Data storage and access, permissions under Android

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You can get the control object first in OnCreate

The package name of the/data/data/program/file read/write under this directory may become unreliable due to changes in the package name.

This can be an activity, or it can be a context

This.getfiledir (); data/data/Package Name/files

File

Shared

Use the API to dynamically acquire SD cards, and to determine if there is an SD card

The "mounted" status is found.

File sccardfile = Environment.getexternalstoragedirectory ();

Read and write SD card requires permission,

Get the remaining free space on the SD card

Get Cache Directory

Android Read and Write permissions issues

/data/data/Package Name/files/aaa.txt

Openfileoutput ("Aaa.txt", Context.)

Permission-related

1. Private files

2. Writable files

3. Readable files

4. Readable and writable files

Read other people's things can not be dynamically acquired, Roar

Sharedperference: Where to store it:

XML serialization and parsing

POM: A little analysis, can stop, use more

Dom: Read all to Memory

Sax: A little parsing, can't stop

Generating an XML file using the Pull parser

Write XML to Local

Parsing from native XML

Data storage and access, permissions under Android