Modify:创建ViewPager2的基础adapter封装。Fragment，Activity的数据状态帮助类重写封装。

2021-08-05 17:45:42 +08:00
parent 9e8863ea28
commit c89d700fac
13 changed files with 523 additions and 119 deletions
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameActivity.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameActivity.kt
@ -1,13 +1,17 @@
 package com.quyunshuo.androidbaseframemvvm.base.mvvm.v

 import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
 import androidx.viewbinding.ViewBinding
 import com.alibaba.android.arouter.launcher.ARouter
 import com.quyunshuo.androidbaseframemvvm.base.mvvm.vm.BaseViewModel
-import com.quyunshuo.androidbaseframemvvm.base.utils.*
+import com.quyunshuo.androidbaseframemvvm.base.utils.BindingReflex
+import com.quyunshuo.androidbaseframemvvm.base.utils.EventBusRegister
+import com.quyunshuo.androidbaseframemvvm.base.utils.EventBusUtils
 import com.quyunshuo.androidbaseframemvvm.base.utils.network.AutoRegisterNetListener
 import com.quyunshuo.androidbaseframemvvm.base.utils.network.NetworkStateChangeListener
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.imp.BaseFrameViewStatusHelperImp
+import com.quyunshuo.androidbaseframemvvm.base.utils.toast

 /**
 * Activity基类
@ -15,7 +19,7 @@ import com.quyunshuo.androidbaseframemvvm.base.utils.network.NetworkStateChangeL
 * @author Qu Yunshuo
 * @since 8/27/20
 */
-abstract class BaseFrameActivity<VB : ViewBinding, VM : BaseViewModel> : AppCompatActivity(),
+abstract class BaseFrameActivity<VB : ViewBinding, VM : BaseViewModel> : BaseFrameStatusActivity(),
    FrameView<VB>, NetworkStateChangeListener {

    protected val mBinding: VB by lazy(mode = LazyThreadSafetyMode.NONE) {
@ -25,15 +29,13 @@ abstract class BaseFrameActivity<VB : ViewBinding, VM : BaseViewModel> : AppComp
    protected abstract val mViewModel: VM

    /**
-     * activity页面重建帮助类
+     * 基础UI状态管理工具 保存了是否重建的状态信息
     */
-    private var mStatusHelper: ActivityRecreateHelper? = null
+    private lateinit var mStatusHelper: BaseFrameViewStatusHelperImp

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(mBinding.root)
-        //处理保存的装填
-        mStatusHelper?.onRestoreInstanceStatus(savedInstanceState)
        // ARouter 依赖注入
        ARouter.getInstance().inject(this)
        // 注册EventBus
@ -77,24 +79,13 @@ abstract class BaseFrameActivity<VB : ViewBinding, VM : BaseViewModel> : AppComp
        toast(if (isConnected) "网络已连接" else "网络已断开")
    }

-    override fun isRecreate(): Boolean = mStatusHelper?.isRecreate ?: false
+    override fun isRecreate(): Boolean = mStatusHelper.isRecreate

-    override fun onSaveInstanceState(outState: Bundle) {
-        if (mStatusHelper == null) {
-            //仅当触发重建需要保存状态时创建对象
-            mStatusHelper = ActivityRecreateHelper(outState)
-        } else {
-            mStatusHelper?.onSaveInstanceState(outState)
-        }
-        super.onSaveInstanceState(outState)
+    override fun onRegisterStatusHelper(): ViewStatusHelper? {
+        mStatusHelper = BaseFrameViewStatusHelperImp(super.onRegisterStatusHelper())
+        return mStatusHelper
    }

