สร้าง Fragment ขึ้นมาใหม่ชื่อ DynamicFragment

เรียกใช้ DynamicFragment จาก source code โดยสามารถ show ได้และ hide ได้

ไฟล์ที่เกี่ยวข้อง

• activity_main.xml
• MainActivity.java
• fragment_dynamic.xml
• DynamicFragment.java

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <GridLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginBottom="20dp">

        <Button
            android:id="@+id/buttonShow"
            android:text="Show Fragment"
            android:textAllCaps="false"
            android:textSize="18sp" />

        <Button
            android:id="@+id/buttonHide"
            android:text="Hide Fragment"
            android:textAllCaps="false"
            android:textSize="18sp" />
    </GridLayout>

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

MainActivity.java

package com.phaisarn.myapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

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

        final DynamicFragment fragment = new DynamicFragment();

        Button buttonShow = findViewById(R.id.buttonShow);
        buttonShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showFragment(fragment);
            }
        });

        Button buttonHide = findViewById(R.id.buttonHide);
        buttonHide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hideFragment(fragment);
            }
        });
    }

    private void showFragment(Fragment fragment) {
        FragmentManager fragMan = getSupportFragmentManager();
        FragmentTransaction fragTran = fragMan.beginTransaction();
        if (!fragment.isAdded()) {
            fragTran.add(R.id.frameLayout, fragment);
        } else if (fragment.isHidden()) {
            fragTran.show(fragment);
        }
        fragTran.commit();
    }

    private void hideFragment(Fragment fragment) {
        if (fragment.isAdded() && fragment.isVisible()) {
            getSupportFragmentManager()
                    .beginTransaction()
                    .hide(fragment)
                    .commit();
        }
    }
}

fragment_dynamic.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#cde"
    tools:context=".DynamicFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="30dp"
        android:text="ข้อความนี้อยู่ใน Fragment"
        android:textSize="20sp" />

</FrameLayout>

DynamicFragment.java

package com.phaisarn.myapplication;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class DynamicFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup viewGroup, Bundle bundle) {

        return inflater.inflate(R.layout.fragment_dynamic, viewGroup, false);
    }
}