Android - CommonsWare

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Leveraging Java Libraries Third, scripting languages that expose the whole Java API, like Beanshell, can pretty much do anything the underlying Android security model allows. So, if your application has the READ_CONTACTS permission, expect any Beanshell scripts your application runs to have the same permission. Last, but certainly not least, is that language interpreter JARs tend to be...portly. The Beanshell JAR used in this example is 200KB. That is not ridiculous, considering what it does, but it will make applications that use Beanshell that much bigger to download, take up that much more space on the device, etc. ...And Not A Drop To Drink Not all Java code will work on Android and Dalvik. Specifically: • If the Java code assumes it runs on JavaSE, JavaME, or JavaEE, it may be missing some APIs that those platforms provide that Android does not. For example, some charting libraries assume the existence of Swing or AWT drawing primitives, which are generally unavailable on Android. • The Java code might have a dependency on other Java code that, in turn, might have problems running on Android. For example, you might want to use a JAR that relies upon an earlier (or newer) version of the Apache HTTPComponents than the one that is bundled with Android. • The Java code may use language capabilities beyond what the Dalvik engine is capable of using. In all these cases, if you only have a compiled JAR to work with, you may not encounter problems at compile time, but only when running the application. Hence, where possible, it is best to use open source code with Android, so you can build the third-party code alongside your own and find out about difficulties sooner. 329 Subscribe to updates at http://commonsware.com Special Creative Commons BY-SA 3.0 License Edition
Reviewing the Script Leveraging Java Libraries Since this chapter covers scripting in Android, you may be interested to know that you have options beyond embedding Beanshell directly in your project. Some experiments have been conducted with other JVM-based programming languages, such as JRuby and Jython. At present, their support for Android is incomplete, but progress is being made. Beyond that, though, there is the Android Scripting Environment (ASE). ASE, downloadable off the Android Market, allows you to write scripts in Python and Lua, to go along with Beanshell. These scripts are not fullfledged applications and, at the time of this writing, are not really distributable to others. And, ASE is not precisely designed to extend other applications, though it can be used that way. But, if you want to do ondevice programming, ASE is probably the best answer. 330 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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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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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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Rugged Terrain Mapping with MapView
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Handling Telephone Calls Report To
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Handling Telephone Calls The activi
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Development Tools Figure 105. ReadW
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Development Tools Figure 107. Hiera
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Development Tools Figure 109. Hiera
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Development Tools What may not be i
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Logging Development Tools Figure 11
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Development Tools Figure 114. DDMS
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Development Tools Figure 116. DDMS
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Development Tools Figure 118. Simul
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Put It On My Card Development Tools
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Taking the Default Handling Multipl
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Handling Multiple Screen Sizes •
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Handling Multiple Screen Sizes Thes
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Density-Based Sets Handling Multipl
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Handling Multiple Screen Sizes •
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Handling Multiple Screen Sizes size
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Handling Multiple Screen Sizes Repl
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Handling Multiple Screen Sizes scal
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Handling Multiple Screen Sizes R.st
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Handling Multiple Screen Sizes Figu
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Handling Multiple Screen Sizes />
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Handling Multiple Screen Sizes Now
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super.onCreate(savedInstanceState);
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Handling Multiple Screen Sizes In s
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Dealing With Devices Fortunately, s
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Dealing With Devices Market are tes
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Dealing With Devices The CLIQ also
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Not all devices will be this way. H
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The lessons to take from this: Hand
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Handling Platform Changes Note that
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Wrapping the API Handling Platform
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Handling Platform Changes } else {
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} } Handling Platform Changes publi
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You might also consider: Where Do W
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ContentManager.....................
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PreferenceCategory.................
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INTEGER............................
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getSpeed().........................
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setColumnShrinkable()..............
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android:paddingBottom..............
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