Google 地图, 缩放控制, 卫星视图和地图视图

1. 界面布局, 见下图:

MapView 上面左上角地图放大按钮, 左正解缩小按钮, 右上角切换地图视图按钮, 右下角切换卫星视图按钮. 

 

2. res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><Button android:id="@+id/gpsButton"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Where am I"/><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    ><TextViewandroid:id="@+id/lbl_longitude"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Longitude:"/><TextViewandroid:id="@+id/txt_longitude"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    ><TextViewandroid:id="@+id/lbl_Latitude"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Latitude:"/><TextViewandroid:id="@+id/txt_Latitude"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"><view class="com.google.android.maps.MapView"android:id="@+id/myMap"android:layout_width="wrap_content"android:layout_height="wrap_content"android:clickable="true"android:apiKey="ABQIAAAAm2_1rdYR-zQm5djUKUH-7xT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQpjZcBBZk1RRZ-TFNJFMlbrU7oqg"/><Button android:id="@+id/buttonZoomIn" style="?android:attr/buttonStyleSmall" android:text="+" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/buttonMapView" style="?android:attr/buttonStyleSmall" android:text="Map" android:layout_alignRight="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/buttonSatView" style="?android:attr/buttonStyleSmall" android:text="Sat" android:layout_alignRight="@+id/myMap" android:layout_alignBottom="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content" /><Button android:id="@+id/buttonZoomOut" style="?android:attr/buttonStyleSmall" android:text="-" android:layout_alignBottom="@+id/myMap" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout></LinearLayout>

要使用Google Maps API , 必须生成API密钥, 参考:生成API密钥 . 上图界面使用了相对布局RelativeLayout ,  按钮使用style="?android:attr/buttonStyleSmall"  紧缩样式, 关于样式可以参考android-sdk\platforms\android-10\data\res\values\attrs.xml 

- <!--  Normal Button style.   -->   <attr name="buttonStyle" format="reference" /> - <!--  Small Button style.   -->   <attr name="buttonStyleSmall" format="reference" /> - <!--  Button style to inset into an EditText.   -->   <attr name="buttonStyleInset" format="reference" /> - <!--  ToggleButton style.   -->   <attr name="buttonStyleToggle" format="reference" /> 

3. AndroidManifest.xml , 需要添加访问权限.

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.gps"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="10" />    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>    <uses-permission android:name="android.permission.INTERNET"></uses-permission>    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".AndroidLBS"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity><uses-library android:name="com.google.android.maps" />    </application></manifest>

4. AndroidLBS.java 继承MapActivity

package com.gps;import com.google.android.maps.GeoPoint;import com.google.android.maps.MapActivity;import com.google.android.maps.MapController;import com.google.android.maps.MapView;import android.content.Context;import android.location.Criteria;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;public class AndroidLBS extends MapActivity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                final MapView mapView =  (MapView) findViewById(R.id.myMap);        final MapController mapCntrl = mapView.getController();                final Button zoomIn = (Button) findViewById(R.id.buttonZoomIn);        zoomIn.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {zoomIn(mapView, mapCntrl);}        });                final Button zoomOut = (Button) findViewById(R.id.buttonZoomOut);        zoomOut.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {zoomOut(mapView, mapCntrl);}        });                final Button gpsButton = (Button) findViewById(R.id.gpsButton);        gpsButton.setOnClickListener(new Button.OnClickListener() {public void onClick(View arg0) {LoadCoords();}        });                final Button buttonSatView = (Button) findViewById(R.id.buttonSatView);        buttonSatView.setOnClickListener(new Button.OnClickListener() {public void onClick(View arg0) {showSat(mapView);}        });                final Button buttonMapView = (Button) findViewById(R.id.buttonMapView);        buttonMapView.setOnClickListener(new Button.OnClickListener() {public void onClick(View arg0) {showMap(mapView);}        });    }        private final LocationListener locationListener = new LocationListener() {public void onStatusChanged(String provider, int status, Bundle extras) {}public void onProviderEnabled(String provider) {updateWithNewLocation(null);}public void onProviderDisabled(String provider) {}public void onLocationChanged(Location location) {updateWithNewLocation(location);}};    // 放大 +public void zoomIn(MapView mv, MapController mc){ if(mv.getZoomLevel()!=21){ mc.setZoom(mv.getZoomLevel() + 1);} } //缩小 -public void zoomOut(MapView mv, MapController mc){ if(mv.getZoomLevel()!=1){mc.setZoom(mv.getZoomLevel() - 1);}} //设置卫星视图public void showSat(MapView mv) {if (!mv.isSatellite()) {mv.setSatellite(true);}}//关闭卫星视图,切换到常规地图视图public void showMap(MapView mv) {if (mv.isSatellite()) {mv.setSatellite(false);}}    public void LoadCoords() {    LocationManager locationManager = (LocationManager) getSystemService(    Context.LOCATION_SERVICE);    //判断gps provider是否开启    System.out.println("@isProviderEnabled:" +     locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER));    Criteria criteria = new Criteria();    criteria.setAccuracy(Criteria.ACCURACY_FINE); //设置精度    criteria.setBearingRequired(false); //设置方向?    criteria.setAltitudeRequired(false); //设置海拔    criteria.setCostAllowed(true);    criteria.setPowerRequirement(Criteria.POWER_LOW);        String provider = locationManager.getBestProvider(criteria, true);    Location location = locationManager.getLastKnownLocation(provider);    System.out.println("@provider:" + provider + ", @location:" + location);        if (null == location) {    //通过GPS获取位置    location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);    if (null == location) {    //通过network获取位置    location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);    }    }        updateWithNewLocation(location);    locationManager.requestLocationUpdates(provider, 2000, 10, locationListener);    }        public void updateWithNewLocation(Location location) {    TextView txtLongitude = (TextView) findViewById(R.id.txt_longitude);    TextView txtLatitude = (TextView) findViewById(R.id.txt_Latitude);    MapView myMap = (MapView) findViewById(R.id.myMap);        if (null != location) {        Double lngPoint = location.getLongitude();        Double latPoint = location.getLatitude();        txtLongitude.setText(lngPoint.toString());        txtLatitude.setText(latPoint.toString());                //google map        GeoPoint point = new GeoPoint((int) (lngPoint.intValue()* 1E6),         (int) (latPoint.intValue() * 1E6));        MapController mapController = myMap.getController();        mapController.setCenter(point);        mapController.animateTo(point);        mapController.setZoom(9);    } else {        txtLongitude.setText("无法获取地理位置经度");        txtLatitude.setText("无法获取地理位置纬度");    }    }@Overrideprotected boolean isRouteDisplayed() {// TODO Auto-generated method stubreturn false;}}

问题及总结:  用模拟器还是没有模拟出地图来, 始终显示不出来地图, 如有高人, 望不吝赐教!