getContext().getContentResolver().notifyChange(sliceUri, observer);
observer 一般为null  通过sliceUri 来通知
getContext().getContentResolver().notifyChange(sliceUri, null);

SliceProvider 继承自ContentProvider

构造方法的时候会传入

authorities

public BaseSliceProvider(String authorities, String[] permissions) {super(permissions);mSliceUri = Uri.parse("content://" + authorities + "/");
}

getContext().getContentResolver().notifyChange(sliceUri, null);会触发

onBindSlice

通过 ListBuilder创建

Slice 发送

对方通过SliceLiveData监听

mSliceLiveData = SliceLiveData.fromUri(CardiffSystemUIApplication.getGlobalContext(), UriUtil.getSliceUri(getAction()));

this.mSliceLiveData.observeForever(this);

这里的this 就是监听slice

public void onChanged(Slice slice) 

获取slice里面传递的值

另外一端是通过

action.getActionItem().fireActionInternal(context,new Intent().addFlags(Intent.FLAG_RECEIVER_FOREGROUND | 0x01000000));