Android定位&地图&导航——基于百度地图移动获取位置和自动定位

一、问题描述

使用百度地图实现如图所示应用，首先自动定位当前我起始位置（小圆点位置），并跟随移动不断自动定位我的当前位置

百度Api不同版本使用会有些差异，本例中加入lib如下：

二、编写MyApplication类

public class MyApplication extends Application {
    static MyApplication myApplication;
    BMapManager mBMapManager = null;
    String mStrKey = "7ZfuRcOx1G3oZ8TKuTNGm4sO";
    boolean m_bKeyRight = true; // 授权Key正确，验证通过
    private List<Activity> activityList = new LinkedList<Activity>();
    @Override
    public void onCreate() {
        myApplication = this;
        initEngineManager(this);
        super.onCreate();
    }
    public void initEngineManager(Context context) {
        if (mBMapManager == null) {
            mBMapManager = new BMapManager(context);
            Toast.makeText(MyApplication.getInstance().getApplicationContext(),
                    "BMapManager  初始化SUCSUC!", Toast.LENGTH_LONG).show();
        }
        if (!mBMapManager.init(mStrKey, new MyGeneralListener())) {
            Toast.makeText(MyApplication.getInstance().getApplicationContext(),
                    "BMapManager  初始化错误!", Toast.LENGTH_LONG).show();
        }
    }

    public static MyApplication getInstance() {
        if (myApplication == null) {
            myApplication = new MyApplication();
        }
        return myApplication;
    }
    public void addActivity(Activity activity) {
        activityList.add(activity);
    }
    public void exit() {
        for (Activity activity : activityList) {
            activity.finish();
        }
        System.exit(0);
    }
    // 常用事件监听，用来处理通常的网络错误，授权验证错误等
    static class MyGeneralListener implements MKGeneralListener {
        public void onGetNetworkState(int iError) {
            if (iError == MKEvent.ERROR_NETWORK_CONNECT) {
                Toast.makeText(
                        MyApplication.getInstance().getApplicationContext(),
                        "您的网络出错啦！", Toast.LENGTH_LONG).show();
            } else if (iError == MKEvent.ERROR_NETWORK_DATA) {
                Toast.makeText(
                        MyApplication.getInstance().getApplicationContext(),
                        "输入正确的检索条件！", Toast.LENGTH_LONG).show();
            }
            // ...
        }
        public void onGetPermissionState(int iError) {
            if (iError == MKEvent.ERROR_PERMISSION_DENIED) {
                // 授权Key错误：
                Toast.makeText(
                        MyApplication.getInstance().getApplicationContext(),
                        "请输入正确的授权Key！",
                        Toast.LENGTH_LONG).show();
                MyApplication.getInstance().m_bKeyRight = false;
            }
        }

    }
}

三、编写主程序MainActivity，显示当前所处位置

主程序MainActity：

public class MainActivity extends Activity {
    public MyApplication app;
    static MapView mMapView = null;
    public MKMapViewListener mMapListener = null;
    MyLocationOverlay myLocationOverlay = null;
    // 定位相关
    LocationClient mLocClient;
    public NotifyLister mNotifyer = null;
    public MyLocationListenner myListener = new MyLocationListenner();
    LocationData locData = null;
    private MapController mMapController = null;

    static MKSearch mkSerach;

    Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            Toast.makeText(MainActivity.this, "msg:" + msg.what,
                    Toast.LENGTH_SHORT).show();
        };
    };
    static TextView showAddr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        showAddr = (TextView) findViewById(R.id.showAddr);
        MyIcon mi = new MyIcon(this);
        //在屏幕中心点添加接我图标
        getWindow().addContentView(
                mi,
                new LayoutParams(LayoutParams.FILL_PARENT,
                        LayoutParams.FILL_PARENT));
        MyIcon2 m2 = new MyIcon2(this);
        getWindow().addContentView(
                m2,
                new LayoutParams(LayoutParams.FILL_PARENT,
                        LayoutParams.FILL_PARENT));

        mMapView = (MapView) findViewById(R.id.bmapsView);
        mMapController = mMapView.getController();
        initMapView();
        app = MyApplication.getInstance();
        mLocClient = new LocationClient(this);
        mLocClient.registerLocationListener(myListener);

        //搜索初始化
        mkSerach = new MKSearch();
        mkSerach.init(app.mBMapManager, new MKSearchListener() {

