質問編集履歴
2
onSaveInstanceState()について追記
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@@ -98,6 +98,22 @@
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https://stackoverflow.com/questions/44256250/does-viewmodel-survive-activity-save-and-restore
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> the ViewModel is destroyed if your process is killed by Android.
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システムによってキルされた場合、ViewModelさんも死んでしまうみたいですね。
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しかし、できれば `onSaveInstanceState()` を使いたくないのですよねぇ。
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ProviderをいじるなどのViewModelの管理方法をいじる程度で対処できればいいのですが、それが無理なのであれば、諦めますけど。
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### コード・出力結果
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1
コードの全体の掲載
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```Kotlin
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package sakana.tadano.androidsampleapp.views
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import android.app.Activity
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import android.content.Intent
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import android.os.Bundle
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import android.view.MenuItem
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import androidx.appcompat.app.AppCompatActivity
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import androidx.core.view.GravityCompat
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import androidx.lifecycle.Observer
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import androidx.lifecycle.ViewModelProvider
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import androidx.lifecycle.ViewModelProviders
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import kotlinx.android.synthetic.main.activity_main.*
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import sakana.tadano.androidsampleapp.R
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import sakana.tadano.androidsampleapp.viewmodels.Activity1ViewModel
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class Activity1 : AppCompatActivity() {
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init {
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println("Activity1::init")
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}
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val viewModel by lazy {
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val viewModel by lazy {
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ViewModelProviders.of(this@Activity1).get(Activity1ViewModel::class.java)
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ViewModelProviders.of(this@Activity1, ViewModelProvider.AndroidViewModelFactory(this.application)).get(Activity1ViewModel::class.java)
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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// xmlとコードを紐付ける。
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this.setContentView(R.layout.activity_main)
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// ボタンを押すと画面遷移をする。
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this.floatingActionButton.setOnClickListener { this.startActivity2() }
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println("Activity1.onCreate() | Activity1: ${this.hashCode()}, Activity1ViewModel: ${this.viewModel.hashCode()}")
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}
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override fun onDestroy() {
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println("Activity1.onDestroy()")
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super.onDestroy()
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}
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// Activity2を開始する。
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private fun startActivity2() {
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val intent = Intent(this, Activity2::class.java).also {
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it.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
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it.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY)
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it.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS)
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it.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
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it.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
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}
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this.startActivity(intent)
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}
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}
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@@ -114,24 +216,6 @@
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```Kotlin
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118
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-
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override fun onCreate() {
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// その他の処理
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println("Activity1.onCreate() | Activity1: ${this.hashCode()}, Activity1ViewModel: ${this.viewModel.hashCode()}")
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}
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```
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-
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-
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-
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```
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// 1. "Don't keep activities" が無効なとき:
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