-    /**
-     * - activity 重建帮助工具类
-     */
-    private class ActivityRecreateHelper(savedInstanceState: Bundle? = null) :
-        ViewRecreateHelper(savedInstanceState)
-
    override fun onDestroy() {
        if (javaClass.isAnnotationPresent(EventBusRegister::class.java)) EventBusUtils.unRegister(
            this
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameFragment.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameFragment.kt
@ -4,14 +4,14 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import androidx.fragment.app.Fragment
 import androidx.viewbinding.ViewBinding
 import com.alibaba.android.arouter.launcher.ARouter
 import com.quyunshuo.androidbaseframemvvm.base.mvvm.vm.BaseViewModel
 import com.quyunshuo.androidbaseframemvvm.base.utils.BindingReflex
 import com.quyunshuo.androidbaseframemvvm.base.utils.EventBusRegister
 import com.quyunshuo.androidbaseframemvvm.base.utils.EventBusUtils
-import com.quyunshuo.androidbaseframemvvm.base.utils.ViewRecreateHelper
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.imp.BaseFrameViewStatusHelperImp

 /**
 * Fragment基类
@ -19,7 +19,7 @@ import com.quyunshuo.androidbaseframemvvm.base.utils.ViewRecreateHelper
 * @author Qu Yunshuo
 * @since 8/27/20
 */
-abstract class BaseFrameFragment<VB : ViewBinding, VM : BaseViewModel> : Fragment(), FrameView<VB> {
+abstract class BaseFrameFragment<VB : ViewBinding, VM : BaseViewModel> : BaseFrameStatusFragment(), FrameView<VB> {

    protected val mBinding: VB by lazy(mode = LazyThreadSafetyMode.NONE) {
        BindingReflex.reflexViewBinding(javaClass, layoutInflater)
@ -28,9 +28,10 @@ abstract class BaseFrameFragment<VB : ViewBinding, VM : BaseViewModel> : Fragmen
    protected abstract val mViewModel: VM

    /**
-     * fragment状态保存工具类
+     * 基础UI状态管理工具
     */
-    private var mStatusHelper: FragmentStatusHelper? = null
+    private lateinit var mBaseStatusHelper: BaseFrameViewStatusHelperImp
+

    override fun onCreateView(
        inflater: LayoutInflater,
@ -42,8 +43,6 @@ abstract class BaseFrameFragment<VB : ViewBinding, VM : BaseViewModel> : Fragmen

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
-        //处理恢复
-        mStatusHelper?.onRestoreInstanceStatus(savedInstanceState)
        // ARouter 依赖注入
        ARouter.getInstance().inject(this)
        // 注册EventBus
@ -54,28 +53,13 @@ abstract class BaseFrameFragment<VB : ViewBinding, VM : BaseViewModel> : Fragmen
        initRequestData()
    }

-    override fun isRecreate(): Boolean = mStatusHelper?.isRecreate ?: false
+    override fun isRecreate(): Boolean = mBaseStatusHelper.isRecreate

-    /**
-     * 页面可能重建的时候回执行此方法，进行当前页面状态保存
-     */
-    override fun onSaveInstanceState(outState: Bundle) {
-        if (mStatusHelper == null) {
-            //仅当触发重建需要保存状态时创建对象
-            mStatusHelper = FragmentStatusHelper(outState)
-        } else {
-            mStatusHelper?.onSaveInstanceState(outState)
-        }
-        super.onSaveInstanceState(outState)
+    override fun onRegisterStatusHelper(): ViewStatusHelper? {
+        mBaseStatusHelper = BaseFrameViewStatusHelperImp(super.onRegisterStatusHelper())
+        return mBaseStatusHelper
    }

