases if the width of any control in the column is increased.

Operations Applicable to TableLayout

We can perform several operations on TableLayout columns, including stretching, shrinking, collapsing, and spanning columns.

Stretching Columns

The default width of a column is set equal to the width of the widest column, but we can stretch the column(s) to take up available free space using the android:stretchColumns attribute in the TableLayout. The value assigned to this attribute can be a single column number or a comma-delimited list of column numbers. The specified columns are stretched to take up any available space on the row.

Examples:

  • android:stretchColumns="1"—The second column (because the column numbers are zero-based) is stretched to take up any available space in the row.
  • android:stretchColumns="0,1"—Both the first and second columns are stretched to take up the available space in the row.
  • android:stretchColumns="*"—All columns are stretched to take up the available space.

Shrinking Columns

We can shrink or reduce the width of the column(s) using the android:shrinkColumns attribute in the TableLayout. We can specify either a single column or a comma-delimited list of column numbers for this attribute. The content in the specified columns word-wraps to reduce their width.

Examples:

  • android:shrinkColumns="0"—The first column’s width shrinks or reduces by word-wrapping its content.
  • android:shrinkColumns="*"—The content of all columns is word-wrapped to shrink their widths.

Collapsing Columns

We can make the column(s) collapse or become invisible through the android: collapseColumns attribute in the TableLayout. We can specify one or more comma-delimited columns for this attribute. These columns are part of the table information but are invisible. We can also make column(s) visible and invisible through coding by passing the Boolean values false and true, respectively, to the setColumnCollapsed() method in the TableLayout. For example:

  • android:collapseColumns="0"—The first column appears collapsed; that is, it is part of the table but is invisible. It can be made visible through coding by using the setColumnCollapsed() method.

Spanning Columns

We can make a column span or take up the space of one or more columns by using the android:layout_span attribute. The value assigned to this attribute must be >=1. For example, the following value makes the control take or span up to two columns:

android:layout_span="2"

Let’s try arranging controls in a TableLayout with an example. Create a new Android project called TableLayoutApp. Make its layout file activity_table_layout_app.xml appear as shown in Listing 3.13.

Listing 3.13. The Layout File activity_table_layout_app.xml on Arranging Controls in a TableLayout Container

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:stretchColumns="1">
    <TableRow android:padding="5dip">
        <TextView
            android:layout_height="wrap_content"
            android:text="New Product Form"
            android:typeface="serif"
            android:layout_span="2"
            android:gravity="center_horizontal"
            android:textSize="20dip" />
    </TableRow>
    <TableRow>
        <TextView
            android:layout_height="wrap_content"
            android:text="Product Code:"
            android:layout_column="0"/>
        <EditText
            android:id="@+id/prod_code"
            android:layout_height="wrap_content"
            android:layout_column="1"/>
    </TableRow>
    <TableRow>
        <TextView
            android:layout_height="wrap_content"
            android:text="Product Name:"
            android:layout_column="0"/>
        <EditText
            android:id="@+id/prod_name"
            android:layout_height="wrap_content"
            android:scrollHorizontally="true" />
    </TableRow>
    <TableRow>
        <TextView
            android:layout_height="wrap_content"
            android:text="Product Price:" />
        <EditText
            android:id="@+id/prod_price"
            android:layout_height="wrap_content" />
    </TableRow>
    <TableRow>
        <Button
            android:id="@+id/add_button"
            android:text="Add Product"
            android:layout_height="wrap_content" />
        <Button
            android:id="@+id/cancel_button"
            android:text="Cancel"
            android:layout_height="wrap_content" />
    </TableRow>
</TableLayout>

We cannot specify the layout_width attribute for the controls enclosed within the TableLayout, as their width will be always set to match_parent by default. We can specify the layout_height attribute for the enclosed controls (the default value is wrap_content). The layout_height attribute of the TableRow is always wrap_content.

Cells are added to a row in increasing column order. Column numbers are zero-based. If we don’t specify a column number for any cell, it is considered to be the next available column. If we skip a column number, it is considered an empty cell in that row. We can make a cell span columns. Besides TableRow, we can use any View subclass as a direct child of TableLayout. The View is displayed as a single row that spans all the table columns.

In Listing 3.13, we specify that the second column of each row should be stretched to take up any available space in the row. The row contents are

  • The first row of the table has a single control, New Product Form TextView. The TextView is set to span two columns and is set to appear at the center of the horizontal space. The font of the text displayed through TextView is set to serif, 20dip in size.
  • In the second row, a TextView and an EditText control are displayed. The TextView control with text Product Code is set to appear at the column 0 location (the first column), and the EditText control is set to appear at column 1 (the second column).
  • In the third row, again two controls, TextView and EditText, are displayed. The TextView control with the text Product Name is set to appear in column 0. If the user types text beyond the width of the EditText control, the content scrolls horizontally.
  • In the fourth row, the TextView control with the text Product Price is displayed in the first column, and the EditText control is displayed in the second column.
  • In the fifth row, a Button control with the caption Add Product is displayed in the first column, and a Button control with the caption Cancel is displayed in the second column.

When the application is run, the controls are laid out in rows and columns, as shown in Figure 3.14.

Figure 3.14

Figure 3.14. Different controls arranged in TableLayout

  • + Share This
  • 🔖 Save To Your Account

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020