SharedPreferences#003

public class MainActivity extends AppCompatActivity {
    Button reg ;
    Button sho;
    EditText user;
    EditText pass;
    TextView show;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        reg = (Button)findViewById(R.id.reg);
        sho = (Button)findViewById(R.id.show);
        user = (EditText)findViewById(R.id.name);
        pass = (EditText)findViewById(R.id.pass);
        show = (TextView)findViewById(R.id.textView);

        reg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                save(view);
            }
        });

        sho.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                read(view);
            }
        });


    }



    public void save (View view){
        SharedPreferences save = getSharedPreferences("userinfo", Context.MODE_PRIVATE);

        SharedPreferences.Editor editor = save.edit();

        editor.putString("username",user.getText().toString());
        editor.putString("pass",pass.getText().toString());
        editor.apply();
    }

    public void read (View view){
        SharedPreferences save = getSharedPreferences("userinfo", Context.MODE_PRIVATE);

        String name = save.getString("username","");
        String pass = save.getString("pass","");
        show.setText(name);

    }