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Android MapView 有时会崩溃（幻像空指针异常）

发布于 2024-12-16 16:20:08 字数 11637 浏览 0 评论 0原文

我的地图视图活动随机崩溃。我认为所有可能为空的变量都已得到处理，但十分之一的情况却没有得到处理。我已附上我的活动和下面的错误。

public class HomeActivity extends MapActivity {

boolean pickup = false;

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

    findViewById(R.id.searchBar).setVisibility(View.VISIBLE);

    findViewById(R.id.searchBar).setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            //load new dialog thing with only a onSearchRequested() thing, and a bg click that finishes the app

            //but also somehow returns the result back to the map??? put intent, here get intent on resume()?? or whatever, debug breakpoints
            findViewById(R.id.searchBar).setVisibility(View.GONE);

            Intent pseudoSearch = new Intent(HomeGroup.group, PseudoMapSearchActivity.class);
            startActivityForResult(pseudoSearch, 0);
        }

    });

    // initialize the map and set the default location
    MapView map = (MapView) findViewById(R.id.map);
    //map.setBuiltInZoomControls(true);
    map.setSatellite(false);


    MapController controller = map.getController();
    List<Overlay> overlays = map.getOverlays();

    Drawable drawable = this.getResources().getDrawable(
            R.drawable.origin_pin);
    HomeItemizedOverlay overlay = new HomeItemizedOverlay(drawable,
            HomeGroup.group);


    overlays.clear();
    overlays.add(overlay);

    controller.setZoom(17);
    map.postInvalidate();

    final LocationManager locator = (LocationManager) this
            .getSystemService(Context.LOCATION_SERVICE);
    String provider = "";

    // check what location provider is available
    if (!locator.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
        //provider = LocationManager.GPS_PROVIDER;

        //force user to turn on gps
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setPowerRequirement(Criteria.POWER_HIGH);

        LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        provider = lm.getBestProvider(criteria, true);
    } else {
        provider = LocationManager.GPS_PROVIDER;
    }

    // get the current location
    if (provider != null) {
        //setLocation(locator.getLastKnownLocation(provider));

        final LocationListener listener = new LocationListener() {

            @Override
            public void onLocationChanged(Location location) {
                setLocation(location);
                locator.removeUpdates(this);
            }

            @Override
            public void onProviderDisabled(String provider) {
            }

            @Override
            public void onProviderEnabled(String provider) {
            }

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

        locator.requestLocationUpdates(provider, 15000, 0, listener);
    } else {
        Toast toast = Toast.makeText(HomeActivity.this,
                "Location provider could not be found.", Toast.LENGTH_LONG);
        toast.show();
    }

}

/**
 * Performs any action required to update the current location displayed on
 * the home map.
 * 
 * @param location
 *            A {@link Location} object with the new location to display.
 */
private void setLocation(Location location) {

    if (location == null) {
        return;
    }

    if(AndroidHelper.pickup == false)
    {
        MapView map = (MapView) findViewById(R.id.map);
        map.setSatellite(false);

        MapController controller = map.getController();
        List<Overlay> overlays = map.getOverlays();

        Drawable drawable = this.getResources().getDrawable(
            R.drawable.origin_pin);
        HomeItemizedOverlay overlay = new HomeItemizedOverlay(drawable,
            HomeGroup.group);

        int latitude = (int) (location.getLatitude() * 1e6);
        int longitude = (int) (location.getLongitude() * 1e6);

        GeoPoint point = new GeoPoint(latitude, longitude);
        if(point!=null)
        {   
            OverlayItem item = new OverlayItem(point, "Current Location",
                    "This is where you are currently located.");
            overlay.setOrigin(item);
        }
        overlays.clear();
        overlays.add(overlay);

        controller.animateTo(point);
        controller.setZoom(18);
        map.postInvalidate();
    }



}

这是我的 HomeItemizedOverlay 类，

 public class HomeItemizedOverlay extends ItemizedOverlay<OverlayItem> {

    private Map<Integer, OverlayItem> overlays = null;
    private Context context = null;

    private static final int ORIGIN = 0;
    private static final int DESTINATION = 1;

    public HomeItemizedOverlay(Drawable defaultMarker) {
            super(boundCenterBottom(defaultMarker));
            this.overlays = new HashMap<Integer, OverlayItem>();
    }

    public HomeItemizedOverlay(Drawable defaultMarker, Context context) {
            this(defaultMarker);
            this.context = context;
    }

