所以我一直在尝试使用estimote信标,并在他们的教程的帮助下学习如何使用它... 但最后,他们说需要在listview中使用显示散列图... 这是代码: private static final Map> PLACES_BY_BEACONS;
// TODO: replace "<major>:<minor>" strings to match your own beacons.
static {
Map<String, List<String>> placesByBeacons = new HashMap<>();
placesByBeacons.put("29098:1493", new ArrayList<String>() {{
add("Heavenly Sandwiches");
// read as: "Heavenly Sandwiches" is closest
// to the beacon with major 22504 and minor 48827
add("Green & Green Salads");
// "Green & Green Salads" is the next closest
add("Mini Panini");
// "Mini Panini" is the furthest away
}});
placesByBeacons.put("52504:13020", new ArrayList<String>() {{
add("Mini Panini");
add("Green & Green Salads");
add("Heavenly Sandwiches");
}});
PLACES_BY_BEACONS = Collections.unmodifiableMap(placesByBeacons);
}
private List<String> placesNearBeacon(Beacon beacon) {
String beaconKey = String.format("%d:%d", beacon.getMajor(), beacon.getMinor());
if (PLACES_BY_BEACONS.containsKey(beaconKey)) {
return PLACES_BY_BEACONS.get(beaconKey);
}
return Collections.emptyList();
}
private BeaconManager beaconManager;
private Region region;
ListView lv;
Button reserveButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView)findViewById(R.id.listView);
reserveButton=(Button)findViewById(R.id.button);
beaconManager = new BeaconManager(this);
beaconManager.setRangingListener(new BeaconManager.RangingListener() {
@Override
public void onBeaconsDiscovered(Region region, List<Beacon> list) {
if (!list.isEmpty()) {
Beacon nearestBeacon = list.get(0);
List<String> places = placesNearBeacon(nearestBeacon);
// TODO: update the UI here
Log.d("Airport", "Nearest places: " + places);
}
}
});
region = new Region("ranged region",
UUID.fromString("B9407F30-F5F8-466E-AFF9-25556B57FE6D"), null, null);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Message your friends", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
所以我的问题是如何显示我的UI(Listview)中的placesByBeacons对象中的所有内容,这些对象在代码中由lv引用。
答案 0 :(得分:1)
在您的布局中添加ListView
。
将此代码放入onCreate
:
ListView listView = (ListView) findViewById(R.id.listView);
final ArrayAdapter<String> adapter = new ArrayAdapter<>(
this, android.R.layout.simple_list_item_1);
listView.setAdapter(adapter);
这将从您的布局中获取列表视图,并使用适配器为字符串集合设置它,这正是places
的内容。 (它使用Android预定义的布局来显示列表视图中的项目which is actually just a TextView
。)
请注意R.id.listView
,即此代码假定您在步骤1中添加的ListView
标识为listView
。
在&#34; TODO下面:在这里更新用户界面,&#34;添加:
adapter.clear();
adapter.addAll(places);
这将使用信标范围结果生成的最新数据替换列表视图后面的数据。