我正在做一个基于信标的室内本地化应用程序。在我的应用程序中,我在ViewPager中加载了3个选项卡。第二个选项卡是一个地图片段,它应该根据信标信号显示用户所在位置的地图。更新事件中的android片段
public class Shop extends AppCompatActivity implements IndoorsLocationListener, ProximityManager.ProximityListener {
private static final String TAG = Shop.class.getSimpleName();
private IndoorsSurfaceFragment indoorsFragment;
private ProximityManagerContract proximityManager;
private ScanContext scanContext;
TabPagerAdapter adapter;
ViewPager viewPager;
// TODO : Add more event types like devices updated
private List<EventType> eventTypes = new ArrayList<EventType>() {{
// add(EventType.DEVICES_UPDATE);
add(EventType.DEVICE_DISCOVERED);
}};
private IBeaconScanContext beaconScanContext = new IBeaconScanContext.Builder()
.setEventTypes(eventTypes) //only specified events we be called on callback
.setRssiCalculator(RssiCalculators.newLimitedMeanRssiCalculator(5))
.build();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
proximityManager = new KontaktProximityManager(this);
setContentView(R.layout.activity_shop);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setTitle("Shopping");
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
viewPager = (ViewPager) findViewById(R.id.tab_content);
MapTabContentFragment mtcf = new MapTabContentFragment();
adapter = new TabPagerAdapter(getSupportFragmentManager());
IndoorsFactory.Builder indoorsBuilder = new IndoorsFactory.Builder();
IndoorsSurfaceFactory.Builder surfaceBuilder = new IndoorsSurfaceFactory.Builder();
indoorsBuilder.setContext(this);
// Set the API Key for Indoo.rs
indoorsBuilder.setApiKey(getResources().getString(R.string.indoors_api_key));
// Set the building's ID
indoorsBuilder.setBuildingId((long)762751544);
// Log.d(TAG+ " Building ID: ", Long.toString(pBuildingID));
// callback for indoo.rs-events
indoorsBuilder.setUserInteractionListener(this);
surfaceBuilder.setIndoorsBuilder(indoorsBuilder);
indoorsFragment = surfaceBuilder.build();
adapter.addFragment(new ListTabContentFragment(), "LIST");
adapter.addFragment(indoorsFragment, "MAP");
adapter.addFragment(new ARTabContentFragment(), "AR");
viewPager.setAdapter(adapter);
}
}
此代码段只是在创建活动时一次加载所有选项卡。现在我需要的是第二个片段(mtcf,“MAP”),只有在收到信标信号时才加载。
@Override
public void onEvent(BluetoothDeviceEvent bluetoothDeviceEvent) {
List<? extends RemoteBluetoothDevice> deviceList = bluetoothDeviceEvent.getDeviceList();
long timestamp = bluetoothDeviceEvent.getTimestamp();
DeviceProfile deviceProfile = bluetoothDeviceEvent.getDeviceProfile();
switch (bluetoothDeviceEvent.getEventType()) {
case SPACE_ENTERED:
Log.d(TAG, "namespace or region entered");
break;
case DEVICE_DISCOVERED:
Log.d(TAG, "found new beacon");
Log.d(TAG, ((Integer.toString(deviceList.size()))));
String nameOfBeacon = deviceList.get(0).getName();
if(nameOfBeacon.equals("Entrance")) {
long buildingMapID = lookupBuilding(deviceList.get(0).getName());
IndoorsSurfaceFragment indoorsSurfaceFragment = createIndoorFragment(buildingMapID);
getSupportFragmentManager().beginTransaction().replace(R.id.indoorslayout,indoorsSurfaceFragment).commit();
}
break;
MapFragment.xml
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<FrameLayout
android:id="@+id/indoorslayout"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</android.support.v4.widget.NestedScrollView>`
我怎样才能实现这个?我只需要在接收到蓝牙信标事件后加载地图片段。
谢谢。
一直沿着错误的方式在最后两天搜索地图页面每次。再次感谢。 – FireDrakon
还有一个问题。是否有可能用旧的替代一个新的片段?我尝试过这样的事情。 mFragmentList.set(1,newFragment); 但它没有得到更新。我也调用了notifyDataSetChanged()函数。任何理由? – FireDrakon
是的,当你的适配器扩展了'FragmentPagerAdapter'时''notifyDataSetChanged()'总是不起作用。你应该重写'getItemPosition',并返回'POSITION_NONE'。你可以参考:[this](http://stackoverflow.com/questions/10849552/update-viewpager-dynamically) – yanzi1225627