    /**
     * Set an {@link OverlayItem} to be the origin and calls {@link #populate()}
     * to create the overlay.
     * 
     * @param item
     *            An item to add to the overlay.
     */
    public void setOrigin(OverlayItem item) {
            this.overlays.put(ORIGIN, item);
            populate();
    }

    /**
     * Adds an {@link OverlayItem} to be the destination and calls
     * {@link #populate()} to create the overlay.
     * 
     * @param item
     *            An item to add to the overlay.
     */
    public void setDestination(OverlayItem item) {
            this.overlays.put(DESTINATION, item);
            populate();
    }

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

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

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

            //think this causes crashes
            AlertDialog.Builder dialog = new AlertDialog.Builder(this.context);
            dialog.setTitle(item.getTitle());
            dialog.setMessage(item.getSnippet());
            dialog.show();

            return true;
    }
}

这个 logcat 错误没有提到我的代码中的一行，所以我真的不明白它在哪里中断。这种情况发生大约十分之一。

11-15 13:47:13.192: E/AndroidRuntime(3585): FATAL EXCEPTION: main
11-15 13:47:13.192: E/AndroidRuntime(3585): java.lang.NullPointerException
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.getItemsAtLocation(ItemizedOverlay.java:617)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.getItemAtLocation(ItemizedOverlay.java:586)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.handleMotionEvent(ItemizedOverlay.java:498)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.onTouchEvent(ItemizedOverlay.java:572)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.OverlayBundle.onTouchEvent(OverlayBundle.java:63)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.MapView.onTouchEvent(MapView.java:679)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.View.dispatchTouchEvent(View.java:3882)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2204)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1888)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.os.Looper.loop(Looper.java:130)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.ActivityThread.main(ActivityThread.java:3683)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at java.lang.reflect.Method.invokeNative(Native Method)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at java.lang.reflect.Method.invoke(Method.java:507)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at dalvik.system.NativeStart.main(Native Method)
原文

my activity with a mapview crashes out randomly. I think all my potentially null variables are handled but one out of 10 times, they are not. I've attached my activity and the error below.

public class HomeActivity extends MapActivity {

boolean pickup = false;

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

    findViewById(R.id.searchBar).setVisibility(View.VISIBLE);

    findViewById(R.id.searchBar).setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            //load new dialog thing with only a onSearchRequested() thing, and a bg click that finishes the app

            //but also somehow returns the result back to the map??? put intent, here get intent on resume()?? or whatever, debug breakpoints
            findViewById(R.id.searchBar).setVisibility(View.GONE);

            Intent pseudoSearch = new Intent(HomeGroup.group, PseudoMapSearchActivity.class);
            startActivityForResult(pseudoSearch, 0);
        }

    });

    // initialize the map and set the default location
    MapView map = (MapView) findViewById(R.id.map);
    //map.setBuiltInZoomControls(true);
    map.setSatellite(false);


    MapController controller = map.getController();
    List<Overlay> overlays = map.getOverlays();

    Drawable drawable = this.getResources().getDrawable(
            R.drawable.origin_pin);
    HomeItemizedOverlay overlay = new HomeItemizedOverlay(drawable,
            HomeGroup.group);


    overlays.clear();
    overlays.add(overlay);

    controller.setZoom(17);
    map.postInvalidate();

    final LocationManager locator = (LocationManager) this
            .getSystemService(Context.LOCATION_SERVICE);
    String provider = "";

    // check what location provider is available
    if (!locator.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
        //provider = LocationManager.GPS_PROVIDER;

        //force user to turn on gps
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setPowerRequirement(Criteria.POWER_HIGH);

        LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        provider = lm.getBestProvider(criteria, true);
    } else {
        provider = LocationManager.GPS_PROVIDER;
    }

    // get the current location
    if (provider != null) {
        //setLocation(locator.getLastKnownLocation(provider));

        final LocationListener listener = new LocationListener() {

            @Override
            public void onLocationChanged(Location location) {
                setLocation(location);
                locator.removeUpdates(this);
            }

            @Override
            public void onProviderDisabled(String provider) {
            }

            @Override
            public void onProviderEnabled(String provider) {
            }

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

        locator.requestLocationUpdates(provider, 15000, 0, listener);
    } else {
        Toast toast = Toast.makeText(HomeActivity.this,
                "Location provider could not be found.", Toast.LENGTH_LONG);
        toast.show();
    }

}

/**
 * Performs any action required to update the current location displayed on
 * the home map.
 * 
 * @param location
 *            A {@link Location} object with the new location to display.
 */
private void setLocation(Location location) {

    if (location == null) {
        return;
    }

    if(AndroidHelper.pickup == false)
    {
        MapView map = (MapView) findViewById(R.id.map);
        map.setSatellite(false);

