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fragment实现底部导航栏不刷新切换
2022-06-10 10:26:00 【温正实】
安卓自带的底部导航栏每次切换fragment都会刷新数据，用户体验会很不好，
所以自己做了个不会刷新的fragment切换的底部导航栏
先看效果，我上传一个录屏，请看效果（首页时c站的一个链接）：
捂脸，上传审核，于是我把录屏转成gif图片，请看
MainActivity+HomeFragment+Notificationfragment+Minefragment
1.MainActivity代码
package com.xmkjstudio.jyj9;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import com.xmkjstudio.jyj9.fragment.HomeFragment;
import com.xmkjstudio.jyj9.fragment.MineFragment;
import com.xmkjstudio.jyj9.fragment.NotificationFragment;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private FragmentManager fragmentManager;
private FragmentTransaction fragmentTransaction;
private HomeFragment homeFragment;
private NotificationFragment notificationFragment;
private MineFragment mineFragment;
private FragmentTransaction ft;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.tab_1_img).setOnClickListener(this);
findViewById(R.id.tab_1_txt).setOnClickListener(this);
findViewById(R.id.tab1_contain).setOnClickListener(this);
findViewById(R.id.tab_2_img).setOnClickListener(this);
findViewById(R.id.tab_2_txt).setOnClickListener(this);
findViewById(R.id.tab2_contain).setOnClickListener(this);
findViewById(R.id.tab_3_img).setOnClickListener(this);
findViewById(R.id.tab_3_txt).setOnClickListener(this);
findViewById(R.id.tab3_contain).setOnClickListener(this);
// addToIndex();
homeFragment=new HomeFragment();
notificationFragment=new NotificationFragment();
mineFragment=new MineFragment();
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.add(R.id.frame,homeFragment).commit();
//
// fragmentManager=getSupportFragmentManager();
// fragmentTransaction=fragmentManager.beginTransaction();
}
@Override
public void onClick(View v) {
fragmentTransaction=fragmentManager.beginTransaction();
FragmentTransaction transaction = fragmentManager.beginTransaction().setCustomAnimations(
android.R.anim.fade_in, android.R.anim.fade_out);
switch (v.getId()){
//tab1
case R.id.tab_1_txt:
break;
case R.id.tab_1_img:
break;
case R.id.tab1_contain:
if(notificationFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(notificationFragment).commit();
}
if(mineFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(mineFragment).commit();
}
if(homeFragment.isAdded()) {
if(notificationFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(notificationFragment).commit();
}
if(mineFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(mineFragment).commit();
}
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.show(homeFragment).commit();
}else{
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.add(R.id.frame, homeFragment).commit();
}
break;
//tab2
case R.id.tab_2_txt:
break;
case R.id.tab_2_img:
break;
case R.id.tab2_contain:
if(homeFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(homeFragment).commit();
}
if(mineFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(mineFragment).commit();
}
if(notificationFragment.isAdded()){
if(homeFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(homeFragment).commit();
}
if(mineFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(mineFragment).commit();
}
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.show(notificationFragment).commit();
}else {
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.add(R.id.frame, notificationFragment).commit();
}
break;
//tab3
case R.id.tab_3_txt:
break;
case R.id.tab_3_img:
break;
case R.id.tab3_contain:
if(homeFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(homeFragment).commit();
}
if(notificationFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(notificationFragment).commit();
}
if(mineFragment.isAdded()){
if(homeFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(homeFragment).commit();
}
if(notificationFragment.isAdded()){
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.hide(notificationFragment).commit();
}
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.show(mineFragment).commit();
}else {
fragmentManager = getSupportFragmentManager();
ft = fragmentManager.beginTransaction();
ft.add(R.id.frame, mineFragment).commit();
}
break;
}
fragmentTransaction.commit();
}
//提前加载
// private void addToIndex(){
//
// fragmentManager=getSupportFragmentManager();
// fragmentTransaction=fragmentManager.beginTransaction();
// if(homeFragment==null){
// homeFragment=new HomeFragment();
// }
// fragmentTransaction.replace(R.id.frame,homeFragment);
//
//
// fragmentTransaction.commit();
// }
}activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/frame"
android:orientation="vertical"
android:layout_weight="0.8"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<!--导航栏-->
<LinearLayout
android:layout_marginTop="5dp"
android:layout_weight="9.2"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--tab1-->
<LinearLayout
android:id="@+id/tab1_contain"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/tab_1_img"
android:src="@drawable/ic_launcher_background"
android:layout_width="30dp"
android:layout_height="30dp"/>
<TextView
android:id="@+id/tab_1_txt"
android:text="经验记"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<!--tab2-->
<LinearLayout
android:id="@+id/tab2_contain"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/tab_2_img"
android:src="@drawable/ic_launcher_background"
android:layout_width="30dp"
android:layout_height="30dp"/>
<TextView
android:id="@+id/tab_2_txt"
android:text="消息"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<!--tab3-->
<LinearLayout
android:id="@+id/tab3_contain"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/tab_3_img"
android:src="@drawable/ic_launcher_background"
android:layout_width="30dp"
android:layout_height="30dp"/>
<TextView
android:id="@+id/tab_3_txt"
android:text="我"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>HomeFragment
package com.xmkjstudio.jyj9.fragment;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import com.xmkjstudio.jyj9.R;
/**
* A simple {@link Fragment} subclass.
* Use the {@link HomeFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class HomeFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public HomeFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment HomeFragment.
*/
// TODO: Rename and change types and number of parameters
public static HomeFragment newInstance(String param1, String param2) {
HomeFragment fragment = new HomeFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_home, container, false);
WebView webView=view.findViewById(R.id.webview);
webView.loadUrl("https://blog.csdn.net/b305723/ar" +
"ticle/details/101892612?ops_request_misc=" +
"%257B%2522request%255Fid%2522%253A%2522165" +
"447567616782184659916%2522%252C%2522scm%25" +
"22%253A%252220140713.130102334..%2522%257D" +
"&request_id=165447567616782184659916&biz_i" +
"d=0&utm_medium=distribute.pc_search_result" +
".none-task-blog-2~all" +
"~sobaiduend~default-1-101892612-null-null." +
"142^v11^control,157^v13^new_style1&utm_" +
"term=fragment里面怎么写代码&spm=1018.2226.3001.4187");
return view;
}
}fragment_home.x m l
<?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"
tools:context=".fragment.HomeFragment">
<!-- TODO: Update blank fragment layout -->
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</FrameLayout>NotificationFragment代码
package com.xmkjstudio.jyj9.fragment;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.xmkjstudio.jyj9.R;
/**
* A simple {@link Fragment} subclass.
* Use the {@link NotificationFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class NotificationFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public NotificationFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment NotificationFragment.
*/
// TODO: Rename and change types and number of parameters
public static NotificationFragment newInstance(String param1, String param2) {
NotificationFragment fragment = new NotificationFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_notification, container, false);
}
}fragment_notification.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="@mipmap/ic_launcher"
tools:context=".fragment.NotificationFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
</FrameLayout>Minefragment代码
package com.xmkjstudio.jyj9.fragment;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.xmkjstudio.jyj9.R;
/**
* A simple {@link Fragment} subclass.
* Use the {@link MineFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MineFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public MineFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MineFragment.
*/
// TODO: Rename and change types and number of parameters
public static MineFragment newInstance(String param1, String param2) {
MineFragment fragment = new MineFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_mine, container, false);
}
}fragmen_mine.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:background="@drawable/ic_launcher_background"
android:layout_height="match_parent"
tools:context=".fragment.MineFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
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