質問編集履歴
1
問題②のエラーが消えたのでエラー内容は削除しました。また、コメントを受けて試したことを追記しました。
test
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### ②個別のアクティビティを指定する（今回の場合は画面遷移）`SubActivity.kt`について
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### ②個別のアクティビティを指定する（今回の場合は画面遷移）`SubActivity.kt`について
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2-1. `AndroidManifest.xml`でフラグメントと組み合わせる場合は、現在の書き方で正しいのかどうか
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2-2. `SubActivity.kt`という名称で現在の階層構造のように`ui`フォルダ下の各フラグメントのファイルにおいていいのか
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エラーは出ていないが、似たようなことをやっているコードを見たことがないため、参考になる記事などがあれば教えていただきたいです。
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## 該当のソースコード
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フラグメントに組み込みたいMainActivity.kt
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```kotlin
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package your.package.name
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import androidx.appcompat.app.AppCompatActivity
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import android.os.Bundle
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import android.content.Intent
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import kotlinx.android.synthetic.main.activity_main.*
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class MainActivity : AppCompatActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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sendButton.setOnClickListener {
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val intent = Intent(application, SubActivity::class.java)
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startActivity(intent)
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}
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}
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}
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```
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```
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DashboardFragment.kt
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```Kotlin
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package com.example.fragact.ui.dashboard
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import android.widget.TextView
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import androidx.fragment.app.Fragment
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import androidx.lifecycle.Observer
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import androidx.lifecycle.ViewModelProviders
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import com.example.fragact.R
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class DashboardFragment : Fragment() {
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private lateinit var dashboardViewModel: DashboardViewModel
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override fun onCreateView(
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inflater: LayoutInflater,
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container: ViewGroup?,
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savedInstanceState: Bundle?
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): View? {
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dashboardViewModel =
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ViewModelProviders.of(this).get(DashboardViewModel::class.java)
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val root = inflater.inflate(R.layout.fragment_dashboard, container, false)
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val textView: TextView = root.findViewById(R.id.text_dashboard)
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dashboardViewModel.text.observe(this, Observer {
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textView.text = it
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})
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return root
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}
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}
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```
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DashboardViewModel.kt
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```kotlin
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package com.example.fragact.ui.dashboard
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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import androidx.lifecycle.ViewModel
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class DashboardViewModel : ViewModel() {
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private val _text = MutableLiveData<String>().apply {
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value = "This is dashboard Fragment"
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}
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val text: LiveData<String> = _text
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}
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```
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`app/java/com.example.fracact/ui/dashboard/`
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SubActivity.kt
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```
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package com.example.fragact.ui.dashboard
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import androidx.appcompat.app.AppCompatActivity
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import android.os.Bundle
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import kotlinx.android.synthetic.main.activity_sub.*
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class SubActivity : AppCompatActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_sub)
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returnButton.setOnClickListener{
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finish()
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}
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}
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}
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```
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AndroidManifest.xml
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.example.fragact">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity
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android:name=".MainActivity"
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android:label="@string/app_name">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<activity
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android:name=".SubActivity"
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android:label="@string/app_name" >
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</activity>
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```
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```
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</application>
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</manifest>
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```
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## 試したこと
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329
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`DashboardFragment.kt`などアクティビティに関わるプログラムを変更せず、layoutだけ変更した場合、アクティビティなしの遷移前の画面は表示することができました。
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fragment_dashboard.xml
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout 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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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<TextView
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android:id="@+id/text_dashboard"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:layout_marginStart="8dp"
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android:layout_marginTop="8dp"
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android:layout_marginEnd="8dp"
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android:textAlignment="center"
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android:textSize="20sp"
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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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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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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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android:orientation="vertical"
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android:gravity="center"
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android:background="#dfe"
