小编Mic*_*ael的帖子

我目前修改了"Google地图视图"代码(如下所示),但是当地图加载并且您点击地图上的项目时,它会返回错误.

我相信它与mContext的null值有关,但我不确定,如果有人能帮我解决这个问题,我真的很感激:

protected boolean onTap(int index) {
OverlayItem item = mOverlays.get(index);
Context mContext = null;
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);

我的地图类:

package testing.map;

import java.util.List;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;

public class Mapview extends MapActivity {
    /** Called when the activity is first created. */

protected boolean isRouteDisplayed(){
    return false;
}
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mapview);

        MapView mapView = (MapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);

        List<Overlay> mapOverlays = mapView.getOverlays(); …