Learn android from scratch (Data Storage (1) SharedPreferences attribute file. 35 .)
There are five ways to save data in android:
Shared Preferences
Store private primitive data in key-value pairs.
Key-value pairs of the corresponding attribute file storage
Internal Storage
Store private data on the
Currently, all devices that can be searched by chance involve file operations, such as computers and mobile phones. Android file operations are similar to those on computers. They can be stored in the built-in storage of mobile phones or SD cards. This blog mainly introduces file operations in the built-in storage of m
About the file storage of Android, here is the file class in Java, according to the idea of object-oriented, the operation of the file in Java has also been encapsulated object, the operation of the file class is the files class, file
debugging is placed. Proc: The system information provided by various files under the/proc file system is not specific to a particular process, but can be used throughout the system-wide context. Data: Store user-installed software and a variety of information. Root: Nothing at all. Dev: Needless to say, the place where the device node files are stored. The following documents are not directories: runme.sh script for automatic mount action of EXT2
set transparency android:rotation rotation degree Android:rotationx horizontal rotation degrees Android: RotationY Vertical Rotation degree Android:scalex setting X-axis scaling Android:scaley Setting the y-axis zoom android:verticalscrollbarposition The position of the vertical scroll bar android: Layertype setting supports android:layoutdirection defining the orientation of layout sheets android:textdire
Android:alpha set transparency android:rotation rotation degree Android:rotationx horizontal rotation degrees Android: RotationY Vertical Rotation degree Android:scalex setting X-axis scaling Android:scaley Setting the y-axis zoom android:verticalscrollbarposition The position of the vertical scroll bar android: Layertype setting supports android:layoutdirection defining the orientation of layout sheets an
Preface
This article describes how to parse XML files in Android. It mainly uses the SAX mechanism, which is called Simple API for XML. It is both an interface and a software package. As an interface, SAX is a standard interface for event-driven XML parsing. XML file parsing generally involves two methods: DOM and SAX. The DOM must first read all xml documents into the computer memory. This method is not
abstract In fact, the operation of the Android file and Java in the PC environment is not two, the reason why need to be explained separately is because the Android system provides different from the PC to access the file system root path of the API, while the application of a private
An example of this article summarizes the Android file read and write operation. Share to everyone for your reference, specific as follows:
Files in Android are placed in different locations, and they are read in a number of different ways.In this paper, the ways and methods of reading the resource files, reading the data area files, reading and randomaccessfile
Original link: http://m.blog.csdn.net/article/details?id=17725989abstract In fact, the operation of the Android file and Java in the PC environment is not two, the reason why need to be explained separately is because the Android system provides different from the PC to access the file system root path of the API, whil
The early Android system almost only supported the ARMV5 CPU architecture, do you know how many of these are supported today? 7 kinds.The Android system now supports the following seven different CPU architectures: ARMV5. ARMV7 (since 2010), x86 (from 2011 onwards), MIPS (from 2012 onwards), Armv8,mips64 and x86_64 (from 2014), each of which is associated with a corresponding ABI.The Application Binary inte
Resources in Android refer to non-code parts, such as clips, audios, videos, and characters. Generally, we store native files in assets. For example, MP3 files cannot be directly accessed by Android programs. They must be read as binary streams through the AssetManager class. Layout files are generally stored in the res folder, such as anim, drawable, layout, values, xml, raw, and menu. These resources can
Based on the information available, you 've got an XML error, and it's on line 2 of COM. mmiku. todolist. todolistitemview. because the com. mmiku. todolist. error Caused by todolistitemview not found. correct.
11-30 01:45:52. 610: E/androidruntime (545): Android. View. inflateexception: Binary XML file line #2: Error inflating class com. mmiku. todolist. todolistitemview
11-30 01:45:52. 610: E/androidrunti
The general process is divided into the following six steps:
1. Install java_jdk
2. Configure java environment variables
3. Update the android sdk
4. Release the apk file from Unity3d
5. Create and run the android Virtual Machine
6. Install the apk file on the android virtua
This article briefly introduces how to use the ant script Android project to compile and package it into an APK file and install it on your mobile phone.
Main steps:
1. Generate the R. Java file: Use ant and command line to generate R. Java using the aapt. Ext program provided by Android SDK.2. Generate the. aidl
The android getView method is not executed because the layout file does not display the list.
One reason is that the layout file does not display the position in the list.
For example, the following Layout
Android: id = "@ + id/list_find"
Android: layout_width = "mat
For example, the Login program of Android and the Helloworld program of Android cannot run a correct program correctly. It has been depressing for a long time, finally, after a test, the program of the self-built project was successfully run in the Android simulator. The following is a summary of the procedure startup interface settings:
In the
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