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fragment3 でテキストを入力して ViewModel に保存し fragment1 で表示するようにしてみました

2021/07/20 12:17

投稿

jimbe

スコア13209

test CHANGED Viewed

@@ -122,6 +122,10 @@
   val func1_mode = MutableLiveData<Int>(1)
+  val func1_text = MutableLiveData<String>("dummy")
 }
 ```
@@ -178,6 +182,12 @@
     }
+    viewModel.func1_text.observe(viewLifecycleOwner) { text ->
+      func1_text.text = text
+    }
   }
 }
@@ -232,6 +242,10 @@
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import kotlinx.android.synthetic.main.fragment3.*
 class Fragment3 : Fragment() {
@@ -248,6 +262,28 @@
   }
+  private val viewModel: SampleViewModel by activityViewModels()
+  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+    super.onViewCreated(view, savedInstanceState)
+    second_button.setOnClickListener {
+      viewModel.func1_text.value = func1_edit.text.toString()
+      viewModel.func1_mode.value = 1
+    }
+  }
 }
 ```
@@ -370,6 +406,8 @@
     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"
@@ -378,23 +416,85 @@
     tools:context=".Fragment1">
   <Button
+      android:id="@+id/first_button"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
       android:text="to Fragment3"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/func1_text" />
+  <TextView
-      android:id="@+id/first_button"
+      android:id="@+id/func1_text"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:layout_marginStart="16dp"
+      android:layout_marginEnd="16dp"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>
+```
+fragment2.xml
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Fragment2">
+  <TextView
       android:layout_width="match_parent"
       android:layout_height="match_parent"
-      />
+      android:text="Fragment2" />
 </androidx.constraintlayout.widget.ConstraintLayout>
 ```
-fragment2.xml
+fragment3.xml
 ```xml
@@ -404,27 +504,79 @@
     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=".Fragment2">
+    tools:context=".Fragment3">
+  <EditText
+      android:id="@+id/func1_edit"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:layout_marginStart="16dp"
+      android:layout_marginEnd="16dp"
+      android:ems="10"
+      android:text="Fragment3"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent" />
+  <Button
+      android:id="@+id/second_button"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:text="set Text"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/func1_edit" />
   <TextView
+      android:id="@+id/textView"
-      android:layout_width="match_parent"
+      android:layout_width="wrap_content"
-      android:layout_height="match_parent"
+      android:layout_height="wrap_content"
-      android:text="Fragment2" />
+      android:text="Input Text:"
+      app:layout_constraintStart_toStartOf="@id/func1_edit"
+      app:layout_constraintBottom_toTopOf="@id/func1_edit" />
 </androidx.constraintlayout.widget.ConstraintLayout>
 ```
-fragment3.xml
+fragment4.xml
 ```xml
@@ -440,40 +592,10 @@
     android:layout_height="match_parent"
+    android:id="@+id/function1_container"
-    tools:context=".Fragment3">
+    tools:context=".Fragment4">
-  <TextView
-      android:layout_width="match_parent"
-      android:layout_height="match_parent"
-      android:text="Fragment3" />
 </androidx.constraintlayout.widget.ConstraintLayout>
 ```
-fragment4.xml
-```xml
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:id="@+id/function1_container"
-    tools:context=".Fragment4">
-</androidx.constraintlayout.widget.ConstraintLayout>
-```