質問編集履歴
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内容編集
test
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test
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追記ViewModelにLiveDataを使用するように変更
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**追記ViewModelにLiveDataを使用するように、`AppState.kt`,`MainActivity.kt`,`ListActivity.kt`を変更**
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test
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test
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@@ -34,6 +34,12 @@
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### 該当のソースコード
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追記ViewModelにLiveDataを使用するように変更
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build.gradle
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```gradle
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```kotlin
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package com.
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package com.tomato_love.arrayvaluetest
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import androidx.lifecycle.MutableLiveData
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import androidx.lifecycle.ViewModel
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var array = arrayOf("one","two","three")
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var arrayIndex:Int = 0
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// var arrayIndex:Int = 0
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var arrayIndex: MutableLiveData<Int> = MutableLiveData(0)
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}
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```kotlin
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package com.
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package com.tomato_love.arrayvaluetest
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import android.widget.TextView
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import androidx.lifecycle.LifecycleOwner
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import androidx.lifecycle.Observer
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import androidx.lifecycle.ViewModelProvider
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class MainActivity : AppCompatActivity() {
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// text.text = appState.array[appState.arrayIndex]
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appState.arrayIndex.observe({ lifecycle }, {
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text.text = appState.array[it] })
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```
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```kotlin
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package com.
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package com.tomato_love.arrayvaluetest
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@@ -368,11 +394,19 @@
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when (item) {
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// "one" -> appState.arrayIndex = 0
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// "two" -> appState.arrayIndex = 1
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// "three" -> appState.arrayIndex = 2
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"one" -> appState.arrayIndex
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"one" -> appState.arrayIndex.postValue(0)
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"two" -> appState.arrayIndex
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"two" -> appState.arrayIndex.postValue(1)
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"three" -> appState.arrayIndex
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"three" -> appState.arrayIndex.postValue(2)
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}
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@@ -390,6 +424,8 @@
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```
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