public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button me = (Button)findViewById(R.id.button2);
        me.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent page = new Intent(view.getContext(),Activity2.class);
                startActivityForResult(page,0);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }


}

public class Activity2 extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.myinfo);
    }
}

me.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent page = new Intent(MainActivity.this,Activity2.class);
                    startActivity(page);
                }
            });

Intent i = new Intent(FirstAct.this,SecondAct.class);
                    startActivity(i);

Intent page = new Intent(getApplicationcontext,Activity2.class);
 startActivityForResult(page,0);

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(CurrentActivity.this,ToNavigateActivity.class);
                startActivity(intent);
            }
        });