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tools:context=".MainActivity">
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<TextView
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android:text="@string/main"
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android:textSize="30sp"
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android:layout_margin="10dp"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content" />
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404
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407
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<Button
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android:id="@+id/sendButton"
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android:text="@string/move"
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android:textSize="30sp"
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414
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+
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android:layout_margin="20dp"
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416
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+
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417
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+
android:layout_width="wrap_content"
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418
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+
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419
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android:layout_height="wrap_content" />
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|
420
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+
|
|
421
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+
|
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422
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|
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423
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</LinearLayout>
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|
+
</androidx.constraintlayout.widget.ConstraintLayout>
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|
+
|
|
431
|
+
```
|
|
432
|
+
|
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433
|
+
|
|
434
|
+
|
|
435
|
+
## コメントを受けて試したこと
|
|
436
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+
|
|
437
|
+
|
|
438
|
+
|
|
439
|
+
app/java/com.example.fragact/MainActivityに組み込みたいMainActivity.ktの内容を追記してみました。
|
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|
+
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+
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+
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443
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+
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444
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|
+
MainActivity
|
|
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|
+
|
|
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+
```
|
|
448
|
+
|
|
449
|
+
package com.example.fragact
|
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+
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|
451
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452
|
+
|
|
453
|
+
import android.os.Bundle
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454
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455
|
+
import com.google.android.material.bottomnavigation.BottomNavigationView
|
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86
456
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87
457
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import androidx.appcompat.app.AppCompatActivity
|
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88
458
|
|
|
89
|
-
import android.o
|
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459
|
+
import androidx.navigation.findNavController
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460
|
+
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461
|
+
import androidx.navigation.ui.AppBarConfiguration
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462
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+
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463
|
+
import androidx.navigation.ui.setupActionBarWithNavController
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import androidx.navigation.ui.setupWithNavController
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import android.content.Intent
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import kotlinx.android.synthetic.main.activity_main.*
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95
|
-
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+
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class MainActivity : AppCompatActivity() {
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|
-
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+
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476
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101
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override fun onCreate(savedInstanceState: Bundle?) {
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@@ -104,343 +480,99 @@
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105
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|
setContentView(R.layout.activity_main)
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107
|
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|
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val navView: BottomNavigationView = findViewById(R.id.nav_view)
|
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|
+
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|
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|
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|
|
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|
+
val navController = findNavController(R.id.nav_host_fragment)
|
|
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|
+
|
|
489
|
+
// Passing each menu ID as a set of Ids because each
|
|
490
|
+
|
|
491
|
+
// menu should be considered as top level destinations.
|
|
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|
+
|
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|
+
val appBarConfiguration = AppBarConfiguration(
|
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|
+
|
|
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|
+
setOf(
|
|
496
|
+
|
|
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|
+
R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications
|
|
498
|
+
|
|
499
|
+
)
|
|
500
|
+
|
|
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|
+
)
|
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|
+
|
|
503
|
+
setupActionBarWithNavController(navController, appBarConfiguration)
|
|
504
|
+
|
|
505
|
+
navView.setupWithNavController(navController)
|
|
506
|
+
|
|
507
|
+
|
|
508
|
+
|
|
509
|
+
|
|
108
510
|
|
|
109
511
|
sendButton.setOnClickListener {
|
|
110
512
|
|
|
111
|
-
|
|
513
|
+
val intent = Intent(application, SubActivity::class.java)
|
|
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|
-
|
|
514
|
+
|
|
113
|
-
|
|
515
|
+
startActivity(intent)
|
|
114
516
|
|
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115
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|
}
|
|
116
518
|
|
|
117
519
|
}
|
|
118
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|
|
|
521
|
+
|
|
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|
+
|
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119
523
|
}
|
|
120
524
|
|
|
121
525
|
```
|
|
122
526
|
|
|
123
527
|
|
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124
528
|
|
|
125
|
-
DashboardFragment.kt
|
|
126
|
-
|
|
127
|
-
```Kotlin
|
|
128
|
-
|
|
129
|
-
package com.example.fragact.ui.dashboard
|
|
130
|
-
|
|
131
|
-
|
|
132
|
-
|
|
133
|
-
import android.os.Bundle
|
|
134
|
-
|
|
135
|
-
import android.view.LayoutInflater
|
|
136
|
-
|
|
137
|
-
import android.view.View
|
|
138
|
-
|
|
139
|
-
import android.view.ViewGroup
|
|
140
|
-
|
|
141
|
-
import android.widget.TextView
|
|
142
|
-
|
|
143
|
-
import androidx.fragment.app.Fragment
|
|
144
|
-
|
|
145
|
-
import androidx.lifecycle.Observer
|
|
146
|
-
|
|
147
|
-
import androidx.lifecycle.ViewModelProviders
|
|
148
|
-
|
|
149
|
-
import com.example.fragact.R
|
|
150
|
-
|
|
151
|
-
|
|
152
|
-
|
|
153
|
-
class DashboardFragment : Fragment() {
|
|
154
|
-
|
|
155
|
-
|
|
156
|
-
|
|
157
|
-
private lateinit var dashboardViewModel: DashboardViewModel
|
|
158
|
-
|
|
159
|
-
|
|
160
|
-
|
|
161
|
-
override fun onCreateView(
|
|
162
|
-
|
|
163
|
-
inflater: LayoutInflater,
|
|
164
|
-
|
|
165
|
-
container: ViewGroup?,
|
|
166
|
-
|
|
167
|
-
savedInstanceState: Bundle?
