Android Study Day 3 --Android File Read And Write

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read file by path in “/data/data/appName/appPackageName/files”: use method openFileInput(String fileName) of class Context. example:

read file by path in “/resource/raw”: use method openRawResource(int R.raw.fileId) of class Resources. example:

note raw in file general need use EncodingUtils.getString(String data,String charset) decode,and this directory in single file size max 1MB,and only read can’t write.

read file by path in “/resource/asset”: use method open(String fileName) of class AssetManager. example:

note asset in file general need use EncodingUtils.getString(String data,String charset) decode,and this directory in single file size max 1MB,and only read can’t write.

read file by path in “/mnt/sdcard”(compatible version must use Environment.getExternalStorageDirectory()): use direct create FileInputStream or direct create RandomAccessFile. example:

note sdcardin file general need use EncodingUtils.getString(String data,String charset) decode,and check SD card whether or not exist. check SD card whether or not exist code:

write file by path in “/data/data/appName/appPackageName/files”: use method openFileOutput(String fileName,int writeMode) of class Context. example:

write file by path in “/mnt/sdcard”(compatible version must use Environment.getExternalStorageDirectory()): use direct create FileOuputStream or direct create RandomAccessFile. example:

note SD card in write file need at AndroidMainfest.xml setting permission. at AndroidMainfest.xml root node in add code:

note ‘uses-permission’ tag must appears ‘application’ tag before.

comment may on AVD will throw an exception “open file failed:EACCES (permission denied)”,but never appear at really environment.

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