回答編集履歴
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@@ -1,4 +1,60 @@
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それは synthetic import という機能でしたが、残念ながら最近廃止になってしまいました。
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代わりに findViewById または [view binding](https://developer.android.com/topic/libraries/view-binding?hl=ja) をお使いください。
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参考: [Kotlin Android Extensions syntheticsのdeprecatedに伴う対応 - Qiita](https://qiita.com/taigen/items/116ff3856eab6634e47b)
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参考: [https://teratail.com/questions/330555#reply-456902](https://teratail.com/questions/330555#reply-456902)
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参考: [https://teratail.com/questions/330555#reply-456902](https://teratail.com/questions/330555#reply-456902)
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---
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### findViewById の場合
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```diff
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+ val hitText = findViewById<TextView>(R.id.hitText)
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hitText.text = getString(R.string.hit_text)
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+ val loseText = findViewById<TextView>(R.id.loseText)
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loseText.text = getString(R.string.lose_text)
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```
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---
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### view binding の場合
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app/build.gradle の android { 〜 } に viewBinding を追加
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```diff
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android {
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// 略
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+ viewBinding {
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+ enabled = true
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+ }
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}
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```
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MainActivity.kt を修正
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```diff
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-import **kotlinx**.android.synthetic.main.activity_main.*
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+import com.example.highandlow.databinding.ActivityMainBinding
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class MainActivity : AppCompatActivity() {
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+ private lateinit var binding: ActivityMainBinding
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// 略
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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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+ binding = ActivityMainBinding.inflate(layoutInflater)
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+ setContentView(binding.root)
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}
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override fun onResume() {
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// 略
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- **hitText**.text = getString(R.string.hit_text)
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- **loseText**.text = getString(R.string.lose_text)
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+ binding.hitText.text = getString(R.string.hit_text)
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+ binding.loseText.text = getString(R.string.lose_text)
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```
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