mapabc 定位

最新推荐文章于 2013-12-19 08:51:59 发布

很水的长毛怪兽

最新推荐文章于 2013-12-19 08:51:59 发布

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分类专栏： android 文章标签： matrix null float android button string

本文链接：https://blog.youkuaiyun.com/bin381/article/details/7855815

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本文介绍了一个基于Android平台的地图应用程序开发实例，重点讲解了如何在Android设备上实现地图定位与旋转功能，并分享了一些实用技巧。

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先说说我的测试机器：nexus s，操作系统：android 4.1。以下的结果都是通过nexus s上测试通过。

还是直接上代码

package com.myMap;

import java.util.ArrayList;
import java.util.List;

import android.R.drawable;
import android.R.integer;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;


import com.location.IONSetLocation;
import com.location.MyMapABCLocationListener;
import com.location.MyMapABCLocationManager;
import com.mapabc.mapapi.core.GeoPoint;
import com.mapabc.mapapi.core.OverlayItem;
import com.mapabc.mapapi.map.ItemizedOverlay;
import com.mapabc.mapapi.map.MapActivity;
import com.mapabc.mapapi.map.MapController;
import com.mapabc.mapapi.map.MapView;
import com.mapabc.mapapi.map.Overlay;
import com.mapabc.mapapi.map.Projection;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;

public class MyMapActivity extends MapActivity implements OnClickListener{
    /** Called when the activity is first created. */
	private MapView mMapView;//地图VIEW
	private MapController mMapController;//控制器
	private List<Overlay> mOverlayList;	//地图图层容器
	private boolean mRegisteredSensor;
	private MyMapABCLocationListener mlLocationListener;
	private MyMapABCLocationManager mLocationManager;
	private MyOverlay mOverlay;   //我的位置图层
	private Handler mHandler;

	private boolean isFirstCenter=true;
	private GeoPoint geoPoint;
	private boolean isLocated=false;
	private Button btn;
	private Sensor orientSensor;
	private SensorManager mSensorManager;
	private SensorEventListener OrientSensorListener=new SensorEventListener(){		
		public void onAccuracyChanged(Sensor sensor,int accuracy){
			
		}
		public void onSensorChanged(SensorEvent event) {//从方向传感器获取手机所对的方向
			// TODO Auto-generated method stub
			if(event.sensor.getType()==Sensor.TYPE_ORIENTATION){
				float x=event.values[SensorManager.DATA_X];
				mOverlay.setDegree((int)x);
				mMapView.postInvalidate();//刷新mapview
			}
		}
 };
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mRegisteredSensor=false;
        mMapView = (MapView) findViewById(R.id.main_mapView);
        mMapView.setBuiltInZoomControls(true);  			// 设置启用内置的缩放控件
		mMapController = mMapView.getController();  		// 得到mMapView的控制权,可以用它控制和驱动平移和缩放
		mOverlayList = mMapView.getOverlays();				// 得到图层容器
		mMapController.setZoom(mMapView.getMaxZoomLevel()-1);//获取地图放大级别		
		btn=(Button)findViewById(R.id.search);
		btn.setOnClickListener(this);
		mOverlay=new MyOverlay(getResources().getDrawable(R.drawable.marker3));
		/////////////////////////////
		 mSensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
		 orientSensor=mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);		 
		////////////////////////////
		mOverlayList.add(mOverlay);
		initLogic();
    }
    @Override
    public void onClick(View v){
    	switch(v.getId()) {
    	case R.id.search:
    			if(geoPoint!=null){
    				mMapController.animateTo(geoPoint);
    			}
    		}
    	
    	
    }
      
    private void initLogic(){   	
    	mHandler=new Handler(){
    		@Override
    		public void handleMessage(Message msg){
    			switch (msg.what) {
				case 3:
					Toast.makeText(MyMapActivity.this, "location is null", Toast.LENGTH_SHORT).show();
					break;
				default:
					break;
				}
    		}
    	};
    	
    	mLocationManager=new MyMapABCLocationManager(this);
    	mlLocationListener=new MyMapABCLocationListener(mHandler, new UpdateLocationRunnable());
    	Location location=mLocationManager.getLastKnowLocation();
    	if(location!=null){
    		mOverlay.setLocation(location);
    		GeoPoint focusGeoPoint = new GeoPoint((int) (location.getLatitude() * 1E6),
					(int) (location.getLongitude() * 1E6));
		mMapController.animateTo(focusGeoPoint);
    		mMapView.postInvalidate();
    	}//////获取上次所在位置，如果不为null显示出来
    }
    public void firsCenter(Location location)
    {
    	if (location != null)
    	{
			GeoPoint focusGeoPoint = new GeoPoint((int) (location.getLatitude() * 1E6),
					(int) (location.getLongitude() * 1E6));
		
