Android

Android technology 8: SQLite data upgrades and androidsqlite data Due to the upgrade of applications, database upgrades are often accompanied by the addition and deletion of Database Upgrade Design tables, addition and deletion of table fields, data

NSArray stores object sorting and NSArray object sorting.NSArray stores the sorting of objects by Wu xueying NSSortDescriptor * sortDescriptor1 = [NSSortDescriptor attributes: @ "distanceValue" ascending: YES]; NSArray * tempArray = [goodsInfoArray

Android comes with Bitmap out Memory processing, which is more convenient for third-party open-source users. It is good to practice it on your own. androidbitmap /*** @ Author intbird@163.com * @ time 20140606 */package com. intbird. utils; import

Android supports multiple file download classes String directoryName = Environment. getExternalStorageDirectory (). toString () + "/filename"; // file storage path // input parameter: Context object, file storage path; DownloadTask downloadTask =

Android shape usageAndroid shape usage Shape is used to set the shape. It can be used in selector, layout, and so on. There are 6 sub-labels. Each attribute is as follows:

Android-based traffic statistics and android-based traffic statistics // --------------------- Traffic statistics -------------------------------- try {PackageManager pm = getPackageManager (); ApplicationInfo ai = pm. getApplicationInfo ("com.

Android Animation, androidanimation The Activity switching Animation is actually the Tween Animation effect in the View Animation (View Animation) of Android. The Tween Animation has four types of Animation effects: alpha (Transparent Change)

Example of SharedPreferences storage obtaining information, sharedpreferences SharedPreferences is easy to use and can easily store and read data. SharedPreferences can only store simple types of data, such as String and int. Generally, the data of

Day 1, androidday Day 1, getting started with Piggy's Android Android background and development environment construction ------ Reprinted with the source: coder-pig This section introduces: With the development of social economy, mobile internet

Different Layout and listviewlayout are loaded for different items in ListView. When rewriting the BaseAdapter of ListView, we often reuse convertView in the getView () method to optimize ListView to improve performance. ConvertView can be recycled

Android 2D graphics (circle, straight line, point) tool class (continuous update) public class Circle {private PointF centerPoint;private float radius;public PointF getCenterPoint() {return centerPoint;}public void setCenterPoint(PointF

Android Network image viewing example 1. layout File 2. Implementation in the main program Package com. wzw. netphoto; import java. io. inputStream; import java.net. httpURLConnection; import

Android research-response to game development and processing buttons 1. onKeyDown Method The onKeyDown method is an abstract method in the KeyEvent. Callback interface. to override the onKeyDown method, you can listen to the event where the button

Android saves user name and password settings and other application information Optimization1. The traditional user name and password mode are SharedPreferences 12 Editor editor = shareReference. edit (); editor. putString (KEY_NAME, "username_value"

Android interface callback mechanism When using the interface callback, I found a common error, that is, the implementation in the callback function may be done using multithreading or asynchronous tasks, this will cause us to expect the callback of

ActionBar of AndroidUI Components I haven't written a blog post for a while. If I find that my blog is not complete, I will use the AndroidUI component. I will update it as soon as possible. Well, let's not talk about it. Let's take a look at

When IOS uses APNS to push Payload in bytes, the push fails. In the past two days, you need to add a script to the push. You can add a script to the badge method. However, the push fails. I have been depressed for a long time and search for relevant

How to upgrade the android Database Add the upgrade operation to the base class table: Public abstract class DbBaseTable {private static final String TAG = "DbBaseTable";/*** @ return the DB table name */abstract String getName (); /*** Creates the

Android ORMapping LibraryI used Java annotations to implement the Android SQLite ORM library. I have written XML before. However, I feel that it is not very stable and the efficiency and robustness are not good in all aspects, it took me one

In Android, the content provider ContentProvider allows you to add, delete, modify, and query databases. 1. First, we will integrate ContentProvider with a new class and implement it as follows: Package com. wzw. sqllitedemo. providers; import com.