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在我的应用程序中，我要求用户在自动完成文本框中输入一个位置，我能够从 JSON 对象成功获取位置，并且我成功地提取了经度和纬度并为这些位置创建了一个 GeoPoint。我在为所需的 GeoPoint 创建覆盖项时遇到问题。

以下是我在 SiteOverlay 构造函数中的 ItemziedOverlay 类的代码，我正在使用新的位置覆盖来绘制和调用 populate() 但没有成功，它一直说 Null 点 ItemizedOverlay。

private class SitesOverlay extends ItemizedOverlay<OverlayItem> {

    private Drawable marker = null;
    private OverlayItem inDrag = null;
    private ImageView dragImage = null;
    private int xDragImageOffset = 0;
    private int yDragImageOffset = 0;
    private int xDragTouchOffset = 0;
    private int yDragTouchOffset = 0;

    public SitesOverlay(Drawable marker) {
        super(marker);
        this.marker = marker;

        dragImage = (ImageView) findViewById(R.id.drag);
        xDragImageOffset = dragImage.getDrawable().getIntrinsicWidth() / 2;
        yDragImageOffset = dragImage.getDrawable().getIntrinsicHeight();

        // items.add(new OverlayItem(getPoint(24.893379, 67.028061),
        // "Karachi", "Sindh, Pakistan"));

    }

    public SitesOverlay(Drawable marker, OverlayItem newlocationItem) {
        super(marker);
        this.marker = marker;

        dragImage = (ImageView) findViewById(R.id.drag);
        xDragImageOffset = dragImage.getDrawable().getIntrinsicWidth() / 2;
        yDragImageOffset = dragImage.getDrawable().getIntrinsicHeight();

        // items.add(new OverlayItem(getPoint(24.893379, 67.028061),
        // "Karachi", "Sindh, Pakistan"));

        items.add(newlocationItem);
        populate();

    }

    @Override
    protected boolean onTap(int index) {
        // TODO Auto-generated method stub

        OverlayItem item = items.get(index);
        AlertDialog.Builder dialog = new AlertDialog.Builder(
                getApplicationContext());
        dialog.setTitle(item.getTitle());
        dialog.setMessage(item.getSnippet());
        dialog.show();

        return super.onTap(index);
    }

    @Override
    protected OverlayItem createItem(int i) {
        return (items.get(i));
    }

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        super.draw(canvas, mapView, shadow);

        boundCenterBottom(marker);
    }

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

    @Override
    public boolean onTouchEvent(MotionEvent event, MapView mapView) {
        final int action = event.getAction();
        final int x = (int) event.getX();
        final int y = (int) event.getY();
        boolean result = false;

        if (action == MotionEvent.ACTION_DOWN) {
            for (OverlayItem item : items) {
                Point p = new Point(0, 0);

                map.getProjection().toPixels(item.getPoint(), p);

                if (hitTest(item, marker, x - p.x, y - p.y)) {
                    result = true;
                    inDrag = item;
                    items.remove(inDrag);
                    populate();

                    xDragTouchOffset = 0;
                    yDragTouchOffset = 0;

                    setDragImagePosition(p.x, p.y);
                    dragImage.setVisibility(View.VISIBLE);

                    xDragTouchOffset = x - p.x;
                    yDragTouchOffset = y - p.y;

                    break;
                }
            }
        } else if (action == MotionEvent.ACTION_MOVE && inDrag != null) {
            setDragImagePosition(x, y);
            result = true;
        } else if (action == MotionEvent.ACTION_UP && inDrag != null) {
            dragImage.setVisibility(View.GONE);

            GeoPoint pt = map.getProjection().fromPixels(
                    x - xDragTouchOffset, y - yDragTouchOffset);
            OverlayItem toDrop = new OverlayItem(pt, inDrag.getTitle(),
                    inDrag.getSnippet());
            Toast.makeText(
                    MainActivity.this,
                    "Latitude " + pt.getLatitudeE6() + "," + " "
                            + "Longitude " + pt.getLongitudeE6(),
                    Toast.LENGTH_SHORT).show();
            items.add(toDrop);
            populate();

            inDrag = null;
            result = true;

