android 应用类APP开发小结——android Google map 小应用

首届Google暑期大学生博客分享大赛——2010 Andriod篇

做了一个小应用智能情景的切换,这个应用是学习android开发以来应用类开发的比较满意的一个。虽然它只有一个view 一个activity,但是却囊括了android的很多特性。借此机会,和大家分享一下这个小应用。

 

先上截图:

android 应用类APP开发小结——android Google map 小应用

 

应用的主要功能是根据适当的情景(如地点,手机状态等)为用户自动的切换情景模式。

比方说:手机向上是铃音+震动,当开会时,将手机翻转,将自动切换成静音模式。

还可以根据经纬度,到达一个地方后自动切换成用户预先设置的情景模式。

(当然,由于没找到合适的经纬度换算工具,经纬度的判断目前只能是精确位置,不是范围值。

因此只能算是个学习的小应用了,实际的应用还有待完善啊。如果有高手知道的话,麻烦告诉我下。万分感谢)

 

-------------------------废话不多说开始代码部分-----------------------------------------------------

虽然是一个只有一个页面的小应用,但是

麻雀虽小,五脏俱全

这个应用的功能点主要有:

     改变情景模式

     实时获取地理位置

     实时判断手机重力状态

用到的技术包括:

1.android Google map的应用

2.Android组件的使用
    Activity(MapActivity)
    Service
    Broadcastreceiver

3.Xml解析
4.文件存储
5.传感器使用
6.底层绘图
7.自定义view

 

由于使回头看代码,我就从简单的部分一步步介绍。

 

首先是权限问题,很多新手都犯了这个毛病,程序出错,往往是权限没有添加。

 <!-- 网络链接 -->
    <uses-permission android:name="android.permission.INTERNET"/>
    <!-- 地图 -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <!-- 读写权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE" />

 这个应用需要网络连接的权限,因为Google map是实时更新的么。然后是GPS传感器关于地理位置的权限。最后需要存储用户的记录点,所以有文件读写的权限。

 

为了记录用户记录的情景地点,我使用了XML作为存储的标准,并将文件存在了SD卡上

XML解析

网络上有很详细的各种解析方式,我采用了其中的一种。如果想了解其他的请Google。。。。。

记录地点信息,我定义了一个POJO类

public class RecordLocation {
    private String location_Id;
    private String location_ring;
    private double location_latitude;
    private double location_longitude;
    private GeoPoint	point;
...篇幅关系,其他的略

 XML的解析器,和网络上的其他文章一样就不多说了。能拿来用就成。

public List<RecordLocation> parse(String xml) {
        final RecordLocation currentMessage = new RecordLocation();
        RootElement root = new RootElement("Locations");
        final List<RecordLocation> messages = new ArrayList<RecordLocation>();
       // Element channel = root.getChild("RespInfo");
        Element item = root.getChild("Location");
        item.setEndElementListener(new EndElementListener(){
            public void end() {
                messages.add(currentMessage.copy());
            }
        });
        item.getChild("id").setEndTextElementListener(new EndTextElementListener(){
            public void end(String body) {
                currentMessage.setLocation_Id(body);
            }
        });
        item.getChild("ring").setEndTextElementListener(new EndTextElementListener(){
            public void end(String body) {
                currentMessage.setLocation_ring(body);
            }
        });
        item.getChild("latitude").setEndTextElementListener(new
          EndTextElementListener(){
            public void end(String body) {
                currentMessage.setLocation_latitude(Double.valueOf(body));
            }
        });
        item.getChild("longitude").setEndTextElementListener(new EndTextElementListener(){
            public void end(String body) {
                currentMessage.setLocation_longitude(Double.valueOf(body));
            }
        });

        try {
        	InputStream   inputStream   =   new   ByteArrayInputStream(xml.getBytes());
            Xml.parse(inputStream, Xml.Encoding.UTF_8,
            root.getContentHandler());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return messages;
    }

