回答編集履歴
1
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
answer
CHANGED
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@@ -60,6 +60,8 @@
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60
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class SampleViewModel : ViewModel() {
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val func1_mode = MutableLiveData<Int>(1)
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63
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+
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64
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+
val func1_text = MutableLiveData<String>("dummy")
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}
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```
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65
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Fragment1.kt
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@@ -88,6 +90,9 @@
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first_button.setOnClickListener {
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viewModel.func1_mode.value = 3
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}
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93
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+
viewModel.func1_text.observe(viewLifecycleOwner) { text ->
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func1_text.text = text
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}
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}
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}
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```
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@@ -115,6 +120,8 @@
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import android.view.View
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import android.view.ViewGroup
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import androidx.fragment.app.Fragment
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123
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+
import androidx.fragment.app.activityViewModels
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+
import kotlinx.android.synthetic.main.fragment3.*
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class Fragment3 : Fragment() {
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override fun onCreateView(
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@@ -123,6 +130,17 @@
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): View? {
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return inflater.inflate(R.layout.fragment3, container, false)
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}
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+
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private val viewModel: SampleViewModel by activityViewModels()
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override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
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137
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super.onViewCreated(view, savedInstanceState)
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138
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second_button.setOnClickListener {
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viewModel.func1_text.value = func1_edit.text.toString()
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viewModel.func1_mode.value = 1
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}
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}
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}
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```
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Fragment4.kt
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@@ -184,16 +202,33 @@
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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+
xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context=".Fragment1">
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+
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<Button
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android:id="@+id/first_button"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="to Fragment3"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/func1_text" />
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+
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<TextView
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-
android:id="@+id/
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android:id="@+id/func1_text"
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-
android:layout_width="
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+
android:layout_width="0dp"
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-
android:layout_height="
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android:layout_height="wrap_content"
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android:layout_marginStart="16dp"
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-
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android:layout_marginEnd="16dp"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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+
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</androidx.constraintlayout.widget.ConstraintLayout>
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```
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fragment2.xml
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@@ -216,14 +251,40 @@
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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+
xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context=".Fragment3">
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+
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<EditText
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android:id="@+id/func1_edit"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginStart="16dp"
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+
android:layout_marginEnd="16dp"
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android:ems="10"
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android:text="Fragment3"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<Button
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android:id="@+id/second_button"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="set Text"
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+
app:layout_constraintBottom_toBottomOf="parent"
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+
app:layout_constraintEnd_toEndOf="parent"
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+
app:layout_constraintStart_toStartOf="parent"
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+
app:layout_constraintTop_toBottomOf="@id/func1_edit" />
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<TextView
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android:id="@+id/textView"
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224
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-
android:layout_width="
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+
android:layout_width="wrap_content"
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225
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-
android:layout_height="
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+
android:layout_height="wrap_content"
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226
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-
android:text="
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285
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+
android:text="Input Text:"
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+
app:layout_constraintStart_toStartOf="@id/func1_edit"
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+
app:layout_constraintBottom_toTopOf="@id/func1_edit" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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```
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fragment4.xml
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