|
|
168
|
-
|
|
169
|
-
): View? {
|
|
170
|
-
|
|
171
|
-
dashboardViewModel =
|
|
172
|
-
|
|
173
|
-
ViewModelProviders.of(this).get(DashboardViewModel::class.java)
|
|
174
|
-
|
|
175
|
-
val root = inflater.inflate(R.layout.fragment_dashboard, container, false)
|
|
176
|
-
|
|
177
|
-
val textView: TextView = root.findViewById(R.id.text_dashboard)
|
|
178
|
-
|
|
179
|
-
dashboardViewModel.text.observe(this, Observer {
|
|
180
|
-
|
|
181
|
-
textView.text = it
|
|
182
|
-
|
|
183
|
-
|
|
529
|
+
しかし、
|
|
184
|
-
|
|
185
|
-
|
|
530
|
+
|
|
186
|
-
|
|
187
|
-
}
|
|
188
|
-
|
|
189
|
-
}
|
|
190
|
-
|
|
191
|
-
```
|
|
531
|
+
```
|
|
192
|
-
|
|
193
|
-
|
|
532
|
+
|
|
194
|
-
|
|
195
|
-
```kotlin
|
|
196
|
-
|
|
197
|
-
package com.example.fragact.ui.dashboard
|
|
198
|
-
|
|
199
|
-
|
|
200
|
-
|
|
201
|
-
import androidx.lifecycle.LiveData
|
|
202
|
-
|
|
203
|
-
import androidx.lifecycle.MutableLiveData
|
|
204
|
-
|
|
205
|
-
import androidx.lifecycle.ViewModel
|
|
206
|
-
|
|
207
|
-
|
|
208
|
-
|
|
209
|
-
class DashboardViewModel : ViewModel() {
|
|
210
|
-
|
|
211
|
-
|
|
212
|
-
|
|
213
|
-
private val _text = MutableLiveData<String>().apply {
|
|
214
|
-
|
|
215
|
-
value = "This is dashboard Fragment"
|
|
216
|
-
|
|
217
|
-
}
|
|
218
|
-
|
|
219
|
-
val text: LiveData<String> = _text
|
|
220
|
-
|
|
221
|
-
}
|
|
222
|
-
|
|
223
|
-
```
|
|
224
|
-
|
|
225
|
-
|
|
226
|
-
|
|
227
|
-
`app/java/com.example.fracact/ui/dashboard/`
|
|
228
|
-
|
|
229
|
-
SubActivity.kt
|
|
230
|
-
|
|
231
|
-
```
|
|
232
|
-
|
|
233
|
-
package com.example.fragact.ui.dashboard
|
|
234
|
-
|
|
235
|
-
|
|
236
|
-
|
|
237
|
-
import androidx.appcompat.app.AppCompatActivity
|
|
238
|
-
|
|
239
|
-
import android.os.Bundle
|
|
240
|
-
|
|
241
|
-
import kotlinx.android.synthetic.main.activity_sub.*
|
|
242
|
-
|
|
243
|
-
|
|
244
|
-
|
|
245
|
-
class SubActivity : AppCompatActivity() {
|
|
246
|
-
|
|
247
|
-
|
|
248
|
-
|
|
249
|
-
override fun onCreate(savedInstanceState: Bundle?) {
|
|
250
|
-
|
|
251
|
-
super.onCreate(savedInstanceState)
|
|
252
|
-
|
|
253
|
-
setContentView(R.layout.activity_sub)
|
|
254
|
-
|
|
255
|
-
|
|
256
|
-
|
|
257
|
-
|
|
533
|
+
sendButton.setOnClickListener {
|
|
534
|
+
|
|
258
|
-
|
|
535
|
+
val intent = Intent(application, SubActivity::class.java)
|
|
536
|
+
|
|
259
|
-
|
|
537
|
+
startActivity(intent)
|
|
260
538
|
|
|
261
539
|
}
|
|
262
