Internal Storage in Android

                                                Internal Storage                                  

 You can save files directly on the device's internal storage. By default, files saved to the internal storage are private to your application and other applications cannot access them (nor can the user). When the user uninstalls your application, these files are removed.

Creating and Writing into Internal Storage:

     1.    Create the File with Specifying mode.

          FileOutputStream f = openFileOutput(<FileName>,<Mode>)

     2.    Writing into the File.

          f.Write();

     3.    Close the File

          f.Close()

Reading File from Internal Storage:

         1.    Call FileInputStream with file name and mode.

          FileInputStream f =openFileInput(<FileName>,<Mode>)

         2.    Read the File

          f.read()

         3.    Close the File

         f.close()

Example:

InternalStorageTestActivity.java

public class InternalStorageTestActivity extends Activity

{

                public static final String MY_FILE = "MyFile";

                public String my_value = "Testing My File";

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

       

        try {

                  //Creating File with name and mode

                                                FileOutputStream fos = openFileOutput(MY_FILE, Context.MODE_PRIVATE);

                  //Writing on to the file

                                                fos.write(my_value.getBytes());

                  //closing the File

                                                fos.close();

        }

        catch (FileNotFoundException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                } catch (IOException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                }

                               

                                Button btn = (Button)findViewById(R.id.button1);

                                final Intent it = new Intent(getApplicationContext(), TargetActivity.class);

                                btn.setOnClickListener(new OnClickListener()

                                {

                                               

                                                @Override

                                                public void onClick(View v)

                                                {

                                                                startActivity(it);

                                                }

                                });

    }

}

TargetActivity.java

public class TargetActivity extends Activity {

                /** Called when the activity is first created. */

                @Override

                public void onCreate(Bundle savedInstanceState) {

                    super.onCreate(savedInstanceState);

                   

                    try {

                                //Opening the file with File Name

                                                FileInputStream fip = openFileInput("MyFile.txt");

                                               

                                                //Reading the File

                                                fip.read();

                                               

                                                //Closing the File

                                                fip.close();

                                               

                                } catch (FileNotFoundException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                } catch (IOException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                }

                }

}