>标记携带对象的意图:FLAG_ACTIVITY_NEW_TASK FLAG_ACTIVITY_CLEAR_top FLAG_ACTIVITY_SINGLE_top
结果:broadacastReceiver端的空值
>使用初始意图标记创建的待定意图,使用:FLAG_UPDATE_CURRENT或FLAG_CANCEL_CURRENT
结果:broadacastReceiver端的空值
>使用System.currentTimeMillis()获取意图或待处理意图的随机ID;
结果:根本不会触发或接收意图
>上面没有描述.结果:每次检索相同的初始值.
调用方法的代码(从任何试验中剥离/产生空值):
private voID setProximityAlert(MyCar myCar) { String locService = Context.LOCATION_SERVICE; LocationManager locationManager; locationManager = (LocationManager)getSystemService(locService); float radius = myCar.getMyCarRadius(); long expiration = myCar.getMyCarExpiration(); myService.setMyDriverLat(userLat);//setting user's position myService.setMyDriverLng(userLng);//setting user's position Intent intent = new Intent(myCar.getMyCarname()); intent.putExtra("myCar",myCar); PendingIntent proximityIntent = PendingIntent.getbroadcast(this,-1,intent,0); locationManager.addProximityAlert(myCar.getMyCarLat(),myCar.getMyCarLng(),radius,expiration,proximityIntent); }
设置intent过滤器并注册broadcastReceiver的调用方法的代码:
public voID addNewCarPoint (MyCar myCar){ IntentFilter filter = new IntentFilter(myCar.getMyCarname()); registerReceiver(new ProximityAlertReceiver(),filter); setProximityAlert(myCar); }
broadcastReceiver方面的代码:
public class ProximityAlertReceiver extends broadcastReceiver { @OverrIDe public voID onReceive (Context context,Intent intent) { MyCar myCar=(MyCar)intent.getParcelableExtra("myCar"); driverLoc=(String)Double.toString(myCar.getMyDriverLat()); Toast.makeText(context,userLoc,Toast.LENGTH_SHORT).show(); Intent i = new Intent(context,MyCardiscoveryPrompt.class); context.startActivity(i);//firing intent } public voID intentDataLoader(){ }
}
任何想法都会受到欢迎.
先感谢您.
我放置了broadcastReceiver(ProximityAlerReceiver),用于检测LocationListener.class所在的同一类(MyCarTracking.class)中的邻近警报.这个,
提供对新的位置更新的即时访问,创建包含在要向broadcastReceiver触发的新pendingIntent中的新意图(仅当满足接近标准时).
flags:FLAG_ACTIVITY_NEW_TASK FLAG_ACTIVITY_SINGLE_top和FLAG_CANCEL_CURRENT分别保存在intent和pendingIntent上.进一步来说:
LocationListener的代码:
private final LocationListener locationListener = new LocationListener() { public voID onLocationChanged(Location location) { updateWithNewLocation(location);//update application based on new location } public voID onProvIDerDisabled(String provIDer){ updateWithNewLocation(null);//update application if provIDer Disabled } public voID onProvIDerEnabled(String provIDer){ // Update application if provIDer enabled } public voID onStatusChanged(String provIDer,int status,Bundle extras){ //update application if provIDer harDWare status changed } };
setProximityAlert()方法的代码:
private voID setProximityAlert() { String locService = Context.LOCATION_SERVICE; Context context =getApplicationContext(); LocationManager locationManager; locationManager = (LocationManager)getSystemService(locService); float radius = myCar.getMyCarRadius(); long expiration = myCar.getMyCarExpiration(); Intent intent = new Intent(CAR_disCOVERED); intent.putExtra("myCar",myCar); locationManager.getLastKNownLocation(provIDer); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK).addFlags(Intent.FLAG_ACTIVITY_SINGLE_top);//flagging intent PendingIntent proximityIntent = PendingIntent.getbroadcast(context,PendingIntent.FLAG_CANCEL_CURRENT);//flagging pendingIntent locationManager.addProximityAlert(myCar.getMyCarLat(),proximityIntent);//setting proximity alert}
该解决方案通过新的位置更新产生新的意图.谢谢大家的帮助和兴趣:)
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