Android login showing error

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Use this 

login.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        if (username.getText().toString().equals("admin") && password.getText().toString().equals("admin")) {

            Intent i = new Intent(Login.this, MainActivity.class);
            startActivity(i);
        }
        else {

        }
    }
});

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