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Android data cache-file storage, android file storage
During Android APP development, we usually add cache modules. Cache stores some APP data locally. Most of the data requested by the network is stored locally, so that the cached data can be directly used within the cache
(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//sdcard is mounted
Cachefile = new File (Shoppicinsdcard + fileName);
if(GetImage) {
if(!cachefile.exists () cachefile.createnewfile ()) {//cache file does not exist created the file, download cache image to SDcard
InputStream
1. Download the Android source code
Android source code can be downloaded from 4.0 using SDK Manager. Open SDK Manager and you can see that 4.4 has been used as an example:
But it always prompts that the download fails and the connection times out. It is estimated that https is a ghost.
VcD4KPHA + pgltzybzcm9 "ht
In Android, for multi-threaded operation is very ordinary, so the more understanding of multithreading, then for their own program can be very good runThis is also an important point of knowledge for Android development, so let's now look at how multi-threaded download works.Android Multi-Threaded downloadMulti-Threaded Downl
Solution to Android SDK download and update failure
When you use sdk manager to update the sdk, you may find the following error message during the update process:
Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xmlFetched Add-ons List successfullyFetching URL: https://dl-ssl.google.com/android/repo
The first step,After the SDK manager starts, some Google XML files are parsed and some log messages are printed in log.After parsing, copy all the logs into a notepad (this step is because the Log window does not support the search), in the inside to find what you want to download, and then you can get the corresponding XML file.As an example:If you want to download the arm EABI v7a system image for
skipped, you need to change "repo" in the above command to "../bin/repo" so that the terminal can recognize the repo command.6. the user name and email address are required. You can enter them randomly. If you want to submit a bug to google in the future, you need to enter a valid google account. If "repo initialized in/home/taskiller/android" is displayed, the initialization is complete and the source code can be downloaded.7. In the source director
]:~/android$ export path= $PATH: ~/working_directory/out/host/linux-x86/bin[Email protected]:~/android$ export android_product_out=~/working_directory/out/target/product/genericPs:Working_directory is my source code save folder, its full path is:/home/android/working_directory, Perhaps everyone's path is different from this. However, it is best to add these two l
Common Intent usage in Android-Part 1 (source code download)
Send SMS
When sending a text message, the action we want to use isIntent.ACTION_SENDTOAnd the URI issmsto:Protocol to ensure that the SMS application receives and processes our intent objects, rather than other applications, so as to accurately send SMS messages. If our action is notIntent.ACTION_SENDTO,Intent.ACTION_SENDAnd is not specifiedsmsto
cows, the optional operation is seven cattle callback Business Server, (that is, seven cattle to send file information related to the POST request to the upload strategy within the specified callback address);
5. Business Server reply to seven cattle callback request, give JSON format reply content (must be JSON format reply), this reply content will be seven cow forward to client;
OK, seven Neu Yun operation principle to make clear, careful unders
information provided on the server, so the light web version is not enough, so the birth of this strange app.Good app put on the server, originally figure easy, apk files compressed into Zip package, to customers download, results ... No language is, a lot of customers have no decompression software on the phone, but also do not download and install the decompression software, there is no way, have to put
are several simulated environments, you can search for it on the Internet. Here we use cygwin to build it. This is very simple.
1. Install cygwin
Download cygwin and go to the next step (Note: if you install cygwin for the first time, select install from Internet
Then, select the installation location, the location of the temporary file, and the settings for connecting to the network. the key step is to se
/************************************************************************* * i.mx6 Android 5.1.1 Download, compile * Note: * Here to mention is the 4.2 version, the compilation is interrupted, you continue to make up as if it is OK, but this * 5.1.1 version seems to have to start again, this is a bit depressing. * 2016-9-9 Shenzhen Nanshan Ping Shan village Zengjianfeng *************************************
Android Client Download steps
The Android client first creates an empty file (blank file) that is exactly the same size as the server.
Open several threads to download the corresponding resources on the server respect
As mentioned earlier, Android porting is primarily a Linux kernel migration, and Linux kernel porting is primarily a Linux-powered migration, so in order to develop and test Linux drivers, it is necessary to learn in Ubuntu How to build two sets of development environments under Linux: Android Application development environment and Linux kernel development environment. The construction of the Linux kernel
to the user in the log last method: http://blog.csdn.net/sakulafly/article/details/8466702
Differences between Mac OS X and android
Mac OS x is a private system for Apple Computers. android is a private system for mobile phones and tablets. It is a wide range of open-source software.I downloaded a Mac OS x snow leopard dmg file just now. How can I install it in
problems.
6. Install repo
Copy codeThe Code is as follows: cd
Mkdir bin
Curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo> ~ /Bin/repo
Chmod a + x ~ /Bin/repo
Alias repo = "~ /Bin/repo"
If we need to run the repo at any time, we 'd better configure the repo in the environment:Copy codeThe Code is as follows: vim ~ /. Bashrc# After opening the file, add alias repo = "~ /Bin/repo ", save and exitSource ~ /. Bashrc
In this user environment, y
Android comes with the download manager, we can get to download the progress of the size and download completed and so on, but the Android Downloadmanager is not implemented such as pause, continue to wait for the function is not a breakpoint continuation, these days in the
How to download android studio on the official website and androidstudio on the official websiteHow to download android studio from the official website
My notebook cannot go over the wall. A few days ago, due to the incomplete download of the
Android Studio download and installation tutorial, androidstudio
Recently, Google launched a new development tool android studio at the Google I/O conference. This is a development tool based on intellij IDE. It is built using Gradle. I believe that students who have done java know this tool. Today, I installed it to try it out. I opened it and saw that it was th
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