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我正在创建一个地图应用程序，它接收来自JSON数组的坐标列表。我@Override dispatchTouchEvent找到地图上的坐标，然后执行一个ASYNCTask来获得新的点。Android MapView JSON数组添加点数组
它加载的点但滚动后，它强制关闭。最理想的是清除地图上的当前点并在触摸事件之后从新位置重新加载新点。
这是到目前为止我的代码：
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int actionType = ev.getAction();
switch (actionType) {
case MotionEvent.ACTION_UP:
Projection proj = mapView.getProjection();
GeoPoint loc = proj.fromPixels((int) ev.getX(), (int) ev.getY());
String lng = Double.toString(loc.getLongitudeE6()/1e6);
String lat = Double.toString(loc.getLatitudeE6()/1e6);
new mapStations().execute();
Toast.makeText(getApplicationContext(),
"Lat: " + lat + " Lng: " + lng, Toast.LENGTH_SHORT).show();
}
return super.dispatchTouchEvent(ev);
}
private class mapStations extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
try {
JSONObject obj = new JSONObject(API.nearByStations(lat, lng, 0));
JSONArray stations = obj.getJSONArray("stations");
for (int j = 0; j < stations.length(); j++) {
JSONObject jsonObject = stations.getJSONObject(j);
add(jsonObject.getDouble("lat"), jsonObject.getDouble("lng"));
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
public void add(double lat, double lng) {
mapOverlays = mapView.getOverlays();
drawable = this.getResources().getDrawable(R.drawable.androidmarker);
itemizedOverlay = new MapsOverlay(drawable);
GeoPoint point = new GeoPoint((int) (lat * 1e6), (int) (lng * 1e6));
OverlayItem overlayitem = new OverlayItem(point, "", "");
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);
}
的logcat：
12-18 22:52:01.076: E/AndroidRuntime(25072): FATAL EXCEPTION: main
12-18 22:52:01.076: E/AndroidRuntime(25072): java.util.ConcurrentModificationException
12-18 22:52:01.076: E/AndroidRuntime(25072): at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:576)
12-18 22:52:01.076: E/AndroidRuntime(25072): at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:41)
12-18 22:52:01.076: E/AndroidRuntime(25072): at com.google.android.maps.MapView.onDraw(MapView.java:530)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.View.draw(View.java:6880)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.View.draw(View.java:6883)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.widget.FrameLayout.draw(FrameLayout.java:357)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.View.draw(View.java:6883)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.widget.FrameLayout.draw(FrameLayout.java:357)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.View.draw(View.java:6883)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.widget.FrameLayout.draw(FrameLayout.java:357)
12-18 22:52:01.076: E/AndroidRuntime(25072): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2106)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewRoot.draw(ViewRoot.java:1562)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewRoot.performTraversals(ViewRoot.java:1298)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.view.ViewRoot.handleMessage(ViewRoot.java:1911)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.os.Looper.loop(Looper.java:130)
12-18 22:52:01.076: E/AndroidRuntime(25072): at android.app.ActivityThread.main(ActivityThread.java:3821)
12-18 22:52:01.076: E/AndroidRuntime(25072): at java.lang.reflect.Method.invokeNative(Native Method)
12-18 22:52:01.076: E/AndroidRuntime(25072): at java.lang.reflect.Method.invoke(Method.java:507)
12-18 22:52:01.076: E/AndroidRuntime(25072): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-18 22:52:01.076: E/AndroidRuntime(25072): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-18 22:52:01.076: E/AndroidRuntime(25072): at dalvik.system.NativeStart.main(Native Method)
在后来的笔记，我想对每一个点和一个水龙头事件不同的图标，弹出详细资料关于这一点用户点击。我昨晚在这个晚上花了大约六个小时，但无法弄清楚。 logcat实际上并没有多大意义。
我不能相信我过来看了那个作为最后一道防线。你知道一个学习如何添加不同引脚和标签事件的好地方吗？我需要这些引脚来显示不同的信息，具体取决于JSON带回的内容。 – 2011-12-19 18:46:28