-    /**
-     * - fragment状态保存帮助类；
-     * - 暂时没有其他需要保存的--空继承
-     */
-    private class FragmentStatusHelper(savedInstanceState: Bundle? = null) :
-        ViewRecreateHelper(savedInstanceState)
-
    override fun onDestroy() {
        if (javaClass.isAnnotationPresent(EventBusRegister::class.java)) EventBusUtils.unRegister(
            this
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameStatusActivity.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameStatusActivity.kt
@ -0,0 +1,41 @@
+package com.quyunshuo.androidbaseframemvvm.base.mvvm.v
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
+
+/**
+ * @author DBoy 2021/8/5 <p>
+ * - 文件描述 : 基础状态管理Activity
+ */
+open class BaseFrameStatusActivity : AppCompatActivity() {
+    /**
+     * 基础状态管理帮助类
+     */
+    private var mBaseStatusHelper: ViewStatusHelper? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        //注册状态帮助类
+        mBaseStatusHelper = onRegisterStatusHelper()
+        //恢复状态数据
+        mBaseStatusHelper?.onRestoreInstanceStatus(savedInstanceState)
+    }
+
+    /**
+     * 保存状态
+     */
+    override fun onSaveInstanceState(outState: Bundle) {
+        mBaseStatusHelper?.onSaveInstanceState(outState)
+        super.onSaveInstanceState(outState)
+    }
+
+    /**
+     * 注册状态管理帮助类,子类重写此方法以注册帮助类。
+     * 每一层都有可能有自己的状态管理帮助类，所以继承重写的时候，需要将super的对象传入自己的帮助类构造函数中
+     */
+    protected open fun onRegisterStatusHelper(): ViewStatusHelper? {
+        return null
+    }
+
+}
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameStatusFragment.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/mvvm/v/BaseFrameStatusFragment.kt
@ -0,0 +1,42 @@
+package com.quyunshuo.androidbaseframemvvm.base.mvvm.v
+
+import android.os.Bundle
+import android.view.View
+import androidx.fragment.app.Fragment
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
+
+/**
+ * @author DBoy 2021/8/5 <p>
+ * - 文件描述 : 基础状态管理Fragment
+ */
+open class BaseFrameStatusFragment : Fragment() {
+    /**
+     * 基础状态管理帮助类
+     */
+    private var mBaseStatusHelper: ViewStatusHelper? = null
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        //注册状态帮助类
+        mBaseStatusHelper = onRegisterStatusHelper()
+        //恢复状态数据
+        mBaseStatusHelper?.onRestoreInstanceStatus(savedInstanceState)
+    }
+
+    /**
+     * 保存状态
+     */
+    override fun onSaveInstanceState(outState: Bundle) {
+        mBaseStatusHelper?.onSaveInstanceState(outState)
+        super.onSaveInstanceState(outState)
+    }
+
+    /**
+     * 注册状态管理帮助类,子类重写此方法以注册帮助类。
+     * 每一层都有可能有自己的状态管理帮助类，所以继承重写的时候，需要将super的对象传入自己的帮助类构造函数中
+     */
+    protected open fun onRegisterStatusHelper(): ViewStatusHelper? {
+        return null
+    }
+
+}
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/utils/ViewRecreateHelper.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/utils/ViewRecreateHelper.kt
@ -1,42 +0,0 @@
-package com.quyunshuo.androidbaseframemvvm.base.utils
-
-import android.os.Bundle
-
-/**
- * @author DBoy 2021/7/8
- *
- * - 文件描述 : 视图，activity，fragment重建帮助类
- */
-open class ViewRecreateHelper(savedInstanceState: Bundle?=null) {
-    /**
-     * 重建标记key
-     */
-    private val KEY_RECREATE = "recreate"
-
-    /**
-     * 是否重建
-     */
-    var isRecreate = false
-        private set
-
-    init {
-        if (savedInstanceState!=null) {
-            this.onSaveInstanceState(savedInstanceState)
-        }
-    }
-
-    /**
-     * 恢复状态
-     */
-    open fun onRestoreInstanceStatus(savedInstanceState: Bundle?) {
-        isRecreate = savedInstanceState?.getBoolean(KEY_RECREATE) ?: false
-    }
-
-    /**
-     * 保存状态
-     */
