Steven's Personal Blog

f , err := os . OpenFile ( filename , os . O_APPEND | os . O_WRONLY , 0600 ) if err != nil { panic ( err ) } defer f . Close () if _ , err = f . WriteString ( text ); err != nil { panic ( err ) }

Permission : writeExternalStorage public boolean isStoragePermissionGranted() { if (Build.VERSION. SDK_INT >= 23 ) { if (checkSelfPermission(Manifest.permission. WRITE_EXTERNAL_STORAGE ) == PackageManager. PERMISSION_GRANTED && checkSelfPermission(Manifest.permission. READ_EXTERNAL_STORAGE ) == PackageManager. PERMISSION_GRANTED ) { Log. v ( TAG , "Permission is granted" ); return true ; } else { Log. v ( TAG , "Permission is revoked" ); ActivityCompat. requestPermissions ( this , new String[]{Manifest.permission. WRITE_EXTERNAL_STORAGE }, 1 ); ActivityCompat. requestPermissions ( this , new String[]{Manifest.permission. READ_EXTERNAL_STORAGE }, 1 ); return false ; } } else { //permission is automatically granted on sdk<23 upon installation Log. v ( TAG , "Permission is gra...

Read: FileReader fr = new FileReader(" /data/data/com.example.steven.note/files/ " + fileName); int ch = 0; while ((ch = fr .read()) != -1) {       content += String.valueOf((char) ch); } Write FileOutputStream outputStream = openFileOutput(filename, Context.MODE_PRIVATE); outputStream .write(string.getBytes()); outputStream .close();