问我如何从一个活动中找到一个片段？

EN

public class MainActivity extends AppCompatActivity {




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



        TextView forgot_password  = findViewById(R.id.forgot_password);
        TextView Signing_Up = findViewById(R.id.Signing_Up);
        TextView Sign_In =findViewById(R.id.Sign_In);


        Signing_Up.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){

                Intent intent = new Intent(v.getContext(),Signup.class);
                startActivityForResult(intent, 0);
            }
        });




        forgot_password.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){

                Intent intent = new Intent(v.getContext(),Forgot_password.class);
                startActivityForResult(intent, 0);
            }
        });

        Sign_In.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){

                Intent intent = new Intent(v.getContext(),HomeFragment.class);
                startActivityForResult(intent, 0);
            }
        });









    }

    public void signUpPage(View view) {
    }
}