540
|
|
|
263
|
-
|
|
264
|
-
|
|
265
|
-
|
|
266
|
-
|
|
267
|
-
|
|
268
|
-
|
|
269
|
-
|
|
270
|
-
|
|
271
|
-
|
|
272
|
-
|
|
273
|
-
|
|
274
|
-
|
|
275
|
-
|
|
276
|
-
|
|
277
|
-
|
|
278
|
-
|
|
279
|
-
|
|
280
|
-
|
|
281
|
-
|
|
282
|
-
|
|
283
|
-
|
|
284
|
-
|
|
285
|
-
|
|
286
|
-
|
|
287
|
-
|
|
288
|
-
|
|
289
|
-
|
|
290
|
-
|
|
291
|
-
|
|
292
|
-
|
|
293
|
-
|
|
294
|
-
|
|
295
|
-
|
|
296
|
-
|
|
297
|
-
|
|
298
|
-
|
|
299
|
-
<activity
|
|
300
|
-
|
|
301
|
-
android:name=".MainActivity"
|
|
302
|
-
|
|
303
|
-
android:label="@string/app_name">
|
|
304
|
-
|
|
305
|
-
<intent-filter>
|
|
306
|
-
|
|
307
|
-
<action android:name="android.intent.action.MAIN" />
|
|
308
|
-
|
|
309
|
-
|
|
310
|
-
|
|
311
|
-
<category android:name="android.intent.category.LAUNCHER" />
|
|
312
|
-
|
|
313
|
-
</intent-filter>
|
|
314
|
-
|
|
315
|
-
</activity>
|
|
316
|
-
|
|
317
|
-
<activity
|
|
318
|
-
|
|
319
|
-
android:name=".SubActivity"
|
|
320
|
-
|
|
321
|
-
android:label="@string/app_name" >
|
|
322
|
-
|
|
323
|
-
</activity>
|
|
324
|
-
|
|
325
|
-
</application>
|
|
326
|
-
|
|
327
|
-
|
|
328
|
-
|
|
329
|
-
</manifest>
|
|
330
|
-
|
|
331
|
-
```
|
|
332
|
-
|
|
333
|
-
|
|
334
|
-
|
|
335
|
-
|
|
336
|
-
|
|
337
|
-
|
|
338
|
-
|
|
339
|
-
## 試したこと
|
|
340
|
-
|
|
341
|
-
`DashboardFragment.kt`などアクティビティに関わるプログラムを変更せず、layoutだけ変更した場合、アクティビティなしの遷移前の画面は表示することができました。
|
|
342
|
-
|
|
343
|
-
|
|
344
|
-
|
|
345
|
-
fragment_dashboard.xml
|
|
346
|
-
|
|
347
|
-
```xml
|
|
348
|
-
|
|
349
|
-
<?xml version="1.0" encoding="utf-8"?>
|
|
350
|
-
|
|
351
|
-
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
|
|
352
|
-
|
|
353
|
-
xmlns:app="http://schemas.android.com/apk/res-auto"
|
|
354
|
-
|
|
355
|
-
android:layout_width="match_parent"
|
|
356
|
-
|
|
357
|
-
android:layout_height="match_parent">
|
|
358
|
-
|
|
359
|
-
|
|
360
|
-
|
|
361
|
-
<TextView
|
|
362
|
-
|
|
363
|
-
android:id="@+id/text_dashboard"
|
|
364
|
-
|
|
365
|
-
android:layout_width="match_parent"
|
|
366
|
-
|
|
367
|
-
android:layout_height="wrap_content"
|
|
368
|
-
|
|
369
|
-
android:layout_marginStart="8dp"
|
|
370
|
-
|
|
371
|
-
android:layout_marginTop="8dp"
|
|
372
|
-
|
|
373
|
-
android:layout_marginEnd="8dp"
|
|
374
|
-
|
|
375
|
-
android:textAlignment="center"
|
|
376
|
-
|
|
377
|
-
android:textSize="20sp"
|
|
378
|
-
|
|
379
|
-
app:layout_constraintEnd_toEndOf="parent"
