Android-Developer-Basic · Evil-Di · May 1, 2025
diff --git a/app/build.gradle b/app/build.gradle
@@ -3,12 +3,8 @@ plugins {
     id 'org.jetbrains.kotlin.android'
 }
 
-kotlin {
-    jvmToolchain(17)
-}
-
 android {
-    compileSdk 34
+    compileSdk 35
     namespace "otus.gpb.homework.fragments"
 
     defaultConfig {
@@ -34,15 +30,20 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 dependencies {
 
-    implementation 'androidx.core:core-ktx:1.7.0'
-    implementation 'androidx.appcompat:appcompat:1.5.1'
-    implementation 'com.google.android.material:material:1.6.1'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.core:core-ktx:1.16.0'
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.2.1'
+    implementation 'androidx.fragment:fragment-ktx:1.8.6'
     testImplementation 'junit:junit:4.13.2'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
 }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
@@ -21,6 +21,14 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ActivityA"
+            android:label="Activity A"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityB"
+            android:label="Activity B"
+            android:exported="false" />
     </application>
 
 </manifest>
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
@@ -0,0 +1,20 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+
+    private lateinit var fragmentA: FragmentA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+        if (savedInstanceState == null) {
+            fragmentA = FragmentA()
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.activity_a_container, fragmentA)
+                .commit()
+        }
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,42 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityB : AppCompatActivity() {
+    private val saveColor = "saveColor"
+    private var baColor: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_b)
+
+        if (savedInstanceState != null) {
+            baColor = savedInstanceState.getInt(saveColor)
+        }
+
+        val fba = FragmentBA()
+
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.activity_ba_container, fba)
+                .replace(R.id.activity_bb_container, FragmentBB())
+                .commit()
+        } else {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.activity_b_container, fba)
+                .commit()
+        }
+
+        fba.sendColor(baColor)
+        supportFragmentManager.observeColor(this) {color ->
+            baColor = color
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putInt(saveColor, baColor)
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,50 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import otus.gpb.homework.fragments.ColorGenerator.generateColor
+
+class FragmentA : Fragment() {
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 0) {
+                    childFragmentManager.popBackStack()
+                } else {
+                    isEnabled = false
+                    @Suppress("DEPRECATION")
+                    requireActivity().onBackPressed()
+                }
+            }
+        }
+
+        requireActivity().onBackPressedDispatcher.addCallback(callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<Button>(R.id.open_fragment_aa).setOnClickListener {
+
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_a_container, FragmentAA.newInstance(generateColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,50 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import otus.gpb.homework.fragments.ColorGenerator.generateColor
+
+private const val SET_COLOR = "setColor"
+
+open class FragmentAA : Fragment() {
+    private var color: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(SET_COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        return inflater.inflate(R.layout.fragment_aa, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(color)
+        view.findViewById<Button>(R.id.open_fragment_ab).setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragment_a_container, FragmentAB.newInstance(generateColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(SET_COLOR, color)
+                }
+            }
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,43 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+
+private const val SET_COLOR = "setColor"
+
+class FragmentAB : Fragment() {
+    private var color: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(SET_COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ab, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(color)
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAB().apply {
+                arguments = Bundle().apply {
+                    putInt(SET_COLOR, color)
+                }
+            }
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,38 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.core.view.isVisible
+import androidx.fragment.app.Fragment
+
+class FragmentBA: Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ba, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        applyColor {
+            c->view.setBackgroundColor(c)
+        }
+
+        val openBB = view.findViewById<Button>(R.id.open_fragment_bb)
+        openBB?.isVisible =
+            resources.configuration.orientation != Configuration.ORIENTATION_LANDSCAPE
+
+        openBB.setOnClickListener{
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.activity_b_container, FragmentBB())
+                .commit()
+        }
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,31 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.ColorGenerator.generateColor
+
+class FragmentBB: Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_bb, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<Button>(R.id.send_color).setOnClickListener {
+            if (resources.configuration.orientation != Configuration.ORIENTATION_LANDSCAPE) {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.activity_b_container, FragmentBA())
+                    .commit()
+            }
+            sendColor(generateColor())
+        }
+    }
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentResult.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentResult.kt
@@ -0,0 +1,29 @@
+package otus.gpb.homework.fragments
+
+import androidx.core.os.bundleOf
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.setFragmentResult
+import androidx.fragment.app.setFragmentResultListener
+import androidx.lifecycle.LifecycleOwner
+
+private const val F_RESULT_KEY = "fResult"
+private const val FM_RESULT_KEY = "fmResult"
+private const val COLOR_KEY = "color"
+
+fun Fragment.sendColor(color: Int) {
+    setFragmentResult(F_RESULT_KEY, bundleOf(COLOR_KEY to color))
+    setFragmentResult(FM_RESULT_KEY, bundleOf(COLOR_KEY to color))
+}
+
+fun Fragment.applyColor(callback: (Int)->Unit) {
+    setFragmentResultListener(F_RESULT_KEY) { _, bundle ->
+        callback(bundle.getInt(COLOR_KEY, 0))
+    }
+}
+
+fun FragmentManager.observeColor(lifecycleOwner: LifecycleOwner, callback: (Int)->Unit) {
+    setFragmentResultListener(FM_RESULT_KEY, lifecycleOwner) {_, bundle ->
+        callback(bundle.getInt(COLOR_KEY, 0))
+    }
+}