我制作了一个简单的FragmentActivity，显示谷歌地图，并使用标记显示当前位置和附近的地方。但现在我需要在另一个应用程序中使用该代码，我遇到了这个问题。
这是活动
private void updatePlaces(JSONArray jDestinationArray) throws JSONException{
locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
double lat = lastLoc.getLatitude();
double lng = lastLoc.getLongitude();
lastLatLng = new LatLng(lat, lng);
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
Builder boundsBuilder = new LatLngBounds.Builder();
boundsBuilder.include(lastLatLng);
markers = new HashMap<Marker,Object>();
userMarker = map.addMarker(new MarkerOptions()
.position(lastLatLng)
.title("You are here")
.icon(BitmapDescriptorFactory.fromResource(userIcon))
.snippet("This is your last recorded location"));
markers.put(userMarker, lastLatLng);
for(int i=0; i<jDestinationArray.length(); i++){
JSONObject destinationObject = jDestinationArray.getJSONObject(i);
LatLng latlng = new LatLng(destinationObject.getDouble("latitude"), destinationObject.getDouble("longitude"));
Marker destinationMarker=
map.addMarker(new MarkerOptions()
.position(latlng)
.title(destinationObject.getString("name"))
.icon(BitmapDescriptorFactory.fromResource(destinationIcon))
.snippet(destinationObject.getString("street"))
);
markers.put(destinationMarker, latlng);
boundsBuilder.include(latlng);
}
// pan to see all markers on map:
LatLngBounds bounds = boundsBuilder.build();
map.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, width, height, 30));
//map.animateCamera(CameraUpdateFactory.newLatLng(lastLatLng), 3000, null);
}
当我打开地图时的日志：
06-27 14:18:28.530: D/dalvikvm(3545): GC_CONCURRENT freed 755K, 10% free 10520K/11655K, paused 13ms+4ms, total 50ms
06-27 14:18:28.530: D/dalvikvm(3545): WAIT_FOR_CONCURRENT_GC blocked 33ms
06-27 14:18:28.580: D/dalvikvm(3545): GC_FOR_ALLOC freed 756K, 11% free 10396K/11655K, paused 26ms, total 26ms
06-27 14:18:28.680: D/dalvikvm(3545): GC_CONCURRENT freed 690K, 11% free 10437K/11655K, paused 2ms+14ms, total 56ms
06-27 14:18:28.680: D/dalvikvm(3545): WAIT_FOR_CONCURRENT_GC blocked 21ms
06-27 14:18:28.710: W/ResourceType(3545): No package identifier when getting value for resource number 0x00000000
06-27 14:18:28.710: D/AndroidRuntime(3545): Shutting down VM
06-27 14:18:28.710: W/dalvikvm(3545): threadid=1: thread exiting with uncaught exception (group=0x40c42318)
06-27 14:18:28.730: E/AndroidRuntime(3545): FATAL EXCEPTION: main
06-27 14:18:28.730: E/AndroidRuntime(3545): java.lang.NullPointerException
06-27 14:18:28.730: E/AndroidRuntime(3545): at maps.aj.bk.a(Unknown Source)
06-27 14:18:28.730: E/AndroidRuntime(3545): at maps.aj.bk.a(Unknown Source)
06-27 14:18:28.730: E/AndroidRuntime(3545): at maps.aj.al.a(Unknown Source)
06-27 14:18:28.730: E/AndroidRuntime(3545): at bcn.onTransact(SourceFile:167)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.os.Binder.transact(Binder.java:326)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a.addMarker(Unknown Source)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.example.foodexp03a.MainActivity.updatePlaces(MainActivity.java:330)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.example.foodexp03a.MainActivity.access$1(MainActivity.java:312)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.example.foodexp03a.MainActivity$LongRunningGetIO.onPostExecute(MainActivity.java:394)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.example.foodexp03a.MainActivity$LongRunningGetIO.onPostExecute(MainActivity.java:1)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.os.AsyncTask.finish(AsyncTask.java:631)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.os.AsyncTask.access$600(AsyncTask.java:177)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.os.Handler.dispatchMessage(Handler.java:99)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.os.Looper.loop(Looper.java:137)
06-27 14:18:28.730: E/AndroidRuntime(3545): at android.app.ActivityThread.main(ActivityThread.java:4744)
06-27 14:18:28.730: E/AndroidRuntime(3545): at java.lang.reflect.Method.invokeNative(Native Method)
06-27 14:18:28.730: E/AndroidRuntime(3545): at java.lang.reflect.Method.invoke(Method.java:511)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-27 14:18:28.730: E/AndroidRuntime(3545): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-27 14:18:28.730: E/AndroidRuntime(3545): at dalvik.system.NativeStart.main(Native Method)
06-27 14:18:28.900: D/dalvikvm(3545): GC_FOR_ALLOC freed 274K, 7% free 10937K/11655K, paused 62ms, total 62ms
06-27 14:18:28.980: D/dalvikvm(3545): GC_CONCURRENT freed 65K, 7% free 10945K/11655K, paused 12ms+14ms, total 82ms
06-27 14:18:28.980: D/dalvikvm(3545): WAIT_FOR_CONCURRENT_GC blocked 1ms
06-27 14:18:29.010: D/dalvikvm(3545): GC_FOR_ALLOC freed 26K, 7% free 10918K/11655K, paused 31ms, total 31ms
06-27 14:18:29.020: I/dalvikvm-heap(3545): Grow heap (frag case) to 11.700MB for 1048592-byte allocation
06-27 14:18:29.050: D/dalvikvm(3545): GC_FOR_ALLOC freed <1K, 7% free 11942K/12743K, paused 30ms, total 30ms
06-27 14:18:29.110: D/dalvikvm(3545): GC_CONCURRENT freed <1K, 6% free 11981K/12743K, paused 2ms+23ms, total 57ms
06-27 14:18:29.201: D/dalvikvm(3545): GC_FOR_ALLOC freed 1219K, 15% free 10945K/12743K, paused 38ms, total 38ms
06-27 14:18:29.211: I/dalvikvm-heap(3545): Grow heap (frag case) to 11.725MB for 1048592-byte allocation
06-27 14:18:29.231: D/dalvikvm(3545): GC_FOR_ALLOC freed 1K, 7% free 11967K/12743K, paused 28ms, total 28ms
06-27 14:18:29.321: D/dalvikvm(3545): GC_CONCURRENT freed 1136K, 12% free 11290K/12743K, paused 13ms+20ms, total 82ms
06-27 14:18:29.461: D/dalvikvm(3545): GC_CONCURRENT freed 48K, 4% free 12305K/12743K, paused 27ms+14ms, total 93ms
06-27 14:18:29.461: D/dalvikvm(3545): WAIT_FOR_CONCURRENT_GC blocked 33ms
06-27 14:18:29.641: D/dalvikvm(3545): GC_FOR_ALLOC freed 2623K, 22% free 10873K/13831K, paused 31ms, total 32ms
06-27 14:18:29.641: I/dalvikvm-heap(3545): Grow heap (frag case) to 11.656MB for 1048592-byte allocation
06-27 14:18:29.671: D/dalvikvm(3545): GC_FOR_ALLOC freed 1K, 15% free 11895K/13831K, paused 37ms, total 37ms
06-27 14:18:29.721: D/dalvikvm(3545): GC_CONCURRENT freed 75K, 14% free 11898K/13831K, paused 2ms+4ms, total 45ms
06-27 14:18:29.801: D/dalvikvm(3545): GC_FOR_ALLOC freed 2113K, 22% free 10892K/13831K, paused 26ms, total 26ms
06-27 14:18:29.801: I/dalvikvm-heap(3545): Grow heap (frag case) to 11.674MB for 1048592-byte allocation
06-27 14:18:29.831: D/dalvikvm(3545): GC_FOR_ALLOC freed 4K, 14% free 11912K/13831K, paused 26ms, total 26ms
06-27 14:18:29.891: D/dalvikvm(3545): GC_CONCURRENT freed 21K, 14% free 11917K/13831K, paused 13ms+7ms, total 63ms
06-27 14:18:30.021: D/dalvikvm(3545): GC_CONCURRENT freed 2261K, 21% free 10952K/13831K, paused 12ms+8ms, total 66ms
06-27 14:18:30.021: D/dalvikvm(3545): WAIT_FOR_CONCURRENT_GC blocked 1ms
06-27 14:18:31.443: I/Process(3545): Sending signal. PID: 3545 SIG: 9
活动布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<fragment android:name="com.example.foodexp03a.HomeFragment"
android:id="@+id/homeFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<fragment android:name="com.example.foodexp03a.LoginFragment"
android:id="@+id/loginFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<fragment android:name="com.example.foodexp03a.SettingsFragment"
android:id="@+id/settingsFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<fragment android:name="com.example.foodexp03a.DestinationFragment"
android:id="@+id/destinationFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<fragment
android:id="@+id/mapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
</LinearLayout>
答案 0 :(得分：5)
我看不到您为userIcon分配任何值的位置，因此BitmapDescriptorFactory.fromResource(userIcon)可能会返回null。
答案 1 :(得分：1)
解决方案：
在onCreate方法中添加以下行
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder（）。permitAll（）。build（）;
StrictMode.setThreadPolicy（策略）;