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Internal Storage

    • If we want to store the data in the file then we can save these files in the internal storage of the device.
    • When we save files into the internal storage then it is called as private means other applications cannot access these files.
    • When we remove the application then these files also remove from the internal storage.
    • If we want to store the file in internal storage then we have to call the openFileOutput() method. This method returns the object of the FileOutputStream class.
    • This class is used to represent the data through the file.
    • When we call the openFileOutput() method then we have to pass the name of file and mode of file.
    • There are four types of mode as follows:
      • MODE_PRIVATE : this is default mode and in this mode files remain private.
      • MODE_APPEND : if the file is exist that is passed by us as parameter then system will not create new file; use the existing file to add the data.
      • MODE_WORLD_READABLE: when we create these types of files then it increases the risk because any application can read or access this file.
      • MODE_WORLD_WRITABLE: this kind of file can be altered or modified by any other application.
    • After defining the mode, we have to call the write() method using the object of FileOurputStream class, save the file and close the output stream using the close() method.
    • The demo example is below:
String name=”Name”;
FileOutputStream obj = openFileOutput(fileName,Context.MODE_PRIVATE);
obj.write(name.getBytes()); // write data in form of byte only.
obj.close(); // closing stream
    • To read the data from files we have to use the openFileInput() method. This method returns the object of FileInputStream class; and inside this method we have to pass the name of file as a parameter. After that we have to call the read() method using FileInputStream class object as follows:
FileInputStream obj = openFileInput(file_Name);

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