java - 将 boolean 值绑定(bind)到复选框 MVVM

Question

我试图通过 View 模型将 boolean 值绑定(bind)到 View ，但 Android Studio 抛出错误，我找不到问题所在。 viewModel.infilltype 是一个 boolean 值，android:checked 也应该是一个 boolean 值。

“错误:'@{viewModel.infillType}' 与属性 android:checked (attr) boolean 值不兼容。Message{kind=ERROR, text=error: '@{viewModel.infillType}' 与属性 android:checked (attr) boolean 不兼容。, sources=[E:\SportveldOnderhoud\app\src\main\res\layout\list_item_check .xml:14], original message=, tool name=Optional.of(AAPT)}"

我有以下代码(我会粘贴相关的 fragment )

Check.java(模型)

public class Check {

    private UUID mId;
    private String mTitle;
    private Date mDate;
    ....
    private boolean mInfilltype;
    ....

    public Check() {
        this(UUID.randomUUID());
    }

    public Check(UUID id) {
        mId = id;
        mDate = new Date();
    }
    public UUID getId() {
        return mId;
    }

    ....

    public boolean isInfilltype() {
        return mInfilltype;
    }

    public void setInfilltype(boolean infilltype) {
        mInfilltype = infilltype;
    }
}

View 模型:

public class CheckViewModel extends BaseObservable {
    private Check mCheck;
    private Activity mActivity;

    public CheckViewModel(Activity activity) {
        mActivity = activity;
    }

    @Bindable
    public String getTitle() {
        return mCheck.getTitle();
    }

    @Bindable
    public String getRenderedDate() {
        return mCheck.getDate().toString();
    }

    @Bindable
    public boolean infillType() {
        return mCheck.isInfilltype();
    }

    public Check getCheck() {
        return mCheck;
    }

    public void setCheck(Check crime) {
        mCheck = crime;
        List<String> strings;
        notifyChange();
    }

    public void onCheckClicked() {
        Intent intent = CheckPagerActivity.newIntent(mActivity, mCheck.getId());
        mActivity.startActivity(intent);
    }
}

查看:

<?xml version="1.0" encoding="utf-8"?>
<layout>
    <data>
        <variable name="viewModel" type="nl.lekolkman.android.sportveldonderhoud.CheckViewModel" />
    </data>

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="@{() -> viewModel.onCheckClicked()}"
        >

        <CheckBox
            android:id="@+id/solved_check_box"
            android:checked="@{viewModel.infillType}"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"/>

        <TextView
            android:id="@+id/title_text_view"
            android:text="@{viewModel.title}"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/solved_check_box"
            android:textStyle="bold"
            tools:text="Crime Title"/>

        <TextView
            android:id="@+id/date_text_view"
            android:text="@{`Date solved: ` + viewModel.renderedDate ?? `(not solved)`}"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/solved_check_box"
            android:layout_below="@id/title_text_view"
            tools:text="Check Date"/>

    </RelativeLayout>
</layout>

Answer 1

原来还得加上:

android { 
...
    dataBinding {
            enabled = true
        } 

在 build.gradle 中

然后它仍然没有工作，但是在将 maven 添加到 build.gradle 文件中的存储库之后它确实工作了