Android

How to make drawable revolve around the center. Animation a = new Rotateanimation (0.0f, 360.0f, animation.relative_to_self, 0.5f, animation.relative_to_self,0.5f ); A.setrepeatcount ( -1); A.setduration (1000); How to control the color of

A sample code for Bluetooth chat is given in androidsdk sample, and this article is only slightly modified into a simple server and client-mode application to accommodate one-to-one data transfer in game development. Because the Bluetooth settings

Exception 1, Android.database.cursorindexoutofboundsexception:index-1 requested, with a size of 1 Workaround 1: This exception is the call to Db.que Ry method returns the cursor subscript is-1, in order to obtain the value must be moved down one

because I saw an ORM framework using Greendao in open source projects. Today I finally figured out how to automatically generate Java files such as Entity,dao. preparation: Need to download jar package at Greendao website, address: http ://greendao-

The use of Greendao has been a long time, unknowingly has been updated to the 3.x version. Note The basic methods used: 1. First in the app directory under the main folder under the new Java-gen directory: Note: A Java file will be specified in

first, what is Rxjava 1.1 Introduction A library that uses observable sequences on a Java JVM to compose asynchronous, event-based programs.The concept is very complex, not so-called. Let's learn to use it first. Rxjava GitHub

In the Android development process, file uploads are very common. But the file's breakpoint continues to be rare. Because Android is requesting the server through the HTTP protocol, HTTP itself does not support file breakpoint uploads. However, the

1.Java FoundationMany friends began to learn Android when they started, and seemed too worried. Android application development is based on the Java language, so there is no solid Java basics, but the mechanical copying of other people's Code, it

Android Read and write preference: Package df.util.android; Import android.app.Activity; Import android.content.SharedPreferences; Import Android.preference.PreferenceManager; Import Android.util.Log; /** * Created by the IntelliJ idea. * User:

Normally, this error occurs when Chinese appears in the Java Project code or compile through, but when the run of Chinese garbled. This time only need to add the following sentence in the Build.gradle can be solved Tasks.withtype (javacompile) {

Screen System dropdown status bar @Override protected void onCreate (Bundle savedinstancestate) { super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); Screen system Drop-down status bar

This article introduces the use of HTTP GET and Post methods for network communication, which describes using httpclient httpget and network communication.First, make sure that the current project already contains Apache support librariesDownload

There's a lot of interprocess communication in our Android development, and Android offers a solution that's aidl, so let me explain how to implement Aidl in Android Studio. 1. Create a project in Android studio 2, create two module such as mine:

To do a sliding on the right side similar to the Address book, Look at the interface. Here's a look at the implementation code: Friend.xml Friend_header.xml ;/framelayout> Here the main components are built, sliding function has

In design mode, the simplest is the single case mode. Let's take a look at the single case mode Original: http://www.iteye.com/topic/575052 The singleton pattern can be simple, and all it takes is one class to complete (see this chapter's poor UML

As mentioned earlier, the Android system continues the single-threaded design model of Java, so it often opens up new threads to handle tasks unrelated to UI operations during the development process. The thread is the smallest unit of the operating

Date curdate = new Date (); String datestr = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss SSS", Locale.china). Format (curdate); Various dates in Java represent the following letters: An alphabetic date or time element represents an example

String str = "Hello"; Canvas.drawtext (str, x, y, paint); 1. Rough calculation of text width log.d (TAG, "measuretext=" + paint.measuretext (str)); 2. To compute the rectangle in which the text is located, you can get a width-high Rect Rect = new

How to get a control of the long and high, I believe many friends first saw this problem will feel very simple, directly inside the OnCreate call getwidth, getmeasuredwidth can not be obtained, but, in fact, there is no simple, not letter, You can

Settag ()/gettag () Settag (Onbect) In view adds an extra set of data to the view, which can be taken out later with Gettag (). You can use multiple button to add a listener, each button setting a different Settag. The listener is gettag to tell