            /*
             * //--- Get the name of the location by Longitude and
             * latitude--- Geocoder geoCoder = new
             * Geocoder(getBaseContext(), Locale.getDefault()); try {
             * List<Address> addresses = geoCoder.getFromLocation(
             * pt.getLatitudeE6() / 1E6, pt.getLongitudeE6() / 1E6, 1);
             * String add = ""; if (addresses.size() > 0) { for (int i=0;
             * i<addresses.get(0).getMaxAddressLineIndex(); i++) add +=
             * addresses.get(0).getAddressLine(i) + "\n"; }
             * Toast.makeText(getBaseContext(), add,
             * Toast.LENGTH_SHORT).show();
             * 
             * } catch (IOException e) { e.printStackTrace(); }
             */

        }

        return (result || super.onTouchEvent(event, mapView));
    }

    private void setDragImagePosition(int x, int y) {
        RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) dragImage
                .getLayoutParams();

        lp.setMargins(x - xDragImageOffset - xDragTouchOffset, y
                - yDragImageOffset - yDragTouchOffset, 0, 0);
        dragImage.setLayoutParams(lp);
    }

}

class GetPlaces extends AsyncTask<String, Void, ArrayList<String>> {

    @Override
    // three dots is java for an array of strings
    protected ArrayList<String> doInBackground(String... args) {

        Log.d("gottaGo", "doInBackground");

        ArrayList<String> predictionsArr = new ArrayList<String>();

        try {

            URL googlePlaces = new URL(
                    // URLEncoder.encode(url,"UTF-8");
                    "https://maps.googleapis.com/maps/api/place/autocomplete/json?input="
                            + URLEncoder.encode(args[0].toString(), "UTF-8")
                            + "&types=geocode&language=en&sensor=true&key=AIzaSyBBILczt124ZWZHlSYsB6hb_Fqjb2nFEaE");
            URLConnection tc = googlePlaces.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    tc.getInputStream()));

            String line;
            StringBuffer sb = new StringBuffer();
            // take Google's legible JSON and turn it into one big string.
            while ((line = in.readLine()) != null) {
                sb.append(line);
            }
            // turn that string into a JSON object
            JSONObject predictions = new JSONObject(sb.toString());
            // now get the JSON array that's inside that object
            JSONArray ja = new JSONArray(
                    predictions.getString("predictions"));

            for (int i = 0; i < ja.length(); i++) {
                JSONObject jo = (JSONObject) ja.get(i);
                // add each entry to our array
                predictionsArr.add(jo.getString("description"));
            }
        } catch (IOException e) {

            Log.e("YourApp", "GetPlaces : doInBackground", e);

        } catch (JSONException e) {

            Log.e("YourApp", "GetPlaces : doInBackground", e);

        }

        return predictionsArr;

    }

    // then our post

    @Override
    protected void onPostExecute(ArrayList<String> result) {

        Log.d("YourApp", "onPostExecute : " + result.size());
        // update the adapter
        adapter = new ArrayAdapter<String>(getBaseContext(),
                R.layout.item_list);
        adapter.setNotifyOnChange(true);
        // attach the adapter to textview
        textView.setAdapter(adapter);

        for (String string : result) {

            Log.d("YourApp", "onPostExecute : result = " + string);
            adapter.add(string);
            adapter.notifyDataSetChanged();

        }

        Log.d("YourApp",
                "onPostExecute : autoCompleteAdapter" + adapter.getCount());

    }

}

我的活动代码

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.net.URL;
    import java.net.URLConnection;
    import java.net.URLEncoder;
    import java.util.ArrayList;
    import java.util.List;
    import org.apache.http.HttpEntity;
    import org.apache.http.HttpResponse;
    import org.apache.http.client.ClientProtocolException;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.json.JSONArray;
    import org.json.JSONException;
    import org.json.JSONObject;
    import android.app.AlertDialog;
    import android.graphics.Canvas;
    import android.graphics.Point;
    import android.graphics.drawable.Drawable;
    import android.os.AsyncTask;
    import android.os.Bundle;
    import android.text.Editable;
    import android.text.TextWatcher;
    import android.util.Log;
    import android.view.KeyEvent;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.MotionEvent; 
    import android.view.View;
    import android.widget.ArrayAdapter;
    import android.widget.AutoCompleteTextView;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.RelativeLayout;
   import android.widget.Toast;
   import com.google.android.maps.GeoPoint;
   import com.google.android.maps.ItemizedOverlay;
   import com.google.android.maps.MapActivity;
   import com.google.android.maps.MapController;
   import com.google.android.maps.MapView;
   import com.google.android.maps.MyLocationOverlay;
   import com.google.android.maps.OverlayItem;

