MapView的使用

时间:2014-10-08 09:57:15
【文件属性】:

文件名称:MapView的使用

文件大小:80KB

文件格式:DOC

更新时间:2014-10-08 09:57:15

MapView的使用

在论坛里看到一篇 "MapView和其它控件一起显示 " 的帖子, 那是很老的一篇帖子了, 很多朋友都说无法在android SDK 1.0上运行。既然那么多人关心,我在这里就把它重写一遍,顺便加入了一些新的功能 ,感兴趣的朋友可以看看。 第一步,当然是增加map的支持了。在Android Manifest.xml中增加以下语句: 第二步, 传说中的Layout: 然后, 创建一个MapViewActivity: public class MapViewActivity extends MapActivity { MapView mapView; MapController mapController; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); mapView = (MapView) findViewById(R.id.map); mapController = mapView.getController(); mapController.setZoom(15); updateView(); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } private void updateView(){ Double lat = 31.23717*1E6; Double lng = 121.50811*1E6; GeoPoint point = new GeoPoint(lat.intValue(), lng.intValue()); mapController.setCenter(point); } } 好了,你的MapView上面就多了一个EditText了。 接着,我希望在MapView中增加ZoomIn和ZoomOut的功能(鄙视一下Google ,缺省的MapView居然连这个功能都没有) 1. 在我们的Layout中增加一段: 2. 在onCreate函数中增加: ViewGroup zoom=(ViewGroup)findViewById(R.id.zoom); zoom.addView(mapView.getZoomControls()); 现在在你的地图中点一下,屏幕左下角,是不是出现了一个Zoom Table? 这才是一个最基本的地图功能嘛。 以下技巧是基于SDK 1.0的) 一、申请Apikey,并放在正确的位置http://iceskysl.1sters.com/?action=show&id=441 这个应该都知道,但是是申请得到的key放哪里很多人不知道,可以放在 1、XML布局文件中 申请APIkey的时候,类似命令如下: C:\Documents and Settings\Administrator\Local Settings\Application Data\Android> "C:\Program Files\Java\jdk1.6.0_10\bin\keytool.exe" -list -alias androiddebugkey -keystore debug.keystore -storepass android -keypass android androiddebugkey, 2008-9-23, PrivateKeyEntry, 认证指纹 (MD5): 1D:68:43:7C:14:2E:CC:CA:35:8B:1F:93:A7:91:AD:45 2、java中 mMapView = new MapView(this, "01Yu9W3X3vbpYT3x33chPxxx7U1Z6jy8WYZXNFA"); 二、记得导入uses-library 由于1.0版本的修改,使得map包不再是默认的了,使用的时候需要在manifest中的application节点下加入 否则,你将遇到可恶的“java.lang.NoClassDefFoundError: ”,切记! 三、需要给予一定的权限 因为要使用GoogleMAP的service,所以需要 如果需要GPS等应用,还需要 四、Activity需要继承自MapActivity 类似如下代码; package com.iceskysl.showmap; import com.google.android.maps.MapActivity; import android.os.Bundle; public class ShowMap extends MapActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } } 在Android中使用其提供的Sensor非常方便,如下是强制Landscape时候的情况: values[0]:方位角(水平旋转角),简单的说就是手机的头现在朝向哪个方位,0=北、90=东、180=南、270=西(可是好像不太准) values[1]:纵向旋转角,0=面朝上平置、-90=垂直向上、-180/180=面朝下平置、90=垂直向下 values[2]:橫向旋转角,0=朝前、90=往右倒、-90=往左倒 在Android中计算GPS两点间的距离/速度 Q:how to get distance between two GeoPoints in sdk 1.0 ? MapPoint.distanceSquared(MapPoint) is gone thaks!! A:you'll need to brush up on your trigonometry, and first compute the Haversine function (this is the standard way of doing it). In order to use the Java trig functions, you'll have to first convert all your angles from degrees to radians. Given two longitude/latitude pairs, and the earth's average radius (assume 6356.78km for your calculations), you can calculate the distance between the 2 points via this Java code: double EarthRad = 6356.78; // in km ! // first convert to radians... double geo1_lat = geo1.getLatitude()*java.lang.Math.PI/360; double geo1_lng = geo1.getLongitude()*java.lang.Math.PI/360; double geo2_lat = geo2.getLatitude()*java.lang.Math.PI/360; double geo2_lng = geo2.getLongitude()*java.lang.Math.PI/360; double deltaLat = java.lang.Math.abs(java.lang.Math.abs(geo2_lat) - java.lang.Math.abs(geo1_lat)); double deltaLng = java.lang.Math.abs(java.lang.Math.abs(geo2_lng) - java.lang.Math.abs(geo1_lng)); double dist = 2*EarthRad*java.lang.Math.asin(java.lang.Math.sqrt(haversine(deltaLat) + java.lang.Math.cos(pair1_lat) *java.lang.Math.cos(pair1_lng)*haversine(deltaLng))); Where "dist" now contains the distance between along the earth's surface. You can find the Haversine function trig equation by Googling it, then construct a method that returns the appropriate value. Computing the speed is straightforward: you know your sampling frequency, and you now know the distance between the most recent two points, so, employee speed = distance / sampling interval 参考:http://www.anddev.org/distance_between_two_geopoints_in_sdk10-t4195.html http://www.anddev.org/calculating_distance_between_two_gps_points-t3708.html 获得maps api的方法:本人的 打开Eclipse--->Windows--->Preferences--->Android--->Build 查看默认的debug keystore位置,我的是C:\Documents and Settings\Administrator\Local Settings\Application Data\Android\debug.keystore 启动命令行 直接 输入如下内容: keytool -list -alias androiddebugkey -keystore "C:\Documents and Settings\Administrator\Local Settings\Application Data\Android\debug.keystore" -storepass android -keypass android 结果如下:Microsoft Windows