百度地图自定义覆盖物

[size=large]使用百度地图有很长一段时间了，每次用的时候都是看官方例子，很少自己作总结，这样每次用的时候都会花时间去理解，今天就抽点时间总结一下：[/size]

1.废话不多说，先看效果：

[img]http://dl2.iteye.com/upload/attachment/0090/6073/599efe06-9efd-3834-9b3e-22bf3fa54620.png[/img]


2.基于百度地图版本：Android SDK v2.1.2
[size=medium][color=red]下方有官方Demo下载[/color][/size]

3.项目中加入所需权限，demo中权限很多，我从中筛选出我们这个覆盖物所需要的权限，如果不放心的话，也可以直接copy demo中的所有权限

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

4.继承Application，在子类中初始化一些百度地图引擎设置

public class MyApplication extends Application
{
	private static MyApplication baseApplication = null;

	public boolean m_bKeyRight = true;
	public BMapManager mBMapManager = null;
	//百度API_KEY
	public static String BMAP_API_KEY = "957503D42459F015B0BBF70C041B3D6D488A323F";

	@Override
	public void onCreate()
	{
		super.onCreate();

		baseApplication = this;

		initEngineManager(this);
	}

	public static MyApplication getInstance()
	{
		return baseApplication;
	}

	// 初始化百度地图引擎
	public void initEngineManager(Context context)
	{
		if (mBMapManager == null)
		{
			mBMapManager = new BMapManager(context);
		}

		if (!mBMapManager.init(BMAP_API_KEY, new MyGeneralListener()))
		{
			Toast.makeText(MyApplication.getInstance().getApplicationContext(),
					"BMapManager  初始化错误!", Toast.LENGTH_LONG).show();
		}
	}

	// 常用事件监听，用来处理通常的网络错误，授权验证错误等
	public static class MyGeneralListener implements MKGeneralListener
	{
		@Override
		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();
			}
			// ...
		}

		@Override
		public void onGetPermissionState(int iError)
		{
			if (iError == MKEvent.ERROR_PERMISSION_DENIED)
			{
				// 授权Key错误：
				Toast.makeText(
						MyApplication.getInstance().getApplicationContext(),
						"请在 DemoApplication.java文件输入正确的授权Key！",
						Toast.LENGTH_LONG).show();
				MyApplication.getInstance().m_bKeyRight = false;
			}
		}
	}
}

[color=red][size=large]不要忘记在manifiest里面引用MyApplication[/size][/color]

    <application
        android:name="com.example.baidumaptest.MyApplication"

5.接下来来看看Activity代码：

public class MainActivity extends Activity
{
	private MapView mapView = null;
	private MapController mMapController = null;
	private MyOverlay mOverlay = null;
	private PopupOverlay pop = null;

	// 经纬度，用来确定覆盖物的位置.这里就写死一个位置
	private double lat = 23.12916;
	private double lng = 113.379379;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		initClass();
		initBdMapViews();
	}

	// 初始化类
	private void initClass()
	{
		MyApplication app = (MyApplication) this.getApplication();
		if (app.mBMapManager == null)
		{
			app.mBMapManager = new BMapManager(this);
			app.mBMapManager.init(MyApplication.BMAP_API_KEY,
					new MyApplication.MyGeneralListener());
		}
	}

	// 初始化地图View
	private void initBdMapViews()
	{
		mapView = (MapView) findViewById(R.id.bmapView);
		// 设置相关参数
		mMapController = mapView.getController();
		mMapController.enableClick(true);
		mMapController.setZoom(17);
		mapView.setBuiltInZoomControls(true);

		// 初始化地图覆盖物
		initOverlay();
		// 调整地图中心点
		mMapController.setCenter(transformToGeoP(lat, lng));
	}

	//初始化覆盖物
	private void initOverlay()
	{
		mOverlay = new MyOverlay(getResources().getDrawable(
				R.drawable.icon_gcoding), mapView);
		//一个覆盖物
		OverlayItem item1 = new OverlayItem(transformToGeoP(lat, lng), "覆盖物", "");
		item1.setMarker(getResources().getDrawable(R.drawable.icon_gcoding));
		mOverlay.addItem(item1);
		mapView.getOverlays().add(mOverlay);
		mapView.refresh();
		//默认弹出
		showPopupOverlay(transformToGeoP(lat, lng));
	}

	// 自定义覆盖物
	public class MyOverlay extends ItemizedOverlay
	{
		public MyOverlay(Drawable arg0, MapView arg1)
		{
			super(arg0, arg1);
		}

		@Override
		protected boolean onTap(int arg0)
		{
			//弹出覆盖物
			showPopupOverlay(getItem(arg0).getPoint());
			return true;
		}

		@Override
		public boolean onTap(GeoPoint arg0, MapView arg1)
		{
			if (pop != null)
			{
				//隐藏覆盖物
				pop.hidePop();
			}
			return false;
		}
	}

	// 弹出覆盖物
	public void showPopupOverlay(GeoPoint p1)
	{
		pop = new PopupOverlay(mapView, null);
		View view = getLayoutInflater().inflate(R.layout.pop_layout, null);
		View pop_layout = view.findViewById(R.id.pop_layout);
		//将View转化成用于显示的bitmap
		Bitmap[] bitMaps = { BMapUtil.getBitmapFromView(pop_layout) };

		pop.showPopup(bitMaps, p1, 32);
	}

	// 将经纬度转换成GeoPoint
	private GeoPoint transformToGeoP(double lat, double lng)
	{
		return new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
	}

	//生命周期，必不可少，不全则影响百度性能，严重会报错
	@Override
	protected void onPause()
	{
		mapView.onPause();
		super.onPause();
	}

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

	@Override
	protected void onDestroy()
	{
		mapView.destroy();
		super.onDestroy();
	}

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

	@Override
	protected void onRestoreInstanceState(Bundle savedInstanceState)
	{
		super.onRestoreInstanceState(savedInstanceState);
		mapView.onRestoreInstanceState(savedInstanceState);
	}
}

[size=large]相比demo中代码，这代码相对简洁，把重要部分以最简单的方式展示出来，便于大家理解，有什么疑问或者代码有错误，欢迎指正[/size]

以上项目源码下载地址，欢迎大家下载指正：
[url]http://download.csdn.net/detail/qq15989177612/6462621[/url]