小编ice*_*rit的帖子

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我是 kotlin 的初学者，我正在尝试过滤一个列表中存在的项目，但是我为此使用了循环和迭代器。我在in这里的 if 条件中被提及异常。有人可以指导我哪里出错了。我在这里粘贴我的功能。

fun getGateWays(
        gateways: ArrayList<JsonObject>?,
        callback: ResponseCallback<ArrayList<JsonObject>, String>
    ) {


        getDistinctGateways(object : ResponseCallback<List<String>?, String>() {

            override fun onFailure(failure: String) {
            }

            override fun onSuccess(response: List<String>?) {

                for(e in gateways!!.iterator()){
                    if(e.get("value") in response){
                        gateways.remove(e)
                    }
                }
                callback.onSuccess(gateways!!)
            }

        })

    }

我正在尝试在 android 中实现数据绑定示例并创建一个带有可绑定变量的 POJO，我收到此错误！请帮忙。我正在关注本教程 http://www.vogella.com/tutorials/AndroidDatabinding/article.html，这是我的代码

import android.databinding.BaseObservable;
import android.databinding.Bindable;

public class TemperatureData extends BaseObservable {
    private String location;
    private String celsius;

    public TemperatureData(String location, String celsius) {
        this.location = location;
        this.celsius = celsius;
    }

    @Bindable
    public String getCelsius() {
        return celsius;
    }

    @Bindable
    public String getLocation() {
        return location;
    }

    public  void setLocation(String location){
        this.location = location;
        notifyPropertyChanged(BR.location);
    }

    public void setCelsius(String celsius) {
        this.celsius = celsius;
        notifyPropertyChanged(BR.celsius);
    }

}

startActivityForResult(intent,3021) 

我用了很长时间了，现在不推荐使用这种方法了吗？

我最近迁移到最新的回调机制来注册请求权限，但是用于注册请求回调的最新 api 从未被触发我正在附加代码片段，任何人都可以帮助我找到问题所在，

        @AndroidEntryPoint
class ManageTeamFragment : Fragment(), View.OnClickListener {

    @Inject
    lateinit var manageTeamViewModel: ManageTeamViewModel

    private var requestMultiplePermissions:ActivityResultLauncher<Array<out String>>? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        requestMultiplePermissions =
            registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) {
                println("DEBUG $it")
                if (allPermissionsGranted()) {
                    btnAddUser.showLoading(true)
                    btnAddUser.postDelayed({
                        (activity as? DashboardActivity)?.navToFragment(AddUserFragment(), true)
                    }, 10)
                } else {
                    if (addOrEditUserBottomSheet == null) {
                        addOrEditUserBottomSheet =
                            AddOrEditUserBottomSheet(toolbar.context, addOrEditUserInteractionsListener)
                    }
                    addOrEditUserBottomSheet?.showBottomSheet()
                }
            }

    }


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {



        return inflater.inflate(R.layout.fragment_manage_team, container, false)
    }

    override fun …

我正在使用房间数据库来创建本地存储，我正在尝试迁移数据库，并且在多次调用迁移函数时遇到问题。

我在这里附上我的一段代码。

class DbInstance {
companion object {
    private var db: AppDatabase? = null
    fun getDbInstance(context: Context): AppDatabase {
        if (db == null)
            db = Room.databaseBuilder(
                context,
                AppDatabase::class.java, "mydb"
            )
                .addMigrations(MIGRATION_1_2, MIGRATION_2_3)
                .build()
        return db!!
    }

    private val MIGRATION_1_2 = object : Migration(1, 2) {
        override fun migrate(database: SupportSQLiteDatabase) {

        }
    }
    private val MIGRATION_2_3 = object : Migration(2, 3) {
        override fun migrate(database: SupportSQLiteDatabase) {
            println("------> called for MIGRATION_2_3")
            database.execSQL(
                "Alter table PaymentDB add column ui_name text"
            )
        } …