 POJO类转化成XML字符串

public static String writeXml(List<RecordLocation> data){
		XmlSerializer serializer = Xml.newSerializer();
		StringWriter writer = new StringWriter();
		try{
			serializer.setOutput(writer);
			// <?xml version=”1.0″ encoding=”UTF-8″ standalone=”yes”?>
			serializer.startDocument("UTF-8",true);
			serializer.startTag("","Locations");
			
			for(int i=0;i<data.size();i++){
				serializer.startTag("","Location");
				
				serializer.startTag("","id");
				serializer.text(data.get(i).getLocation_Id());
				serializer.endTag("","id");
				
				serializer.startTag("","ring");
				serializer.text(data.get(i).getLocation_ring());
				serializer.endTag("","ring");
				
				serializer.startTag("","latitude");
				serializer.text(String.valueOf(data.get(i).getLocation_latitude()));
				serializer.endTag("","latitude");
				
				serializer.startTag("","longitude");
				serializer.text(String.valueOf(data.get(i).getLocation_longitude()));
				serializer.endTag("","longitude");
				
				serializer.endTag("","Location");
				
			}
													
					
			serializer.endTag("","Locations");
			serializer.endDocument();
		    return writer.toString();
		}
		catch(Exception e)
		{
			throw new RuntimeException(e);
		}
	}

 有了XML的字符串后只要将它存储起来就行,需要使用是再读取

以下是存储和读取文件函数。由于SD卡的读取还需要判断SD卡的状态,函数比较长,就贴存手机内存的代码

反正大同小异

public static InputStream readInternalFileInputStream(Context context,String fileName){
		/**
		 * 读取手机内存文件
		 * */
		
		try{
			FileInputStream fis = context.openFileInput(fileName);
			
			return fis;
		}catch(Exception e){
			return null;
		}
		
	}
	public static String readInternalFile(Context context,String fileName){
		/**
		 * 读取手机内存文件
		 * */
		
		try{
			byte[] buffer = new byte[512];
			int read =0;
			StringBuffer stringbuffer = new StringBuffer();
			FileInputStream fis = context.openFileInput(fileName);
			do{
				read = fis.read(buffer);
				if(read>0)
				   stringbuffer.append(new String(buffer, 0, read, "utf-8"));
				
			}while(read!=-1);
			fis.close();
			return stringbuffer.toString();
		}catch(Exception e){
			return null;
		}
		
	}
 


数据存储部分完毕了。接下来是关于切换手机情景的功能

 

手机的铃音设置

AudioManager audio = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);

// 铃声和震动
	protected void ringAndVibrate(AudioManager audio){
		audio.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, AudioManager.VIBRATE_SETTING_ON);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION, AudioManager.VIBRATE_SETTING_ON);
	}
	// 铃声
	protected void ring(AudioManager audio){
		audio.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, AudioManager.VIBRATE_SETTING_OFF);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION, AudioManager.VIBRATE_SETTING_OFF);
	}
	// 震动
	protected void vibrate(AudioManager audio){
		audio.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, AudioManager.VIBRATE_SETTING_ON);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION, AudioManager.VIBRATE_SETTING_ON);
	}
	// 静音
	protected void silent(AudioManager audio){
		audio.setRingerMode(AudioManager.RINGER_MODE_SILENT);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_RINGER, AudioManager.VIBRATE_SETTING_OFF);
		audio.setVibrateSetting(AudioManager.VIBRATE_TYPE_NOTIFICATION, AudioManager.VIBRATE_SETTING_OFF);
	}
	// 改变声音-----减小
	protected void lowerVoice(AudioManager audio, int voice){
		audio.setRingerMode(AudioManager.ADJUST_LOWER);
		audio.adjustVolume(AudioManager.ADJUST_LOWER, voice);
	}
	// 改变声音-----增加
	protected void addVoice(AudioManager audio, int voice){
		audio.setRingerMode(AudioManager.ADJUST_RAISE);
		audio.adjustVolume(AudioManager.ADJUST_RAISE, voice);
	}
 

这里我使用了BroadcastReceiver(广播接收器)。当需要更改情景模式时,发送一个intent出来,BroadcastReceiver接收到这个intent后根据intent内携带的值判断切换成那种情景模式

 

BroadcastReceiver的使用需要在androidmanifest文件中申明

<receiver android:name=".RingBroadcastReceiver">
			<intent-filter>
				<action android:name="cn.zucc.yoyo.ringmaster.RING_RECEIVER" />
			</intent-filter>
		</receiver>

