Android development of the image store is more time-consuming things, and the use of the third party of the seven Neu Yun, it can be a good solution to these worries, recently I was also learning seven Cow SDK, will use the process in this record down, easy to use later.
First say seven Neu Yun storage principle, above this picture is the official schematic diagram, the expression of course more clear.
A small case of file storage was done today, and this is a way to solidify the unit testing and MVC design patterns in Android.. The ANDROIDMVC mode is as followsStep 1: Layout editing:The layout page and code are as follows:Button Android:id= "@+id/btnsave"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_below= "@+id/etcontent"Android:layout_centerhorizontal= "true"An
This time can and see very uncomfortable sharedpreferences say goodbye. The usage is disgusting. Save the fart big point data also uses commit.The end of the groove, on the codeLocalstorage.javaImport Java.io.file;import Java.io.fileinputstream;import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.ioexception;import Java.io.outputstream;import Java.io.unsupportedencodingexception;import Java.net.urldecoder;import Java.net.urlencoder;import Java.util.hashmap;import J
-intensive algorithms such as: Width*height*config of images. If config is set to argb_8888, then the config above is 4.A 480*320 picture takes up memory that is 480*320*4 byte. The memory footprint of the Android process is 16M by default, because bitmap he holds data in addition to Java, the underlying C + + Skia Graphics library holds a Skbitmap object, so the general picture should not exceed 8M in memory recommended size. This can be adjusted, yo
Contentprovider is a mechanism for data sharing between different applications on the Android platform. This mechanism can be used if an application needs to allow other programs to operate on its own data. In addition, this method ignores the underlying data storage implementation. contentprovider provides a unified method for data operations through Uris. The procedure is as follows:
1. Define a contentpr
The previous section describes how to store files to internal devices. Sometimes, you need to store files to external storage devices, such as SD cards. Because the SD card has a larger storage space and can easily share these files with other users.
Use the example in the previous section to save the text you entered on the SD card and modify the onclick () even
1. The file storage data uses Io operations in Java to store and read files, but Android encapsulates the methods for retrieving input and output streams in the context class.The created storage file is saved in the/data/
2. operation.Save the file content: Get the output stream through context. openfileoutput. The parameters are file names and
Data storage and access
Most of the time, our software needs to store or re-access the processed data.
Android provides multiple data storage methods, including the following:
File
SharedPreferences
SQLite Database
Content provider)
Network
Use Files for data storageFirst, we will introduce how to store data using files. Activity provides the openFileOutput ()
Data storage and accessMost of the time, our software needs to store or re-access the processed data. Android provides multiple data storage methods, including the following:FileSharedPreferencesSQLite DatabaseContent provider)Network
Use Files for data storageFirst, we will introduce how to store data using files. Activity provides the openFileOutput () method t
Android data storage,
When the app is running, you need to save some user information. For example, the logon status and account information. Android provides multiple methods to store user data.
1. key-value storage, implemented through SharedPreferences
SharedPreferences sp = getSharedPreferences ("test", Context.
In android, Parcel is used to bind containers that store basic data types and reference data types through IBinder. This method enables data to be transmitted between processes, parcel positioning is a lightweight and efficient object serialization and deserialization mechanism.The Framework has the parcel class. The source code path is:
Frameworks/base/core/java/androi
Upload images from android to qiniu cloud storage server,
I believe that many developers will store images on qiniu. My web site also stores images on qiniu. for image-based websites, this can save a lot of bandwidth.
The key to uploading images to qiniu server is to obtain the upload credential uploadToken. It is too insecure to directly put the AccessKey and Secret on the client, which is easy to decompil
Data storage: SharedpreferencesI. Basic outline1. Description1> is mainly used for storing single small data;2> Storage Type: Boolean, float, String, long, int3> Data Save path:/data/data/packagename/shared_prefs/xxx.xml4> This data is removed when the app is uninstalled (actually---all data under the Package name folder will be removed "PackageName" when the app
Bottom) method, where the first parameter is a millisecond2. Of course, the recommended method is to handle these through a handler , you can invoke the handler object's PostMessage or SendMessage method in a thread's Run method, The Android program maintains a message queue that will handle these rotation, and if you are a WIN32 programmer can understand these message handling well, but there is no way to pretranslatemessage these
The Android system can get the path of the memory card through Environment.getexternalstoragedirectory (), but now there are a lot of phones built in a storage space, but also support the external SD card insertion, This through the Environment.getexternalstoragedirectory () method to obtain is the location of the internal
/node_modules/babel-runtime/regenerator/ RUNTIME.JS:100:21) at GeneratorfunctionprotoType.invoke (/applications/appium.app/contents/resources/node_modules/appium/node_modules/babel-runtime/ REGENERATOR/RUNTIME.JS:136:37) at Run (/applications/appium.app/contents/resources/node_modules/appium/node_ MODULES/BABEL-RUNTIME/NODE_MODULES/CORE-JS/LIBRARY/MODULES/ES6.PROMISE.JS:104:47) at/applications/appium.app/ contents/resources/node_modules/appium/node_modules/babel-runtime/node_modules/core-js/libr
Most of the time, our software needs to store or re-access the processed data. Android provides the following methods for data storage:FileSharedpreferences (parameter)SQLite DatabaseContent Provider)Network
1. File
1.1 Use Files for data storage
Activity provides the openfileoutput () method to output data to a file. The specific implementation process is the same as saving data to a file in the j2se envir
Target: Can I use SQLite database to make a financial file on the PC-side desktop?Directory:Source:Practice:Summary and comparison:About SQLite dataWhat is, what is the internal structure, what is the relationship between the database and the table?What's the use?What is the usual operation?SQLite database UseIncreaseBy deletingChangeCheckThe optimization measures in the practice of SQLite databaseFor the Android
In android, Parcel is used to bind containers that store basic data types and reference data types through IBinder. This method enables data to be transmitted between processes, parcel positioning is a lightweight and efficient object serialization and deserialization mechanism.The Framework has the parcel class. The source code path is:Frameworks/base/core/java/android
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