   public class MainActivity extends MapActivity {
private MapView map = null;
private MyLocationOverlay me = null;
Button btn_Go;
Drawable marker;
EditText txtSearch;

AutoCompleteTextView textView;

private static final String API_KEY = "0f7ZWSUbQaZNR9_csQVFdRHpjnARCHAR1WbkFAQ";
ArrayAdapter<String> adapter;

private List<OverlayItem> items = new ArrayList<OverlayItem>();

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

    map = (MapView) findViewById(R.id.map);
    btn_Go = (Button) findViewById(R.id.BtnSearch);

    // txtSearch = (EditText) findViewById(R.id.txt_searchbox);
    // Set the default Location of push pin
    map.getController().setCenter(getPoint(24.893379, 67.028061));
    map.setBuiltInZoomControls(true);

    marker = getResources().getDrawable(R.drawable.pushpin);

    marker.setBounds(0, 0, marker.getIntrinsicWidth(),
            marker.getIntrinsicHeight());

    map.getOverlays().add(new SitesOverlay(marker));

    me = new MyLocationOverlay(this, map);

    map.getOverlays().add(me);

    adapter = new ArrayAdapter<String>(this, R.layout.item_list);
    textView = (AutoCompleteTextView) findViewById(R.id.txtSearchBox);
    adapter.setNotifyOnChange(true);
    textView.setAdapter(adapter);
    textView.addTextChangedListener(new TextWatcher() {

        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            if (count % 3 == 1) {
                adapter.clear();
                GetPlaces task = new GetPlaces();
                // now pass the argument in the textview to the task
                task.execute(textView.getText().toString());
            }
        }

        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        public void afterTextChanged(Editable s) {

        }

    });

}

public void GoTolocation(View v) {

    String value = textView.getText().toString();
    // Do something with value!
    Log.d("value", value);
    MapController mc = map.getController();
    JSONObject Response = getLocationInfo(value);
    GeoPoint p = getGeoPoint(Response);
    // map.getOverlays().remove(0);
    // map.getController().setCenter(getPoint(24.893379, 67.028061));
    map.getController().setCenter(p);
    map.setBuiltInZoomControls(true);
    marker = getResources().getDrawable(R.drawable.pushpin);
    marker.setBounds(0, 0, marker.getIntrinsicWidth(),
            marker.getIntrinsicHeight());
    OverlayItem newlocation = new OverlayItem(p, value,
            "You Selected This place");
    SitesOverlay s = new SitesOverlay(marker, newlocation);
    // s.SetPoint(newlocation);
    map.getOverlays().add(s);
    me = new MyLocationOverlay(this, map);
    map.getOverlays().add(me);
    mc.setZoom(10);
    mc.animateTo(p);
    map.invalidate();

}

public static JSONObject getLocationInfo(String address) {
    StringBuilder stringBuilder = new StringBuilder();
    try {

        address = address.replaceAll(" ", "%20");

        HttpPost httppost = new HttpPost(
                "http://maps.google.com/maps/api/geocode/json?address="
                        + address + "&sensor=false");
        HttpClient client = new DefaultHttpClient();
        HttpResponse response;
        stringBuilder = new StringBuilder();

        response = client.execute(httppost);
        HttpEntity entity = response.getEntity();
        InputStream stream = entity.getContent();
        int b;
        while ((b = stream.read()) != -1) {
            stringBuilder.append((char) b);
        }
    } catch (ClientProtocolException e) {
    } catch (IOException e) {
    }