面对喷气背包组合中的一次崩溃，任何人都可以帮助我解决这个问题。

Fatal Exception: java.lang.IllegalArgumentException: offset(23) is out of bounds [0, 0]
   at androidx.compose.ui.text.MultiParagraph.requireIndexInRangeInclusiveEnd(MultiParagraph.kt:593)
   at androidx.compose.ui.text.MultiParagraph.getBidiRunDirection(MultiParagraph.kt:406)
   at androidx.compose.ui.text.TextLayoutResult.getBidiRunDirection(TextLayoutResult.kt:353)
   at androidx.compose.foundation.text.CoreTextFieldKt.SelectionToolbarAndHandles(CoreTextField.kt:816)
   at androidx.compose.foundation.text.CoreTextFieldKt.access$SelectionToolbarAndHandles(CoreTextField.kt:1)
   at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1$1.invoke(CoreTextField.kt:565)
   at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1$1.invoke(CoreTextField.kt:527)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
   at androidx.compose.runtime.ComposablesKt.ReusableComposeNode(ComposablesKt.java:443)
   at androidx.compose.foundation.text.selection.SimpleLayoutKt.SimpleLayout(SimpleLayout.kt:79)
   at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1.invoke(CoreTextField.kt:527)
   at androidx.compose.foundation.text.CoreTextFieldKt$CoreTextField$4$1.invoke(CoreTextField.kt:510)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:107)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
   at androidx.compose.material.OutlinedTextFieldKt.IconsWithTextFieldLayout-T2E5_Oc(OutlinedTextField.kt:452)
   at androidx.compose.material.OutlinedTextFieldKt.access$OutlinedTextField$lambda-3(OutlinedTextField.kt:1)
   at androidx.compose.material.OutlinedTextFieldKt$OutlinedTextFieldLayout$1.invoke(OutlinedTextField.kt:350)
   at androidx.compose.material.OutlinedTextFieldKt$OutlinedTextFieldLayout$1.invoke(OutlinedTextField.kt:348)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:116)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
   at androidx.compose.foundation.text.CoreTextFieldKt.CoreTextField(CoreTextField.kt:510)
   at androidx.compose.foundation.text.BasicTextFieldKt.BasicTextField(BasicTextField.kt:262)
   at androidx.compose.material.OutlinedTextFieldKt.OutlinedTextFieldLayout-uBqXD2s(OutlinedTextField.kt:322)
   at androidx.compose.material.TextFieldImplKt$TextFieldImpl$3.invoke-h1eT-Ww(TextFieldImpl.kt:207)
   at androidx.compose.material.TextFieldImplKt$TextFieldImpl$3.invoke(TextFieldImpl.kt:129)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:214)
   at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.jvm.kt:34)
   at androidx.compose.material.TextFieldTransitionScope.Transition-DTcfvLk(TextFieldImpl.kt:357)
   at androidx.compose.material.TextFieldImplKt.TextFieldImpl(TextFieldImpl.kt:119)
   at androidx.compose.material.OutlinedTextFieldKt.OutlinedTextField(OutlinedTextField.kt:270)
   at androidx.compose.material.OutlinedTextFieldKt.OutlinedTextField(OutlinedTextField.kt:157)
   at com.zee5.presentation.search.searchrefinement.composable.SearchRefinementScreenKt.TopTextInputView(SearchRefinementScreen.kt:131)
   at com.zee5.presentation.search.searchrefinement.composable.SearchRefinementScreenKt.SearchRefinementScreen(SearchRefinementScreen.kt:74)
   at …

这是我的代码: -

SplashActivity.java

public class SplashActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);`langData = "hi"`
            setLocale(langData);
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {

                    //setLocale(langData);
                    startActivity(new Intent(SplashActivity.this, MainActivity.class));
                    finish();
                }
            }, 3000);
        }



    public void setLocale(String lang) {
        Resources res = this.getResources();
        // Change locale settings in the app.
        DisplayMetrics dm = res.getDisplayMetrics();
        android.content.res.Configuration conf = res.getConfiguration();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            setSystemLocale(conf, new Locale(lang.toLowerCase()));
        } else {
            setSystemLocaleLegacy(conf, new Locale(lang.toLowerCase()));
        }
        res.updateConfiguration(conf, dm);
        //startActivity(new …

val string = "5 kg rice 2 kg wheat 3 kg Soya"

上面的字符串中是否有高阶函数来计算字符串“kg”？