java - 内部类上的 Android 数据绑定(bind)不更新 TextView

Question

应用程序运行，但 TextView 未获得更新，此处是相关代码。

activity_picker_dashboard.xml

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Top header -->

    <include layout="@layout/layout_header" /> This layout has databinding

    <!-- DrawerLayout -->

    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer_layout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/gray"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar">
.....

这是layout_header.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="profilePayload"
            type="myms.models.ProfileResponse.Payload"/>
    </data>

<Toolbar
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:padding="8dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white">

<android.support.constraint.ConstraintLayout
    android:id="@+id/header"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <ImageView
        android:layout_width="180dp"
        android:layout_height="60dp"
        android:adjustViewBounds="true"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:src="@drawable/logo_color"/>

    <TextView
        android:id="@+id/username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:text="@{profilePayload.firstName}" Here it is
        android:textColor="@color/red"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/role"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_chainStyle="packed" />

...............
</Toolbar>
</layout>

这是我的模型 ProfileResponse.java

public class ProfileResponse
{
    public Payload getPayLoad() {
        return payLoad;
    }

    @SerializedName("Payload")
    private Payload payLoad;

    public static class Payload
    {
        public String getProfileId() {
            return profileId;
        }

        public String getUserId() {
            return userId;
        }

        public String getFirstName() {
            return firstName;
        }

        public String getLastName() {
            return lastName;
        }

        @SerializedName("ProfileId")
        private String profileId;

        @SerializedName("UserId")
        private String userId;

        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }

        public void setLastName(String lastName) {
            this.lastName = lastName;
        }

        @SerializedName("FirstName")

        private String firstName;

        @SerializedName("LastName")
        private String lastName;
    }
}

最后这是我的 Activity

 public class PickerDashboardActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_picker_dashboard);

        LayoutHeaderBinding binding = LayoutHeaderBinding.inflate(getLayoutInflater());

        ProfileResponse.Payload profilePayload = new ProfileResponse.Payload();
        profilePayload.setFirstName("Test");

        binding.setProfilePayload(profilePayload);

        ButterKnife.bind(this);
}

请提出解决方案。我已经尝试这个有一段时间了。 P.S:我也在用黄油刀。

Answer 1

问题在于如何将数据绑定(bind)布局与常规布局混合在一起。

如果要包含常规布局中的数据绑定(bind)布局，则需要找到布局的 Root View 并对其调用 bind() 。也许是这样的:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_picker_dashboard);
    View bindingRoot = findViewById(R.id.toolbar);

    LayoutHeaderBinding binding = LayoutHeaderBinding.bind(bindingRoot);

    ProfileResponse.Payload profilePayload = new ProfileResponse.Payload();
    profilePayload.setFirstName("Test");

    binding.setProfilePayload(profilePayload);
}

但是，最好使您的 Activity 布局成为数据绑定(bind)布局，这样您就不必做额外的工作:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="profilePayload"
            type="myms.models.ProfileResponse.Payload"/>
    </data>
    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!-- Top header -->

        <include layout="@layout/layout_header" app:profilePayload="@{profilePayload}" />

        <!-- DrawerLayout -->
    </android.support.constraint.ConstraintLayout>
</layout>

然后您的绑定(bind)代码会变得更加简单且不易出错:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ActivityPickerDashboardBinding binding = 
        DataBindingUtil.setContentView(this, R.layout.activity_picker_dashboard);

    ProfileResponse.Payload profilePayload = new ProfileResponse.Payload();
    profilePayload.setFirstName("Test");

    binding.setProfilePayload(profilePayload);
}

另一方面，我认为 Android 数据绑定(bind)和 butterknife 在功能上有很大的重叠，我建议选择其中之一，但不要同时选择两者。