 当触发一定情景时只要发送一个Intent。广播接收器就可以接受到,然后执行相应代码

Intent intent = new Intent("cn.zucc.yoyo.ringmaster.RING_RECEIVER");
			  Bundle bundle = new Bundle();
			  bundle.putDouble("latitude", currentGeoPoint.getLatitudeE6());
			  bundle.putDouble("longitude", currentGeoPoint.getLongitudeE6());
			  intent.putExtra("location", bundle);
				// 发送广播
			  sendBroadcast(intent);

 

接下来是实时获取用户当前的位置

 

我们的activity是时常被用户打断的。即被置到后台,用户处理其他事情去了。所以实时更新位置信息就需要使用service组件。该组件将一直运行在后台,除非你停止它。

 

service的使用也需要在androidmanifest文件中定义

<service android:name=".RingService" android:process=":remote">
            <intent-filter>
                <action android:name="cn.zucc.yoyo.ringmaster.RING_SERVICE" />
            </intent-filter>
        </service>
 

 

对于service我们只需要知道它的5个生命周期,然后在相应的周期中干我们需要的事情即可。

而启动一个service,和停止service也很简单

 

startService(new Intent(
                "cn.zucc.yoyo.ringmaster.RING_SERVICE2"));

startService(new Intent(
            	"cn.zucc.yoyo.ringmaster.RING_SERVICE2"));

stopService(new Intent(
            	"cn.zucc.yoyo.ringmaster.RING_SERVICE2"));

 

补充一点,关于手机重力感应,因为也是需要实时判断,所以我也将它添加在service中。

private SensorManager sensorMgr ;
	private SensorEventListener lsn ;
sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE); 
		   Sensor sensor = sensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
	       lsn = new SensorEventListener() { 

	           public void onSensorChanged(SensorEvent e) {  
	             //x = e.values[SensorManager.DATA_X];       
	           //  y = e.values[SensorManager.DATA_Y];       
	             z = (int) e.values[SensorManager.DATA_Z];    
	             if(z>5&&(audio.getRingerMode()!=AudioManager.RINGER_MODE_NORMAL)){
	            	 Intent intent = new Intent("android.provider.Telephony.SMS_RECEIVER");
	     			intent.putExtra("ringmode", 4);
	     			// 发送广播
	     			sendBroadcast(intent);
	             }else if(z<-5&&(audio.getRingerMode()!=AudioManager.RINGER_MODE_SILENT)){
	            	 Intent intent = new Intent("android.provider.Telephony.SMS_RECEIVER");
	     			intent.putExtra("ringmode", 3);
	     			// 发送广播
	     			sendBroadcast(intent);
	             }
	            	 
	            // setTitle("x="+(int)x+","+"y="+(int)y+","+"z="+(int)z);    
	          }    
	              
	           public void onAccuracyChanged(Sensor s, int accuracy) {    
	           }    
	       };    

 当手机状态变化时就发送相应的intent广播。。广播接收器接收到后根据intent携带的值,改变情景模式。

 

而用户当前位置的更新问题也和上面的重力感应更新差不多

private LocationManager mLocationManager;
mLocationManager =	(LocationManager)getSystemService(Context.LOCATION_SERVICE);
		updateMyLocation(mLocationManager);

/**更新我的位置
	 * 
	 * */
	String strLocationProvider="test";
	  public void updateMyLocation(LocationManager lm){

	      /* 第一次运行向Location Provider取得Location */
	      Location mLocation01 = getLocationProvider(lm);

	      if(mLocation01!=null)
	      {
	        processLocationUpdated(mLocation01);
	      }
	      else
	      {
	    	  Toast.makeText(this,"位置初始化出错", Toast.LENGTH_SHORT).show();
	      }
	      /* 创建LocationManager对象,监听Location更改时事件,更新MapView */
	      lm.requestLocationUpdates
	      (strLocationProvider, 2000, 10, mLocationListener01);
	  }
	  
