Question

我正在尝试将用户的Facebook个人资料照片应用为标记中的“图标”属性。但由于某些未知原因，我这样做时会收到Nullpointer异常。

语法是正确的，我只是切断了一些代码，只是为了向你展示影响它的唯一一点（与标记有关）。

AccessToken accessToken = AccessToken.getCurrentAccessToken();
            MarkerOptions marker = new MarkerOptions().position(
                    new LatLng(point.latitude, point.longitude)).title("New Marker");
            globalMap.addMarker(marker
                    .position(point)
                    .icon(BitmapDescriptorFactory.fromBitmap(getFacebookProfilePicture(accessToken.getUserId())))
                    .anchor(0.5f, 1));
        }
    });
}

public static Bitmap getFacebookProfilePicture(String userID){
    Bitmap bitmap = null;
    try {
        URL imageURL = new URL("https://graph.facebook.com/" + userID + "/picture?type=large");
         bitmap = BitmapFactory.decodeStream(imageURL.openConnection().getInputStream());
    }catch(Exception e){

    }
    return bitmap;
}

我认为正是这条线给了我这个问题，但是......

icon(BitmapDescriptorFactory.fromBitmap(getFacebookProfilePicture(accessToken.getUserId())))

......这就是logcat所说的：

 java.lang.NullPointerException
                                                                 at maps.f.g.a(Unknown Source)
                                                                 at maps.ag.g$a.<init>(Unknown Source)
                                                                 at maps.ag.g.a(Unknown Source)
                                                                 at maps.ag.R.<init>(Unknown Source)
                                                                 at maps.ag.t.a(Unknown Source)

Answer 1

您的错误在于您没有建立实际的网络连接。在加载用户的个人资料图像之前，您应该调用URLConnection.Connect（）方法。

try {
    URL imageURL = new URL("https://graph.facebook.com/" + userID + "/picture?type=large");
    HttpURLConnection connection = (HttpURLConnection) imageUrl.openConnection();
    connection.setDoInput(true);
    connection.connect();
    bitmap = BitmapFactory.decodeStream(connection.getInputStream());
catch(IOException ex) {

}

尝试将用户的Facebook个人资料图片加载到标记中会导致Nullpointer异常

1 个答案: