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在我的應用程序中，我在地圖2位置顯示，並用標記標記它們。現在，我想繪製他們之間的路線，我不知道我該怎麼做。我的功能畫圖應該如何？繪製2個覆蓋層之間的路線
這是我的代碼：
package com.ShoppingList.Maps;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.widget.TextView;
import android.widget.Toast;
import com.ShoppingList.R;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
import com.google.android.maps.Projection;
import java.util.ArrayList;
import java.util.List;
public class OnMap extends MapActivity {
private MapView map = null;
private MyLocationOverlay me = null;
//private myOverlay m = null;
double latitudine;
double longitudine;
double latshop;
double longshop;
String nameshop;
Canvas canvas = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.shopsonmap);
map = (MapView) findViewById(R.id.shopsonmap);
latitudine = getIntent().getDoubleExtra("latcurent", 0);
longitudine = getIntent().getDoubleExtra("longcurent", 0);
latshop = getIntent().getDoubleExtra("latshop", 0);
longshop = getIntent().getDoubleExtra("longshop", 0);
nameshop = getIntent().getStringExtra("nameshop");
GeoPoint p1 = new GeoPoint((int) latitudine, (int) longitudine);
GeoPoint p2 = new GeoPoint((int) latshop, (int) longshop);
map.getController().setCenter(getPoint(latitudine, longitudine));
map.getController().setZoom(15);
map.setBuiltInZoomControls(true);
map.setSatellite(false);
map.setStreetView(true);
map.invalidate();
Drawable marker = getResources().getDrawable(R.drawable.marker);
marker.setBounds(0, 0, marker.getIntrinsicWidth(), marker
.getIntrinsicHeight());
map.getOverlays().add(new SitesOverlay(marker));
me = new MyLocationOverlay(this, map);
map.getOverlays().add(me);
}
/*class myOverlay extends Overlay {
GeoPoint gp1;
GeoPoint gp2;
public myOverlay(GeoPoint gp1, GeoPoint gp2) {
this.gp1 = gp1;
this.gp2 = gp2;
}
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
Projection projection = mapView.getProjection();
Paint mPaint = new Paint();
Point from = new Point();
projection.toPixels(gp1, from);
mPaint.setColor(Color.BLUE);
Point to = new Point();
projection.toPixels(gp2, to);
mPaint.setStrokeWidth(9);
mPaint.setAlpha(120);
canvas.drawLine(from.x, from.y, to.x, to.y, mPaint);
super.draw(canvas, mapView, shadow);
}
}*/
@Override
public void onResume() {
super.onResume();
me.enableCompass();
}
@Override
public void onPause() {
super.onPause();
me.disableCompass();
}
@Override
protected boolean isRouteDisplayed() {
return (false);
}
private GeoPoint getPoint(double lat, double lon) {
return (new GeoPoint((int) (lat * 1000000.0), (int) (lon * 1000000.0)));
}
private class SitesOverlay extends ItemizedOverlay<OverlayItem> {
private List<OverlayItem> items = new ArrayList<OverlayItem>();
private Drawable marker = null;
public SitesOverlay(Drawable marker) {
super(marker);
this.marker = marker;
items.add(new OverlayItem(getPoint(latitudine, longitudine),
"Your location", "You are here!"));
items.add(new OverlayItem(getPoint(latshop, longshop), "The shop",
"The shop " + nameshop + " is here"));
populate();
}
@Override
protected OverlayItem createItem(int i) {
return (items.get(i));
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
super.draw(canvas, mapView, shadow);
boundCenterBottom(marker);
}
@Override
protected boolean onTap(int i) {
Toast.makeText(OnMap.this, items.get(i).getSnippet(),
Toast.LENGTH_SHORT).show();
return (true);
}
@Override
public int size() {
return (items.size());
}
}
}
謝謝..