import com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter; //导入依赖的package包/类
@Test
public void devicesAtTopLevel() {
    ExpandableDeviceAdapter adapter = ExpandableDeviceAdapter.createEmpty(mSensorRegistry,
            mDeviceRegistry, null, null, 0);
    assertTrue(adapter instanceof ExpandableRecyclerAdapter);

    assertEquals(0, adapter.getParentItemList().size());

    ConnectableSensor sensor = mScenario.makeConnectedSensorNewDevice();
    adapter.addSensor(mScenario.newSensorKey(), sensor);
    assertEquals(1, adapter.getParentItemList().size());
    assertEquals(1, adapter.getParentItemList().get(0).getChildItemList().size());
    assertEquals(mDeviceRegistry.getDevice(sensor.getSpec()).getName(),
            adapter.getDevice(0).getDeviceName());
}
 

import com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter; //导入依赖的package包/类
public void addExpandCollapseListener(ExpandableRecyclerAdapter.ExpandCollapseListener expandCollapseListener) {
    mExpandCollapseListener = expandCollapseListener;
}