	  public Location getLocationProvider(LocationManager lm)
	  {//设定:地理位置获取的参数信息
	    Location retLocation = null;
	    try
	    {
	      Criteria mCriteria01 = new Criteria();
	      mCriteria01.setAccuracy(Criteria.ACCURACY_FINE);
	      mCriteria01.setAltitudeRequired(false);
	      mCriteria01.setBearingRequired(false);
	      mCriteria01.setCostAllowed(true);
	      mCriteria01.setPowerRequirement(Criteria.POWER_LOW);
	      strLocationProvider = lm.getBestProvider(mCriteria01, true);
	      retLocation = lm.getLastKnownLocation(strLocationProvider);
	    }
	    catch(Exception e)
	    {
	     // mTextView01.setText(e.toString());
	      e.printStackTrace();
	    }
	    return retLocation;
	  }
	  
	  /**位置监听器*/
	  public final LocationListener
	  mLocationListener01 = new LocationListener()
	  {
		  public void onLocationChanged(Location location)
		  {
			  // TODO Auto-generated method stub
			  /* 当手机收到位置更改时,将location传入取得地理坐标 */
			  processLocationUpdated(location);
		  }

		  public void onProviderDisabled(String provider)
		  {
			  // TODO Auto-generated method stub
			  /* 当Provider已离开服务范围时 */
			  Toast.makeText(RingService.this, "无地理位置信息可用", Toast.LENGTH_SHORT).show();
		  }

		  public void onProviderEnabled(String provider)
		  {
			  // TODO Auto-generated method stub
		  }

		  public void onStatusChanged
		  (String provider, int status, Bundle extras)
		  {
			  // TODO Auto-generated method stub
		  }
	  };
	  
	  /* 当手机收到位置更改,将location传入GeoPoint及MapView */
	  private void processLocationUpdated(Location location)
	  {
		  /* 传入Location对象,取得GeoPoint地理坐标 */
		  GeoPoint currentGeoPoint = getGeoByLocation(location);
		  /**
		   * */
		  Log.i("service--------",currentGeoPoint.getLatitudeE6()+":"+currentGeoPoint.getLongitudeE6());
		  //读取记录的位置信息
			  Intent intent = new Intent("android.provider.Telephony.SMS_RECEIVER2");
			  Bundle bundle = new Bundle();
			  bundle.putDouble("latitude", currentGeoPoint.getLatitudeE6());
			  bundle.putDouble("longitude", currentGeoPoint.getLongitudeE6());
			  intent.putExtra("location", bundle);
				// 发送广播
			  sendBroadcast(intent);
			  Log.i("service--------", "been send");
			  
			  
			  Intent intent2 = new Intent("cn.yoyo.locationupdate");
			  Bundle bundle2 = new Bundle();
			  bundle2.putDouble("latitude", currentGeoPoint.getLatitudeE6());
			  bundle2.putDouble("longitude", currentGeoPoint.getLongitudeE6());
			  intent2.putExtra("location", bundle2);
			  // 发送广播
			  sendBroadcast(intent2);
			  Log.i("service--------", "been send");
			 // Toast.makeText(this, "情景已切换", Toast.LENGTH_SHORT).show();

	  }
	  /**location->geopoint*/
	  public static GeoPoint getGeoByLocation(Location location)
	  {
		  GeoPoint gp = null;
		  try
		  {
			  /* 当Location存在 */
			  if (location != null)
			  {
				  double geoLatitude = location.getLatitude()*1E6;
				  double geoLongitude = location.getLongitude()*1E6;
				  gp = new GeoPoint((int) geoLatitude, (int) geoLongitude);
			  }
		  }
		  catch(Exception e)
		  {
			  e.printStackTrace();
		  }
		  return gp;
	  }
 

最后就是使用android Google map .使用关于如何使用Google map网上也有很详细的介绍,有时间我将专门详细的写一篇关于Google map的。

 

这里重点介绍下如何在Mapview上添加自定义标记的问题,当我在查找相关资料时,由于他们用的就是旧版的SDK,所以代码没有运行起来。

要向Mapview添加标记只要如下代码即可。

MapLocationOverlay overlay = new MapLocationOverlay(this);
		mapView.getOverlays().add(overlay);

