如何将单击处理程序 link 到片段以进行数据绑定？

Question

我想在片段中使用数据绑定来触发我在处理程序中的所有按钮点击 class。当我运行下面的代码时，出现以下错误。

D:\Coding\updatedGithub\AndroidHiveDataBindingFragments\app\build\generated\ap_generated_sources\debug\out\com\example\androidhivedatabindingfragments\DataBinderMapperImpl.java:10: error: cannot find symbol
import com.example.androidhivedatabindingfragments.databinding.FragmentUserBindingImpl;
                                                              ^
  symbol:   class FragmentUserBindingImpl
  location: package com.example.androidhivedatabindingfragments.databinding

我不确定问题是我如何将上下文传递给处理程序 class 还是我在数据绑定方面做错了。

用户片段

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        FragmentUserBinding binding = DataBindingUtil.inflate(inflater, R.layout.fragment_user, container, false);
        View view = binding.getRoot();

        User user = new User();
        user.setName("First Last");
        user.setEmail("email@email.com");

        binding.setUser(user);

        MyClickHandlers handlers = new MyClickHandlers(getActivity());
        binding.setHandlers(handlers);


        return view;
    }

MyClickHandlers

public class MyClickHandlers {
    private static final String TAG = "MyClickHandlers";

    Context context;

    public MyClickHandlers(Context context) {
        this.context = context;
    }

    public void myClick() {
        Log.d(TAG, "myClick: ");
    }
}

fragment_user

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:bind="http://schemas.android.com/apk/res-auto">

    <data>
        <variable
            name="user"
            type="com.example.androidhivedatabindingfragments.User" />
        <variable
            name="handlers"
            type="com.example.androidhivedatabindingfragments.MyClickHandlers" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".UserFragment"
        android:orientation="vertical">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Click ME"
            android:id="@+id/btn_Click"
            android:onClick="@{handlers::myClick}"/>

        <include android:id="@+id/content"
        layout="@layout/content_main"
        bind:user="@{user}" />

    </LinearLayout>
</layout>

Answer 1

您的 onClick() 或 MyHandlers 必须将您单击的视图作为参数，因此将其更改为：

public void myClick(View view) {
    Log.d(TAG, "myClick: ");
}

我想这会解决问题，另外请用上下文实例化 MyClickHandlers 而不是 activity，因为两者是不同的东西。

所以在 onCreateView() 中，添加 requireContext() 而不是 getActivity()

MyClickHandlers handlers = new MyClickHandlers(requireContext());

如何将单击处理程序 link 到片段以进行数据绑定？

How to link a click handler to a fragment for data binding?

java

android

android-fragments

android-databinding