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背景
先看效果图：（以公司附近的国贸为中心点）
上面是地图，下面是地理位置列表，有的只有地理位置列表（QQ动态的位置），这是个很常见的功能。它有个专门的叫法：POI周边搜索。
实现
这个效果实现起来其实很简单，不过需要你先阅读下地图的API，这里使用的是高德地图的Android SDK，SDK的配置这里不作讲解，文末会放一些链接供学习。
思路：
- 利用地图的定位功能，获取用户当前的位置
- 根据获得的位置信息调用POI搜索，获取位置列表
- ListView展示位置列表
- 用户拖动地图，获取地图中心坐标的位置信息，并执行2~3的步骤
代码：
Layout:
Activity:
public class New_LocalActivity extends Activity implements LocationSource,
AMapLocationListener, AMap.OnCameraChangeListener, PoiSearch.OnPoiSearchListener {
@BindView(R.id.map_local)
MapView mapView;
@BindView(R.id.map_list)
ListView mapList;
public static final String KEY_LAT = "lat";
public static final String KEY_LNG = "lng";
public static final String KEY_DES = "des";
private AMapLocationClient mLocationClient;
private LocationSource.OnLocationChangedListener mListener;
private LatLng latlng;
private String city;
private AMap aMap;
private String deepType = "";
private PoiSearch.Query query;
private PoiSearch poiSearch;
private PoiResult poiResult;
private PoiOverlay poiOverlay;
private List poiItems;
private PoiSearch_adapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new__local);
ButterKnife.bind(this);
mapView.onCreate(savedInstanceState);
init();
}
private void init() {
if (aMap == null) {
aMap = mapView.getMap();
aMap.setOnCameraChangeListener(this);
setUpMap();
}
deepType = "餐饮";
}
private void setUpMap() {
if (mLocationClient == null) {
mLocationClient = new AMapLocationClient(getApplicationContext());
AMapLocationClientOption mLocationOption = new AMapLocationClientOption();
mLocationClient.setLocationListener(this);
mLocationOption.setOnceLocation(true);
mLocationOption.setLocationMode(AMapLocationClientOption.AMapLocationMode.Hight_Accuracy);
mLocationClient.setLocationOption(mLocationOption);
mLocationClient.startLocation();
}
MyLocationStyle myLocationStyle = new MyLocationStyle();
myLocationStyle.myLocationIcon(BitmapDescriptorFactory
.fromResource(R.drawable.location_marker));
myLocationStyle.strokeColor(Color.BLACK);
myLocationStyle.radiusFillColor(Color.argb(100, 0, 0, 180));
myLocationStyle.strokeWidth(1.0f);
aMap.setMyLocationStyle(myLocationStyle);
aMap.setLocationSource(this);
aMap.getUiSettings().setMyLocationButtonEnabled(true);
aMap.setMyLocationEnabled(true);
}
/**
* 开始进行poi搜索
*/
protected void doSearchQuery() {
aMap.setOnMapClickListener(null);
int currentPage = 0;
query = new PoiSearch.Query("", deepType, city);
query.setPageSize(20);
query.setPageNum(currentPage);
LatLonPoint lp = new LatLonPoint(latlng.latitude, latlng.longitude);
poiSearch = new PoiSearch(this, query);
poiSearch.setOnPoiSearchListener(this);
poiSearch.setBound(new PoiSearch.SearchBound(lp, 5000, true));
poiSearch.searchPOIAsyn();
}
@Override
public void onLocationChanged(AMapLocation aMapLocation) {
if (mListener != null && aMapLocation != null) {
if (aMapLocation.getErrorCode() == 0) {
mListener.onLocationChanged(aMapLocation);
latlng = new LatLng(aMapLocation.getLatitude(), aMapLocation.getLongitude());
aMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latlng, 14), 1000, null);
city = aMapLocation.getProvince();
doSearchQuery();
} else {
String errText = "定位失败," + aMapLocation.getErrorCode() + ": " + aMapLocation.getErrorInfo();
Log.e("AmapErr", errText);
}
}
}
@Override
public void activate(OnLocationChangedListener listener) {
mListener = listener;
mLocationClient.startLocation();
}
@Override
public void deactivate() {
mListener = null;
if (mLocationClient != null) {
mLocationClient.stopLocation();
mLocationClient.onDestroy();
}
mLocationClient = null;
}
@Override
public void onCameraChange(CameraPosition cameraPosition) {
}
@Override
public void onCameraChangeFinish(CameraPosition cameraPosition) {
latlng = cameraPosition.target;
aMap.clear();
aMap.addMarker(new MarkerOptions().position(latlng));
doSearchQuery();
}
@Override
public void onPoiSearched(PoiResult result, int rCode) {
if (rCode == 0) {
if (result != null && result.getQuery() != null) {
if (result.getQuery().equals(query)) {
poiResult = result;
poiItems = poiResult.getPois();
List suggestionCities = poiResult
.getSearchSuggestionCitys();
if (poiItems != null && poiItems.size() > 0) {
adapter = new PoiSearch_adapter(this, poiItems);
mapList.setAdapter(adapter);
mapList.setOnItemClickListener(new mOnItemClickListener());
}
}
else {
Logger.d("无结果");
}
}
} else {
Logger.e("无结果");
}
} else if (rCode == 27) {
Logger.e("error_network");
} else if (rCode == 32) {
Logger.e("error_key");
} else {
Logger.e("error_other：" + rCode);
}
}
@Override
public void onPoiItemSearched(PoiItem poiItem, int i) {
}
@Override
protected void onResume() {
super.onResume();
mLocationClient.startLocation();
}
@Override
protected void onPause() {
super.onPause();
mLocationClient.stopLocation();
}
@Override
protected void onDestroy() {
mLocationClient.onDestroy();
super.onDestroy();
}
private class mOnItemClickListener implements AdapterView.OnItemClickListener {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
Intent intent = new Intent();
intent.putExtra(KEY_LAT, poiItems.get(position).getLatLonPoint().getLatitude());
intent.putExtra(KEY_LNG, poiItems.get(position).getLatLonPoint().getLongitude());
intent.putExtra(KEY_DES, poiItems.get(position).getTitle());
setResult(RESULT_OK, intent);
finish();
}
}示例中的Activity是使用startActivityForResult方式启动的，最后点击位置之后会返回点选的位置信息。
总结
我第一次准备实现上述的效果时，也是不知所措，因为还没有对地图API有比较全面的认识，后来看了不少资料，自己便结合了一下地图的功能点，实现了设计图中的效果。
下面是一些资料，初学者务必先学习基础API的应用：
如果你有什么问题，可以在博客上留言。
PS:
