如何在碎片中启动领域？

Question

我需要从片段初始化领域，但我得到以下警告:

Required: Context
Found: Context

代码:

class MyRealm: Fragment() {

    private lateinit var realm : Realm

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_realm, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        Realm.init(context)

        val configuration = RealmConfiguration.Builder()
            .name("MyRealm.db")
            .deleteRealmIfMigrationNeeded()
            .schemaVersion(0)
            .build()

        Realm.setDefaultConfiguration(configuration)

        realm = Realm.getDefaultInstance()
    }

}

我做错了什么？

Answer 1

建议在try/catch块中打开和关闭领域

    try {
 Realm realm = Realm.getDefaultInstance();
 //Use the realm instance

}catch(Exception e){
  //handle exceptions
}finally {
    realm.close();
}

还要检查minSdkVersion>=19和Java>=7，您可以查看官方文档以获得更多详细信息https://realm.io/docs/Java/latest/#closing-realms

还要使用getActivity()代替(context)。 activity是一个上下文（因为activity扩展了上下文)。