在自定义的 Property delegate 中添加 'getValue(Context, KProperty<*>)' 方法即可。例如，以下是一个名为 StringPreference 的 Property delegate 的示例代码：

import android.content.Context
import androidx.datastore.preferences.core.Preferences
import androidx.datastore.preferences.core.edit
import androidx.datastore.preferences.core.stringPreferencesKey
import androidx.datastore.preferences.preferencesDataStore

private val Context.dataStore by preferencesDataStore("data_store")

class StringPreference(private val key: String) {

    operator fun getValue(context: Context, property: KProperty<*>): String {
        val preferencesKey = stringPreferencesKey(key)
        val dataStore = context.dataStore
        val valueFlow = dataStore.data.map { preferences ->
            preferences[preferencesKey] ?: ""
        }
        return runBlocking { valueFlow.first() }
    }

    operator fun setValue(context: Context, property: KProperty<*>, value: String) {
        val preferencesKey = stringPreferencesKey(key)
        val dataStore = context.dataStore
        runBlocking {
            dataStore.edit { preferences ->
                preferences[preferencesKey] = value
            }
        }
    }
}

使用示例：

class MainActivity : AppCompatActivity() {
    private val stringPreference by lazy { StringPreference("key_name") }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val value = stringPreference.getValue(this, ::stringPreference)
        Log.d("StringPreferenceTest", "Value: $value")
        stringPreference.setValue(this, ::stringPreference, "NewValue")
    }
}