Android - CommonsWare

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Example: EU4You Handling Multiple Screen Sizes To examine how to use some of these techniques, let us look at the ScreenSizes/EU4You sample application. This application has one activity (EU4You) that contains a ListView with the roster of European Union members and their respective flags. Clicking on one of the countries brings up the mobile Wikipedia page for that country. In the source code to this book, you will find four versions of this application, as we start with an application that is ignorant of screen size and slowly add in more screen-related features. The First Cut First, here is our <strong>Android</strong>Manifest.xml file, which looks distinctly like one shown earlier in this chapter: You will note we have the element, saying that we indeed do support all screen sizes. This blocks most of the automatic 455 Subscribe to updates at http://commonsware.com Special Creative Commons BY-SA 3.0 License Edition
Handling Multiple Screen Sizes scaling that <strong>Android</strong> would do if we said we did not support certain screen sizes. Our main layout is size-independent, as it is just a full-screen ListView: Our row, though, will eventually need some tweaking: For example, right now, our font size is set to be 20px, which will not vary by screen size or density. Our EU4You activity is a bit verbose, mostly because there are a lot of EU members, and we have to have the smarts to display the flag and the text in the row: package com.commonsware.android.eu4you; import android.app.ListActivity; import android.content.Intent; 456 Subscribe to updates at http://commonsware.com Special Creative Commons BY-SA 3.0 License Edition
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The Busy Coder's Guide to Android D
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The Busy Coder's Guide to Android D
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GPS................................
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Using Selection Widgets............
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Embedding the WebKit Browser.......
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Styled Text........................
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query()............................
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You Make the Call!.................
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Handling API Changes...............
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your operating system does not supp
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The book does not cover in any deta
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• Places where you think we could
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Subscribe to updates at http://comm
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The Big Picture • Keyboards, if t
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Content Providers The Big Picture C
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Projects and Targets To test your a
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Projects and Targets • libs/, whi
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Projects and Targets You also indic
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Projects and Targets In the preced
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Projects and Targets ... At the
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Projects and Targets You can create
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Projects and Targets • Only ask f
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Creating a Skeleton Application For
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Creating a Skeleton Application The
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Creating a Skeleton Application Fig
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Using XML-Based Layouts Android's S
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Using XML-Based Layouts Since this
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} public void onClick(View view) {
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Employing Basic Widgets • android
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Employing Basic Widgets Each widget
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Employing Basic Widgets For this pr
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Employing Basic Widgets The corresp
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Turn the Radio Up Employing Basic W
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It's Quite a View Employing Basic W
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Thinking Linearly Working with Cont
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Working with Containers • Set all
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Example Working with Containers Let
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} } } Working with Containers case
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Working with Containers If we toggl
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Working with Containers Positions R
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Working with Containers android:lay
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Working with Containers first in th
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Putting Cells in Rows Working with
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Working with Containers You can als
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Working with Containers
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Working with Containers the remaini
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Using Selection Widgets listbox. Th
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Using Selection Widgets android:lay
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Using Selection Widgets Then, rathe
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Using Selection Widgets the setDrop
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Using Selection Widgets Figure 24.
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Using Selection Widgets For example
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Using Selection Widgets TextView, w
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Using Selection Widgets something n
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Using Selection Widgets Figure 28.
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Using Selection Widgets • android
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Getting Fancy With Lists For exampl
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Getting Fancy With Lists A Dynamic
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Getting Fancy With Lists In the sam
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And you want happy users, right? Ge
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Using the Holder Pattern Getting Fa
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Getting Fancy With Lists super.onCr
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} Getting Fancy With Lists public v
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Getting Fancy With Lists So, let's
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Getting Fancy With Lists 1. While w
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Getting Fancy With Lists Figure 33.
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Getting Fancy With Lists So if we w
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Getting Fancy With Lists layout.set
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Getting Fancy With Lists public Rat
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Getting Fancy With Lists Details of
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Employing Fancy Widgets and Contain
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The Input Method Framework Of cours
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The Input Method Framework H
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The Input Method Framework Numbers
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The Input Method Framework android:
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The Input Method Framework Figure 5
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Applying Menus will appear, showing
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Applying Menus appropriate behavior
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Applying Menus @Override public voi
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Applying Menus Figure 56. The MenuD
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Applying Menus Figure 59. The same
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Applying Menus • You must
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Applying Menus In the layout XML sh
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Fonts 178 Subscribe
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The results? Fonts Figure 61. The F
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Fonts And, of course, Android's int
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android:layout_width="fill_parent"
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Embedding the WebKit Browser on the
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Embedding the WebKit Browser • go
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Running this activity gives us: Emb
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Showing Pop-Up Messages from the cu
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Showing Pop-Up Messages android:lay
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Showing Pop-Up Messages Figure 66.
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Dealing with Threads - merely creat
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Dealing with Threads super.onCreate
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Runnables Dealing with Threads If y
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Dealing with Threads AsyncTask, Gen
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import android.widget.ArrayAdapter;
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Dealing with Threads Since we elect
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Dealing with Threads Figure 68. The
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Handling Activity Lifecycle Events
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onPause() and onResume() Handling A
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What's Your Intent? Creating Intent
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Creating Intent Filters Basically,
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Narrow Receivers Creating Intent Fi
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Launching Activities and Sub-Activi
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} }); } } Launching Activities and
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Handling Rotation control over the
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Uri contact=null; Handling Rotation
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Handling Rotation Figure 74. The Ro
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Handling Rotation viewButton.setOnC
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Handling Rotation android:versionNa
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Handling Rotation To block Android
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Handling Rotation Note that Android
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Working with Resources • Strings,
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Working with Resources ((TextView)f
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@Override public void onCreate(Bund
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Got the Picture? Working with Resou
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Working with Resources Figure 79. T
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Working with Resources public void
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10px 1in Working with Resources In
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Working with Resources Different St
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Working with Resources • There ca
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Working with Resources 2. Next, And
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Using Preferences 3. getDefaultShar
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Using Preferences allowing users to
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Using Preferences Figure 81. The Si
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Using Preferences The fields for
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Using Preferences Any children of P
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Using Preferences Figure 85. The ch
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Philadelphia Pittsburgh Allentown/B
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Using Preferences Figure 88. Editin
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Managing and Accessing Local Databa
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Accessing Files application package
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} } Accessing Files .makeText(this,
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android:text="Close" /> Accessing
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Accessing Files openFileInput() to
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Leveraging Java Libraries • Size:
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android:layout_height="wrap_content
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Leveraging Java Libraries Figure 96
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Reviewing the Script Leveraging Jav
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Communicating via the Internet styl
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Communicating via the Internet We h
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Communicating via the Internet for
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Pieces of Me Using a Content Provid
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Using a Content Provider This metho
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Using a Content Provider • The pr
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Using a Content Provider To delete
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First, Some Dissection Building a C
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onCreate() Building a Content Provi
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Building a Content Provider } else
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Building a Content Provider WHERE c
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getType() Building a Content Provid
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Building a Content Provider
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Mother, May I? Requesting and Requi
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Requesting and Requiring Permission
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Requesting and Requiring Permission
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Service with Class Creating a Servi
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Creating a Service immune to garbag
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Creating a Service For example, the
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Creating a Service @Override protec
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The Ties That Bind Invoking a Servi
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Invoking a Service private void upd
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Alerting Users Via Notifications In
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import android.app.Activity; import
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Alerting Users Via Notifications 4.
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Accessing Location-Based Services L
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Accessing Location-Based Services
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Accessing Location-Based Services
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Mapping with MapView and MapActivit
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android:paddingBottom..............
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