Android

  Three methods   1. Use an XML file to define res/drawable/radio. xml   Android: state_checked = "false" Android: drawable = "@ drawable/tabswitcher_long"/> Android: state_checked = "true" Android: drawable = "@ drawable/tabswitcher_short"/>

  It is easy to use XML files, but sometimes it must be implemented dynamically using java code. This is complicated. This requires inheriting RadioButton and overwriting the onDraw method.   The image in the Code is a Bitmap object.   @

In the previous article, we talked about the UI and the stage. Now we can easily build a project. Because the actor class is drawn based on the x and y values, we can change the actor position by controlling the x and y values. However, other actor

  Starting from today, we will step by step implement what we want to achieve in demand analysis. First, we will achieve dynamic display of the date and time at the top of the curriculum.     The date is automatically updated every day, and the

    Two risks should be taken into consideration before camera photography can be used. [1] Not every android machine can use your application Main reasons: The camera takes pictures. The app calls the android system API, the system API, and the

  Some time ago, we engaged in android animation. After using the animation on the page, the effect was quite good, which greatly improved the user experience. However, by chance, to add a display and disappear animation in the popupwindow, I used

  In android development, many of my friends may determine the network type of the mobile phone, because the current android mobile phone may be in a 4-digit status. 1. No network (this status may be due to the shutdown of the mobile phone, the

  1. SimpleDateFormat formatter = new SimpleDateFormat ("MM dd, yyyy HH: mm: ss "); 2. Date curDate = new Date (System. currentTimeMillis (); // obtain the current time 3. String str = formatter. format (curDate ); 4. import java. text.

  Use the android. hardware. Camera class to take photos. The procedure is as follows:   A. Get the Camera instance object,   Camera camera = Camera. open ();   Alternatively, Camera camera = Camera. open (int cameraId );   CameraId indicates the

  Matrix (1) in the previous Android plot, I talked about the principle and Calculation Method of Matrix, which is difficult to understand when it comes to advanced mathematics. Fortunately, Android provides a series of Matrix

  The gravity sensor can be used to obtain the interaction experience between the user and the mobile phone. However, the gravity sensor provides a wide range of data. How can we obtain data that is different from the user's existing operation

  If you want to understand a technology, master a technology, or become a master or expert, learning is an inevitable way. In my opinion, there are two factors that determine the learning efficiency and Achievements: one is the learning method and

  This section describes parameter transfer between activities. We know that intent can achieve mutual jump between activities. We also need to pass some parameters while redirecting. The following describes how to pass parameters in an activity,

    Daming will write some high-quality blogs in the future, which should be as thorough as possible, and be able to read from different perspectives. When there are many problems, the technology is actually a window, when you have a lot of windows,

  When developing android applications, it is easy to scroll horizontally or to make a marquee. The attributes of textview are supported. As long as the settings are accurate, textview will scroll, making development easier, however, textview does

  Nowadays, Android is very popular. Many people compile Android programs in linux, but there are not many people who know how to develop Android applications in Eclipse. I will explain how to compile Android applications in Eclipse 1. First,

    1. as follows:   The first part is to put an image named icon.png in the drawablefolder. First, it indicates that Android only supports images with the extension png, jpg, and gif;   Then write the main. xml file with the following

  Preface   Many people think that there should be no memory leakage due to the garbage collection mechanism of JAVA programs.   In fact, if we no longer use an object in a program, but because there are still references pointing to it, the garbage

Introduction Toast is a pop-up Message that allows you to easily notify users of some time, such as saving data to the SD card. It is worth noting that you cannot cancel Toast. In most cases, Toast is just a short message, but you can also customize

In this section, let's take a look at configuration changes (such as screen orientation, language switching, or input device changes! As we can see from the official documentation, when the configuration changes, any content displayed on the user