Android Developer Fundamentals is a training course created by the Google Android programming concepts and build a variety of apps, starting with Hello. This class enables generating a PDF document from native Android content. You create a new document and then for every page you want to add you start a. Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as.
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Beginning Android® Programming with Android Studio. Published by. John Wiley & Sons, Inc. Crosspoint Boulevard. Indianapolis, IN tisamodiscra.tk Each device manufacturer can customize Android to suite their needs native headers. Distribution tisamodiscra.tk . So, if you've just started your career as an Android developer or planning to learn Android app development, follow these steps. [If you are an.
Take a look at DefaultLinkHandler source to implement custom behavior. Pages fit policy Since version 3. Double tap zooming There are three zoom levels: min default 1 , mid default 1.
On first double tap, view is zoomed to mid level, on second to max level, and on third returns to min level. If you are between mid and max levels, double tapping causes zooming to max and so on. Zoom levels can be changed using following methods: void setMinZoom float zoom ; void setMidZoom float zoom ; void setMaxZoom float zoom ; Possible questions Why resulting apk is so big?
Android Developer Fundamentals (Version 2)
Apk must contain all this libraries to run on every device available on market. Fortunately, Google Play allows us to upload multiple apks, e. There is good article on automatically splitting your application into multiple apks, available here. You only need to do this in your application, no need for forking PdfiumAndroid or so.
Downloading files is long running process which must be aware of Activity lifecycle, must support some configuration, data cleanup and caching, so creating such module will probably end up as new library.
How can I show last opened page after configuration change? You have to store current page number and then set it with pdfView. Use FitPolicy. WIDTH policy or add following snippet when you want to fit desired page in document with different page sizes: Configurator. You can use a combination of the following settings to get scroll and fling behaviour similar to a ViewPager:. See the License for the specific language governing permissions and limitations under the License.
Each file is shown as a code listing with the full filename as the title. This helps to convey where the file lives in an Android project. At the same time, when too many files are shown, it clouds functionality.
Therefore, two coding styles are slightly different than would be expected in a normal application: n n The code has limited comments. The text explains the functionality clearer than inline comments could, and bolded code shows the main lines needed to get the particular technique working. In practice, actual code should have more comments than presented in the recipes. Strings are explicit and do not point to a global resource.
In this book, however, when only a few strings are needed for a recipe, the strings are made explicit rather than including a whole additional file just to define them. People just starting with Android are served well to use Eclipse for the development environment with the Android plugin. As discussed more in Chapter 2, this ensures proper Android project setup and context, and Eclipse even adds a placeholder icon figure.
It also helps with more advanced tasks, such as signing an application for distribution. It leads to faster development and more realistic testing. All code examples in this book have been tested on an actual device running Android 2. Some functionality for example, Bluetooth pairing or sensor changes is difficult and opaque when using the emulator.
Therefore, it is recommended that initial testing be done with an action Android device. Designing Applications Well Three elements are needed for an excellent application: a good idea, good coding, and good design.
Often, the last element is paid the least attention because most developers work alone and are not graphic designers.
Google must realize this because it has created a set of design guidelines: icon design,App Widget design, activity and task design, and menu design. Good design cannot be stressed enough. It sets an application apart, improves user adoption, and builds user appreciation. In fact, a device can be called an Android device only if it passes compatibly tests with the Android APIs. However, if an application makes changes to the underlying system, compatibility is not guaranteed.
To ensure forward compatibility of an application when future Android updates are installed on devices, follow these rules suggested by Google: n n n n n Do not use internal or unsupported APIs.
Do not directly manipulate settings without asking the user. A future release might constrain settings for security reasons. For instance, it used to be possible for an app to turn on GPS or data roaming by itself, but this is no longer allowed.
Example book pages
Do not go overboard with layouts. This is rare, but complicated layouts more than 10 deep or 30 total can cause crashes.
Do not make bad hardware assumptions. Not all Android devices have all possible supported hardware. Be sure to check for the hardware needed, and if it does not exist, handle the exception.
Ensure device orientations do not disrupt the application or result in unpredictable behavior. Screen orientation can be locked, as described in Chapter 2. Note that backward compatibility is not guaranteed with Android.
It is best to declare the minimum SDK version as described in Chapter 2, so the device can load the proper compatibility settings. Utilizing other new features on older targets is also discussed at various places throughout the book. Robustness In the same vein as compatibility support, applications should be designed and tested for robustness.
Following are a few tips to help ensure robustness: n n Use the Android libraries before Java libraries. Android libraries are constructed specifically for embedded devices and cover many of the requirements needed in an application. For the other cases, Java libraries are included. However, for cases where either can be used, the Android library is best.
Take care of memory allocation. Initialize variables. Try to reuse objects rather than reallocate. This speeds up application execution and avoids excessive use of garbage collection. Test thoroughly, including different environments and devices if possible. Installing and Upgrading There are many places on the Internet that discuss detailed step-by-step instructions on how to install the Android SDK.
Therefore, the general procedure outlined here serves to emphasize the most common installation steps for reference.
These steps should be done on a host computer used as the development environment. Install Eclipse Classic for example, version 3.
In the case of Windows, this just needs to be unzipped in place and is ready to use. Install the Android SDK starter package for example, version r Browse to the location where the SDK was unzipped and apply.
Android JUnit tests can be configured here, too.
A main driver in OS improvement is the increased capability of hardware on new devices. Some legacy Android devices cannot support the new version requirements and are not updated with new OS releases. This leads to a user base with a variety of different possible experiences. The developer is left with the task of checking for device capability or at least warning devices of required features.
This can be done through a check of a single number: the API level. Smart virtual soft keyboard, support for third-party keyboards. AppWidget framework. Live Folders.
Raw audio recording and playback. Interactive MIDI playback engine. Video recording APIs. Stereo Bluetooth support. Removed end-user root access unless tethered to computer and using SDK.
Kotlin for Android Developers PDF
Speech recognition via RecognizerIntent cloud service. Donut: Android OS 1. Support for multiple screen sizes. Gesture APIs. Text-to-speech engine.There is good article on automatically splitting your application into multiple apks, available here. Localizing Android Apps Android applications are popular all over the world. Some touch events are available transparently to the developer without the need to implement their detailed behaviors.
Unit 4: Saving user data This unit discusses how to store user data.
Location and Maps Android Developers Note: This is rare, but complicated layouts more than 10 deep or 30 total can cause crashes. For some of these topics you can find information in the general tutorials as well but if you want more detail, this is for you. Test thoroughly, including different environments and devices if possible.
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