-    open fun onSaveInstanceState(bundle: Bundle) {
-        bundle.putBoolean(KEY_RECREATE, true)
-    }
-
-}
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/utils/status/ViewStatusHelper.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/utils/status/ViewStatusHelper.kt
@ -0,0 +1,18 @@
+package com.quyunshuo.androidbaseframemvvm.base.utils.status
+
+import android.os.Bundle
+
+/**
+ * @author DBoy 2021/8/5 <p>
+ * - 文件描述 : 采用了一种链式调用，所有对象持有自己父级帮助类，进行场景回复时先恢复链头的数据
+ */
+abstract class ViewStatusHelper(val parentViewStatusHelper: ViewStatusHelper?) {
+
+    open fun onRestoreInstanceStatus(savedInstanceState: Bundle?) {
+        parentViewStatusHelper?.onRestoreInstanceStatus(savedInstanceState)
+    }
+
+    open fun onSaveInstanceState(bundle: Bundle) {
+        parentViewStatusHelper?.onSaveInstanceState(bundle)
+    }
+}
--- a/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/utils/status/imp/BaseFrameViewStatusHelperImp.kt
+++ b/lib_base/src/main/java/com/quyunshuo/androidbaseframemvvm/base/utils/status/imp/BaseFrameViewStatusHelperImp.kt
@ -0,0 +1,40 @@
+package com.quyunshuo.androidbaseframemvvm.base.utils.status.imp
+
+import android.os.Bundle
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
+
+/**
+ * @author DBoy 2021/7/8
+ *
+ * - 文件描述 : 视图，activity，fragment重建帮助类
+ */
+open class BaseFrameViewStatusHelperImp(parentViewStatusHelper: ViewStatusHelper? = null) : ViewStatusHelper(parentViewStatusHelper) {
+    /**
+     * 重建标记key 以包名保存数据可以防止嵌套层级出现重复Key
+     */
+    private val KEY_RECREATE = "com.quyunshuo.androidbaseframemvvm.base.utils.status.BaseFrameViewStatusHelperImp.Recreate"
+
+    /**
+     * 是否重建
+     */
+    var isRecreate = false
+        private set
+
+
+    /**
+     * 恢复状态
+     */
+    override fun onRestoreInstanceStatus(savedInstanceState: Bundle?) {
+        super.onRestoreInstanceStatus(savedInstanceState)
+        isRecreate = savedInstanceState?.getBoolean(KEY_RECREATE) ?: false
+    }
+
+    /**
+     * 保存状态
+     */
+    override fun onSaveInstanceState(bundle: Bundle) {
+        super.onSaveInstanceState(bundle)
+        bundle.putBoolean(KEY_RECREATE, true)
+    }
+
+}
--- a/lib_common/src/main/java/com/quyunshuo/androidbaseframemvvm/common/ui/BaseFragmentStateAdapter.kt
+++ b/lib_common/src/main/java/com/quyunshuo/androidbaseframemvvm/common/ui/BaseFragmentStateAdapter.kt
@ -0,0 +1,176 @@
+package com.quyunshuo.androidbaseframemvvm.common.ui
+
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentActivity
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.RecyclerView
+import androidx.viewpager2.adapter.FragmentStateAdapter
+import kotlin.random.Random
+
+/**
+ * @author DBoy 2021/8/5 <p>
+ * - 文件描述 : ViewPager2 FragmentAdapter封装
+ * - 对于元数据[mData]的增加删除操作只能通过内部提供的4种方式进行操作:
+ *     - [setNewData]
+ *     - [addNewData]
+ *     - [addData]
+ *     - [removeData]
+ * - 内部使用[DiffUtil]工具实现更新UI,不需调用[notifyDataSetChanged]等一系列方法。
+ */
+abstract class BaseFragmentStateAdapter<T> : FragmentStateAdapter {
+
+    private val TAG = "FragmentAdapter"
+
+    /**
+     * 记录生成的Fragment id列表
+     */
+    private var mFragmentIdMap = mutableMapOf<T, Long>()
+
+    /**
+     * 需要生成页面的数据
+     */
+    var mData: MutableList<T>
+        set(value) {
+            field = value
+            mFragmentIdMap.clear()
+            createFragmentsIds(field)
+        }
+
+    constructor(fragment: Fragment, data: MutableList<T> = mutableListOf()) : super(fragment) {
+        mData = data
+    }
+
+    constructor(activity: FragmentActivity, data: MutableList<T> = mutableListOf()) : super(
+        activity
+    ) {
+        mData = data
+    }
+
+    /**
