Android 百度地图 对鼠标点击、移动、抬起三个事件的监听

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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