android application development book

1, first set the phone to debug mode method: Set--application--development--USB debugging, hit √ 2, connect to the computer with a data cable 3, and then open eclipseRight click on the project, select Run as, then select Run ConfigurationsSelect targetSelect Always Promp ti pick devices, click ApplyThen execute the Android appFinally select the real machine to ru

three common image compression methods in Android application development are: Mass compression method, proportional compression method (obtain picture according to path and compress) and proportional compression method (according to bitmap image compression). First, mass compression methodPrivateBitmap compressimage (Bitmap image) {Bytearrayoutputstream BAOs=New

Guo XiaoxingWeibo: Guo Xiaoxing's Sina WeiboEmail:[email protected]Blog: http://blog.csdn.net/allenwellsGithub:https://github.com/allenwells"Android App Development technology: User Interface" chapter list one px, DP, SP PX: pixels, each px corresponds to a point on the screen. DP: A device-independent pixel, an abstract unit based on screen density, on a display of 160 dots per inch: 1 DP = 1 px.

1. ADT plug-inHttps://dl-ssl.google.com/android/eclipse/This plug-in is actually a high-level Android Application Development ide. The necessity is conceivable.2. egit plug-inHttp://download.eclipse.org/egit/updates-1.0Because my current project is developed by many people, the code needs to be centrally managed, and t

In the process of Android development, there are a lot of things are often used, in order to improve efficiency, the usual methods to make a record.1. In network programming, if you have not established a socket to use send write, there will be an exception, the package is no problem (if you send byte[] type to change the parameter type):public static Boolean sendmsg (OutputStream outs,string str) {Boolean

virtual machine adds the weak reference to the reference queue associated with it if the object referenced by the weak reference is garbage collected. The fundamental difference between weak references and soft references is that objects with only weak references have a shorter lifecycle and may be recycled at any time. Objects that only have soft references are recycled only when there is not enough memory, and are usually not recycled when memory is sufficient. Several classes are provided

;@Overrideprotected void OnCreate (Bundle savedinstancestate) {Setcontentview (R.layout.activity_result);Initviews ();//Initialize control, omitGetserverdata ();//Get Server service corresponding data｝private void Getserverdata () {If successful, such as the sign of success is the Boolean flag=true;if (flag) {Viewstub = (viewstub) Findviewbyid (r.id.stub_pay_result_success);View view = Viewstub.inflate ();Then use Findviewbyid () to find the controls in the view to set the data｝}}This allows the

OnCreate (Bundle savedinstancestate) {//TODO auto-generated method Stubsuper.oncreate (savedinstancestate); Setcontentview (r.layout.result); listview = (ListView) Findviewbyid (R.ID.LISTVIEW01);//Gets the value passed over the last page intent intent = This.getintent (); Bundle B = Intent.getbundleextra ("Data"); List List = new ArrayList (), List.add (b.getstring ("username")), List.add (b.getstring ("password")), List.add ( B.getstring ("Gender")), List.add (b.getstring ("hobby")), List.add

= Bitmapfactory.decodebytearray (data, 0, data.length);117//file path and filename118 File PictureFile = new file (Environment.getexternalstoragedirectory (), "Camera" +integer.tostring (whichpictu RE) + ". jpg");119Try121 {122 FileOutputStream Mfileoutputstream = new FileOutputStream (picturefile);123//Press the image data into the file124 mbitmap.compress (Bitmap.CompressFormat.JPEG, Mfileoutputstream);try {126//Turn off the output stream127 mfileoutputstream.close ();* catch (IOException e)

Eclipse + super-fast simulator Genymotion Android Application Development (step 1: install and configure Genymotion), genymotionandroid 1. install and configure Genymotion (1) because of the SDK simulator provided by Eclipse, it is slow to start. Now we will introduce Genymotion, a fast simulator. (2) First, register an account on Genymotion's official website.

); Spinner = (spinner) Findviewbyid (R.ID.SPINNER2); /* Static display of the menu options, the display of the array elements in advance has been set * The second parameter: already prepared the array * Third data: Default Style * * arrayadapter Code for Main_activity: Because the first is the static implementation method, we need to set the spinner to display beforehand. Add what you want to display in the String.xml file: The second is the static implementati

Android Application Development-Xiao Wu CSDN blog client Jsoup, androidjsoupAndroid Application Development-Xiao Wu CSDN blog client JsoupTwo weeks have passed since the previous blog, and Xiao Wu was very sorry, because he was busy working on another project and almost coul

Otto is a Eventbus type of event transport bus that provides "store-and-forward" functionality, making it easier to communicate the various components of your app, and to make your programs more layered. Working with scenesOtto is based on the observer design pattern. It has publishers, subscribers to these two main objects. The best practice of Otto is to sacrifice the small performance by reflection, and greatly improve the coupling degree of the program, which is more advantageous to the

Outputs a null array without a name-proficient in android and IOS App application service development and androidios Direct output [] The example file _ samples/app/array_null.json is in the _ samples/app/directory of the Light-open platform. It's too Easy to write more content. Please try it on your own !!! Download related resources:Mobile App server

Output a record in the Bag-proficient in android, IOS App application service development, and bagandroid Closed json format content {“item”: { Organize a complete json format text output to the App together with the running result of the inner tag Initialize records in the Bag (you can also query records from the database) Output one of them The value attr

Chapter III Getting Started with GitThe purpose of using GIT is to reduce the compression size of various versions of Linux and provide source code to compile on Linux.In this chapter, the key step is actually the operation, although Git is not very much associated with the android we are learning, but it is also essential in the development environment. Learn this chapter by learning how to install, view,

Com.ferris.view;import Android.content.context;import Android.support.v4.view.viewpager;import Android.util.attributeset;import Android.view.view;public class Myviewpage extends Viewpager {public MyViewPage ( Context context) {super (context);//TODO auto-generated Constructor Stub}public myviewpage (context context, AttributeSet attrs) {Super (context, attrs);//TODO auto-generated constructor stub} @Overrideprotected Boolean CanScroll (View V, boolean checkv, int dx, int x, int y) {if (v! = T

position in this layout toastview.addview (imageview,0); Toast.show (); 4. Fully customizable display mode Java code Inflater means inflatable //layoutinflater. This class is used to instantiate the layout of an XML file to its corresponding view object LayoutInflaterinflater= Getlayoutinflater (); //fills a View object by developing an XML file and layout ID viewlayout=inflater.inflate (R.layout.custom2 , (ViewGroup) Findviewbyid (r.id.lltoast)); ImageViewimage= (ImageView) Layout.find

In Android Application Development, we do not want users to directly press the Back key to exit the Activity, but hide the application to the background, similar to pressing the Home Key. The following provides sample code. For more information, see. 1 public boolean onKeyDown (int keyCode, KeyEvent event) {2 if (key

characteristic values for the 1800 and 1801 services of GATT are as follows:08-28 09:05:48.492:d/bluetoothgatt (4251): Ongetcharacteristic ()-Device=08:7c:be:21:d1:24 UUID= 00002a00-0000-1000-8000-00805f9b34fb08-28 09:05:48.494:d/bluetoothgatt (4251): Ongetcharacteristic ()-Device=08:7c:be:21:d1:24 UUID= 00002a01-0000-1000-8000-00805f9b34fb08-28 09:05:48.495:d/bluetoothgatt (4251): Ongetcharacteristic ()-Device=08:7c:be:21:d1:24 UUID= 00002a02-0000-1000-8000-00805f9b34fb08-28 09:05:48.495:d/blu