			mMapController.animateTo(focusGeoPoint);
    	}
    }
    @Override
    protected void onDestroy(){
    	super.onDestroy();
    	if(mOverlay!=null){
    		mOverlayList.clear();
    	}
    	mLocationManager.clear();
    }
    @Override//////////对于网络断开后重连，重要
    protected void onPause(){
    	super.onPause();
    	mLocationManager.unRegisterListen();
    	if(mRegisteredSensor){
			mSensorManager.unregisterListener(OrientSensorListener);
			mRegisteredSensor=false;
		}
    }
    @Override
    protected void onResume(){//////////对于网络断开后重连，重要
    	mLocationManager.registerListener(mlLocationListener);
    	Toast.makeText(this, "resume", Toast.LENGTH_SHORT).show();
    	mRegisteredSensor=mSensorManager.registerListener(OrientSensorListener, orientSensor,SensorManager.SENSOR_DELAY_GAME);
    	if(!mRegisteredSensor){
    		Toast.makeText(getApplicationContext(), "not support orientSensor", Toast.LENGTH_LONG).show();
    	}
    	super.onResume();
    }
    
    class UpdateLocationRunnable implements IONSetLocation{
    	private Location location;
    	private String address;
    	private boolean mVlid;
    	public UpdateLocationRunnable(){
    		
    	}
		@Override
		public void setAdress(String adress) {
			// TODO Auto-generated method stub
		}

		@Override
		public void setLocation(Location location) {
			// TODO Auto-generated method stub
			this.location=location;
		}		   
  		@Override
		public void run() {
			// TODO Auto-generated method stub
			
			if(location!=null){				
			}else{
				Toast.makeText(MyMapActivity.this, "Gaode -->no location...", Toast.LENGTH_SHORT).show();
			}
			mOverlay.setLocation(location);
			if(isFirstCenter){
				firsCenter(location);
			}
			geoPoint= new GeoPoint((int) (location.getLatitude() * 1E6),(int) (location.getLongitude() * 1E6));
			mMapView.postInvalidate();//刷新地图
			}		
		}

}/* * 我的位置图层 */class MyOverlay extends Overlay{private Location mLastLocation;private GeoPoint mLastGeoPoint;private Drawable drawable;private float degree;//图片旋转角度public MyOverlay(Drawable drawable){this.drawable=drawable;}public void setLocation(Location location){if (location != null){mLastLocation = location;mLastGeoPoint = new GeoPoint((int) (mLastLocation.getLatitude() * 1E6),(int) (mLastLocation.getLongitude() * 1E6));}}public void setDegree(float degree){this.degree=degree;}@Overridepublic void draw(Canvas canvas, MapView mapView, boolean shadow) {super.draw(canvas, mapView, shadow);// TODO Auto-generated method stub if (mLastLocation != null){ Projection projection = mapView.getProjection(); Point screenPts = new Point(); screenPts=projection.toPixels(mLastGeoPoint, null); Paint mPaint=new Paint(); mPaint.setColor(Color.BLUE); mPaint.setAlpha(5); float radius = projection.metersToEquatorPixels(mLastLocation.getAccuracy());canvas.drawCircle(screenPts.x, screenPts.y , radius, mPaint);//以精准度为半径画圆Bitmap bitmap=((BitmapDrawable)drawable).getBitmap();//画出“我的位置”图标Matrix matrix=new Matrix();matrix.setRotate(degree,0,0);bitmap=Bitmap.createBitmap(bitmap, 0, 0,bitmap.getWidth(), bitmap.getHeight(),matrix,false); canvas.drawBitmap(bitmap, screenPts.x-bitmap.getWidth()/2-0.5f,screenPts.y-bitmap.getHeight()/2-0.5f, new Paint());} }}

.MyMapABCLocationListener和MyMapABCLocationManager是参考别人代码封转的，由于篇幅的关系不给出来了（类详见代码：TestMapABCDemo.zip 很不错的参考代码）

我想说是旋转图片的问题。经过实践，如果一个图片经过旋转后，它的中心位置会发生改变。之前我的做法是获取原图的的中心位置，但是发现后面画出来的图片会“漂”

还有的是onResume和onDestory。注销了listener之后一定要把它注册回去，不然就不会监听消息了。

附件：myMap.rar

警告：android camera系列的文章是由一个刚接触android不到一个月的菜鸟所写，所以必然存在很多错误，请大家多多指出