如何使用Fragment进行数据绑定

我试图遵循官方谷歌文档https://developer.android.com/tools/data-binding/guide.html的数据绑定示例

除了我试图将数据投标应用到一个片段，而不是一个活动。

编译时我目前得到的错误是

错误:(37,27)没有指定资源类型(at 'text' with value '@{marsdata.martianSols})。

onCreate for fragment是这样的:

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    MartianDataBinding binding = MartianDataBinding.inflate(getActivity().getLayoutInflater());
    binding.setMarsdata(this);
}

onCreateView for fragment看起来像这样:

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    return inflater.inflate(R.layout.martian_data, container, false);
}

和部分我的布局文件片段看起来像这样:

<?xml version="1.0" encoding="utf-8"?>

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="marsdata"
            type="uk.co.darkruby.app.myapp.MarsDataProvider" />
    </data>
...

        <TextView
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:text="@{marsdata.martianSols}"
        />

    </RelativeLayout>
</layout>

我的怀疑是MartianDataBinding不知道它应该与哪个布局文件绑定-因此出现错误。有什么建议吗?

当前回答

你实际上被鼓励使用你生成的Binding的膨胀方法，而不是DataBindingUtil:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    MainFragmentBinding binding = MainFragmentBinding.inflate(inflater, container, false);
    //set variables in Binding
    return binding.getRoot();
}

(MainFragmentBinding为r.b ayout.main_fragment自动生成)

databindingutil . inflation()文档:

仅在layoutId预先未知的情况下使用此版本。否则，使用生成的Binding的膨胀方法来确保类型安全的膨胀。

2016-11-10 12:37:26

其他回答

在Android DataBinding中试试这个

FragmentMainBinding binding;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        binding = DataBindingUtil.inflate(inflater, R.layout.fragment_main, container, false);
        View rootView = binding.getRoot();
        initInstances(savedInstanceState);
        return rootView;
}

2016-07-01 23:55:15

Kotlin中的最短路径;

class HomeFragment : Fragment(R.layout.fragment_home) {


override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    val binding = FragmentHomeBinding.bind(view)
    // todo 
    }

2022-03-15 23:07:10

可以像下面提到的那样简单地检索视图对象

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

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

return view;

}

2016-06-09 11:10:35

正如大多数人所说，但是不要忘记设置LifeCycleOwner Java示例即

public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    BindingClass binding = DataBindingUtil.inflate(inflater, R.layout.fragment_layout, container, false);
    ModelClass model = ViewModelProviders.of(getActivity()).get(ViewModelClass.class);
    binding.setLifecycleOwner(getActivity());
    binding.setViewmodelclass(model);

    //Your codes here

    return binding.getRoot();
}

2019-07-04 17:36:59

如果你使用ViewModel和LiveData，这是足够的语法

Kotlin 语法：

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    return MartianDataBinding.inflate(
        inflater,
        container,
        false
    ).apply {
        lifecycleOwner = viewLifecycleOwner
        vm = viewModel    // Attach your view model here
    }.root
}

2018-12-26 13:17:50

如何使用Fragment进行数据绑定

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