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如果 GPS 离线，我想要一个 GUI，以便用户可以输入当前地址。

我正在使用 Google 地图在 Eclipse 中构建一个 Android 应用程序。我的一项活动在打开时会显示一个地图视图。我想做的是如果 GPS 没有打开而不是加载地图我希望活动显示一个 EditText 文本视图，用户可以在其中输入他们当前位置的地址，然后地图视图会在输入后显示这个地址。我拥有所有逻辑来获取 GPS 布尔值以显示 GPS 是否打开，但我真正需要的是 Activity.java 和布局 xml 逻辑，它们将基于 GPS 开启显示这些 GUI 项目中的任何一个。因此，如果 GPS 在地图视图上将显示，如果 GPS 不在活动上，将显示一个区域以输入地址和一个按钮，一旦单击该按钮，此逻辑将在地图视图上显示用户输入的位置.

活动.java 文件

 @SuppressLint("ShowToast")
      public class MapViewActivity extends FragmentActivity {
            static LatLng currentLatLng;
            LatLng currentLocation;
            private GoogleMap map;
            boolean firstPass = true;
            double currentLat;
            double currentlong;


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

    LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    boolean isGPS = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);

    showCurrentLocationOnMap(); 
    try {
        showSheltersAndFuelStops();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}
//This will change when SQL connection string is implemented.
private void showSheltersAndFuelStops() throws IOException {
    List<McDonalds> mcdList = new ArrayList<McDonalds>();
    List<Subway> subwayList = new ArrayList<Subway>();
    String subwayRoswell1 = "1307 N Main St, Roswell, NM, 88203";
    String subwayRoswell2 = "1701 W Second St, Roswell, NM, 88201";
    String subwayLC1 = "2001 E Lohman, Las Cruces, NM, 88001";
    String subwayLC2 = "2821 N Telshor, Las Cruces, NM 88011";
    String mcdonaldsRoswell1 = "720 N Main St, Roswell, NM, 88201";
    String mcdonaldsRoswell2 = "1804 S Main St, Roswell, NM, 88203";
    String mcdonaldsLC1 = "4810 Mesa Grande, Las Cruces, NM, 88012";
    String mcdonaldsLC2 = "571 Walton Blvd, Las Cruces, NM, 88001";

    Subway subway = new Subway(" 1307 N Main St, Roswell, NM, 88203", 1.58, 8.0);
    subwayList.add(subway);
    Subway subway1 = new Subway(" 1701 W Second St, Roswell, NM, 88201", 2.47, 12.0);
    subwayList.add(subway1);
    Subway subsLC = new Subway(" 2001 E Lohman, Las Cruces, NM, 88001", 147.99, 185.0);
    subwayList.add(subsLC);
    Subway subsLC1 = new Subway(" 2821 N Telshor Drive, Las Cruces, NM, 88011", 147.12, 200.0);
    subwayList.add(subsLC1);

    //This will be replaced by a Read Only Stored procedure that gets the List of Shelters
    McDonalds mcdonalds = new McDonalds(" 720 N Main St, Roswell, NM, 88201", 1.08, 8.0);
    mcdList.add(mcdonalds);
    McDonalds mcdonalds1 = new McDonalds(" 1804 S Main St, Roswell, NM, 88203", 2.9, 12.0);
    mcdList.add(mcdonalds1);
    McDonalds mcdonaldslc = new McDonalds(" 4810 Mesa Grande, Las Cruces, NM, 88012", 143.2, 185.0);
    mcdList.add(mcdonaldslc);
    McDonalds mcdonaldslc1 = new McDonalds(" 571 Walton Blvd, Las Cruces, NM, 88001", 147.62, 200.0);
    mcdList.add(mcdonaldslc1);

    showFuelStops(subwayRoswell1);
    showFuelStops(subwayRoswell2);
    showFuelStops(subwayLC1);
    showFuelStops(subwayLC2);
    showShelters(mcdonaldsRoswell1);
    showShelters(mcdonaldsRoswell2);
    showShelters(mcdonaldsLC1);
    showShelters(mcdonaldsLC2);
}


private void showFuelStops(String location) throws IOException{
    Geocoder geocoder = new Geocoder(this, Locale.getDefault());  
    List<Address> addresses;

    addresses = geocoder.getFromLocationName(location, 1);
    if(addresses.size() > 0) {
        BitmapDescriptor subwayBitmapDescriptor = BitmapDescriptorFactory.fromResource(R.drawable.fillingstation);
        currentLat= addresses.get(0).getLatitude();
        currentlong= addresses.get(0).getLongitude();
        LatLng subLoc = new LatLng(currentLat, currentlong);
        Marker fuelMarker = map.addMarker(new MarkerOptions().position(subLoc).icon(subwayBitmapDescriptor).title("Subway, " + location));