    JSONObject jsonObject = new JSONObject();
    try {
        jsonObject = new JSONObject(stringBuilder.toString());
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return jsonObject;
}

public static GeoPoint getGeoPoint(JSONObject jsonObject) {

    Double lon = new Double(0);
    Double lat = new Double(0);

    try {

        lon = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                .getJSONObject("geometry").getJSONObject("location")
                .getDouble("lng");

        lat = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                .getJSONObject("geometry").getJSONObject("location")
                .getDouble("lat");

    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

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

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.location:
        Toast.makeText(this, "You pressed the location!", Toast.LENGTH_LONG)
                .show();
        return true;

    case R.id.street:
        Toast.makeText(this, "You pressed the street!", Toast.LENGTH_LONG)
                .show();
        if (map.isSatellite() == true) {
            map.setSatellite(false);
        }
        return true;

    case R.id.satallite:
        Toast.makeText(this, "You pressed the satallite!",
                Toast.LENGTH_LONG).show();
        if (map.isSatellite() == false) {
            map.setSatellite(true);
        }

        return true;

    default:
        return super.onOptionsItemSelected(item);
    }

}

@Override
public void onResume() {
    super.onResume();

    me.enableCompass();
}

@Override
public void onPause() {
    super.onPause();

    me.disableCompass();
}

@Override
protected boolean isRouteDisplayed() {
    return (false);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_S) {
        map.setSatellite(!map.isSatellite());
        return (true);
    } else if (keyCode == KeyEvent.KEYCODE_Z) {
        map.displayZoomControls(true);
        return (true);
    }

    return (super.onKeyDown(keyCode, event));
}

private GeoPoint getPoint(double lat, double lon) {
    return (new GeoPoint((int) (lat * 1000000.0), (int) (lon * 1000000.0)));
}

这是我的主要 xml 代码

      <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" 
android:layout_height="wrap_content">

<com.google.android.maps.MapView
    android:id="@+id/map"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:apiKey="0f7ZWSUbQaZNR9_csQVFdRHpjnARCHAR1WbkFAQ"
    android:clickable="true" />

<ImageView android:id="@+id/drag" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:src="@drawable/pushpin"
    android:visibility="gone" 
    android:contentDescription="@string/todo"/>

<Button
    android:id="@+id/BtnSearch"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:onClick="GoTolocation"
    android:text="Go" />

<AutoCompleteTextView
    android:id="@+id/txtSearchBox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_toLeftOf="@+id/BtnSearch"
    android:ems="10"
    android:hint="Search Here" >

    <requestFocus />
</AutoCompleteTextView>

    </RelativeLayout>

这是我的主要文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mapview_dragdrop_marker"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <uses-library android:name="com.google.android.maps" />

    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

下面是显示错误的 logcat。

   12-23 16:02:03.647: E/AndroidRuntime(788): FATAL EXCEPTION: main
   12-23 16:02:03.647: E/AndroidRuntime(788): java.lang.NullPointerException
   12-23 16:02:03.647: E/AndroidRuntime(788):   at   com.google.android.maps.ItemizedOverlay.getIndexToDraw(ItemizedOverlay.java:211)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.google.android.maps.ItemizedOverlay.draw(ItemizedOverlay.java:240)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.example.mapview_dragdrop_marker.MainActivity$SitesOverlay.draw(MainActivity.java:393)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.google.android.maps.Overlay.draw(Overlay.java:179) 
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:42)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.google.android.maps.MapView.onDraw(MapView.java:530)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.View.draw(View.java:6880)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.View.draw(View.java:6883)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.widget.FrameLayout.draw(FrameLayout.java:357)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.View.draw(View.java:6883)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.widget.FrameLayout.draw(FrameLayout.java:357)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1862)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewRoot.draw(ViewRoot.java:1522)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewRoot.performTraversals(ViewRoot.java:1258)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.os.Handler.dispatchMessage(Handler.java:99)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.os.Looper.loop(Looper.java:130)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at android.app.ActivityThread.main(ActivityThread.java:3683)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at java.lang.reflect.Method.invokeNative(Native Method)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at java.lang.reflect.Method.invoke(Method.java:507)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at                    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
   12-23 16:02:03.647: E/AndroidRuntime(788):   at dalvik.system.NativeStart.main(Native Method)

