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Android 基于用户';在SQLite中显示最近的纬度和经度;s位置_Android_Sqlite_Google Maps_Listview_Android Studio - Fatal编程技术网

Android 基于用户';在SQLite中显示最近的纬度和经度;s位置

Android 基于用户';在SQLite中显示最近的纬度和经度;s位置,android,sqlite,google-maps,listview,android-studio,Android,Sqlite,Google Maps,Listview,Android Studio,我创建了一个由谷歌地图和地点列表视图组成的应用程序。地点数据与纬度和经度一起在SQLite中。我决定添加一个按钮,如果用户单击它,附近的位置将根据用户在listview中的位置显示,它将替换以前的listview,标记将显示在地图中。我不知道如何显示附近的位置,一旦我点击一个按钮。在我的项目中,所有地点的列表都已经显示在listview中,一旦用户在列表中选择,地图将自动获得经度的纬度。请帮帮我 public class MainActivity extends AppCompatActivit

我创建了一个由谷歌地图和地点列表视图组成的应用程序。地点数据与纬度和经度一起在SQLite中。我决定添加一个按钮,如果用户单击它,附近的位置将根据用户在listview中的位置显示,它将替换以前的listview,标记将显示在地图中。我不知道如何显示附近的位置,一旦我点击一个按钮。在我的项目中,所有地点的列表都已经显示在listview中,一旦用户在列表中选择,地图将自动获得经度的纬度。请帮帮我

public class MainActivity extends AppCompatActivity implements LocationListener {

    GoogleMap map;

    List<LocationModel> GetLocation;
    Context context = this;
    DatabaseHelper dbhelper;
    DatabaseHelper db = new DatabaseHelper(this);
    ListView lv;
    View yourListView,yourProfileView;
    Button buttonnearby;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dbhelper = new DatabaseHelper(MainActivity.this);


        buttonnearby = (Button) findViewById(R.id.button);
        buttonnearby.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View convertView) {


            }

        });

        try{
            dbhelper.createDataBase();
        }
        catch(IOException e){
            e.printStackTrace();
        }
        try {
            dbhelper.openDataBase();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        GetLocation = dbhelper.getLocation();
        lv = (ListView) findViewById(R.id.listView);
        lv.setAdapter(new ViewAdapter());

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                LatLng latlngtofocus = new LatLng(Double.parseDouble(GetLocation.get(i).getlatitude()),  Double.parseDouble(GetLocation.get(i).getlongitude()));

                map.animateCamera(CameraUpdateFactory.newLatLngZoom(latlngtofocus, 17.0f));

                MarkerOptions markerOptions = new MarkerOptions();
                markerOptions.position(latlngtofocus);
                //adding marker to the map
                map.addMarker(markerOptions);


                yourListView = findViewById(R.id.layout);
                ViewGroup parent = (ViewGroup) yourListView.getParent();
                parent.removeView(yourListView);
// inflate your profile view (or get the reference to it if it's already inflated)
                yourProfileView = getLayoutInflater().inflate(R.layout.profile_location, parent, false);
// add it to the parent
                parent.addView(yourProfileView);

            }


        });



        //To get MapFragment reference from xml layout
        MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);

        //To get map object
        map = mapFragment.getMap();
        map.getUiSettings().setZoomControlsEnabled(true);

       /* //to show current location in the map
        map.setMyLocationEnabled(true);

        map.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
            @Override
            public void onMapClick(LatLng latLng) {

                Toast.makeText(getApplicationContext(), latLng.toString(), Toast.LENGTH_LONG).show();
            }
        });*/

        //To setup location manager
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        //To request location updates
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, 1, this);

    }


    @Override
    public void onLocationChanged(Location location) {

        //To clear map data
        map.clear();

        //To hold location
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());

        //To create marker in map
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("My Location");
        //adding marker to the map
        map.addMarker(markerOptions);

        //opening position with some zoom level in the map
        map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 17.0f));
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

    /****************************************************************************************
     *                                      CUSTOM LIST
     ****************************************************************************************/
    public class ViewAdapter extends BaseAdapter {

        LayoutInflater mInflater;

        public ViewAdapter() {
            mInflater = LayoutInflater.from(context);
        }

        @Override
        public int getCount() {
            return GetLocation.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {

            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.item_location,null);
            }

            final TextView place = (TextView) convertView.findViewById(R.id.location);
            final TextView latitude = (TextView) convertView.findViewById(R.id.latitude);
            final TextView longitude = (TextView) convertView.findViewById(R.id.longitude);

            location.setText(GetLocation.get(position).getlocation());
            latitude.setText(GetLocation.get(position).getlatitude());
            longitude.setText(GetLocation.get(position).getlongitude());

            return convertView;
        }
    }

    @Override
    public void onBackPressed() {
        if(yourProfileView != null && yourProfileView.getParent() != null) {
            // remove your profile view
            ViewGroup parent = (ViewGroup) yourProfileView.getParent();
            parent.removeView(yourProfileView);

            // a reference to yourListView has to be saved somewhere; just get it

            // add your listview to the parent
            parent.addView(yourListView);
        } else {
            super.onBackPressed();
        }
    }

