对于DataBinding不熟悉的小伙伴可以去官网了解下使用教程： https://developer.android.google.cn/topic/libraries/data-binding
这里就不详细介绍DataBinding了，接下来我列举下在项目中常用的结合不同控件的使用情况，当然还有很多控件没有使用到，在这里就不一一列举了，后期会持续更新上来。
1. ImageView

@BindingAdapter(value = {"url"})
public static void url(ImageView imageView,String url) {
    //此处可以使用图片请求框架, 例如
    Picasso.get().load(url).error(R.drawable.ic_empty).into(imageView);
ImageView中使用BindingAdapter中的value值 $\color{#0000FF}{url}$ ,如何使用，代码如下：
app:url ="@{网络图片地址}"
图片层级设置
@BindingAdapter(value = {"levels"})
public static void setLevel(ImageView imageView,int levels) {
    imageView.setImageLevel(levels);
矢量图颜色修改
@BindingAdapter(value = {"tints"})
public static void setTints(ImageView imageView, @ColorInt int color) {
    imageView.getDrawable().setTint(color);
GIF图片加载
@BindingAdapter({"asset"})
public static void setImageAssent(GifImageView view, String assent) {
    try {
        GifDrawable gifFromAssets = new GifDrawable(view.getContext().getAssets(), assent);
        view.setImageDrawable(gifFromAssets);
    } catch (IOException e) {
        e.printStackTrace();
2. RadioGroup
    <RadioGroup
        android:orientation="horizontal"
        android:onCheckedChanged="@{(group, buttonId) -> vm.setGroupSpeedIndex(group.indexOfChild(group.findViewById(buttonId)))}"
        <androidx.appcompat.widget.AppCompatRadioButton
            android:checked="@{vm.parameterBean.speedValue==1}"
            android:text="低"/>
        <androidx.appcompat.widget.AppCompatRadioButton
            android:checked="@{vm.parameterBean.speedValue==2}"
            android:text="中"/>
        <androidx.appcompat.widget.AppCompatRadioButton
            android:checked="@{vm.parameterBean.speedValue==3}"
            android:text="高"/>
    </RadioGroup>
viewModel中的方法
    public void setGroupSpeedIndex(int index) {
          parameterBean.getSpeedValue().set(index+1);
获取的值使用双向绑定BaseObservable
public class ConfigParameterBean extends BaseObservable {
private ObservableField<Integer>  speedValue;  
public ConfigParameterBean(){
    speedValue  = new ObservableField<>(2);
public ObservableField<Integer> getSpeedValue() {
    return speedValue;
3. SeekBar 同上RadioGroup的用法
    <androidx.appcompat.widget.AppCompatSeekBar
        android:progress="@={vm.parameterBean.downUpValue}"
4. RecycleView
 $\color{#0000FF}{app:decoration}$ 属性是获取分割线，recycleView中使用如下：
    <androidx.recyclerview.widget.RecyclerView
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:decoration="@{vm.getItemDecoration()}"
            app:adapter="@{vm.adapter}"
bindingAdapter中的使用：
@BindingAdapter(value = {"decoration"})
public static void setDecoration(RecyclerView recyclerView, RecyclerView.ItemDecoration itemDecoration) {
    recyclerView.addItemDecoration(itemDecoration);
ViewModel中的使用：
public RecyclerView.ItemDecoration getItemDecoration(){
    DividerItemDecoration itemDecoration = new DividerItemDecoration(getApplication(), DividerItemDecoration.VERTICAL);
    itemDecoration.setDrawable(Objects.requireNonNull(ContextCompat.getDrawable(getApplication(), R.drawable.bg_trans_item_height_10)));
    return itemDecoration;
//适配器
public MapAdapter getAdapter(){
    return adapter;
5. SwipeRefreshLayout
SwipeRefreshLayoutd控件的使用， $\color{#0000FF}{app:colorResIds}$ 加载颜色的设置，如下：
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        app:colorResIds="@{vm.getColorResId()}"
        app:refreshing="@{vm.isRefreshing}"
        app:onRefreshListener="@{vm::onRefresh}"
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
bindingAdapter中的使用：
@BindingAdapter(value = {"colorResIds"})
public static void setColorResIds(SwipeRefreshLayout refreshLayout,@ColorRes int... colorInt) {
    refreshLayout.setColorSchemeResources(colorInt);
ViewModel中的使用：

public @ColorRes int[] getColorResId(){
    return new int[]{R.color.purple_200,R.color.purple_500,R.color.purple_700,R.color.teal_200,R.color.teal_700};
public MutableLiveData<Boolean> getIsRefreshing() {
    return isRefreshing;
6. SmartRefreshLayout
SmartRefreshLayout的使用(目前使用2.0.3版本)
    <com.scwang.smart.refresh.layout.SmartRefreshLayout
        app:hasMore="@{vm.hasMore}"
        app:refreshing="@{vm.refreshing}"
        app:moreLoading="@{vm.moreLoading}"
        app:onRefreshListener="@{()->vm.onRefresh()}"
        app:onLoadMoreListener="@{()->vm.onLoadMore()}"
        <androidx.recyclerview.widget.RecyclerView
    </com.scwang.smart.refresh.layout.SmartRefreshLayout>
bindingAdapter中的使用：
@BindingAdapter(value = {"refreshing","moreLoading","hasMore"},requireAll = false)
public static void bindSmartRefreshLayout(SmartRefreshLayout smartLayout, Boolean refreshing, Boolean moreLoading, Boolean hasMore) {
    if (!refreshing) smartLayout.finishRefresh();
    if (!hasMore) smartLayout.finishLoadMoreWithNoMoreData();
    if (!moreLoading) smartLayout.finishLoadMore();
@BindingAdapter(value = {"autoRefresh"})
public static void bindSmartRefreshLayout(SmartRefreshLayout smartLayout,boolean autoRefresh) {
    if (autoRefresh) smartLayout.autoRefresh();
@BindingAdapter(value = {"onRefreshListener","onLoadMoreListener"},requireAll = false)
public static void bindSmartRefreshLayout(SmartRefreshLayout smartLayout, OnRefreshListener onRefreshListener, OnLoadMoreListener onLoadMoreListener) {
    smartLayout.setOnRefreshListener(onRefreshListener);
    smartLayout.setOnLoadMoreListener(onLoadMoreListener);
@BindingAdapter(value = {"refreshing"})
public static void bindSmartRefreshLayout(SwipeRefreshLayout swipeRefreshLayout, Boolean refreshing) {
    swipeRefreshLayout.setRefreshing(refreshing);
veiwModel中的使用：
继承于BaseViewModelPage，实现 $\color{#FF0000}{onRefresh()、onLoadMore()}$  方法;
数据加载完成要记得调用 $\color{#FF0000}{onRefreshSuccess()、onRefreshError()}$ 方法
autoRefresh()方法未使用，待验证，如果有问题可以告诉我。
@Override
public void onRefresh() {
    super.onRefresh();
    requestData();//数据请求
@Override
public void onLoadMore() {
    super.onLoadMore();
    requestData();
//大家可以根据自己的需求去处理数据加载逻辑
private void requestData() {
    if (null != iViewListener) iViewListener.startLoading();
    //noinspection ConstantConditions
    requestManager.getMessages(getPage().getValue(), 20)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Observer<MessagesBean>() {
                @Override
                public void onSubscribe(@NonNull Disposable d) {
                @Override
                public void onNext(@NonNull MessagesBean success) {
                    if (null != iViewListener)iViewListener.stopLoading();
                    if (null != success.getData() && success.getData().size() > 0) {
                        total = success.getTotalCount();
                        data.addAll(success.getData());
                    adapter.notifyDataSetChanged();
                    onRefreshSuccess();
                @Override
                public void onError(@NonNull Throwable e) {
                    if (null != iViewListener) iViewListener.stopLoading();
                    adapter.notifyDataSetChanged();
                    onRefreshError();
                @Override
                public void onComplete() {
viewModel的基类代码较多，这里将源码贴出来
public abstract class BaseViewModelPage<D> extends BaseModel {
private final MutableLiveData<Integer> page = new MutableLiveData<>();       //页码
private final MutableLiveData<Boolean> refreshing = new MutableLiveData<>(); //刷新
private final MutableLiveData<Boolean> moreLoading = new MutableLiveData<>();//加载更多
private final MutableLiveData<Boolean> hasMore = new MutableLiveData<>();    //是否全部加载
private final MutableLiveData<Boolean> autoRefresh = new MutableLiveData<>();//自动刷新
protected final List<D> data = new ArrayList<>();  //数据集合
protected int total = 0;                           //数据总数
public BaseViewModelPage(@NonNull Application application) {
    super(application);
    page.setValue(0);
    refreshing.setValue(true);
    moreLoading.setValue(true);
    hasMore.setValue(true);
    autoRefresh.setValue(false);
@CallSuper
public void onLoadMore() {
    page.setValue(page.getValue()==null?0: page.getValue()+1);
    if (refreshing.getValue())refreshing.setValue(false);
    if (!moreLoading.getValue())moreLoading.setValue(true);
@CallSuper
public void onRefresh() {
    page.setValue(0);
    refreshing.setValue(true);
    if (data.size()>0) data.clear();
    if (moreLoading.getValue()) moreLoading.setValue(false);
    if (!hasMore.getValue()) hasMore.setValue(true);
@CallSuper
public void autoRefresh() {
    autoRefresh.setValue(true);
public MutableLiveData<Integer> getPage() {
    return page;
public MutableLiveData<Boolean> getHasMore() {
    return hasMore;
public MutableLiveData<Boolean> getRefreshing() {
    return refreshing;
public MutableLiveData<Boolean> getMoreLoading() {
    return moreLoading;
public MutableLiveData<Boolean> getAutoRefresh() {
    return autoRefresh;
protected void onRefreshSuccess(){
    if (page.getValue() == 0) {
        if (refreshing.getValue()) refreshing.setValue(false);
    } else {
        if (data.size()>= total) {
            if (hasMore.getValue()) hasMore.setValue(false);
        } else {
            if (!hasMore.getValue()) hasMore.setValue(true);
        if (moreLoading.getValue())moreLoading.setValue(false);
protected void onRefreshError() {
    if (page.getValue() == 0) {
        if (!refreshing.getValue()) refreshing.setValue(true);
    } else {
        if (data.size()>= total) {
            if (hasMore.getValue()) hasMore.setValue(false);
        } else {
            if (!hasMore.getValue()) hasMore.setValue(true);
        if (moreLoading.getValue())moreLoading.setValue(false);
//重写父类的方法子类也需要调用时使用
@CallSuper
@Override
public void onCleared() {
DataBindingAdapter在项目中实战

DataBindingAdapter在项目中实战

1. ImageView

2. RadioGroup

3. SeekBar 同上RadioGroup的用法

4. RecycleView

5. SwipeRefreshLayout

6. SmartRefreshLayout
