[置顶] Android高德地图显示气泡框

        现在的聊天框大多都是气泡框，气泡框长相可爱，有良好的用户体验。

        如何把气泡框应用于地图上呢？

        步骤一：首先要定义我们的气泡框布局，也就是所谓的layout。

popup.xml:

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout android:orientation="horizontal" android:id="@+id/LinearLayoutPopup"
    android:background="@drawable/tip_pointer_button"
	android:focusable="true" android:clickable="true" android:layout_width="wrap_content"
	android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android">
	
     <LinearLayout android:layout_gravity="center_vertical"
		android:orientation="vertical" android:id="@+id/LinearLayoutPoi"
		android:paddingLeft="5.0dip" android:paddingRight="5.0dip"
		android:layout_width="wrap_content" android:layout_height="wrap_content">
		<TextView android:textSize="16.0sp" android:textColor="#ff000000"
			android:id="@+id/location" android:layout_width="wrap_content"
			android:layout_height="wrap_content" 
			android:singleLine="true" />
	</LinearLayout>

</LinearLayout>

其外观如图：

    

    步骤二：接着就是自定义我们的Overlay，取名为MapPointOverlay:

/**
 * 地图点图层
 */
public class MapPointOverlay extends Overlay {

	private LayoutInflater inflater; // 布局填充器
	private View popUpView; // 气泡框

	public MapPointOverlay(Context context) {
		inflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE); // 初始化布局填充器
		popUpView = inflater.inflate(R.layout.popup, null); // 初始化气泡框
	}

	@Override
	public void draw(Canvas canvas, MapView mapView, boolean shadow) {
		super.draw(canvas, mapView, shadow);
	}

	@Override
	public boolean onTap(final GeoPoint point, final MapView view) {
		if (popUpView != null) {
			view.removeView(popUpView);
		}
		TextView textView = (TextView) popUpView.findViewById(R.id.location);
		String location = "纬度:" + point.getLatitudeE6() / 1.0E6 + ",经度:"
				+ point.getLongitudeE6() / 1.0E6;
		textView.setText(location);
		MapView.LayoutParams lp;
		lp = new MapView.LayoutParams(MapView.LayoutParams.WRAP_CONTENT,
				MapView.LayoutParams.WRAP_CONTENT, point, 0, 0,
				MapView.LayoutParams.BOTTOM_CENTER);
		view.addView(popUpView, lp);
		return super.onTap(point, view);
	}
	
}

   步骤三： 最后是编写MapActivity:

public class MainActivity extends MapActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		MapView mapView = (MapView) findViewById(R.id.main_mapView);	// 获取mapView实例
		MapPointOverlay overlay = new MapPointOverlay(this);			// 新建Overlay实例
		mapView.getOverlays().add(overlay);								// 将Overlay添加到MapView图层上
	}
}

    另外别忘了相应的权限：

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    

    地图上显示气泡框的效果：

    完整的Android项目包：http://download.csdn.net/detail/czjuttsw/5217774