小编Sar*_*Mjn的帖子

我需要为我正在开发的应用程序选项卡.所以我最终得到了tablayout,它包含很少的标签.代码如下:

private void setupNavTab() {
    int[][] states = new int[][]{
            new int[]{android.R.attr.state_selected},
            new int[]{-android.R.attr.state_selected},
            new int[]{-android.R.attr.state_enabled}
    };

    int[] colors = new int[]{
            ContextCompat.getColor(getActivity(), R.color.cricut_selected_green),
            ContextCompat.getColor(getActivity(), R.color.nav_bar_unselected_content),
            ContextCompat.getColor(getActivity(), R.color.edit_button_text_color_inactive)
    };
    ColorStateList cslist = new ColorStateList(states, colors);

    if (tabs != null) {
        tabs.removeAllTabs();
        tabs.setTabTextColors(cslist);

        firstTab = tabs.newTab().setTag(TAB_FIRST);
        View customFirstTabView = LayoutInflater.from(getActivity()).inflate(R.layout.tab_item_layout, null, false);
        firstTabView = (TextView) customFirstTabView.findViewById(R.id.textContainer);

        firstTabView.setText(R.string.first);
        firstTabView.setTextColor(cslist);
        firstTab.setCustomView(customFirstTabView);

        secondTab = tabs.newTab().setTag(TAB_SECOND);
        View customSecondView = LayoutInflater.from(getActivity()).inflate(R.layout.tab_item_layout, null, false);
        secondTabView = (TextView) customSecondView.findViewById(R.id.textContainer);

        secondTabView.setText(R.string.second);
        secondTabView.setTextColor(cslist);
        secondTab.setCustomView(customSecondView);

        thirdTab = tabs.newTab().setTag(TAB_THIRD);
        View customThirdTabView
                = …

我目前正在使用 okhttp 进行网络调用。我还需要 websocket 所以我是这样制作的：

public class WebSocketService extends Service implements WebSocketListener {
private static final String TAG = "WebSocketService";
private static final String BASE_URL = "ws://192.168.1.39:8080/websocket";

public static final int MSG_RESPONSE = 1;
public static final int MSG_HELLO = 2;
Messenger msger = new Messenger(new MessageHandler());
private WebSocket webSocket;
private boolean mWebSocketOpened = false;
private Messenger replyToMsngr;

@Override
public void onCreate() {
    super.onCreate();
    Log.i(TAG, "service oncreate");
    OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .readTimeout(0, TimeUnit.NANOSECONDS)
            .connectTimeout(15000, TimeUnit.MILLISECONDS)
            .retryOnConnectionFailure(true)
            .build();
    Request request …

我有一个带有多个 TextInputLayouts 的 xml。其中之一如下：

        <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/textInputEmail"
                app:layout_constraintStart_toStartOf="parent"
                android:layout_marginLeft="@dimen/default_margin"
                android:layout_marginStart="@dimen/default_margin"
                app:layout_constraintEnd_toEndOf="parent"
                android:layout_marginEnd="@dimen/default_margin"
                android:layout_marginRight="@dimen/default_margin"
                android:layout_marginTop="@dimen/default_margin_half"
                app:layout_constraintTop_toTopOf="parent"
                android:layout_marginBottom="@dimen/default_margin_half"
                app:layout_constraintBottom_toBottomOf="parent">

            <android.support.design.widget.TextInputEditText
                    android:id="@+id/editTextEmail"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/email"
                    android:text="@={viewModel.username}"
                    android:onTextChanged="@{(text, start, before, count) -> viewModel.onTextChanged(text)}"
                    android:inputType="textEmailAddress"/>
        </android.support.design.widget.TextInputLayout>

在我的视图模型中，我实现了文本更改侦听器，如下所示：

    fun onTextChanged(text: CharSequence){
    Log.i("LoginViewModel", "username = "+text)
}

我想做的是这样的：

    fun onTextChanged(text: CharSequence, view: View){
    when(view.id){
        R.id.editText1 -> doSomething1()
        R.id.editText2 -> doSomething2()
}

当数据绑定用于调用方法时，是否可以传递触发方法的视图的视图/ID/引用？

我有一个对象数组，例如

var objects: [AnimalDetailModel] = ...

还有三堂课

• AnimalDetailModel 是基类

• DogDetailModel 是延伸的课程 AnimalDetailModel

• CatDetailModel 是延伸的课程 AnimalDetailModel

从A datasource创建并添加DogDetailModel，，CatDetailModel和AnimalDetailModel的数组objects。并填充的tableView当我想要的是得到一个对象表单对象，并检查它是否是类型的DogDetailModel，CatDetailModel或AnimalDetailModel像

if let objects[indexPath.row] as? DogDetailModel {    
    return DogTableCell    
} else if let objects[indexPath.row] as? CatDetailModel {    
    return CatTableCell     
} else {    
    return AnimalTableCell    
}

这样做时，我得到的类型AnimalDetailModel没有下标成员。我们如何从对象数组中检查对象的类型？

我正在使用Library greendao将数据类型保存到本地数据库.设置实体并运行应用程序后,在api响应中添加了一个新属性.它变成了这样的东西.之前:

@Entity
public class Data{
    @Id
    long id;
    String name;
    String detail;
}

后:

@Entity
public class Data{
    @Id
    long id;
    String name;
    String detail;
    String image;
  }

更新数据类型后,我重新安装了应用程序,然后运行应用程序,但是android.database.sqlite.SQLiteException出错:没有这样的列:T.IMAGE(代码1):,编译时:SELECT T."_ id",T. "NAME",T."DETAIL",T."图像"来自"DATA"T

我该如何解决这个问题？