case, you need to rewrite the Code (for more information, see the section comparing NEON * of ARM * and Intel SSE ).
JNI performance impact and overhead
Java * Native Interface (JNI) combines Android * Java * code with native code pre-compiled by NDK. For more information about this interface, visit: http://java.sun.com/docs/books/jni /.
The above link provides a wide and in-depth analysis of the JNI specification. If you only want to know its overvi
Android learning route (3) run your Android app, route android
If you have created your Android project according to the previous lesson, it contains the default "Hello World" source file, allowing your project to run immediately.
How do you run your application? Two things: Whether you have a real
My Android advanced tour ------> Android implements music oscilloscope, balancer, bass and audio field functions, and android advancedThis example is from the crazy Android handout. To implement specific functions, you need to understand the following APIs:
MediaPlayer Media Player
Visualizer Spectrum
Equalizer
Ba
Android-OpenCV was originally set up in Ubuntu10.10, and the update was made the day before yesterday, and the driver was gone to Ubuntu11.04. Reinstall Ubuntu11.04 and find that the 2.6.38 kernel of Ubuntu11.04 has removed videodev. h. You must change the header to run OpenCV (or keep synchronization with trunk, see AndroidTrunk, click to download ). Or switch back to Ubuntu10.04LTS. Now the kernel is 2.6.32. (
A
Android development will bring about a new wave of popularity. Many developers have invested in this wave and created many excellent applications. Many developers provide open-source applications and contribute their wisdom and creativity. Learning open source code is the best way to master the technology. Several open-source application projects are recommended below. These projects not only provide excellent ideas, but can also be directly mastered.
-down refresh and pull-up loading functions. (Although open-source things are easy to use, it is recommended that you do not need open-source components to implement the desired results by yourself. After all, you need to understand the principles, I try to be concise and enter the topic.
Let's take a look at the final implementation:
Preparations
1. Since the PullToRefresh component is used to implement pull-down refresh and pull-up data loading, We need to download it first.
This is the Pull
[Android development experience] Use Android Studio for unit testing and android unit testing
Reprinted please indicate the source: http://blog.csdn.net/zhaokaiqiang1992
Android Studio has reached version 1.2, and developers in China are basically switching from Eclipse to Andr
Android configuration file (2) and android configuration file
We know that each module of the Android system provides very powerful functions (such as phones, power supplies, and settings). By using these functions, applications can be more powerful and flexible. However, using these functions is not unconditional, but requires some permissions. Next, we will beg
[Android development diary] explores Android Service for the first time! Service Startup + gravity sensing + pop-up window + keep running, exploring androidPreface:
I am writing a small program recently. The demand is that the cell phone will pop up as soon as it is shaken. The first time I used the Service, I learned how to use it for two days. I realized a Service pop-up window, started the Service, start
Now there's an Android project A. We wanted to extend the functionality of a, but didn't want to develop on a basis, so we created another Android project B and wanted to refer to a in B.
One idea is to make engineering a a pure jar bag so that other projects can be referenced directly.
However, if you use a reference in R.java in Project A, you cannot make a jar package. The reason is that R.java are gen
Everyone android is a good mobile phone application software, we use the time to find his home page layout is nine mode, people feel very chic, because now a lot of Android software rarely use this layout mode, everyone Android use is very successful, Make people feel simple and generous and beautiful, let's look at the layout of
Objective
Since most of the Android beginner's tutorial doesn't teach you how to choose time, beginners encounter this kind of inevitable will be a bit overwhelmed, should let the user enter the date time? Not to say that the user experience is not good, processing users to enter a variety of date format will also take a great deal of effort, below to see how to achieve the Android selection time function.
Android Studio is a Google Android development environment, similar to eclipse development and debugging, is a tool development software. Android Studio 1.0 has recently been released. For more information, view the page.
Install using the PPA, very convenient, open the terminal, enter the following command:
sudo add-apt-repository ppa:paolorotolo/
The generated Android application APK file is best optimized because the essence of the APK package is a zip-compressed document that optimizes the orderly arrangement of uncompressed data in the package, reducing the memory consumption at the time the application runs. We can use the Zipalign tool for APK optimization.
Zipalign is an important tool for optimizing APK applications, according to the Android
Free Library and tool set for Android development, android class libraryA set of free class libraries and tools for Android development, which are classified by directory. Action Bars
ActionBarSherlock
Extended ActionBar
FadingActionBar
GlassActionBar
V7 appcompat library
Advertisement
AdMob
Google Mobile Ads SDK
InMobi
MMedia
MobileCore
MoPub
Tapjo
Android Toast introduction-android learning journey (), toast-androidToast Introduction
Toast is a very convenient message prompt box that displays a short message prompt on the desktop. There are two features:1. The message does not obtain the focus.2. It will automatically disappear in a period of time.Toast generation steps
1. Call the constructor or the static method makeText () to generate a Toast.2. C
Before using the API, You need to obtain the Baidu map mobile API Key, which is related to the program name you reference the API. For details, see apply for API KEYhttp: // dev.baidu.com/wiki/static/imap/key/Baidu map API supports Android 1.5 and later systems.
Must appear download API Development Kit: Click to download http://www.bkjia.com/uploadfile/2012/0305/20120305100544520.zip
The extracted file
I haven't been on the blog for a long time. I don't even remember the real user name and password. Back to the truth, a friend recently asked me how to create a QR code for the Android platform. I finally convinced myself to study how to create an Android platform, maybe the method I learned is not comprehensive, and I have taken a lot of detours, but this is a trace of exploration, we hope that we can save
and release the refresh feature. Although it is just one sentence, the process of preparing these files is very painful and long.
What files are contained in the update.zip package? How are these files made? Hohoat: Now, the problem is solved by starting from the beginning. After Uncompressing this update.zip package, we can see two directories and one file:
Boot. IMG
META-INF
System
The best learning method is to unpack the update.zip package on the Internet now, read and analyze the packag
Android notes-Android architecture and android ArchitectureI. Android system architecture
The Android system architecture consists of four layers: Linux kernel layer, system library layer, application framework layer, and application layer.
Figure 1 architecture of the
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