Android (1) _ introduction and development environment construction

What is 3G
3rd Generation.

3G is a new generation mobile communication system that combines wireless communication with multimedia communication such as the Internet.

3G is only a communication technology standard, in line with this standard technology has WCDMA, CDMA, TD-SCDMA three standard.

China Unicom uses WCDMA (this standard is used for most of the world's 3G networks );
China Telecom uses CDMA (Japanese, Korean, and North American );
China Mobile uses TD-SCDMA with proprietary intellectual property rights (only China ).
3G networks can process images, music, videos, and other media formats compared with the first-generation analog-standard mobile phones (1G) and the second-generation GSM, CDMA and other digital mobile phones (2G, it provides Webpage Browsing, teleconference, e-commerce, and other information services. The main difference between the third generation and the previous two generations is that the speed of sound and data transmission has greatly improved.

As the commercialization of 3G requires a great deal of engineering, it is impossible to connect from 2g to 3G. Therefore, in the past few years, 2G mobile phones emerged. Technologies that comply with the 2.5g standard include cdma 2000 1X and GPRS. China Unicom uses the CDMA 2000 1X standard and China Mobile uses the GPRS standard. Currently, we can regard the 2G mobile communication technology as the link between 2G and 3G. In the 2G network, technologies such as WAP and Bluetooth have emerged.

 

What is android?
Android refers to "Robots". Android is the name of the open-source mobile phone operating system based on the Linux platform announced in November 5, the platform consists of the operating system, middleware, user interface, and application software.

In China, Lenovo, Dell, Voda, Philips, ZTE, Samsung, Motorola, and other manufacturers have launched Android-based smartphones.

In the 3G application development field, the development prospects of Android are not negligible, but will also become the mainstream mobile phone operating systems in the future.

 

 

How to install Android SDK and Eclipse plug-in
Required development environment:
JDK 5 or JDK 6 (only JRE is adequate)
Eclipse 3.5 (galileo)
Install the Eclipse plug-in (ADT)
Start Eclipse, select Help> Install New Software, click Add in the displayed dialog box, enter "ADT" in the name column of the dialog box, and then click Archive ..., browse and select the compressed files of the downloaded ADT plug-in.
Click OK .. Return to the view of available software. You will see this plug-in. Then, select Developer Tools ("Android Developer Tools" and "Android Editors"), click Next, and restart Eclipse.
After downloading sdk, decompress the. ZIP file to a proper location on your computer. Start Eclipse, select window-> preferences, click android on the left side of the open view, and select the Location of the Android SDK In the SDK Location on the right.