更新责任链模式

app/src/main/java/com/phcbest/designpatterns/behaviorPattern/chainOfResponsibility/ChainOfResponsibilityDemo.kt

@@ -0,0 +1,14 @@
+package com.phcbest.designpatterns.behaviorPattern.chainOfResponsibility
+
+import android.content.Context
+
+object ChainOfResponsibilityDemo {
+    fun doChainOfResponsibility(context: Context) {
+        val dialogUnit1 = DialogUnit1()
+        val dialogUnit2 = DialogUnit2()
+        val dialogUnit3 = DialogUnit3()
+        dialogUnit1.setNextUnit(dialogUnit2)
+        dialogUnit2.setNextUnit(dialogUnit3)
+        dialogUnit1.handlerRequest(context)
+    }
+}

app/src/main/java/com/phcbest/designpatterns/behaviorPattern/chainOfResponsibility/DialogUnit1.kt

@@ -0,0 +1,24 @@
+package com.phcbest.designpatterns.behaviorPattern.chainOfResponsibility
+
+import android.app.AlertDialog
+import android.content.Context
+
+class DialogUnit1 : IChainOfResponsibilityHandler {
+
+    private var mNextHandler: IChainOfResponsibilityHandler? = null
+
+    override fun setNextUnit(handler: IChainOfResponsibilityHandler) {
+        mNextHandler = handler
+    }
+
+    override fun handlerRequest(context: Context) {
+        AlertDialog.Builder(context).setTitle("处理器1").setMessage("处理器1")
+            .setNegativeButton("处理") { dialog, which ->
+                mNextHandler?.handlerRequest(context)
+            }.setNeutralButton("取消处理") { dialog, which ->
+                return@setNeutralButton
+            }.show()
+    }
+
+
+}

app/src/main/java/com/phcbest/designpatterns/behaviorPattern/chainOfResponsibility/DialogUnit2.kt

@@ -0,0 +1,24 @@
+package com.phcbest.designpatterns.behaviorPattern.chainOfResponsibility
+
+import android.app.AlertDialog
+import android.content.Context
+
+class DialogUnit2 : IChainOfResponsibilityHandler {
+
+    private var mNextHandler: IChainOfResponsibilityHandler? = null
+
+    override fun setNextUnit(handler: IChainOfResponsibilityHandler) {
+        mNextHandler = handler
+    }
+
+    override fun handlerRequest(context: Context) {
+        AlertDialog.Builder(context).setTitle("处理器2").setMessage("处理器2")
+            .setNegativeButton("处理") { dialog, which ->
+                mNextHandler?.handlerRequest(context)
+            }.setNeutralButton("取消处理") { dialog, which ->
+                return@setNeutralButton
+            }.show()
+    }
+
+
+}

app/src/main/java/com/phcbest/designpatterns/behaviorPattern/chainOfResponsibility/DialogUnit3.kt

@@ -0,0 +1,24 @@
+package com.phcbest.designpatterns.behaviorPattern.chainOfResponsibility
+
+import android.app.AlertDialog
+import android.content.Context
+
+class DialogUnit3 : IChainOfResponsibilityHandler {
+
+    private var mNextHandler: IChainOfResponsibilityHandler? = null
+
+    override fun setNextUnit(handler: IChainOfResponsibilityHandler) {
+        mNextHandler = handler
+    }
+
+    override fun handlerRequest(context: Context) {
+        AlertDialog.Builder(context).setTitle("处理器3").setMessage("处理器3")
+            .setNegativeButton("处理") { dialog, which ->
+                mNextHandler?.handlerRequest(context)
+            }.setNeutralButton("取消处理") { dialog, which ->
+                return@setNeutralButton
+            }.show()
+    }
+
+
+}

app/src/main/java/com/phcbest/designpatterns/behaviorPattern/chainOfResponsibility/IChainOfResponsibilityHandler.kt

@@ -0,0 +1,8 @@
+package com.phcbest.designpatterns.behaviorPattern.chainOfResponsibility
+
+import android.content.Context
+
+interface IChainOfResponsibilityHandler {
+    fun setNextUnit(handler: IChainOfResponsibilityHandler)
+    fun handlerRequest(context: Context)
+}

app/src/main/java/com/phcbest/designpatterns/ui/dashboard/DashboardFragment.kt

@@ -4,17 +4,16 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.TextView
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModelProvider
+import com.phcbest.designpatterns.behaviorPattern.chainOfResponsibility.ChainOfResponsibilityDemo
 import com.phcbest.designpatterns.databinding.FragmentDashboardBinding
 
 class DashboardFragment : Fragment() {
 
     private var _binding: FragmentDashboardBinding? = null
 
-    // This property is only valid between onCreateView and
-    // onDestroyView.
+
     private val binding get() = _binding!!
 
     override fun onCreateView(
@@ -23,20 +22,25 @@ class DashboardFragment : Fragment() {
         savedInstanceState: Bundle?
     ): View {
         val dashboardViewModel =
-            ViewModelProvider(this).get(DashboardViewModel::class.java)
+            ViewModelProvider(this)[DashboardViewModel::class.java]
 
         _binding = FragmentDashboardBinding.inflate(inflater, container, false)
-        val root: View = binding.root
+        _binding?.btnChainOfResponsibility?.setOnClickListener(this::onClickListener)
 
-        val textView: TextView = binding.textDashboard
-        dashboardViewModel.text.observe(viewLifecycleOwner) {
-            textView.text = it
-        }
-        return root
+        return binding.root
     }
 
     override fun onDestroyView() {
         super.onDestroyView()
         _binding = null
     }
+
+    private fun onClickListener(view: View) {
+        when (view) {
+            binding.btnChainOfResponsibility -> {
+                ChainOfResponsibilityDemo.doChainOfResponsibility(requireContext())
+            }
+            else -> {}
+        }
+    }
 }

app/src/main/res/layout/fragment_dashboard.xml

@@ -1,22 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout 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=".ui.dashboard.DashboardFragment">
 
-    <TextView
-        android:id="@+id/text_dashboard"
+    <GridLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginStart="8dp"
-        android:layout_marginTop="8dp"
-        android:layout_marginEnd="8dp"
-        android:textAlignment="center"
-        android:textSize="20sp"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-</androidx.constraintlayout.widget.ConstraintLayout>
+        android:layout_height="match_parent"
+        android:columnCount="4">
+
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/btn_chain_of_responsibility"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_columnWeight="1"
+            android:text="责任链模式" />
+    </GridLayout>
+
+</FrameLayout>