我下载了一个教程Android项目，该项目专注于使用GPS创建路径并在屏幕上显示。
问题伴随着项目使用的导入语句：
com.google.android.maps.GeoPoint;
com.google.android.maps.MapActivity;
com.google.android.maps.MapController;
com.google.android.maps.MapView;
错误表明"the import com.google cannot be resolved"
我知道此时您需要下载Google Play服务库以获取v2 Maps API，但这就是它。我一直在搜索2011-2013与此主题相关的帖子，但解决方案无效。
我要做的就是更新项目，使其适用于当前的设备
项目在这里找到
清单：https://code.google.com/p/routetracker2-amasio2012/source/browse/AndroidManifest.xml
主要活动：https://code.google.com/p/routetracker2-amasio2012/source/browse/RouteTracker.java
其他课程：
// RouteOverlay.java
// Draws route on MapView.
package com.deitel.routetracker;
import java.util.ArrayList;
import java.util.List;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.location.Location;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
public class RouteOverlay extends Overlay
{
private List<Location> locations; // stores Location tracking data
private Paint pathPaint; // Paint information for the Path
private Paint positionPaint; // Paint information for current position
private final int POSITION_MARKER = 10; // marker frequency
public RouteOverlay()
{
// Paint for drawing Path as a red line with a width of 5
pathPaint = new Paint();
pathPaint.setAntiAlias(true);
pathPaint.setColor(Color.RED);
pathPaint.setStyle(Paint.Style.STROKE);
pathPaint.setStrokeWidth(5);
locations = new ArrayList<Location>(); // initialize points
// Paint for drawing black circle every POSITION_MARKER Locations
positionPaint = new Paint();
positionPaint.setAntiAlias(true);
positionPaint.setStyle(Paint.Style.FILL);
} // end RouteOverlay constructor
// add new Location to List of Locations
public void addPoint(Location location)
{
locations.add(location);
} // end method addPoint
// reset the Overlay for tracking a new route
public void reset()
{
locations.clear(); // delete all prior Locations
} // end method reset
// draw this Overlay on top of the given MapView
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow)
{
super.draw(canvas, mapView, shadow); // call super's draw method
Path newPath = new Path(); // get a new Path
Location previous = null; // initialize previous Location to null
// for each Location
for (int i = 0; i < locations.size(); ++i)
{
Location location = locations.get(i);
// convert Location to GeoPoint
Double newLatitude = location.getLatitude() * 1E6;
Double newLongitude = location.getLongitude() * 1E6;
GeoPoint newPoint = new GeoPoint(newLatitude.intValue(),
newLongitude.intValue());
// convert the GeoPoint to point on the screen
Point newScreenPoints = new Point();
mapView.getProjection().toPixels(newPoint, newScreenPoints);
if (previous != null) // if this is not the first Location
{
// get GeoPoint for the previous Location
Double oldLatitude = previous.getLatitude() * 1E6;
Double oldLongitude = previous.getLongitude() * 1E6;
GeoPoint oldPoint = new GeoPoint(oldLatitude.intValue(),
oldLongitude.intValue());
// convert the GeoPoint to point on the screen
Point oldScreenPoints = new Point();
mapView.getProjection().toPixels(oldPoint, oldScreenPoints);
// add the new point to the Path
newPath.quadTo(oldScreenPoints.x, oldScreenPoints.y,
(newScreenPoints.x + oldScreenPoints.x) / 2,
(newScreenPoints.y + oldScreenPoints.y) / 2);
// possibly draw a black dot for current position
if ((i % POSITION_MARKER) == 0)
canvas.drawCircle(newScreenPoints.x, newScreenPoints.y, 10,
positionPaint);
} // end if
else
{
// move to the first Location
newPath.moveTo(newScreenPoints.x, newScreenPoints.y);
} // end else
previous = location; // store location
} // end for
canvas.drawPath(newPath, pathPaint); // draw the path
} // end method draw
} // end class RouteOverlay
/**************************************************************************
* (C) Copyright 1992-2012 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/
// BearingFrameLayout.java
// Rotates MapView according to device's bearing.
package com.deitel.routetracker;
import com.google.android.maps.MapView;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.view.Display;
import android.widget.FrameLayout;
public class BearingFrameLayout extends FrameLayout
{
private int scale = 0; // amount to scale layout
private MapView mapView; // displays Google maps
private float bearing = 0f; // compass bearing
// returns layout parameters for MapView
public LayoutParams getChildLayoutParams()
{
Display display =
((Activity) getContext()).getWindowManager().getDefaultDisplay();
int w = display.getWidth();
int h = display.getHeight();
scale = (int) Math.sqrt((w * w) + (h * h));
return new LayoutParams(scale, scale);
} // end method getChildLayoutParams
// public constructor for BearingFrameLayout
public BearingFrameLayout(Context context, String apiKey)
{
super(context); // call super constructor
mapView = new MapView(context, apiKey); // create new MapView
mapView.setClickable(true); // allow user interactions with the map
mapView.setEnabled(true); // enables the MapView to generate events
mapView.setSatellite(false); // display map image
mapView.setBuiltInZoomControls(true); // enable zoom controls
// set MapView's layout
mapView.setLayoutParams(getChildLayoutParams());
addView(mapView); // add MapView to this layout
} // end BearingFrameLayout constructor
// rotates the map according to bearing
@Override
protected void dispatchDraw(Canvas canvas)
{
if (bearing >= 0) // if the bearing is greater than 0
{
// get canvas dimensions
int canvasWidth = canvas.getWidth();
int canvasHeight = canvas.getHeight();
// dimensions of the scaled canvas
int width = scale;
int height = scale;
// center of scaled canvas
int centerXScaled = width / 2;
int centerYScaled = height / 2;
// center of screen canvas
int centerX = canvasWidth / 2;
int centerY = canvasHeight / 2;
// move center of scaled area to center of actual screen
canvas.translate(-(centerXScaled - centerX),
-(centerYScaled - centerY));
// rotate around center of screen
canvas.rotate(-bearing, centerXScaled, centerYScaled);
} // end if
super.dispatchDraw(canvas); // draw child Views of this layout
} // end method dispatchDraw
// set the compass bearing
public void setBearing(float bearing)
{
this.bearing = bearing;
} // end method setCompassBearing
// return the MapView
public MapView getMapview()
{
return mapView;
} // end method getMapView
} // end class BearingFrameLayout
/**************************************************************************
* (C) Copyright 1992-2012 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/