Storage.txt

/*
store data in the app
*/


1- // XML layout

 <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="60dp">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="User Name:"
                android:id="@+id/textView" />

            <EditText
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:inputType="textPersonName"
                android:ems="10"
                android:id="@+id/etUserName" />

        </LinearLayout>

        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="10dp">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="PassWord:"
                android:id="@+id/password" />

            <EditText
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:inputType="textPassword"
                android:ems="10"
                android:id="@+id/etPassword" />
        </LinearLayout>

    </LinearLayout>


    2-- unsecure code
   // shared references files name
    public static final String MyPREFERENCES = "MyPrfLogin" ;
    // key for user name
    public static final String UserName = "UserNameKey";
    // key for password
    public static final String Password = "PasswordKey";
    // shared references instance to access to virtual file
    SharedPreferences sharedpreferences;
    // input text name
    EditText etUserName;
    // input text password
    EditText etPassword;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // initialize  user name  instance with the real input in xml
        etUserName=(EditText)findViewById(R.id.etUserName);
        // initialize  password  instance with the real input in xml
        etPassword=(EditText)findViewById(R.id.etPassword);
        //  // initialize shared references
        sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
        // access to the floating button
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        // listen to floating button when click
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // save data
                 // enable start editing file
                SharedPreferences.Editor editor = sharedpreferences.edit();
                // add user name
                editor.putString(UserName, etUserName.getText().toString());
                // add password
                editor.putString(Password, etPassword.getText().toString());
                // save the update data
                editor.commit();
                //display message saved
                Toast.makeText(MainActivity.this, "Data is Saved", Toast.LENGTH_LONG).show();

            }
        });
    }


//secure code encript
// cipher encryption add shift for key
/*
// cipher encryption add shift for key
  cipher(“hussein”, 10)  // result “r }}osx”
// cipher Decryptions   
cipher(“r }}osx”, -10)  / result “Hussein”
*/
String cipher(String msg, int shift){
    String s = "";
    int len = msg.length(); // get string length
    for(int x = 0; x < len; x++){
        char c = (char)(msg.charAt(x) + shift);  // shift every character
            s += c; // append the characters
    }
    return s;
}