我不知道我在做什么错我什至填充列表以生成覆盖但它仍然给我错误

我正在使用 googleapi 10

4

1 回答 1

0

您的代码似乎有效（没有发现任何问题）。

尝试使用其他非常好的 google.maps 实现版本：

MyMapViewActivity 

public class MyMapViewActivity extends MapActivity {
public static final int MENU_MY_LOCATION = 0;
public static final int MENU_SEARCH = MENU_MY_LOCATION+1;
public static final int MENU_SUBMIT = MENU_MY_LOCATION+2;

MapView myMapView = null;
MapController mc = null;
OverlayItem myMarker;
MyItemizedOverlay mItemizedoverlay;
int mInputId;

MyLocationOverlay myLoc = null;

GeoPoint mCurrentPoint;

@Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub
    return false;
}

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

    myMapView = (MapView) findViewById(R.id.mapView);

    myMapView.setBuiltInZoomControls(true);
    myMapView.setStreetView(true);

    mc = myMapView.getController();
    mc.setZoom(17);
    myLoc = new CustomMyLocationOverlay(this, myMapView);
    myLoc.runOnFirstFix(new Runnable() {
        public void run() {
            if (mCurrentPoint.equals(new GeoPoint(0,0))){
                mc.animateTo(myLoc.getMyLocation());
                mCurrentPoint = myLoc.getMyLocation();
            } 
            // new
            // SearchClicked(mapSearchBox.getText().toString()).execute();

        }
    });

    myMapView.getOverlays().add(myLoc);
    myMapView.postInvalidate();

    zoomToMyLocation();

    Drawable drawable = this.getResources().getDrawable(R.drawable.target);
    mItemizedoverlay = new MyItemizedOverlay(drawable, this);

    Intent i = getIntent();
    Bundle extras = i.getExtras();
    mInputId = extras.getInt("input_id");
    String defaultLocation = extras.getString("default_location");
    defaultLocation = defaultLocation.replace("[", "").replace("]", "");
    String[] defLocSp = defaultLocation.split(",");

    double lat = Double.parseDouble(defLocSp[0]);
    double lon = Double.parseDouble(defLocSp[1]);

    mCurrentPoint = new GeoPoint((int)lat,(int)lon);

    if (!mCurrentPoint.equals(new GeoPoint(0,0))){
        mc.animateTo(mCurrentPoint);
        setMarker();
    } 
}

@Override
protected void onResume() {
    super.onResume();

    myLoc.enableCompass();
    myLoc.enableMyLocation();

}

@Override
protected void onPause() {
    super.onPause();

    myLoc.disableCompass();
    myLoc.disableMyLocation();
}

public void zoomToMyLocation() {
    mCurrentPoint = myLoc.getMyLocation();
    if (mCurrentPoint != null) {
        myMapView.getController().animateTo(mCurrentPoint);
        // myMapView.getController().setZoom(10);
    }
}

private class SearchClicked extends AsyncTask<Void, Void, Boolean> {
    private String toSearch;
    private Address address;

    public SearchClicked(String toSearch) {
        this.toSearch = toSearch;
    }

    @Override
    protected Boolean doInBackground(Void... voids) {

        try {
            Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.UK);
            List<Address> results = geocoder.getFromLocationName(toSearch, 1);

            if (results.size() == 0) {
                return false;
            }

            address = results.get(0);

              // Now do something with this GeoPoint:
            mCurrentPoint = new GeoPoint((int) (address.getLatitude() * 1E6), (int) (address.getLongitude() * 1E6));
            //Log.e("", "geocoded: "+mCurrentPoint.toString());
            myMapView.getController().animateTo(mCurrentPoint);

            myMarker = new OverlayItem(mCurrentPoint, "Submit", toSearch);
            mItemizedoverlay.addOverlay(myMarker);
            myMapView.getOverlays().add(mItemizedoverlay);

        } catch (Exception e) {
            Log.e("", "Something went wrong: ", e);
            return false;
        }
        return true;
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);