}
public类MainActivity扩展AppCompatActivity实现LocationListener{
谷歌地图;
列出位置;
上下文=这个;
数据库助手dbhelper;
DatabaseHelper db=新的DatabaseHelper(此);
ListView lv;
查看您的列表视图、个人资料视图;
按钮按钮任意;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbhelper=newdatabasehelper(MainActivity.this);
buttonnearby=(按钮)findViewById(R.id.Button);
ButtonnerBy.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图转换视图){
}
});
试一试{
dbhelper.createDataBase();
}
捕获(IOE异常){
e、 printStackTrace();
}
试一试{
dbhelper.openDataBase();
}捕获(SQLE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
GetLocation=dbhelper.GetLocation();
lv=(ListView)findViewById(R.id.ListView);
lv.setAdapter(新的ViewAdapter());
lv.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
公共无效onItemClick(AdapterView AdapterView、View视图、int i、long l){
LatLng latlngtofocus=新LatLng(Double.parseDouble(GetLocation.get(i.getlatitude()),Double.parseDouble(GetLocation.get(i.getlatitude());
map.animateCamera(CameraUpdateFactory.newLatLngZoom(latlngtofocus,17.0f));
MarkerOptions MarkerOptions=新MarkerOptions();
标记选项位置(latlngtofocus);
//向地图添加标记
map.addMarker(markerOptions);
yourListView=findviewbyd(R.id.layout);
ViewGroup parent=(ViewGroup)yourListView.getParent();
parent.removeView(yourListView);
//为纵断面图充气(如果已经充气,则获取其参考)
yourProfileView=GetLayoutFlater()。充气(R.layout.profile\u位置,父项,false);
//将其添加到父级
parent.addView(yourProfileView);
}
});
//从xml布局获取MapFragment引用
MapFragment MapFragment=(MapFragment)getFragmentManager().findFragmentById(R.id.map);
//获取地图对象的步骤
map=mapFragment.getMap();
map.getUiSettings().setZoomControlsEnabled(true);
/*//在地图中显示当前位置
map.setMyLocationEnabled(true);
setOnMapClickListener(新的GoogleMap.OnMapClickListener(){
@凌驾
公共无效的点击(LatLng LatLng){
Toast.makeText(getApplicationContext(),latLng.toString(),Toast.LENGTH\u LONG.show();
}
});*/
//设置位置管理器的步骤
LocationManager LocationManager=(LocationManager)getSystemService(Context.LOCATION\u服务);
//请求位置更新
locationManager.RequestLocationUpdate(locationManager.NETWORK\u提供程序,1,1,此);
}
@凌驾
已更改位置上的公共无效(位置){
//清除地图数据的步骤
map.clear();
//保留位置
LatLng LatLng=新LatLng(location.getLatitude(),location.getLongitude());
//在地图中创建标记的步骤
MarkerOptions MarkerOptions=新MarkerOptions();
标记选项位置(板条);
markerOptions.title(“我的位置”);
//向地图添加标记
map.addMarker(markerOptions);
//在地图中具有一定缩放级别的打开位置
map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng,17.0f));
}
@凌驾
public void onStatusChanged(字符串提供程序、int状态、Bundle extra){
}
@凌驾
公共无效onProviderEnabled(字符串提供程序){
}
@凌驾
公共无效onProviderDisabled(字符串提供程序){
}
/****************************************************************************************
*自定义列表
****************************************************************************************/
公共类ViewAdapter扩展了BaseAdapter{
拉平机;
公共视图适配器(){
mInflater=LayoutInflater.from(上下文);
}
@凌驾
public int getCount(){
返回GetLocation.size();
}
@凌驾
公共对象getItem(int位置){
返回null;
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
if(convertView==null){
convertView=mInflater.充气(右布局.项目位置,空);
}
最终TextView位置=(TextView)convertView.findViewById(R.id.location);
最终文本视图纬度=(文本视图)convertView.findViewById(R.id.latitude);
最终文本视图longi
public List<LocationModel> getLocation() {


        List<LocationModel> lList = new ArrayList<LocationModel>();
        {
            String selectQuery =
                    "SELECT id,location,latitude,longitude FROM places ";
            Log.e("places query: ", selectQuery);
            SQLiteDatabase db = this.getWritableDatabase();
            Cursor cursor = db.rawQuery(selectQuery, null);

            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
                    LocationModel lm = new LocationModel();
                    lm.setid(Integer.parseInt(cursor.getString(0)));
                    lm.setlocation(cursor.getString(1));
                    lm.setlatitude(cursor.getString(2));
                    lm.setlongitude(cursor.getString(3));

                    lList.add(lm);
                } while (cursor.moveToNext());
            }
            db.close();
        }
        return lList;
    }
}
public static double geoCoordToMeter(double latA, double lonA, double latB, double lonB) {
    double earthRadius = 6378.137d; // km
    double dLat = (latB - latA) * Math.PI / 180d;
    double dLon = (lonB - lonA) * Math.PI / 180d;
    double a = Math.sin(dLat / 2d) * Math.sin(dLat / 2d)
               + Math.cos(latA * Math.PI / 180d)
                 * Math.cos(latB * Math.PI / 180d)
                 * Math.sin(dLon / 2d) * Math.sin(dLon / 2);
    double c = 2d * Math.atan2(Math.sqrt(a), Math.sqrt(1d - a));
    double d = earthRadius * c;
    return (d * 1000d);
}
private int mMinValue = 10000; // field (member which stores the lowest..)

private checkMin(int newMin){
           if(mMinValue < newMin) mMinValue = newMin;
    }
float [] distResult = new float[1];
Location.distanceBetween(latA, lonA, latB, lonB, distResult);
float dist = distResult[0];