[ Android ] : Push a button goto another activity page

sample code:

        Button btn_go = (Button) findViewById(R.id.button_test);

        btn_go.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

            Intent intent = new Intent();

            intent.setClass(MainActivity.this, PlayActivity.class);

            startActivity(intent);             

            }

        });