Android does not insert the file write and read method in SD case _android

When Android is developed, you will encounter the following scenarios
I want the application to download to the root of the current application, not the SD card
This file can then be accessed by the application or other application at any time, with permissions that are read globally

File writes can be made using the context's local file output stream at this time
Note to give the file writable Read permission, otherwise the file will be read with an error
FileOutputStream fos = context.openfileoutput (Savefilename,
Context.mode_world_writeable
| context.mode_world_readable);
Then read the file to get to the input stream using Context.openfileinput
You can also use Context.getfilestreampath (name) to get its file instance, which is especially useful when you want to download a apk to the local and open it.

Finally, notice that the permission statement is being filled in the configuration file.