Android saves and reads data to files

Android saves and reads data to files

Android gets fileoutputstream

Context. openfileoutput (file, permission)

Context is the context of the environment, and activity inherits the ccontext class.For exampleAA inherits Activity
You can write it like this.: AA. This. openfileoutput (file, permission)

File: Name and extension of the file created for the user, such as water.txt

Permission: Android has four Permissions

1. Context. mode_private

Private Attribute, accessible only by yourself, and the content written for the second time will overwrite the content written for the first time

2. Context. mode_append

Private Attribute, accessible only by yourself. The content written for the second time will be appended to the end of the content written for the first time.

3. Context. mode_world_writeable

Public attributes can be written to other projects, but the content written for the second time will overwrite the content written for the first time.

4. Context. mode_world_readable

Public attributes, which can be read by other projects

Permissions can be added, for example

Now I want another project to read, write, and append.

Context. mode_world_readable + context. mode_world_writeable + context. mode_append

Files created by Android are stored in/data/package name/files on the mobile phone.

 

Android gets fileinputstream

Context. openinfileoutput (file)

Context is the context of the environment, and activity inherits the context class.

File: Name and extension of the file created for the user, such as water.txt