Code of MainActivity.java to display message using Toast

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.btn1);
        final EditText et1 = (EditText) findViewById(R.id.txtname);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText( getApplicationContext(),et1.getText(),Toast.LENGTH_LONG).show();
            }
        });
    }

Code of MainActivity.java to display message using Alert Dialog

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.btn1);
        final EditText et1 = (EditText) findViewById(R.id.txtname);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {


                final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("W3TechBlog Community");

                // Setting Dialog Message
                builder.setMessage("Welcome " + et1.getText() + " to W3TechBlog Community").setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {

                    }
                });

              // Setting Icon to Dialog
                builder.setIcon(R.drawable.ic_launcher_foreground);

                // Setting OK Button






                AlertDialog dialog = builder.create();
                dialog.show();

            }
        });
    }

Code of activity_main.xml