+     * 获取需要创建几个Fragment
+     */
+    override fun getItemCount(): Int = mData.size
+
+    /**
+     * 创建Fragment
+     */
+    final override fun createFragment(position: Int): Fragment {
+        return createFragment(mData[position], position)
+    }
+
+    /**
+     * 创建fragment 传递数据
+     */
+    abstract fun createFragment(item: T, position: Int): Fragment
+
+    /**
+     * 获取fragment 对应 id
+     */
+    override fun getItemId(position: Int): Long {
+        if (position >= mData.size) return RecyclerView.NO_ID
+        return mFragmentIdMap[mData[position]] ?: return RecyclerView.NO_ID
+    }
+
+    /**
+     * 判断是否包含这个id的数
+     */
+    override fun containsItem(itemId: Long): Boolean {
+        return mFragmentIdMap.values.contains(itemId)
+    }
+
+    /**
+     * 设置新数据
+     */
+    fun setNewData(data: MutableList<T> = mutableListOf()) {
+        val oldData = copyData()
+        mData = data
+        diffNotifyDataSetChanged(oldData, mData)
+    }
+
+    /**
+     * 累加新数据
+     */
+    fun addNewData(data: MutableList<T> = mutableListOf()) {
+        val oldData = copyData()
+        mData.addAll(data)
+        //创建新的对应位置的id
+        createFragmentsIds(data)
+        diffNotifyDataSetChanged(oldData, mData)
+
+    }
+
+    /**
+     * 添加数据
+     */
+    fun addData(data: T) {
+        val oldData = copyData()
+        mData.add(data)
+        //随机一个id对应当前位置Fragment,两次随机确保同id率为最低概率
+        mFragmentIdMap[data] = Random.nextLong() - Random.nextInt()
+        diffNotifyDataSetChanged(oldData, mData)
+    }
+
+    /**
+     * 移除某个数据
+     */
+    fun removeData(data: T): Boolean {
+        val oldData = copyData()
+        if (mData.remove(data)) {
+            mFragmentIdMap.remove(data)
+            diffNotifyDataSetChanged(oldData, mData)
+            return true
+        }
+        return false
+    }
+
+    /**
+     * 移除某个位置的数据
+     */
+    fun removeData(position: Int): Boolean {
+        if (position < mData.size && position < mFragmentIdMap.size) {
+            val oldData = copyData()
+            val removeItem = mData.removeAt(position)
+            mFragmentIdMap.remove(removeItem)
+            diffNotifyDataSetChanged(oldData, mData)
+            return true
+        }
+        return false
+    }
+
+    /**
+     * 拷贝原数据
+     */
+    private fun copyData(): MutableList<T> {
+        val oldData = mutableListOf<T>()
+        oldData.addAll(mData)
+        return oldData
+    }
+
+    /**
+     * 使用diff工具更新UI,当前diff工具对比使用的方式是 [==] 所以如果需要精确对比不同item数据，可以重写[T]的[equals]方法.
+     */
+    private fun diffNotifyDataSetChanged(oldData: MutableList<T>, newData: MutableList<T>) {
+        DiffUtil.calculateDiff(object : DiffUtil.Callback() {
+
+            override fun getOldListSize(): Int = oldData.size
+
+            override fun getNewListSize(): Int = newData.size
+
+            override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean = oldData[oldItemPosition] == newData[newItemPosition]
+
+            override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean = oldData[oldItemPosition] == newData[newItemPosition]
+
+        }, true).dispatchUpdatesTo(this)
+    }
+
+
+    /**
+     * 创建[mData]对应Fragment的id
+     */
+    private fun createFragmentsIds(data: MutableList<T>) {
+        for (item in data) {
+            mFragmentIdMap[item] = Random.nextLong() - Random.nextInt()
+        }
+    }
+
+}
--- a/module_home/src/main/java/com/quyunshuo/module/home/activity/InternalPagerActivity.kt
+++ b/module_home/src/main/java/com/quyunshuo/module/home/activity/InternalPagerActivity.kt
@ -1,13 +1,16 @@
 package com.quyunshuo.module.home.activity

+import android.os.Bundle
 import androidx.activity.viewModels
 import androidx.fragment.app.Fragment
-import androidx.viewpager2.adapter.FragmentStateAdapter
+import androidx.fragment.app.FragmentActivity
 import com.quyunshuo.androidbaseframemvvm.base.mvvm.vm.EmptyViewModel
 import com.quyunshuo.androidbaseframemvvm.common.ui.BaseActivity
+import com.quyunshuo.androidbaseframemvvm.common.ui.BaseFragmentStateAdapter
 import com.quyunshuo.module.home.databinding.HomeActivityInternalLayoutBinding
 import com.quyunshuo.module.home.fragment.InternalFragment
 import dagger.hilt.android.AndroidEntryPoint
+import kotlin.random.Random

 /**
 * @author DBoy 2021/7/6 <p>
@ -18,28 +21,73 @@ class InternalPagerActivity : BaseActivity<HomeActivityInternalLayoutBinding, Em

    override val mViewModel: EmptyViewModel by viewModels()

+    private val mCreateFragmentData = mutableListOf<String>()
+
+    private var mAdapter: InternalPagerFragmentAdapter? = null
+
+
    override fun HomeActivityInternalLayoutBinding.initView() {
+        addFragment.setOnClickListener {
+            //添加一个随机页面
+            mAdapter?.addData("Pager ID:${Random.nextInt()}")
+        }
+        removeFragment.setOnClickListener {
+            //移除当前展示页面
+//            mAdapter?.removeData("更多")
+            mAdapter?.removeData(viewPager.currentItem)
+        }
        initPager()
    }

    private fun initPager() {
-        val fragments = mutableListOf<Fragment>(
-            InternalFragment(),
-            InternalFragment(),
-            InternalFragment(),
-            InternalFragment(),
-            InternalFragment(),
-            InternalFragment(),
-            InternalFragment()
-        )
-        mBinding.viewPager.adapter = object : FragmentStateAdapter(this) {
-            override fun getItemCount(): Int = fragments.size
-            override fun createFragment(position: Int): Fragment = fragments[position]
-        }
+        mCreateFragmentData.add("首页")
+        mCreateFragmentData.add("我的")
+        mCreateFragmentData.add("设置")
+        mCreateFragmentData.add("更多")
+        mCreateFragmentData.add("动态")
+        mAdapter = InternalPagerFragmentAdapter(this, mCreateFragmentData)
+        mBinding.viewPager.adapter = mAdapter

    }

    override fun initObserve() {}

    override fun initRequestData() {}
+
+    class InternalPagerFragmentAdapter(activity: FragmentActivity, data: MutableList<String> = mutableListOf()) :
+        BaseFragmentStateAdapter<String>(activity, data) {
+        override fun createFragment(item: String, position: Int): Fragment {
+            val bundle = Bundle().apply {
+                putString("What", item)
+            }
+            return when (item) {
+                "首页" -> {
+                    //假装首页
+                    InternalFragment()
+                }
+                "我的" -> {
+                    //假装我的
+                    InternalFragment()
+                }
+                "设置" -> {
+                    //假装设置
+                    InternalFragment()
+                }
+                "更多" -> {
+                    //假装更多
+                    InternalFragment()
+                }
+                else -> {
+                    //另外动态item创建类型
+                    InternalFragment()
+                }
+            }.apply {
+                //设置传递参数bundle
+                arguments = bundle
+            }
+        }
+
+
+    }
+
 }
--- a/module_home/src/main/java/com/quyunshuo/module/home/fragment/InternalFragment.kt
+++ b/module_home/src/main/java/com/quyunshuo/module/home/fragment/InternalFragment.kt
@ -1,6 +1,9 @@
 package com.quyunshuo.module.home.fragment

