【代碼】Android 客戶端GPS定位源碼

AndroidManifest.xml文件配置

<?xml version="1.0"encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="cn.itcast.main"
     android:versionCode="1"
     android:versionName="1.0">
    <application android:icon="@drawable/icon"android:label="@string/app_name">
        <activity android:name=".Main"
                  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>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FIND_LOCATION"/>
</manifest>

Main.java文件

package cn.itcast.main;
import java.util.List;
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 com.google.android.maps.Overlay;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.TextView;
public class Main extends MapActivity{
    private MapController mapController;
    private GeoPoint geoPoint;
    private String msg;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //獲得mapview
        MapView mapView=(MapView) this.findViewById(R.id.mapview);
        //地圖的顯示格式爲交通圖
        mapView.setTraffic(true);
        //設置可控
        mapView.setClickable(true);
        mapView.setEnabled(true);
        mapView.setBuiltInZoomControls(true);
        
        //得到gps設備的訪問
        LocationManager locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
        //設置gps定位配置
        Criteria criteria=new Criteria();
         //設置顯示精度
        criteria.setAccuracy(Criteria.ACCURACY_COARSE);
        //是否獲得海拔數據
        criteria.setAltitudeRequired(false);
        //是否獲得方向數據
        criteria.setBearingRequired(false);
        //是否允許運營商計費
        criteria.setCostAllowed(true);
        //設置耗電程度
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        
        //獲得服務供應商
        Stringprovider=locationManager.getBestProvider(criteria, true);
        //獲取上一個定位點
        Locationlocation=locationManager.getLastKnownLocation(provider);
        //獲得gps定位座標信息
        Double latitude=location.getLatitude()*1E6;
        Double longitude=location.getLongitude()*1E6;
        //獲得衛星定位點
        geoPoint=new GeoPoint(latitude.intValue(),longitude.intValue());
        
        //獲得地圖控制器
        mapController=mapView.getController();
        //設置地圖顯示初始化精度
        mapController.setZoom(12);
        mapController.animateTo(geoPoint);
        //實例化自定義繪圖層
        MyOverlay myOverlay=new MyOverlay();
        //爲mapview添加繪圖層
        mapView.getOverlays().add(myOverlay);
        //定義一個final，TextView，以備子類引用
       final TextView textView=(TextView) findViewById(R.id.textview);
       LocationListener locationListener=new LocationListener(){
      
       @Override
       public void onStatusChanged(String provider, int status, Bundle extras) {
           
           
       }
      
       @Override
       public void onProviderEnabled(String provider) {
           // TODO Auto-generatedmethod stub
           
       }
      
       @Override
       public void onProviderDisabled(String provider) {
           // TODO Auto-generatedmethod stub
           
       }
      
       @Override
       public void onLocationChanged(Location location) {
           Double latitude=location.getLatitude()*1E6;
           Double longitude=location.getLongitude()*1E6;
           try {
              //獲得精度緯度字符串
              msg = "經度：" + location.getLongitude() + "\n";
              msg += "緯度：" + location.getLatitude() + "\n";
              //根據經緯度獲得改點地址信息
              Geocoder gc=new Geocoder(Main.this);
              List<Address> addresses=gc.getFromLocation(latitude, longitude,1);
              if (addresses.size()>0) {
                  //獲得地址信息
                  msg+="AddressLine:"+addresses.get(0).getAddressLine(0)+"\n";
                  //獲得國家名
                  msg += "CountryName：" + addresses.get(0).getCountryName()+"\n";
                  msg += "Locality：" + addresses.get(0).getLocality() + "\n";
                  msg += "FeatureName：" + addresses.get(0).getFeatureName();
              }
              textView.setText(msg);
           } catch (Exception e) {
              e.printStackTrace();
           }
           
       }
    };
        //註冊位置監聽器，1秒鐘掃描1次
       locationManager.requestLocationUpdates(provider, 1000, 0, locationListener);
        
    }
   
    class MyOverlay extends Overlay{
     //保證觸控事件不重複操作
     private int count=0;
       @Override
       public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
              long when) {
           //定義畫筆
           Paint paint=new Paint();
           paint.setColor(Color.RED);
           //定義屏幕點
           Point screenPoint=new Point();
           //gps點轉屏幕點
           mapView.getProjection().toPixels(geoPoint, screenPoint);
           //獲得gps標誌點圖片
           Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.flag);
           //繪製gps點圖片
           canvas.drawBitmap(bitmap,screenPoint.x,screenPoint.y, paint);
           //繪製文字說明
           canvas.drawText("當前位置", screenPoint.x, screenPoint.y, paint);
           return super.draw(canvas, mapView, shadow, when);
       }
       @Override
       public boolean onTouchEvent(MotionEvent e, MapView mapView) {
           //定義一個屏幕點
           Point screenPoint=new Point();
           //把gps點變成屏幕點
           mapView.getProjection().toPixels(geoPoint, screenPoint);
           //獲得觸點座標
           int currentX=(int) e.getX();
           int currentY=(int) e.getY();
           //在50，30範圍內觸碰，顯示當前經緯度
           if ((currentX-screenPoint.x)>=0&&(currentX-screenPoint.x)<50
                  &&(currentY-screenPoint.y>=0)&&(currentY-screenPoint.y)<30) {
              if (count==0) {
                  new AlertDialog.Builder(Main.this).setMessage(msg)
                  .setPositiveButton("確定",new OnClickListener(){
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         count=0;
                     }
                     
                  }).show();
              }
              count++;
           }
           return super.onTouchEvent(e, mapView);
       }
     
    }
   
   
    @Override
    protected boolean isRouteDisplayed() {
       // TODO Auto-generatedmethod stub
       return false;
    }
}

注1：如果你的手機上沒有gps定位系統，會有以下錯誤
08-10 13:04:55.610:ERROR/AndroidRuntime(492): java.lang.RuntimeException: Unable to start activityComponentInfo{cn.itcast.main/cn.itcast.main.Main}: java.lang.IllegalArgumentException:provider==null
注2：記得去google官網
http://code.google.com/intl/zh-CN/android/maps-api-signup.html
申請自己機器的apikey
C:\Documents and Settings\Administrator\.android>keytool -list-keystore debug.kEystore 
默認密碼android
我機器的apikey，你用不好使

<com.google.android.maps.MapView
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
android:apiKey="0EITsWoXq7NC_mgKW6yIxIViNLhMGsIW4dbmlsg
                 />

最終實現效果：隨着android客戶端得移動，在地圖上提供精確的當前所在位置

以上是本文關於Android 客戶端GPS定位的源碼，希望本文對廣大安卓開發者有所幫助，感謝閱讀本文。更多安卓技術問題歡迎加羣探討：278744577，驗證碼:csl,不寫驗證不予通過喲~