| 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 activityList = new LinkedList (); @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：
| 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); }}
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