我有静态地图，我知道纬度和经度的中心坐标，缩放级别和图像尺寸。 我不明白谷歌静态地图是否已经扁平化，每个像素的纬度和经度在任何地方都是相同的。如果它不是那样我想知道如何计算每个像素的latidude和经度，然后计算每像素的米数，以及这些值如何随纬度变化。 附：我正在开发一个下载静态地图并计算2点之间距离的Android应用程序，但我已经做到了这一点，因为lat和每个像素的长度是相同的...并且不依赖于纬度（地球上的位置） 这是我的主要活动
package com.mnav.nav;
import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.view.View.*;
import java.net.*;
import org.apache.http.*;
import android.graphics.*;
import java.io.*;
import android.graphics.drawable.*;
public class MainActivity extends Activity
{ Button start, dist;
TextView txt;
EditText lat, longit, zoom;
ImageView img;
Handler mhandler ;
Bitmap bit, original;
Boolean run = false, firstpoint = false, secondpoint = false;
String z, latitude, longitude;
int level;
int[] pointa = new int[2];
int[] pointb = new int[2];
double unit;
int maxx, maxy, minx, miny, distx, disty, distance1;
double distance;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
start=(Button)findViewById(R.id.button);
lat = (EditText)findViewById(R.id.latitude);
longit = (EditText)findViewById(R.id.longitude);
img = (ImageView)findViewById(R.id.img);
zoom =(EditText)findViewById(R.id.zoom);
dist = (Button)findViewById(R.id.dist);
txt = (TextView)findViewById(R.id.txt);
mhandler = new Handler();
start.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{ z = zoom.getText().toString();
latitude = lat.getText().toString();
longitude = longit.getText().toString();
Thread thr = new Thread(new GetImage());
thr.start();
}
});
img.setOnTouchListener(new OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{ int i, j;
int x = (int)event.getX();
int vertical = (int)event.getY();
if(secondpoint==true)
{ bit = original.copy(Bitmap.Config.ARGB_4444, true);
img.setImageBitmap(bit);
secondpoint = false;
}
txt.setText(Integer.toString(x)+ " "+Integer.toString(vertical));
for (i = x-2; i < x+3; i++)
{
for(j=vertical-2; j<vertical+3; j++)
{
bit.setPixel(i,j, Color.WHITE);
}
}
bit.setPixel(x,vertical,Color.GREEN);
img.setImageBitmap(bit);
if(firstpoint)
{
pointb[0] = x; pointb[1]=vertical;
secondpoint = true;
firstpoint = false;
}
else
{
pointa[0]=x; pointa[1]=vertical;
firstpoint=true;
}
return false;
}
});
dist.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View p1)
{
unit = 0.1412/800;
unit = unit*500;
level = Integer.parseInt(z);
if(level == 20)
{
unit = unit;
}
else
if(level == 19)
{
unit = unit*2;
}
else
if(level==18)
{
unit = unit*4;
}
else
if(level == 17)
{
unit =unit*8;
}
else
if(level==16)
{
unit = unit*16;
}
else
if(level==15)
{
unit = unit*32;
}
else
if(level==14)
{
unit = unit*64;
}
else
if(level==13)
{
unit = unit*128;
}
else
if(level == 12)
{
unit = unit*256;
}
else
if(level==11)
{
unit = unit*512;
}
else
if(level==10)
{
unit = unit*1024;
}
distx = Math.abs(pointa[0]-pointb[0]);
disty= Math.abs(pointa[1]-pointb[1]);
distance1 = distx*distx+disty*disty;
distance = Math.sqrt(distance1);
distance = unit*distance;
txt.setText(Double.toString(distance)+" meters");
}
});
}
public class GetImage implements Runnable
{
String Url = "http://maps.google.com/staticmap?center=" + latitude+","+longitude+"&format=png&zoom="+ z +"&size=500x500&scale=1&maptype=hybrid&key=ABQIAAAA-O3c-Om9OcvXMOJXreXHAxRexG7zW5nSjltmIc1ZE-b8yotBWhQYQEU3J87QIBc4nfuySpoW_K6woA";
Bitmap bmp;
@Override
public void run()
{
try
{ mhandler.post(new Runnable()
{
@Override
public void run()
{
txt.setText("Wait...file is downloading...");
}
});
bmp = BitmapFactory.decodeStream((InputStream)new URL(Url).getContent());
}
catch (IOException e)
{ mhandler.post(new Runnable()
{
@Override
public void run()
{
// TODO: Implement this method
Toast.makeText(getApplicationContext(), "Something wrong just happend", Toast.LENGTH_LONG).show();
}
});
e.printStackTrace();
}
mhandler.post(new Runnable()
{
@Override
public void run()
{
if (bmp!=null)
{ txt.setText("Map downloaded..");
img.setImageBitmap(bmp);
bit = ((BitmapDrawable)img.getDrawable()).getBitmap();
bit = bit.copy(Bitmap.Config.ARGB_4444, true);
original = bit.copy(Bitmap.Config.ARGB_4444, true);
}
else
{
mhandler.post(new Runnable()
{
@Override
public void run()
{
Toast.makeText(getApplicationContext(), "null bitmap, sorry", Toast.LENGTH_LONG).show();
}
});
}
}
});
}
}
}