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Android定位&地图&导航——基于百度地图移动获取位置和自动定位，android定位城市
| 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