Question

所以当我点击一个逐项的叠加项目时，我只是显示一个简单的对话框，我想在下面的行中创建更多的东西

On tap dialog

我如何为Android手机＆gt;做这个？

Answer 1

当您覆盖ItemizedOverlay时，会有受保护的onTap方法。它有项目索引作为参数。您应该覆盖onTap并使用此索引来获取正确的数据对象。 E.g：

@Override
protected boolean onTap(int index) {
    getItem(index); \\your overlay item
    return true;
}

然后你应该从代码创建自定义对话框或膨胀xml布局，使用正确的布局参数将其添加到MapView上：

MapView.LayoutParams params = new MapView.LayoutParams(LayoutParams.WRAP_CONTENT,     
    LayoutParams.WRAP_CONTENT, point, 0, 0, MapView.LayoutParams.BOTTOM_CENTER);
    params.mode = MapView.LayoutParams.MODE_MAP;            
    MV.addView(popup, params);

MV - 你的MapView实例; point - 你的Overlay项目GeoPoint; 弹出窗口 - 您的自定义对话框视图。

Answer 2

我刚刚找到了一种方法：扩展OverlayItem并覆盖getMarker以返回新的drawable。

package this.is.funny;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;

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

public class MyOverlayItem extends OverlayItem{
    private String title;
    private Context ctx;
    private NinePatchDrawable npd;
    private Rect textBox;
    private Paint p;

public MyOverlayItem(Context ctx,GeoPoint point, String title, String snippet) {
    super(point, title, snippet);
    this.title=title;
    this.ctx=ctx;
    p=new Paint();

}


@Override
public Drawable getMarker(int stateBitset) {
    return new MyDrawable();
}
/**
 * 
 * I believe this method is the cleaniest way to do what we want. Not sure about it
 * @author emmanuel
 * This private class is a custom drawable with some text inside.
 */
private class MyDrawable extends Drawable{

    @Override
    public void draw(Canvas c) {            

        textBox = new Rect();
                    //this is ugly
        p.setFakeBoldText(true);
        p.setTextSize(16);
        p.setAlpha(50);
        p.getTextBounds(title, 0, title.length(), textBox);
        //p.setAlpha(255);
        NinePatchDrawable npd;
        npd=(NinePatchDrawable) 


ctx.getResources().getDrawable(R.drawable.geoloc);

        npd.setBounds(-(textBox.width()/2+15),-(textBox.height()+30),textBox.width()/2+15,0);
        npd.draw(c);

        p.setColor(Color.WHITE);
        p.setAlpha(255);
        c.drawText(title,-textBox.width()/2,-30,p);


    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    @Override
    public void setAlpha(int alpha) {
        // TODO Auto-generated method stub

    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        // TODO Auto-generated method stub

    }

}

}

如何为逐项列表项创建自定义对话框？

2 个答案: