如何在 SliceProvider 上进行网络 API 调用并在 Slice 上设置信息

Question

这几天一直在纠结这个问题。所以我想在 Android Slices 上做的是使用来自后端服务的信息创建切片。例如：在 SliceProvider class

@Override
public Slice onBindSlice(Uri sliceUri) {
    l.d(TAG,"onBindSlice called");
    switch (sliceUri.getPath()) {
        case "/product":
            makeRequestForProduct();
            return createProductSlice(sliceUri);
    }
    return null;
}

和

private void makeRequestForProduct() {
    String url = Environment.getInstance().getCompleteUrl("etc..");
    RetrofitFactory.defaultBuilder(ProductWebInterface.class)
            .getProductResponse(url).enqueue(new ProductWebcallback());
}
public void onEventMainThread(ProductReceivedEvent response) {
    if (response.getProduct() != null) { //do something
    }
}

但是我不知道该怎么做。上面的代码不起作用。它给了我一个例外。

Answer 1

根据 Google 文档 here ：

onBindSlice should return as quickly as possible so that the UI tied to this slice can be responsive. No network or other IO will be allowed during onBindSlice. Any loading that needs to be done should happen in the background with a call to ContentResolver.notifyChange(Uri, ContentObserver) when the app is ready to provide the complete data in onBindSlice.

因此您必须在后台线程中完成工作。

请参阅下面的 Kotlin 示例：

 private fun makeRequestForProductInTheBackground(sliceUri : SliceUri) {
        Completable.fromAction {
            makeRequestForProduct(sliceUri)
        }.subscribeOn(Schedulers.io()).subscribe()
 }

请求完成后，您可以将数据保存在某个地方，例如变量或存储库。

fun onEventMainThread(response: ProductReceivedEvent) {
        if (response.getProduct() != null) { 
          //Save your data in a variable or something depending on your needs
          product == response.getProduct()

          //This will call the *onBindSlice()* method again
          context?.contentResolver?.notifyChange(sliceUri, null)
        }
    }

然后您可以在 createProductSlice(sliceUri) 方法中使用产品数据

如何在 SliceProvider 上进行网络 API 调用并在 Slice 上设置信息

How to make network API calls on SliceProvider and set the information on Slice

android

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android-slices