地图气泡加文字

public List<OverlayItem> mGeoList = new ArrayList<OverlayItem>();

private Drawable marker;

private Activity mContext;

View mPopView = null; // 这个View是来显示界面效果，显示数据从list获取

MapView mMapView;

List<?> list; // List<?> list; 传值过来任何集合数据，不仅仅是构成mGeoList,也是mPopView，显示的信息集合。想传什么就传什么，只要确保必须有个Geopoint

 

public MyOverlay(Drawable marker, Activity context, MapView mMapView, List<?> list) {

    super(boundCenterBottom(marker)); // 这个比较重要，防止地图放大缩小的时候，便宜的

    this.marker = marker;

    this.mContext = context;

    this.mMapView = mMapView;

    this.list = list;

    addIteam();// 添加OverlayItem

    mPopView = mContext.getLayoutInflater().inflate(R.layout.popview, null);

    mMapView.addView(mPopView, new MapView.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, null,

            MapView.LayoutParams.TOP_LEFT));

    mPopView.setVisibility(View.GONE);

    populate(); // createItem(int)方法构造item。一旦有了数据，在调用其它方法前，首先调用这个方法

}

 

private void addIteam() {

    // public OverlayItem(GeoPoint point,

    // java.lang.String title,

    // java.lang.String snippet) //OverlayItem 构造方法

    // new GeoPoint((int) (mLat3 * 1E6), (int) (mLon3 * 1E6));MKPoiResult

 

    int listSize = list.size();

    for (int i = 0; i < listSize; i++) {

        GeoPoint geoPoint = ((List<MKPoiInfo>) list).get(i).pt;

        String title = ((List<MKPoiInfo>) list).get(i).name;

        String snippet = ((List<MKPoiInfo>) list).get(i).address;

        mGeoList.add(new OverlayItem(geoPoint, title, snippet));

    }

}

 

public void updateOverlay() { // 这个也是比较重要的方法的，慎用

    populate();

}

 

@Override

protected OverlayItem createItem(int i) {

    mGeoList.get(i).setMarker(new BitmapDrawable(mContext.getResources(), markerBitmap(i)));

    return mGeoList.get(i);

}

 

String s = "ABCDEFGHIJKLMNOPQWSXYZ";

String ss = "骚年祝福激情燃烧其中有个猥琐滴";

 

private Bitmap markerBitmap(int i) {

 

    Bitmap bmp = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.icon_marki_h);

    Bitmap newb = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), Config.ARGB_8888);

    Canvas canvasTmp = new Canvas(newb);

    canvasTmp.drawColor(Color.TRANSPARENT);

    Paint p = new Paint();

    p.setColor(Color.WHITE);

    p.setTextSize(18);

    canvasTmp.drawBitmap(bmp, 0, 0, p);

    canvasTmp.drawText(ss.charAt(i) + "", bmp.getWidth() / 7, bmp.getHeight() / 7 * 4, p);

    canvasTmp.save(Canvas.ALL_SAVE_FLAG);

    canvasTmp.restore();

    return newb;

}

 

@Override

public void draw(Canvas canvas, MapView mapView, boolean shadow) {

 

    // Projection接口用于屏幕像素坐标和经纬度坐标之间的变换

    Projection projection = mapView.getProjection();

    for (int index = size() - 1; index >= 0; index--) { // 遍历mGeoList

        OverlayItem overLayItem = getItem(index); // 得到给定索引的item

 

        String title = overLayItem.getTitle();

        // 把经纬度变换到相对于MapView左上角的屏幕像素坐标

        Point point = projection.toPixels(overLayItem.getPoint(), null);

        // 可在此处添加您的绘制代码

        // Paint paintText = new Paint();

        // paintText.setColor(Color.BLUE);

        // paintText.setTextSize(15);

        // canvas.drawText(title, point.x - 30, point.y, paintText); // 绘制文本

    }

    super.draw(canvas, mapView, shadow);

    // 调整一个drawable边界，使得（0，0）是这个drawable底部最后一行中心的一个像素

    boundCenterBottom(marker);

}

 

@Override

public int size() {

    return mGeoList.size();

}

 

protected boolean onTap(int i) {

    setFocus(mGeoList.get(i));

    // 更新气泡位置,并使之显示

    GeoPoint pt = mGeoList.get(i).getPoint();

    mMapView.updateViewLayout(mPopView, new MapView.LayoutParams(LayoutParams.WRAP_CONTENT,

            LayoutParams.WRAP_CONTENT, pt, MapView.LayoutParams.BOTTOM_CENTER));

    mPopView.setVisibility(View.VISIBLE);

 

    Toast.makeText(this.mContext, mGeoList.get(i).getSnippet(), Toast.LENGTH_SHORT).show();

    return true;

}

 

@Override

public boolean onTap(GeoPoint arg0, MapView arg1) {

    // TODO Auto-generated method stub

    // 消去弹出的气泡

    mPopView.setVisibility(View.GONE);

    return super.onTap(arg0, arg1);

}