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

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

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

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
+    }
+
+}

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
+    }
+
+}

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)
-    }
-
-}

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)
+    }
+}

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)
+    }
+
+}