关键点：
1、MotionEvent.ACTION_DOWN, ACTION_MOVE, ACTION_UP, ACTION_CANCEL, ACTION_OUTSIDE,
ACTION_POINTER_DOWN, ACTION_POINTER_UP,
EDGE_TOP, EDGE_BOTTOM, EDGE_LEFT, EDGE_RIGHT
2、先获取屏幕坐标，再转换为经纬度坐标。
还未解决的问题有：
1、经纬度坐标精度问题，如何保留两位小数。Double.toString???
2、TextView如何添加到底图上去？？？？尝试过，会出错。
main.java
package com.example.baiduhl;
import java.math.BigDecimal;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.DragEvent;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.map.MKMapViewListener;
import com.baidu.mapapi.map.MapController;
import com.baidu.mapapi.map.MapPoi;
import com.baidu.mapapi.map.MapView;
import com.baidu.platform.comapi.basestruct.GeoPoint;
import com.baidu.platform.comapi.map.Projection;
public class Main extends Activity {
BMapManager mBMapMan = null;
MapView mMapView = null;
private Button button1;
private Button button2;
private TextView display;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBMapMan = new BMapManager(getApplication());
mBMapMan.init("13F11B305D58BA03616000731F6E9F87976CD7C4", null);
setContentView(R.layout.display);
mMapView = (MapView) findViewById(R.id.bmapsView);
mMapView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
// 获得屏幕点击的位置
int x = (int) event.getX();
int y = (int) event.getY();
// 将像素坐标转为地址坐标
Projection getProjection = mMapView.getProjection();
GeoPoint pt = getProjection.fromPixels(x, y);
//如何将经纬度坐标保留两位小数？？？？？
String longitude = Double.toString(pt.getLongitudeE6()/1000000 );
String latitude = Double.toString(pt.getLatitudeE6()/1000000 );
//double longitude = pt.getLongitudeE6()/1000000 ;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
display.setText("鼠标按下。当前屏幕坐标是： " + "x: " + x + " y: " + y
+ '\n' + "当前经纬度坐标是 " + "longitude: " + longitude
+ " latitude: " + latitude);
break;
case MotionEvent.ACTION_MOVE:
display.setText("拖动地图。当前屏幕坐标是： " + "x: " + x + " y: " + y
+ '\n' + "当前经纬度坐标是 " + "longitude: " + longitude
+ " latitude: " + latitude);
break;
case MotionEvent.ACTION_UP:
display.setText("鼠标抬起。最后屏幕坐标是： " + "x: " + x + " y: " + y
+ '\n' + "经纬度坐标是： " + "longitude: " + longitude
+ " latitude: " + latitude);
break;
}
/* display.setText("鼠标按下。当前屏幕坐标是： " + "x: " + x + " y: " + y
+ '\n' + "当前经纬度坐标是 " + "longitude: " + longitude
+ " latitude: " + latitude);
if (event.getAction() == event.ACTION_UP) {
display.setText("鼠标抬起。最后屏幕坐标是： " + "x: " + x + " y: " + y
+ '\n' + "经纬度坐标是： " + "longitude: " + longitude
+ " latitude: " + latitude);
}
*/
return false;
}
});
mMapView.setBuiltInZoomControls(true);
// 设置启用内部的缩放控件
MapController mMapController = mMapView.getController();
GeoPoint point = new GeoPoint((int) (39.915 * 1E6),
(int) (116.404 * 1E6));
// 用给定的经纬度构造一个GeoPoint，单位是微度 (度 * 1E6)
mMapController.setCenter(point);// 设置地图中心点
mMapController.setZoom(12);// 设置地图zoom级别
display = (TextView) findViewById(R.id.locationdisplay);
/*
* mMapView.setOnClickListener(new View.OnClickListener() {
*
* @Override public void onClick(View v) { // TODO Auto-generated method
* stub display.setText("刚刚点击了一下地图啦~~~~"); } });
*/
button1 = (Button) findViewById(R.id.buttontraffic);
button1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
if (mMapView.isTraffic() == true) {
mMapView.setTraffic(false);// 交通流量
Toast.makeText(Main.this, "traffic is off",
Toast.LENGTH_LONG).show();
display.setText("关闭交通流量啦啦~~~~");
} else {
mMapView.setTraffic(true);
Toast.makeText(Main.this, "traffic is on",
Toast.LENGTH_LONG).show();
display.setText("打开交通流量啦~~~~");
}
}
});
button2 = (Button) findViewById(R.id.buttonsatellite);
button2.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
if (mMapView.isSatellite() == true) {
mMapView.setSatellite(false);
Toast.makeText(Main.this, "satellite is off",
Toast.LENGTH_LONG).show();
display.setText("关闭卫星地图啦啦~~~~");
} else {
mMapView.setSatellite(true);
Toast.makeText(Main.this, "satellite is on",
Toast.LENGTH_LONG).show();
display.setText("打开卫星地图啦啦~~~~");
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.display, menu);
return true;
}
@Override
protected void onDestroy() {
mMapView.destroy();
if (mBMapMan != null) {
mBMapMan.destroy();
mBMapMan = null;
}
super.onDestroy();
}
@Override
protected void onPause() {
mMapView.onPause();
if (mBMapMan != null) {
mBMapMan.stop();
}
super.onPause();
}
@Override
protected void onResume() {
mMapView.onResume();
if (mBMapMan != null) {
mBMapMan.start();
}
super.onResume();
}
}
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