java - 从 Parse 加载图像时出现 NullPointerException

Question

我想从 Parse 云下载图像并将它们加载到 map 图标中。我正在使用 Picasso 将图像转换为位图。我是第一次使用 map ，我不确定我的方法是否正确将图像加载到 map 图标中。请有人帮助我!

  markerOpts =
                markerOpts.title(post.getText());
          String uri = post.getImage().getUrl();
          final MarkerOptions finalMarkerOpts = markerOpts;
          Picasso.with(context)
                  .load(uri)
                  .into(new Target() {
                    @Override
                    public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
            /* Save the bitmap or do something with it here */

                      //Set it in the ImageView
                      finalMarkerOpts.icon(BitmapDescriptorFactory.fromBitmap(bitmap));
                    }

                    @Override
                    public void onBitmapFailed(Drawable errorDrawable) {

                    }

                    @Override
                    public void onPrepareLoad(Drawable placeHolderDrawable) {

                    }
                  });
        //  }
          // Add a new marker
          Marker marker = mapFragment.getMap().addMarker(markerOpts);
          mapMarkers.put(post.getObjectId(), marker);
        //  if (post.getObjectId().equals(selectedPostObjectId)) {
         //   marker.showInfoWindow();
           // selectedPostObjectId = null;
      //   }
        }
        // Clean up old markers.
        cleanUpMarkers(toKeep);
      }
    });
  }

解析模型

 public ParseFile getImage(){
    return getParseFile("Image");
  }

日志:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.parse.ParseFile.getUrl()' on a null object reference
                                                                       at com.google.mywall.MainActivity$2.done(MainActivity.java:688)
                                                                       at com.google.mywall.MainActivity$2.done(MainActivity.java:627)

Answer 1

您没有在 post.getImage().getUrl(); 中获得任何值；所以你得到 nullPointerException。您是否正确解析了 setImage();