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我在自己的應用上使用了Google地圖API版本1，並在上面添加了自定義重疊項。問題是，在很多場合我遇到崩潰和強制關閉應用程序，我很確定它是由地圖引起的。我檢查了線程，我意識到我需要使用populate（）函數。谷歌地圖API崩潰
的問題是我不知道在哪裏使用它究竟是因爲代碼是不是我最初寫:(。
03-27 10:53:09.440: E/InputEventReceiver(28709): Exception dispatching input event.
03-27 10:53:09.440: E/MessageQueue-JNI(28709): Exception in MessageQueue callback: handleReceiveCallback
03-27 10:53:09.490: E/MessageQueue-JNI(28709): java.lang.NullPointerException
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at com.google.android.maps.ItemizedOverlay.getItemsAtLocation(ItemizedOverlay.java:617)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at com.google.android.maps.ItemizedOverlay.getItemAtLocation(ItemizedOverlay.java:586)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at com.google.android.maps.ItemizedOverlay.handleMotionEvent(ItemizedOverlay.java:498)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at com.google.android.maps.ItemizedOverlay.onTouchEvent(ItemizedOverlay.java:572)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at com.google.android.maps.OverlayBundle.onTouchEvent(OverlayBundle.java:63)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at com.google.android.maps.MapView.onTouchEvent(MapView.java:681)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.View.dispatchTouchEvent(View.java:7337)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2410)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2145)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2117)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2117)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2117)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2117)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2117)
03-27 10:53:09.490: E/MessageQueue-JNI(28709): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
這裏是我的逐項覆蓋類，這是造成麻煩
public class AdvrItemizedOverlay extends ItemizedOverlay<MapOverlayItem> {
protected Vector<AdvrMapItem> mOverlayItems = new Vector<AdvrMapItem>();
protected Bitmap mEmptyMarker = null;
protected Resources mResources = null;
protected Rect mDstRect = new Rect(6, 6, 66, 66);
public AdvrItemizedOverlay(Resources res) {
super(boundCenterBottom(res.getDrawable(R.drawable.bg_map_mark_adver)));
mEmptyMarker = BitmapFactory.decodeResource(res, R.drawable.bg_map_mark_adver);
float density = (float)mEmptyMarker.getWidth()/72.0f;
mDstRect.left *= density;
mDstRect.top *= density;
mDstRect.right *= density;
mDstRect.bottom *= density;
mResources = res;
performPopulated();
}
@Override
protected MapOverlayItem createItem(int i) {
AdvrMapItem advrItem = mOverlayItems.get(i);
MapOverlayItem overlayItem = advrItem.overlayItem();
Drawable marker = advrItem.mapMarker(mResources, mEmptyMarker, mDstRect);
if (marker != null)
overlayItem.setMarker(boundCenterBottom(marker));
return overlayItem;
}
@Override
public int size() {
return mOverlayItems.size();
}
public void add(AdvrMapItem userItem) {
mOverlayItems.add(userItem);
populate();
}
public void remove(AdvrMapItem item) {
mOverlayItems.remove(item);
setLastFocusedIndex(-1);
populate();
}
public void clear() {
mOverlayItems.removeAllElements();
setLastFocusedIndex(-1);
populate();
}
public void performPopulated() { populate(); }
}
我不知道到底時，構造函數被調用和放置位置填入方法。感謝所有