Android - 单击列表视图项目时将位置固定到地图？

Question

我有一个包含几个出租车公司的列表视图。当用户点击出租车名称时，它会显示一个警报对话框，要求他们预订、显示地图或取消。我试图实现的是，当用户单击“显示地图”时，它会从已设置的字符串数组中获取位置，然后在地图上指向它。我还不希望它找到我当前的位置。这可能吗？我已经有一个地图视图设置，目前仅指向教程中设置的随机位置。

这是我的代码：

    ListTaxi Class : 

             class Taxi {
    private String taxiName;
    private String taxiAddress;
    private String taxiDist;

    public String getName() {
        return taxiName;
    }

    public void setName(String name) {
        taxiName = name;
    }

    public String getAddress() {
        return taxiAddress;
    }

    public void setAddress(String address) {
        taxiAddress = address;
    }
    public String getDist() {
        return taxiDist;
    }
    public void setDist(String dist){
        taxiDist = dist;
    }
    public Taxi(String name, String address, String dist) {
        taxiName = name;
        taxiAddress = address;
        taxiDist = dist;
    }
}

public class TaxiAdapter extends ArrayAdapter<Taxi> {
    private ArrayList<Taxi> items;
    private TaxiViewHolder taxiHolder;

    private class TaxiViewHolder {
        TextView name;
        TextView address; 
        TextView dist;
    }

    public TaxiAdapter(Context context, int tvResId, ArrayList<Taxi> items) {
        super(context, tvResId, items);
        this.items = items;
    }

    @Override
    public View getView(int pos, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.taxi_list_item, null);
            taxiHolder = new TaxiViewHolder();
            taxiHolder.name = (TextView)v.findViewById(R.id.taxi_name);
            taxiHolder.address = (TextView)v.findViewById(R.id.taxi_address);
            taxiHolder.dist = (TextView)v.findViewById(R.id.taxi_dist);
            v.setTag(taxiHolder);
        } else taxiHolder = (TaxiViewHolder)v.getTag(); 

        Taxi taxi = items.get(pos);

        if (taxi != null) {
            taxiHolder.name.setText(taxi.getName());
            taxiHolder.address.setText(taxi.getAddress());
            taxiHolder.dist.setText(taxi.getDist());
        }

        return v;
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listtaxi);

    final String[] taxiNames = getResources().getStringArray(R.array.taxi_name_array);
    final String[] taxiAddresses = getResources().getStringArray(R.array.taxi_address_array);
    final String[] taxiDist = getResources().getStringArray(R.array.taxi_array_dist);
    ArrayList<Taxi> taxiList = new ArrayList<Taxi>();

    for (int i = 0; i < taxiNames.length; i++) {
        taxiList.add(new Taxi(taxiNames[i], taxiAddresses[i], taxiDist[i]));

    }


    setListAdapter(new TaxiAdapter(this, R.layout.taxi_list_item, taxiList));  

    final ListView lv = getListView();
    lv.setTextFilterEnabled(true);

        lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> a, View v, final int position, long id)
        {       

            final int selectedPosition = position;
            AlertDialog.Builder adb=new AlertDialog.Builder(ListTaxi.this); 
             adb.setTitle("Taxi Booking");
             adb.setMessage("You Have Selected: "+taxiNames[selectedPosition]); 
             adb.setPositiveButton("Book", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int id) {
                     Intent intent = new Intent(ListTaxi.this, Booking.class);
                     intent.putExtra("booking",  taxiNames[selectedPosition]);
                     intent.putExtra("address",  taxiAddresses[selectedPosition]);
                     intent.putExtra("distance", taxiDist[selectedPosition]);
                     startActivity(intent);
                 }
             });
             adb.setNeutralButton("Show Map", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int id) {
                     Intent intent = new Intent(ListTaxi.this, Map.class);
                     startActivity(intent);
                 }
             });

             adb.setNegativeButton("Cancel", null); 
             adb.show();
         }
     });     
}

}

我的地图类是： /** * */ 包 com.taxime;

    public class Map extends MapActivity{
LinearLayout linearLayout;
MapView mapView;
List<Overlay> mapOverlays;
Drawable drawable;
ItemizedOverlay itemizedOverlay;


public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mapviews);

        mapView = (MapView) findViewById(R.id.mapView);
        mapView.setBuiltInZoomControls(true);



        mapOverlays = mapView.getOverlays();
        drawable = this.getResources().getDrawable(R.drawable.androidmarker);
        itemizedOverlay = new ItemizedOverlay(drawable);

        Intent intent = getIntent();
        if (intent != null) {
            if (Intent.ACTION_VIEW.equals(intent.getAction())) {
                if (intent.getData() != null) {
                    int selectedPosition = Integer.parseInt(intent.getData().getHost());
                    GeoPoint point = new GeoPoint(selectedPosition, selectedPosition);

                    OverlayItem overlayitem = new OverlayItem(point, "", "");
                    itemizedOverlay.addOverlay(overlayitem);
                    mapOverlays.add(itemizedOverlay);

                    //...
                }
            }
        }

我的字符串也来自：

    <string-array name="taxi_name_array">
    <item>Barrys Taxi</item>
    <item>Boom Taxi</item>

</string-array>

<string-array name="taxi_address_array">
<item>24 test address, Uxbridge, UB8 2JY</item>
<item>14 test 2 address, Uxbridge, UB91JD</item>
</string-array>
<string-array name = "taxi_array_dist">
<item>0.4 miles</item>
<item>0.8 miles</item>
</string-array>
<string-array name ="location">
<item>(19240000,-99120000)</item>
</string-array>

如果有人有任何想法，那就太棒了。

再次感谢大家

Answer 1

您可以做的是使用意图的数据字段将单击的出租车项目的位置传递给地图活动。为此，在“地图”按钮的 onClick 处理程序内，使用带有四个参数的 Intent 构造函数：

adb.setNeutralButton("Show Map", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("taxi:" + selectedPosition), ListTaxi.this, Map.class);
        startActivity(intent);
    }
});

然后，在地图活动内，调用 < href="http://developer.android.com/reference/android/app/Activity.html#getIntent%28%29" rel="nofollow">getIntent 方法检索启动它的Intent。调用 getData在意图上检索数据字段。

将所有内容放在一起，您将在地图活动的 onCreate 重写中看到如下内容：

Intent intent = getIntent();
if (intent != null) {
    if (Intent.ACTION_VIEW.equals(intent.getAction())) {
        if (intent.getData() != null) {
            int selectedPosition = Integer.parseInt(intent.getData().getHost());
            String[] taxiLocations = getResources().getStringArray(R.array.location);
            String location = taxiLocations[selectedPosition];
            //...
        }
    }
}

Answer 2

您的意思是您有一个地址并且需要纬度/经度来设置地图？也许是这样的：

    Geocoder gc = new Geocoder(this.getApplicationContext()) ;
    List<Address> addresses = null ;

    try {
       addresses = gc.getFromLocationName("123 Main St, Peoria IL 61601", 10) ;
    } catch (IOException e) {
       // TODO Auto-generated catch block
       e.printStackTrace();
    }

    Address a = addresses.get(0) ;
    double lat = a.getLatitude() ;
    double lon = a.getLongitude() ;

    MapController mc = mapView.getController();

    p = new GeoPoint(
        (int) (lat * 1E6), 
        (int) (lon * 1E6));

    mc.animateTo(p);
    mc.setZoom(18);
    mapView.invalidate();