 这里我继承Overlay,实现了自己的一个标记MapLocationOverlay

public class MapLocationOverlay  extends Overlay {

	
    private Bitmap bubbleIcon, shadowIcon;
    private Bitmap bubbleVolume,bubbleVolumeOff,bubbleVibrate,bubbleVolumeeVibrate;

    private MapLocationViewer mapLocationViewer;

	private Paint	innerPaint, borderPaint, textPaint;

  
    private RecordLocation selectedMapLocation;

    private Handler mHandler;

    public void setinfowindow(Handler handler){
    	this.mHandler = handler;
    }
	public MapLocationOverlay(MapLocationViewer		mapLocationViewer) {

		this.mapLocationViewer = mapLocationViewer;

		bubbleIcon = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.bubble);
		bubbleVolume = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.bubble_volume);
		bubbleVolumeOff = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.bubble_volumeoff);
		bubbleVibrate = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.bubble_vibrate);
		bubbleVolumeeVibrate = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.bubble_volumevibrate);
		shadowIcon = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.shadow);
	}

	@Override
	public boolean onTap(GeoPoint p, MapView	mapView)  {

		//  Store whether prior popup was displayed so we can call invalidate() & remove it if necessary.
		boolean isRemovePriorPopup = selectedMapLocation != null;

		//  Next test whether a new popup should be displayed
		selectedMapLocation = getHitMapLocation(mapView,p);
		if ( isRemovePriorPopup || selectedMapLocation != null) {
			if(selectedMapLocation==null){
				//发送消息
				Message msg = mHandler.obtainMessage();
				msg.what = RingMaster.REFERSH_LOCATION;
				Bundle b = new Bundle();
				b.putInt("view",android.view.View.GONE);
				msg.setData(b);
				mHandler.sendMessage(msg);
			}else{
				//发送消息
				Message msg = mHandler.obtainMessage();
				msg.what = RingMaster.REFERSH_LOCATION;
				Bundle b = new Bundle();
				b.putString("location", selectedMapLocation.getLocation_Id());
				//b.putString("ringmode", selectedMapLocation.getLocation_ring());
				b.putDouble("latitude", selectedMapLocation.getLocation_latitude());
				b.putDouble("longitude", selectedMapLocation.getLocation_longitude());
				b.putInt("view", android.view.View.VISIBLE);
				msg.setData(b);
				mHandler.sendMessage(msg);
				
				mapView.getController().animateTo(p);
				mapView.invalidate();
				
			}
		}

		//  Lastly return true if we handled this onTap()
		return selectedMapLocation != null;
	}

    @Override
	public void draw(Canvas canvas, MapView	mapView, boolean shadow) {

   		drawMapLocations(canvas, mapView, shadow);
   		//drawInfoWindow(canvas, mapView, shadow);
    }

    private RecordLocation getHitMapLocation(MapView	mapView, GeoPoint	tapPoint) {

    	//  Track which MapLocation was hit...if any
    	RecordLocation hitMapLocation = null;

    	RectF hitTestRecr = new RectF();
		Point screenCoords = new Point();
    	Iterator<RecordLocation> iterator = mapLocationViewer.getMapLocations().iterator();
    	while(iterator.hasNext()) {
    		RecordLocation testLocation = iterator.next();

    		//  Translate the MapLocation's lat/long coordinates to screen coordinates
    		mapView.getProjection().toPixels(testLocation.getPoint(), screenCoords);

	    	// Create a 'hit' testing Rectangle w/size and coordinates of our icon
	    	// Set the 'hit' testing Rectangle with the size and coordinates of our on screen icon
    		hitTestRecr.set(-bubbleIcon.getWidth()*2,-bubbleIcon.getHeight()*2,bubbleIcon.getWidth()*2,0);
    		hitTestRecr.offset(screenCoords.x,screenCoords.y);

	    	//  Finally test for a match between our 'hit' Rectangle and the location clicked by the user
    		mapView.getProjection().toPixels(tapPoint, screenCoords);
    		if (hitTestRecr.contains(screenCoords.x,screenCoords.y)) {
    			hitMapLocation = testLocation;
    			break;
    		}
    	}