XP [版本 5.1.2600] (C) 版权所有 1985-2001 Microsoft Corp. C:\Documents and Settings\Administrator>keytool -list -alias androiddebugkey -ke ystore "C:\Documents and Settings\Administrator\Local Settings\Application Data\ Android\debug.keystore" -storepass android -keypass android androiddebugkey, 2009-3-12, keyEntry, 认证指纹 (MD5): 0F:C3:F0:C6:32:49:CE:C6:0E:18:57:CA:48:D7:CD:12 C:\Documents and Settings\Administrator> 屏幕图如下: 打开http://code.google.com/intl/zh-CN/android/maps-api-signup.html 填入你的认证指纹(MD5)即可获得apiKey了 0Ua9BENcUvNLXp8wn_vXXvVf70rLTYixrNxbHNQ http://www.androidcompetencycenter.com/category/android-api/ http://duzike.blogbus.com/logs/35386568.html http://www.helloandroid.com/node/206 http://www.diybl.com/course/6_system/linux/Linuxjs/2008819/136351.html 根据输入城市名动态加载google地图 文章出处:http://www.diybl.com/course/6_system/linux/Linuxjs/2008819/136351.html 1)SendCityName.java: package com.google.android.citygmapview; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; public class SendCityName extends Activity { protected static final int REQUEST_SEND_DATA = 0; /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); getAndSendCityName(); } public void getAndSendCityName() { Button btn = (Button)findViewById(R.id.confirm); btn.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { EditText edt=(EditText)SendCityName.this.findViewById(R.id.edt); Intent intent = new Intent(); intent.setClass(SendCityName.this, ShowGmapView.class); if(edt.getText().length()!= 0) { String data = edt.getText().toString(); String name="data"; intent.putExtra(name, data); startSubActivity(intent,REQUEST_SEND_DATA); } } }); } } 说明: if(edt.getText().length()!= 0)用来处理用户输入为空的情况,为空时数据不会传递到另外一个activity中去,节省资源。 (2)ShowGmapView.java: package com.google.android.citygmapview; import java.io.IOException; import java.util.Locale; import com.google.android.location.GmmGeocoder; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import com.google.android.maps.Point; import android.location.Address; import android.os.Bundle; import android.util.Log; import android.view.KeyEvent; import android.view.Menu; import android.view.Menu.Item; public class ShowGmapView extends MapActivity { private static final int EXIT_ID = 0; private MapView myMapView; private Address[] maddrs; protected void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.gmap_view); Bundle extras = getIntent().getExtras(); String name="data"; if(extras != null) { String data1 = extras.getString(name); GmmGeocoder mgc = new GmmGeocoder(Locale.getDefault()); try { maddrs = mgc.query(data1, GmmGeocoder.QUERY_TYPE_LOCATION, 0, 0, 180.0, 360.0); if (null!=maddrs && maddrs.length > 0) { Log.d("CountryName: ", maddrs[0].getCountryName()); maddrs[0].getLatitude(); } else { setResult(RESULT_OK, null, extras); finish(); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } myMapView = new MapView(this); if(null!=maddrs && maddrs.length > 0) { Point p = new Point((int) (maddrs[0].getLatitude() * 1000000), (int) (maddrs[0].getLongitude() * 1000000)); /** 地图控制器 */ MapController mc = myMapView.getController(); mc.animateTo(p); /** 21是最zoom in的一级,一共是1-21级 */ mc.zoomTo(21); setContentView(myMapView); /** 切换到卫星地图 */ myMapView.toggleSatellite(); } setResult(RESULT_OK, null, extras); } } 文章出处:http://www.diybl.com/course/6_system/linux/Linuxjs/2008819/136351.html public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_I) { /** zoom in */ myMapView.getController().zoomTo(myMapView.getZoomLevel() + 1); return true; } else if (keyCode == KeyEvent.KEYCODE_O) { /** zoom out */ myMapView.getController().zoomTo(myMapView.getZoomLevel() - 1); return true; } else if (keyCode == KeyEvent.KEYCODE_S) { /** 卫星地图 */ myMapView.toggleSatellite(); return true; } else if (keyCode == KeyEvent.KEYCODE_T) { /** traffic,路况 */ myMapView.toggleTraffic(); return true; } return false; } 文章出处:http://www.diybl.com/course/6_system/linux/Linuxjs/2008819/136351_2.html @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(0, EXIT_ID, R.string.exit_gmap); return true; } @Override public boolean onMenuItemSelected(int featureId, Item item) { super.onMenuItemSelected(featureId, item); switch(item.getId()) { case EXIT_ID: finish(); break; } return true; } } 说明: 在开始设计时采用了Geocoder这个类,但似乎通过它获取的经纬度为空值,所以最后采取了GmmGeocoder,并能达到目的。 图示: (3)main.xml: (4)gmap_view.xml: (5)strings.xml: city gmap view confirm Exit google map (6)AndroidManifest.xml: 文章出处:http://www.diybl.com/course/6_system/linux/Linuxjs/2008819/136351_3.html


网友评论

  • 有一定的帮助,值得一看