用按钮链接片段

Question

有人能帮我吗？我只想在一个活动中添加2个按钮，每个按钮都指向不同的片段例如：按钮1转到Login_Fragment
按钮2转到SignUp_Fragment这些片段有自己的xml文件下面的代码是FirstPage，它的xml是FirstPage因此，下面的代码将用fragments xml文件替换firstpage xml我该如何防止这种情况发生？

package com.example.logindesign;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
public class First_Page extends AppCompatActivity {
Button createAccount, login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first_page);

createAccount = findViewById(R.id.createAccount);
createAccount.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fm = getSupportFragmentManager();
SignUp_Fragment f2 = new SignUp_Fragment();
fm.beginTransaction().replace(R.id.mParent, f2).commit();
}
});

login = findViewById(R.id.login);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fm = getSupportFragmentManager();
Login_Fragment f2 = new Login_Fragment();
fm.beginTransaction().add(R.id.mParent, f2).commit();
}
});
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/Blue"
android:id="@+id/mParent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/stay_connected_with_friends"
android:textSize="28sp"
android:textColor="@color/white"
android:fontFamily="@font/nunito_bold"
android:layout_marginTop="230dp"
android:layout_centerHorizontal="true"
android:layout_marginBottom="200dp"
>
</TextView>

<Button
android:id="@+id/createAccount"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="@color/Blue"
android:fontFamily="@font/nunito_bold"
android:text="@string/sign_up"
android:textColor="@color/white"
android:textSize="25sp">
</Button>
<Button
android:id="@+id/login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginStart="200dp"
android:layout_marginBottom="172dp"
android:background="@color/Blue"
android:fontFamily="@font/nunito_bold"
android:text="@string/login"
android:textColor="@color/white"
android:textSize="25sp">
</Button>
<ImageView
android:id="@+id/imageView"
android:layout_width="175dp"
android:layout_height="141dp"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="114dp"
android:layout_marginBottom="136dp"
android:contentDescription="@string/logo"
app:srcCompat="@drawable/logo" />


</RelativeLayout>

Answer 1

使用这样的代码，点击按钮A，

Fragment A = new FragmentA();

点击按钮B，

Fragment B = new FragmentB();

并为两个加载片段、生成函数

public void loadFragment(Fragment f)
{
FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction().replace(R.id.main_contenier,f).commit();
}

Answer 2

我使用FragmentManager
https://developer.android.com/reference/androidx/fragment/app/FragmentManager?hl=en并使用标签确定导航流程

class MainMenuFragment : Fragment() {
private lateinit var supportFragmentManager: FragmentManager

override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
viewFragment = inflater.inflate(R.layout.main_menu_fragment, container, false)
supportFragmentManager = activity!!.supportFragmentManager
val buttonDocumentList: Button = viewFragment.findViewById(R.id.btn_menu_top_left)
buttonDocumentList.setOnClickListener {
replaceFragment(
DocumentListFragment.newInstance(), "${FragmentTypes.DOCUMENT_LIST}"
)
}

private fun replaceFragment(fragment: Fragment, tag: String) {
supportFragmentManager.beginTransaction()
.replace(R.id.main_activity_container, fragment, tag)
.commitNow()
}