Android

One, PreferencesPreferences is a lightweight method of storing data, using the following methods:Save values in a:Sharedpreferences.editor sharedata = getsharedpreferences ("Data", 0). Edit ();Sharedata.putstring ("name",

In the development of Android applications, sometimes to save the user's information, in the entire application can be accessed, of course, with the Android-supported SQLite database is OK, but if only to store some of the comparative advice or a

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

To manage fragment, you need to use Fragmentmanager, and to get it, you call Method Getfragmentmanager () in the activity. You can use Fragmentmanager to do these things: 1 Use the method Findfragmentbyid () or Findfragmentbytag () to obtain the

In the development of Android applications, transaction processing is very important when using a database.         first Android database operations (especially write operations) are very slow, and packing all operations into one transaction can

Under the Android platform, when multithreaded programming, it is often necessary to do some processing in a separate thread outside the main threads, and then update the user interface display. However, the problem with directly updating the page

 Java has a very useful tool class, you can less than a lot of if else to judge, but not many people use, published this article is intended to let many people use this tool class, improve code quality and force lattice Math.PI returns the

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

The hole the Android developer encountered as an iOS developer, suddenly let me touch the Android development content, in fact, my heart is very reluctant. Why I'm learning about Android is not that I'm not doing iOS development, or that I'm not in

The Java Native Interface (JNI) standard is part of the Java platform that allows Java code to interact with code written in other languages. JNI is a local programming interface that enables Java code that runs inside a Java Virtual machine (VM) to

Private Configuration config; Private displaymetrics DM; private resources; resources = getresources ()//Get Res resource object config = resources.getconfiguration (),//Get Set object DM = Resources.getdisplaymetrics (); Button.setonclicklistener

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

Today, Jinshan WPS to the school to open a lecture, holding a try attitude to participate in the lecture written, reported the server engineer position, but the written position does not have this position, because this semester opened the Android

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

comparison of Asynctask and handler 1 The principle of asynctask implementation, and the applicable advantages and disadvantages Asynctask, a lightweight asynchronous class provided by Android, can directly inherit Asynctask, implement asynchronous

Toast is the most commonly used but now many of the procedures in the market do not notice a point, is the toast immediate shutdown problem Toast played a role in prompting the cancellation should be canceled as soon as possible User cannot manually

one: In the source code development mode 1: Include header file: #include 2: Define macro Log_tag #define LOG_TAG "My LOG TAG" 3: Link log corresponding. So library Add the following statement to the Android.mk

The four components of Andong are designed to solve the problem of cross process communication 1. Radio 2.contentProvide 3.Service inside the commonly used aidl===== is actually binder mechanism 4.Activity such as Call system call application (need

1. Database SQLite operation Import Android.database.Cursor; Import Android.database.sqlite.SQLiteCursorDriver; Import Android.database.sqlite.SQLiteDatabase; Import Android.database.sqlite.SQLiteQuery; Import

An Apache package is provided in Android. It must be noted that the encoding format must be consistent before data can be correctly obtained.Java code Public static msgmodel dopost (string URL, map data) Throws clientprotocolexception,