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/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" />