|
|
380
|
-
|
|
381
|
-
app:layout_constraintStart_toStartOf="parent"
|
|
382
|
-
|
|
383
|
-
app:layout_constraintTop_toTopOf="parent" />
|
|
384
|
-
|
|
385
|
-
|
|
386
|
-
|
|
387
|
-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
|
|
388
|
-
|
|
389
|
-
xmlns:tools="http://schemas.android.com/tools"
|
|
390
|
-
|
|
391
|
-
android:layout_width="match_parent"
|
|
392
|
-
|
|
393
|
-
android:layout_height="match_parent"
|
|
394
|
-
|
|
395
|
-
android:orientation="vertical"
|
|
396
|
-
|
|
397
|
-
android:gravity="center"
|
|
398
|
-
|
|
399
|
-
android:background="#dfe"
|
|
400
|
-
|
|
401
|
-
tools:context=".MainActivity">
|
|
402
|
-
|
|
403
|
-
|
|
404
|
-
|
|
405
|
-
<TextView
|
|
406
|
-
|
|
407
|
-
android:text="@string/main"
|
|
408
|
-
|
|
409
|
-
android:textSize="30sp"
|
|
410
|
-
|
|
411
|
-
android:layout_margin="10dp"
|
|
412
|
-
|
|
413
|
-
android:layout_width="wrap_content"
|
|
414
|
-
|
|
415
|
-
android:layout_height="wrap_content" />
|
|
416
|
-
|
|
417
|
-
|
|
418
|
-
|
|
419
|
-
<Button
|
|
420
|
-
|
|
421
|
-
android:id="@+id/sendButton"
|
|
422
|
-
|
|
423
|
-
android:text="@string/move"
|
|
424
|
-
|
|
425
|
-
android:textSize="30sp"
|
|
426
|
-
|
|
427
|
-
android:layout_margin="20dp"
|
|
428
|
-
|
|
429
|
-
android:layout_width="wrap_content"
|
|
430
|
-
|
|
431
|
-
android:layout_height="wrap_content" />
|
|
432
|
-
|
|
433
|
-
|
|
434
|
-
|
|
435
|
-
</LinearLayout>
|
|
436
|
-
|
|
437
|
-
|
|
438
|
-
|
|
439
|
-
|
|
440
|
-
|
|
441
|
-
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
442
|
-
|
|
443
|
-
```
|
|
541
|
+
```
|
|
542
|
+
|
|
543
|
+
で`sendButton`が`Unresolved reference`となります。
|
|
544
|
+
|
|
545
|
+
|
|
546
|
+
|
|
547
|
+
layoutのactivity_main.xmlではなく、fragment_dashboard.xmlで「sendButton」を定義していることも原因かと考えられますが、フラグメントごとにアクティビティやレイアウトを設定するには他に方法がわからない状態です。
|
|
548
|
+
|
|
549
|
+
|
|
550
|
+
|
|
551
|
+
```
|
|
552
|
+
|
|
553
|
+
<Button
|
|
554
|
+
|
|
555
|
+
android:id="@+id/sendButton"
|
|
556
|
+
|
|
557
|
+
android:text="@string/move"
|
|
558
|
+
|
|
559
|
+
android:textSize="30sp"
|
|
560
|
+
|
|
561
|
+
android:layout_margin="20dp"
|
|
562
|
+
|
|
563
|
+
android:layout_width="wrap_content"
|
|
564
|
+
|
|
565
|
+
android:layout_height="wrap_content" />
|
|
566
|
+
|
|
567
|
+
```
|
|
568
|
+
|
|
569
|
+
|
|
570
|
+
|
|
571
|
+
|
|
572
|
+
|
|
573
|
+
|
|
574
|
+
|
|
575
|
+
|
|
444
576
|
|
|
445
577
|
|
|
446
578
|
|