        MapController controller = map.getController();
        List<Overlay> overlays = map.getOverlays();

        Drawable drawable = this.getResources().getDrawable(
            R.drawable.origin_pin);
        HomeItemizedOverlay overlay = new HomeItemizedOverlay(drawable,
            HomeGroup.group);

        int latitude = (int) (location.getLatitude() * 1e6);
        int longitude = (int) (location.getLongitude() * 1e6);

        GeoPoint point = new GeoPoint(latitude, longitude);
        if(point!=null)
        {   
            OverlayItem item = new OverlayItem(point, "Current Location",
                    "This is where you are currently located.");
            overlay.setOrigin(item);
        }
        overlays.clear();
        overlays.add(overlay);

        controller.animateTo(point);
        controller.setZoom(18);
        map.postInvalidate();
    }



}

here is my HomeItemizedOverlay class

 public class HomeItemizedOverlay extends ItemizedOverlay<OverlayItem> {

    private Map<Integer, OverlayItem> overlays = null;
    private Context context = null;

    private static final int ORIGIN = 0;
    private static final int DESTINATION = 1;

    public HomeItemizedOverlay(Drawable defaultMarker) {
            super(boundCenterBottom(defaultMarker));
            this.overlays = new HashMap<Integer, OverlayItem>();
    }

    public HomeItemizedOverlay(Drawable defaultMarker, Context context) {
            this(defaultMarker);
            this.context = context;
    }

    /**
     * Set an {@link OverlayItem} to be the origin and calls {@link #populate()}
     * to create the overlay.
     * 
     * @param item
     *            An item to add to the overlay.
     */
    public void setOrigin(OverlayItem item) {
            this.overlays.put(ORIGIN, item);
            populate();
    }

    /**
     * Adds an {@link OverlayItem} to be the destination and calls
     * {@link #populate()} to create the overlay.
     * 
     * @param item
     *            An item to add to the overlay.
     */
    public void setDestination(OverlayItem item) {
            this.overlays.put(DESTINATION, item);
            populate();
    }

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

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

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

            //think this causes crashes
            AlertDialog.Builder dialog = new AlertDialog.Builder(this.context);
            dialog.setTitle(item.getTitle());
            dialog.setMessage(item.getSnippet());
            dialog.show();

            return true;
    }
}

this logcat error does not mention a line in my code, so I don't really understand where it is breaking. This happens about 1 out of 10 times.

11-15 13:47:13.192: E/AndroidRuntime(3585): FATAL EXCEPTION: main
11-15 13:47:13.192: E/AndroidRuntime(3585): java.lang.NullPointerException
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.getItemsAtLocation(ItemizedOverlay.java:617)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.getItemAtLocation(ItemizedOverlay.java:586)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.handleMotionEvent(ItemizedOverlay.java:498)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.ItemizedOverlay.onTouchEvent(ItemizedOverlay.java:572)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.OverlayBundle.onTouchEvent(OverlayBundle.java:63)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.google.android.maps.MapView.onTouchEvent(MapView.java:679)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.View.dispatchTouchEvent(View.java:3882)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2204)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1888)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.os.Looper.loop(Looper.java:130)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at android.app.ActivityThread.main(ActivityThread.java:3683)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at java.lang.reflect.Method.invokeNative(Native Method)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at java.lang.reflect.Method.invoke(Method.java:507)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-15 13:47:13.192: E/AndroidRuntime(3585):     at dalvik.system.NativeStart.main(Native Method)

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并安 2024-12-23 16:20:08

尝试在构造函数中调用 super 后立即调用 populate() 。还有其他类似问题的投诉 http://code.google。 com/p/android/issues/detail?id=2035。

populate 的 javadoc 说：

在新的 ItemizedOverlay 上执行所有处理的实用方法。子类通过 createItem(int) 方法提供 Items。子类应该在获得数据后立即调用它，然后再调用其他任何内容。

老实说，这不是很有帮助，但我相信您必须在构造函数中调用此方法。

Try calling populate() immediately after you call super in your constructor. There have been other complaints of problems like this http://code.google.com/p/android/issues/detail?id=2035.

The javadoc for populate says:

Utility method to perform all processing on a new ItemizedOverlay. Subclasses provide Items through the createItem(int) method. The subclass should call this as soon as it has data, before anything else gets called.

which honestly isn't very helpful, but I believe you have to call this method in your constructor.

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