    MenuItem mi;
    mi = menu.add(0, MENU_MY_LOCATION, 0, "My Location");
    mi.setIcon(android.R.drawable.ic_menu_mylocation);

    mi = menu.add(0, MENU_SEARCH, 0, "Search");
    mi.setIcon(android.R.drawable.ic_menu_search);

    mi = menu.add(0, MENU_SUBMIT, 0, "Submit");
    mi.setIcon(android.R.drawable.ic_menu_add);



    return true;
}

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    menu.clear();

    MenuItem mi;
    mi = menu.add(0, MENU_MY_LOCATION, 0, "My Location");
    mi.setIcon(android.R.drawable.ic_menu_mylocation);

    mi = menu.add(0, MENU_SEARCH, 0, "Search");
    mi.setIcon(android.R.drawable.ic_menu_search);

    mi = menu.add(0, MENU_SUBMIT, 0, "Submit");
    mi.setIcon(android.R.drawable.ic_menu_add);


    return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
    switch(item.getItemId()) {
    case MENU_MY_LOCATION:  
        zoomToMyLocation();
        return true;

    case MENU_SEARCH:   
        searchLocation();
        return true;

    case MENU_SUBMIT:
        submitLocation();

        return true;



    default:
        return false;
    }
}

public void searchLocation(){
    final EditText input = new EditText(this);

    AlertDialog.Builder userInputDialogBuilder = new AlertDialog.Builder(this);
    userInputDialogBuilder.setTitle("Search Location")
    .setMessage("Enter Location:")
    .setView(input)
    .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {


            if (!input.getText().toString().equals("")){
                new SearchClicked(input.getText().toString()).execute();            
            }

        }
    }).setOnCancelListener(new Dialog.OnCancelListener() {
        public void onCancel(DialogInterface dialog) {
            //mUserInputDialog = null;
        }
    }).show();
}

public void submitLocation(){
    if (null != mCurrentPoint){
        Log.e("submit","Current point: "+mCurrentPoint.toString());

        Intent data = new Intent();
        Bundle extras = new Bundle();
        extras.putDouble("lat", mCurrentPoint.getLatitudeE6());
        extras.putDouble("lon", mCurrentPoint.getLongitudeE6());
        extras.putInt("input_id", mInputId);
        data.putExtras(extras);
        setResult(RESULT_OK,data);//Here I am Setting the Requestcode 1, you can put according to your requirement
        finish();
    }
}

public void setCurrentLocation(GeoPoint point){
    mCurrentPoint = point;

}

public void setMarker(){
    myMarker = new OverlayItem(mCurrentPoint, "Submit", "");
    mItemizedoverlay.clearOverlay();
    mItemizedoverlay.addOverlay(myMarker);
    myMapView.getOverlays().add(mItemizedoverlay);
}
}

MyItemizedOverlay

 public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
Context mContext;

public MyItemizedOverlay(Drawable defaultMarker) {
    super(boundCenterBottom(defaultMarker));
}

public void addOverlay(OverlayItem overlay) {
    mOverlays.add(overlay);
    populate();
}

public void clearOverlay(){
    mOverlays.clear();
}

@Override
protected OverlayItem createItem(int i) {
  return mOverlays.get(i);
}

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

public MyItemizedOverlay(Drawable defaultMarker, Context context) {
    super(boundCenterBottom(defaultMarker));
    mContext = context;
}

@Override
protected boolean onTap(int index) {
  final OverlayItem item = mOverlays.get(index);


AlertDialog.Builder userInputDialogBuilder = new AlertDialog.Builder(mContext);
    userInputDialogBuilder.setTitle(item.getTitle())
    .setMessage(item.getSnippet())
    .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {

            ((CobytMapViewActivity)mContext).setCurrentLocation(item.getPoint());
            ((CobytMapViewActivity)mContext).submitLocation();

        }
    }).setOnCancelListener(new Dialog.OnCancelListener() {
        public void onCancel(DialogInterface dialog) {
            //mUserInputDialog = null;
        }
    }).show();
  return true;
}
}
于 2012-12-23T11:40:43.853 回答