    }       
}

private void showShelters(String location) throws IOException{
    Geocoder geocoder = new Geocoder(this, Locale.getDefault());  
    List<Address> addresses;

    addresses = geocoder.getFromLocationName(location, 1);
    if(addresses.size() > 0) {
        BitmapDescriptor subwayBitmapDescriptor = BitmapDescriptorFactory.fromResource(R.drawable.shelter);
        double latitude= addresses.get(0).getLatitude();
        double longitude= addresses.get(0).getLongitude();
        LatLng subLoc = new LatLng(latitude, longitude);
        Marker hamburg = map.addMarker(new MarkerOptions().position(subLoc).icon(subwayBitmapDescriptor).title("McDonalds, " + location));

    }       
}

private void showCurrentLocationOnMap(){
    LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    SupportMapFragment mf= (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);

    map = mf.getMap();
    //map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
    LocationListener ll = new Mylocationlistener();
    boolean isGPS = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);

    if (!isGPS){
        Intent intent = new Intent("android.location.GPS_ENABLED_CHANGE");
        intent.putExtra("enabled", true);
        sendBroadcast(intent);
    }

    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 10, ll);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.map_view, menu);
    return true;
}
/**
 *Mylocationlistener class will give the current GPS location 
 *with the help of Location Listener interface 
 */
private class Mylocationlistener implements LocationListener {
    private boolean zoomed = false;
    @Override
    public void onLocationChanged(Location location) {

        if (location != null) {
            // ---Get current location latitude, longitude---

            Log.d("LOCATION CHANGED", location.getLatitude() + "");
            Log.d("LOCATION CHANGED", location.getLongitude() + "");
            currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
            currentLatLng = new LatLng(location.getLatitude(), location.getLongitude());
            Marker currentLocationMarker = map.addMarker(new MarkerOptions().position(currentLocation).title("Current Location"));
            // Move the camera instantly to hamburg with a zoom of 15.
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 15));
            // Zoom in, animating the camera.
            if (!zoomed) {
                map.animateCamera(CameraUpdateFactory.zoomTo(12), 2000, null);
                zoomed = true;
            }
            if (!firstPass){
                currentLocationMarker.remove();
            }
            firstPass = false;
            Toast.makeText(MapViewActivity.this,"Latitude = "+
                    location.getLatitude() + "" +"Longitude = "+ location.getLongitude(),
                    Toast.LENGTH_LONG).show();

        } else {

        }
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

  }

活动地图.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <fragment
         android:name="com.google.android.gms.maps.SupportMapFragment"
         android:id="@+id/map"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 </LinearLayout>

基于我在 Activity.java 文件中设置的 isGPS 布尔值，我可以将其用作布尔值开关。有没有办法根据需要更改 gui？

4

2 回答 2

0

你能告诉我如果用户输入地址会发生什么吗？它应该显示在地图上吧？但是为此，您需要获得相应的LatLng点。为此，您需要访问GPS service或至少访问网络服务以获取坐标。

于 2013-04-03T07:21:16.727 回答
0

当然有！只需根据 GPS 状态切换地图/编辑视图的可见性。例如，您可以让地图默认不可见，如下所示：

<fragment
         android:name="com.google.android.gms.maps.SupportMapFragment"
         android:id="@+id/map"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:visibility="gone" />
<EditText ...put stuff here... />

然后从您的代码中检查 GPS 是否已打开：

if (gpsIsOn)
{
    mapView.setVisibility(View.VISIBLE);
    editText.setVisibility(View.GONE);
}
于 2013-04-02T20:59:13.060 回答