The industry stewards have countered Apple's move with their own application stores, so there's a huge opportunity to write the "killer app" for one of several smartphone platforms.
40 MB to less than 4 MB of free RAM
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As a security sandbox, the iPhone OS permits only one third-party application to run at a time, and not in the background.
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Competitors will soon catch up on the UI.
embed navigation and GPS plotting into applications.
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developers can now allow users, from within the application, to purchase and obtain new content
No voice dial.
A client-server mechanism provides access to low-level system resources, and in fact the kernel itself is a server that parcels out resources to those applications that need them. This transaction scheme allows applications to exchange data without requiring direct access to the OS space.
C/C++ for porting existing UNIX applications, and Java to port Java ME MIDlets. As mentioned previously, the software stack offers several run-times that offer application development using WRT widgets, Flash, and Python.
The primary programming language for the platform is Symbian C++,
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don't intermix MIDP 2.0 and BlackBerry API calls that perform either screen drawing or application management.
The catch to writing an application that uses BlackBerry API extensions is that it ties the application this smartphone. However, this is no worse than using the unique Java classes found in Google's Android.
Apple promotes the design goal that applications should accomplish one purpose.
no Flash support, and you can't download files.
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Cocoa Touch is a subset of Apple's Cocoa,
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Quartz engine is identical to the one found in Mac OS X
Only a select few higher-level frameworks have access to the kernel and drivers. If necessary, an application can indirectly access some of these services through C-based interfaces provided in a LibSystem library.
the SDK provides Dashcode, which is a framework based on a Web page composed of HTML and Javascript. You can use DashCode's simulator to write and test your web application. You can also use several other third-party frameworks to write web applications, and debug these with Aptanna Studio's tools.
Made by HTC, the G1 is the first smartphone using the Android platform.
e-mail program (which makes use of Google's Gmail), a mapping program (using the company's Google Maps), and a browser that uses WebKit, not Google's Chrome web browser
Android is not Java ME, nor does it support such applications
ability to both browse and manage multiple IM conversations. On the other hand, such heavy use of the smartphone's CPU shortens battery life significantly. Maybe Apple is on to something in limiting the number of applications that the platform can run.
On the positive side, the Android APIs support a touch interface (and the G1 has a capacitive touch screen), but not any multi-touch gestures.
copying text from the web pages is the browser isn't allowed
The advantage to Android's use of a different bytecode interpreter is that the DVM was designed so that multiple instances of it can run, each in their own protected memory space, and each executing an application. While this approach offers stability and a robust environment for running multiple applications, it does so at the expense of compatibility with Java ME applications.
Seasoned Java programmers will find the Android SDK an amalgam of Java SE and Java ME methods and classes, along with unique new ones
compile the Java code to generate Dalvik bytecode files, with an extension of .dex. These files, along with the manifest, graphics files, and XML files, are packaged into an .apk file that is similar to a Java JAR file.
The certificate that you use to generate the private key does not require a signing authority, and you can use self-signed certificates for this purpose.
The Developer Phone provides access to a shipping Android device without the cash outlay or contract contortions required when developing for the other platforms.
in February the site began supporting priced applications. Google allows developers to take seventy percent of the proceeds.
it's possible that you might pick up a malicious application before it is detected by the user community.
Open source, open platform: if you hate the mail program, some third-party is writing a better one.
Lengthy developer's overview of Symbian, Mac OS X iPhone, Blackberry, Android. This talks about the leading app platforms except Java ME and Windows Mobile, though it does explain how Blackberry and Symbian support Java ME.
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