    	//  Lastly clear the newMouseSelection as it has now been processed
    	tapPoint = null;

    	return hitMapLocation;
    }

    private static final int VOLUME=1,VIBRATE=2,VOLUMEOFF=3,VOLUMEVIBRATE=4;
    private void drawMapLocations(Canvas canvas, MapView	mapView, boolean shadow) {

    	if(mapLocationViewer.getMapLocations()!=null){
    		
    		Iterator<RecordLocation> iterator = mapLocationViewer.getMapLocations().iterator();
    		Point screenCoords = new Point();
    		while(iterator.hasNext()) {
    			RecordLocation location = iterator.next();
    			mapView.getProjection().toPixels(location.getPoint(), screenCoords);
    			
    			if (shadow) {
    				//  Only offset the shadow in the y-axis as the shadow is angled so the base is at x=0;
    				canvas.drawBitmap(shadowIcon, screenCoords.x, screenCoords.y - shadowIcon.getHeight(),null);
    			} else {
    				switch(Integer.valueOf(location.getLocation_ring())){
    				case VOLUME:
    					canvas.drawBitmap(bubbleVolume, screenCoords.x - bubbleVolume.getWidth()/2, screenCoords.y - bubbleVolume.getHeight(),null);
    					break;
    				case VIBRATE:
    					canvas.drawBitmap(bubbleVibrate, screenCoords.x - bubbleVibrate.getWidth()/2, screenCoords.y - bubbleVibrate.getHeight(),null);
    					break;
    				case VOLUMEOFF:
    					canvas.drawBitmap(bubbleVolumeOff, screenCoords.x - bubbleVolumeOff.getWidth()/2, screenCoords.y - bubbleVolumeOff.getHeight(),null);
    					break;
    				case VOLUMEVIBRATE:
    					canvas.drawBitmap(bubbleVolumeeVibrate, screenCoords.x - bubbleVolumeeVibrate.getWidth()/2, screenCoords.y - bubbleVolumeeVibrate.getHeight(),null);
    					break;
    				default:
    					canvas.drawBitmap(bubbleIcon, screenCoords.x - bubbleIcon.getWidth()/2, screenCoords.y - bubbleIcon.getHeight(),null);
    					break;
    				}
    			}
    		}
    	}
    }

  
	public Paint getInnerPaint() {
		if ( innerPaint == null) {
			innerPaint = new Paint();
			innerPaint.setARGB(225, 75, 75, 75); //gray
			innerPaint.setAntiAlias(true);
		}
		return innerPaint;
	}

	public Paint getBorderPaint() {
		if ( borderPaint == null) {
			borderPaint = new Paint();
			borderPaint.setARGB(255, 255, 255, 255);
			borderPaint.setAntiAlias(true);
			borderPaint.setStyle(Style.STROKE);
			borderPaint.setStrokeWidth(2);
		}
		return borderPaint;
	}

	public Paint getTextPaint() {
		if ( textPaint == null) {
			textPaint = new Paint();
			textPaint.setARGB(255, 255, 255, 255);
			textPaint.setAntiAlias(true);
		}
		return textPaint;
	}

  注:这里可能有些函数是无用的,因为这个类还实现在Mapview上出现infowindow的效果。不过这里为了简化起见我就删了。

 

 

最后总结一下:其实开发一个应用,我都是先从view开始,然后更具应用需要的,进行单个功能的开发,最后就是ctrl+c和V了呵呵。

但这里正好是反过来了。想从易道难成列。。。哈哈毕竟是新手,第一次写这种文章,大家见谅吧。

 

这个应用只有一个activity,既只有一个view。在这个view中有Mapview。

而使用Google map 基本上就是让这个activity继承MapActivity,然后对这个Mapview对象进行操作了。

这个应用通过两个service分别运行在后台,其一实时更新用户的位置,其二实时跟新手机的重力状态。进而发送相应的intent广播,而这个intent广播携带了情景模式的信息,当boardcastreceiver(广播接收器)接受到这个广播后就调用相应函数并根据intent携带的信息改变手机的情景。而用户每次记录的地点和情景,则使用了XML文件进行读写。

在mapview上的自定义标记采用了重写ondraw方法的方式,在底层自己绘制。