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我使用了本教程 http://crazyandroidian.blogspot.com/2011/10/custom-mapview-popup-in-android.html请告诉我如何在气球标签中添加图像。我想在标记点气泡中添加位置图像。此代码仅显示一条文本消息，但没有图像。

package com.readystatesoftware.mapviewballoons;
import mapviewballoons.example.R;
import java.lang.reflect.Method;
import java.util.List;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;

public abstract class BalloonItemizedOverlay<Item> extends ItemizedOverlay<OverlayItem>  {
  private MapView mapView;
  private BalloonOverlayView balloonView;
  private View clickRegion;
  private int viewOffset;
  final MapController mc;

  public BalloonItemizedOverlay(Drawable defaultMarker, MapView mapView) {
    super(defaultMarker);
    this.mapView = mapView;
    viewOffset = 0;
    mc = mapView.getController();
  }
  public void setBalloonBottomOffset(int pixels) {
    viewOffset = pixels;
  }
  protected boolean onBalloonTap(int index) {
    return false;
  }
  @Override
  protected final boolean onTap(int index) {
    boolean isRecycled;
    final int thisIndex;
    GeoPoint point;
    thisIndex = index;
    point = createItem(index).getPoint();
    if (balloonView == null) {
      balloonView = new BalloonOverlayView(mapView.getContext(), viewOffset);
      clickRegion = (View) balloonView.findViewById(R.id.balloon_inner_layout);
      isRecycled = false;
    } else {
      isRecycled = true;
    }
    balloonView.setVisibility(View.GONE);
    List<Overlay> mapOverlays = mapView.getOverlays();
    if (mapOverlays.size() > 1) {
      hideOtherBalloons(mapOverlays);
    }
    balloonView.setData(createItem(index));
    MapView.LayoutParams params = new MapView.LayoutParams(
      LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, point,
      MapView.LayoutParams.BOTTOM_CENTER
    );
    params.mode = MapView.LayoutParams.MODE_MAP;
    setBalloonTouchListener(thisIndex);
    balloonView.setVisibility(View.VISIBLE);
    if (isRecycled) {
      balloonView.setLayoutParams(params);
    } else {
      mapView.addView(balloonView, params);
    }
    mc.animateTo(point);
    return true;
  }
  /**
    * Sets the visibility of this overlay's balloon view to GONE.
  */
  private void hideBalloon() {
    if (balloonView != null) {
      balloonView.setVisibility(View.GONE);
    }
  }
  private void hideOtherBalloons(List<Overlay> overlays) {
    for (Overlay overlay : overlays) {
      if (overlay instanceof BalloonItemizedOverlay<?> && overlay != this) {
        ((BalloonItemizedOverlay<?>) overlay).hideBalloon();
      }
    }
  }
  private void setBalloonTouchListener(final int thisIndex) {
    try {
      @SuppressWarnings("unused")
      Method m = this.getClass().getDeclaredMethod("onBalloonTap", int.class);
      clickRegion.setOnTouchListener(new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
          View l =  ((View) v.getParent()).findViewById(R.id.balloon_main_layout);
          Drawable d = l.getBackground();
          if (event.getAction() == MotionEvent.ACTION_DOWN) {
            int[] states = {android.R.attr.state_pressed};
            if (d.setState(states)) {
              d.invalidateSelf();
            }
            return true;
          } else if (event.getAction() == MotionEvent.ACTION_UP) {
            int newStates[] = {};
            if (d.setState(newStates)) {
              d.invalidateSelf();
            }
            // call overridden method
            onBalloonTap(thisIndex);
            return true;
          } else {
            return false;
          }
        }
      });
    } catch (SecurityException e) {
      Log.e("BalloonItemizedOverlay", "setBalloonTouchListener reflection SecurityException");
      return;
    } catch (NoSuchMethodException e) {
      // method not overridden - do nothing
      return;
    }
  }
}
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1 回答 1

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我相信你需要为你的气球创建一个布局。在本教程中，作者创建了一个气球视图并拥有一个 balloon.xml。要显示图像，您需要将正确的图像视图放入 XML 文件中。有点像尝试在需要行布局的列表视图中显示文本和图像。除非我错过了，否则您需要在您的 R.id.balloon_main_layout

您甚至可能需要创建一个扩展 OverlayItem 的类，因为地图上的每个项目都可能有与之关联的不同图片。如果您创建一个扩展 OverlayItem 的项目，那么您可以传入图片或具有在创建叠加层时检索图片的功能。

编辑：您的示例完全按照它描述的方式工作。您在评论中链接到的教程可以解决您的问题。本教程显示文本，ImageView旁边有一个。图片在教程底部提供给您，您必须将它们保存到 res 目录中名为 drawable 的文件夹中。

编辑：我实际上刚刚得到了你使用的代码。它显示一个空白地图，因为我没有输入我的 api 密钥，但弹出窗口有文本和旁边的取消按钮，这是从 balloon_map_overlay.xml 膨胀的图像视图

您可以像这样扩展 OverlayItem 包含图片：

import android.graphics.Rect;
import android.graphics.drawable.Drawable;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.OverlayItem;

public class MyItem extends OverlayItem{

    Drawable balloonPic = null;
    Rect mBounds = null;
    public MyItem(GeoPoint point, String title, String snippet, Drawable draw, Rect bounds) {
        super(point, title, snippet);

        mBounds = bounds;
        //0,0 position is the geopoint on the map. Positive is going right and down. negative goes left and up. setBounds accepts (leftBound, topbound, right bound, bottom bound)
        draw.setBounds(-draw.getIntrinsicWidth()/2, -draw.getIntrinsicHeight(), draw.getIntrinsicWidth()/2, 0);
        this.setBalloonPic(draw);

    }

    @Override
    public void setBalloonPic(Drawable draw) {

        balloonPic = draw;

    }
    @Override
    public Drawable getBalloonPic() {

        return balloonPic;

    }

}

在您的气球覆盖视图中，您需要在创建覆盖项时为图片设置数据。这将由您决定，但该示例显示了如何访问 OverlayItem 的 get 方法，并且上面的代码提示为您要显示的 Image 设置 getter 和 setter。否则，它将在每个气球上显示相同的图像。

public void setData(OverlayItem item) {
    layout.setVisibility(VISIBLE);
    if (item.getTitle() != null) {
    title.setVisibility(VISIBLE);
    title.setText(item.getTitle());
    } else {
    title.setVisibility(GONE);
    }
    if (item.getSnippet() != null) {
    snippet.setVisibility(VISIBLE);
    snippet.setText(item.getSnippet());
    } else {
    snippet.setVisibility(GONE);
    }

PS你public class MyItemizedOverlay extends BalloonItemizedOverlay<OverlayItem>需要 public class MyItemizedOverlay extends BalloonItemizedOverlay<MyItem>

于 2012-11-27T06:47:40.333 回答