對于DataBinding不熟悉的小伙伴可以去官網(wǎng)了解下使用教程：https://developer.android.google.cn/topic/libraries/data-binding
這里就不詳細介紹DataBinding了佃蚜，接下來我列舉下在項目中常用的結合不同控件的使用情況湖饱，當然還有很多控件沒有使用到闰蛔，在這里就不一一列舉了唁情，后期會持續(xù)更新上來渺杉。
1. ImageView
圖片加載
@BindingAdapter(value = {"url"})
public static void url(ImageView imageView,String url) {
//此處可以使用圖片請求框架, 例如
Picasso.get().load(url).error(R.drawable.ic_empty).into(imageView);
}
ImageView中使用BindingAdapter中的value值
,如何使用悼泌，代碼如下：
app:url ="@{網(wǎng)絡圖片地址}"
圖片層級設置
@BindingAdapter(value = {"levels"})
public static void setLevel(ImageView imageView,int levels) {
imageView.setImageLevel(levels);
}
矢量圖顏色修改
@BindingAdapter(value = {"tints"})
public static void setTints(ImageView imageView, @ColorInt int color) {
imageView.getDrawable().setTint(color);
}
GIF圖片加載
@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
單選
<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);
}
獲取的值使用雙向綁定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
屬性是獲取分割線垛耳，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;
}
//適配器
public MapAdapter getAdapter(){
return adapter;
}
5. SwipeRefreshLayout
SwipeRefreshLayoutd控件的使用，
加載顏色的設置啸箫，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：
- 繼承于BaseViewModelPage，實現(xiàn)
方法;
- 數(shù)據(jù)加載完成要記得調(diào)用
方法
- autoRefresh()方法未使用唱较，待驗證，如果有問題可以告訴我召川。
@Override
public void onRefresh() {
super.onRefresh();
requestData();//數(shù)據(jù)請求
}
@Override
public void onLoadMore() {
super.onLoadMore();
requestData();
}
//大家可以根據(jù)自己的需求去處理數(shù)據(jù)加載邏輯
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的基類代碼較多南缓，這里將源碼貼出來
public abstract class BaseViewModelPage<D> extends BaseModel {
private final MutableLiveData<Integer> page = new MutableLiveData<>(); //頁碼
private final MutableLiveData<Boolean> refreshing = new MutableLiveData<>(); //刷新
private final MutableLiveData<Boolean> moreLoading = new MutableLiveData<>();//加載更多
private final MutableLiveData<Boolean> hasMore = new MutableLiveData<>(); //是否全部加載
private final MutableLiveData<Boolean> autoRefresh = new MutableLiveData<>();//自動刷新
protected final List<D> data = new ArrayList<>(); //數(shù)據(jù)集合
protected int total = 0; //數(shù)據(jù)總數(shù)
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);
}
}
//重寫父類的方法子類也需要調(diào)用時使用
@CallSuper
@Override
public void onCleared() {
super.onCleared();
}
}