+import android.os.Bundle
+import android.util.Log
 import androidx.fragment.app.viewModels
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
 import com.quyunshuo.androidbaseframemvvm.common.ui.BaseFragment
 import com.quyunshuo.module.home.databinding.HomeFragmentInternalLayoutBinding
 import dagger.hilt.android.AndroidEntryPoint
@ -14,9 +17,26 @@ class InternalFragment : BaseFragment<HomeFragmentInternalLayoutBinding, Interna

    override val mViewModel by viewModels<InternalViewModel>()

+    /**
+     * 页面状态数据管理帮助类
+     */
+    private lateinit var mInternalFragmentStatusHelper: InternalFragmentStatusHelper
+
+    /***
+     * 注册帮助类
+     */
+    override fun onRegisterStatusHelper(): ViewStatusHelper? {
+        mInternalFragmentStatusHelper = InternalFragmentStatusHelper(super.onRegisterStatusHelper())
+        return mInternalFragmentStatusHelper
+    }
+
    override fun HomeFragmentInternalLayoutBinding.initView() {}

+
    override fun initObserve() {
+        mViewModel.increase(mInternalFragmentStatusHelper.rebuildSize)
+        val s = arguments?.getString("What") ?: ""
+        mBinding.toolBarTitle.text = s
        mViewModel.recreatedCont.observe(viewLifecycleOwner) {
            mBinding.recreateContTv.text = "重建次数 $it"
        }
@ -33,12 +53,33 @@ class InternalFragment : BaseFragment<HomeFragmentInternalLayoutBinding, Interna
    }

    override fun initRequestData() {
-        //每次重建都会累加数据
-        mViewModel.increase()
        //当页面重建的时候不再重新请求数据，且当前页面数据数据有且没有刷新逻辑的情况下不再请求数据。
        if (isRecreate() && mViewModel.firstData.value != null) {
            return
        }
        mViewModel.getData()
    }
+
+    /**
+     * 当前Fragment重建帮助类
+     */
+    internal class InternalFragmentStatusHelper(parentViewStatusHelper: ViewStatusHelper?) : ViewStatusHelper(parentViewStatusHelper) {
+        /**
+         * 重建次数
+         */
+        var rebuildSize = 0
+
+        private val KEY_REBUILD = "com.quyunshuo.module.home.fragment.InternalFragment.InternalFragmentStatusHelper.rebuild"
+
+        override fun onRestoreInstanceStatus(savedInstanceState: Bundle?) {
+            super.onRestoreInstanceStatus(savedInstanceState)
+            rebuildSize = (savedInstanceState?.getInt(KEY_REBUILD) ?: 0) + 1
+        }
+
+        override fun onSaveInstanceState(bundle: Bundle) {
+            super.onSaveInstanceState(bundle)
+            bundle.putInt(KEY_REBUILD, rebuildSize)
+        }
+    }
+
 }
--- a/module_home/src/main/java/com/quyunshuo/module/home/fragment/InternalViewModel.kt
+++ b/module_home/src/main/java/com/quyunshuo/module/home/fragment/InternalViewModel.kt
@ -4,6 +4,7 @@ import android.util.Log
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
 import com.quyunshuo.androidbaseframemvvm.base.mvvm.vm.BaseViewModel
+import com.quyunshuo.androidbaseframemvvm.base.utils.status.ViewStatusHelper
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
@ -15,12 +16,17 @@ import javax.inject.Inject