            @Override
            public void onGetWalkingRouteResult(MKWalkingRouteResult arg0,
                    int arg1) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetTransitRouteResult(MKTransitRouteResult arg0,
                    int arg1) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetSuggestionResult(MKSuggestionResult arg0, int arg1) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetPoiResult(MKPoiResult arg0, int arg1, int arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetPoiDetailSearchResult(int arg0, int arg1) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetDrivingRouteResult(MKDrivingRouteResult arg0,
                    int arg1) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetBusDetailResult(MKBusLineResult arg0, int arg1) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onGetAddrResult(MKAddrInfo info, int arg1) {
                showAddr.setText(info.strAddr);
            }
        });

        //设置地图相关
        LocationClientOption option = new LocationClientOption();
        option.setOpenGps(true);
        option.setCoorType("bd09ll");
        option.setScanSpan(300000);
        mLocClient.setLocOption(option);
        mLocClient.start();
        mMapView.getController().setZoom(16);
        mMapView.getController().enableClick(true);
        mMapView.displayZoomControls(true);
        mMapListener = new MKMapViewListener() {

            public void onMapMoveFinish() {

            }

            public void onClickMapPoi(MapPoi mapPoiInfo) {
                // TODO Auto-generated method stub
                String title = "";
                if (mapPoiInfo != null) {
                    title = mapPoiInfo.strText;
                    Toast.makeText(MainActivity.this, title, Toast.LENGTH_SHORT)
                            .show();
                }
            }
        };
        mMapView.regMapViewListener(MyApplication.getInstance().mBMapManager,
                mMapListener);
        myLocationOverlay = new MyLocationOverlay(mMapView);
        locData = new LocationData();
        myLocationOverlay.setData(locData);
        mMapView.getOverlays().add(myLocationOverlay);
        myLocationOverlay.enableCompass();
        mMapView.refresh();
    }

    private void initMapView() {
        mMapView.setLongClickable(true);
    }

    /**
     * 监听函数，又新位置的时候，格式化成字符串，输出到屏幕中
     */
    public class MyLocationListenner implements BDLocationListener {
        public void onReceiveLocation(BDLocation location) {
            if (location == null)
                return;
            locData.latitude = location.getLatitude();
            locData.longitude = location.getLongitude();
            locData.direction = 2.0f;
            locData.accuracy = location.getRadius();
            locData.direction = location.getDerect();
            Log.d("loctest",
                    String.format("before: lat: %f lon: %f",
                            location.getLatitude(), location.getLongitude()));
            myLocationOverlay.setData(locData);
            mMapView.refresh();
            mMapController
                    .animateTo(new GeoPoint((int) (locData.latitude * 1e6),
                            (int) (locData.longitude * 1e6)), mHandler
                            .obtainMessage(1));
        }
        public void onReceivePoi(BDLocation poiLocation) {
            if (poiLocation == null) {
                return;
            }
        }
    }
    public class NotifyLister extends BDNotifyListener {
        public void onNotify(BDLocation mlocation, float distance) {
        }
    }

    @Override
    protected void onPause() {
        mMapView.onPause();
        super.onPause();
    }

    @Override
    protected void onResume() {
        mMapView.onResume();
        super.onResume();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mMapView.onSaveInstanceState(outState);

    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mMapView.onRestoreInstanceState(savedInstanceState);
    }
    public static void getPosition(GeoPoint g) {
        mkSerach.reverseGeocode(g);
        showAddr.setText("获取位置中...");
    }

}

Xml布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"

     >
    <TextView
        android:id="@+id/showAddr"
          android:gravity="center"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="选择地点"
        android:textSize="20dp"
        />
 <com.baidu.mapapi.map.MapView
        android:id="@+id/bmapsView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true" />
</LinearLayout>

三、绘制图形

MyIcon 的onDraw实现绘制中心点的图标，MyIcon2绘制指示器图标，如图所示

public class MyIcon extends View {
    public static int w;
    public static int h;
    public static  Bitmap mBitmap;

    public MyIcon(Context context) {
        super(context);
        mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.me);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        w = this.getWidth() / 2 - mBitmap.getWidth() / 2;
        h = this.getHeight() / 2 - mBitmap.getHeight() / 2;
        canvas.drawBitmap(mBitmap, w, h, null);
    }

}
public class MyIcon2 extends View{
    public static int w;
    public static int h;
    private Bitmap mBitmap;

    public MyIcon2(Context context) {
        super(context);
        mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.jiewo);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        w = this.getWidth() / 2 - mBitmap.getWidth() / 2;
        h = (this.getHeight() / 2 - mBitmap.getHeight() / 2) - (    MyIcon.mBitmap.getHeight()/2);
        canvas.drawBitmap(mBitmap, w, h, null);
    }
}

作者：杰瑞教育
出处：http://www.cnblogs.com/jerehedu/ 
版权声明：本文版权归烟台杰瑞教育科技有限公司和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。

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