 /**
 * @author DBoy 2021/7/6 <p>
- * - 文件描述 :
+ * - 文件描述 : ViewModel再ViewPager2的Fragment中会随着Fragment执行[Fragment.onDestory]一同销毁。
+ * 所以一些需要长期保存的变量数据，不适合保存再ViewModel，考虑使用[ViewStatusHelper]保存页面上部分数据，
+ * 页面恢复的时候再交给ViewModel处理,例如[recreatedCont]
 */
@HiltViewModel
-class InternalViewModel @Inject constructor(private val repository: InternalRepository) :
+class InternalViewModel @Inject constructor() :
    BaseViewModel() {

+    @Inject
+    lateinit var repository: InternalRepository
+
    /**
     * 重建计数
     */
@ -34,9 +40,8 @@ class InternalViewModel @Inject constructor(private val repository: InternalRepo
    /**
     * 累加重建次数
     */
-    fun increase() {
-        val value = recreatedCont.value ?: 0
-        recreatedCont.value = value + 1
+    fun increase(size: Int) {
+        recreatedCont.value = size
    }

    /**
@ -57,8 +62,4 @@ class InternalViewModel @Inject constructor(private val repository: InternalRepo
        }
    }

-    override fun onCleared() {
-        super.onCleared()
-        Log.d("DJC", "InternalViewModel Clear")
-    }
 }
--- a/module_home/src/main/res/layout/home_activity_internal_layout.xml
+++ b/module_home/src/main/res/layout/home_activity_internal_layout.xml
@ -1,12 +1,45 @@
 <?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/viewPager"
+        app:layout_constraintBottom_toTopOf="@id/bottomAction"
+        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:layout_height="0dp" />
+
+
+    <androidx.appcompat.widget.LinearLayoutCompat
+        android:id="@+id/bottomAction"
+        android:layout_width="match_parent"
+        android:layout_height="44dp"
+        android:orientation="horizontal"
+        app:layout_constraintBottom_toBottomOf="parent">
+
+        <Button
+            android:id="@+id/removeFragment"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1"
+            android:shadowColor="#A82424"
+            android:text="删除当前Fragment"
+            android:textAllCaps="false"
+            android:translationZ="@dimen/dp_10" />
+
+        <Button
+            android:id="@+id/addFragment"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1"
+            android:shadowColor="#000"
+            android:text="添加一个新的Fragment"
+            android:textAllCaps="false"
+            android:translationZ="@dimen/dp_10" />
+
+    </androidx.appcompat.widget.LinearLayoutCompat>

 </androidx.constraintlayout.widget.ConstraintLayout>
--- a/module_home/src/main/res/layout/home_fragment_internal_layout.xml
+++ b/module_home/src/main/res/layout/home_fragment_internal_layout.xml
@ -1,18 +1,47 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.appcompat.widget.LinearLayoutCompat 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"
-    android:gravity="center"
+    android:background="#fff"
    android:orientation="vertical">


+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="46dp"
+        android:layout_gravity="top"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <TextView
+            android:id="@+id/toolBarTitle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="#262A30"
+            android:textSize="18sp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <View
+            app:layout_constraintBottom_toBottomOf="parent"
+            android:background="#D1D0D0"
+            android:layout_width="match_parent"
+            android:layout_height="1dp" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
    <TextView
        android:id="@+id/loadingStatusTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_marginTop="50dp"
        android:textColor="#333"
-        android:textSize="28sp"
+        android:textSize="20sp"
        tools:text="Loging" />


@ -20,6 +49,7 @@
        android:id="@+id/loadDataTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
+        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:textColor="#333"
        android:textSize="28sp"
@ -29,7 +59,8 @@
        android:id="@+id/recreateContTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
-        android:layout_marginTop="50dp"
+        android:layout_gravity="center"
+        android:layout_marginTop="20dp"
        android:textColor="#333"
        android:textSize="28sp"
        tools:text="重建计数" />