我有一个经纬度长且ID较长的数据库，并已使用json检索了此数据库，并想将接近警报应用于数组中的地理位置。
我不确定是否正确传递了数组或是否正确调用了接近警报.java
这是数据库检索
public class retrieveDB extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... params) {
String result = "";
InputStream is = null;
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://cs1.ucc.ie/~am32/getDB.php");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}
catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
is.close();
result=sb.toString();
Log.i("json string", result);
}
catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
//parse json data
try{
JSONArray jArray = new JSONArray(result);
JSONObject json_data = null;
System.out.println("Length"+ jArray.length());
Log.d("DB","Length"+jArray.length());
for(int i=0; i<jArray.length(); i++){
json_data = jArray.getJSONObject(i);
int id = json_data.getInt("ID") ;
//String title = json_data.getString("Title");
double latitude = json_data.getDouble("Lat");
double longitude = json_data.getDouble("Lon");
//Adds proximity to POI's
ProxAlert inst = new ProxAlert();
inst.addProximityAlert(latitude,longitude, id);
//
inst.saveCoordinatesInPreferences((float)latitude, (float)longitude);
//prints to logCat
System.out.println(id+"&"+latitude+"&"+longitude);
}
}
catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
Log.e("log_tag","Failed data as:\n"+result);
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
// invoked on UI thread publishProgress(Progress...).
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(Void result) {
// result of background comp is passed to this step its invoked on the ui thread
super.onPostExecute(result);
}
}
和我的接近警报类
public class ProxAlert extends Activity {
private static final long POINT_RADIUS = 10;
private static final long PROX_ALERT_EXPIRATION = -1;
private static final String POINT_LATITUDE_KEY = "POINT_LATITUDE_KEY";
private static final String POINT_LONGITUDE_KEY = "POINT_LONGITUDE_KEY";
private LocationManager locationManager;
private static final String PROX_ALERT_INTENT= "com.example.try0.ProximityIntentReceiver";
void addProximityAlert (double latitude, double longitude, int id){
Bundle extras = new Bundle();
extras.putInt("title", id);
extras.putDouble("lat", latitude);
extras.putDouble("lon", longitude);
Intent intent = new Intent(PROX_ALERT_INTENT + id);
//intent.putExtra("alert", "it works");
intent.putExtra(PROX_ALERT_INTENT, extras);
PendingIntent proximityIntent = PendingIntent.getBroadcast(this, id, intent, PendingIntent.FLAG_CANCEL_CURRENT);
//ProximityIntent will be used to generate an Intent to fire when entry to or exit from the alert region is detected
locationManager.addProximityAlert(latitude,longitude,POINT_RADIUS,PROX_ALERT_EXPIRATION,proximityIntent);
IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT + id);
registerReceiver(new ProximityIntentReciever(), filter);
}
void saveCoordinatesInPreferences(float currentlatitude, float currentlongitude){
SharedPreferences prefs = this.getSharedPreferences(getClass().getSimpleName(), Context.MODE_PRIVATE);
SharedPreferences.Editor prefsEditor = prefs.edit();
prefsEditor.putFloat(POINT_LATITUDE_KEY, currentlatitude);
prefsEditor.putFloat(POINT_LONGITUDE_KEY, currentlongitude);
prefsEditor.commit();
}
Location retrievelocationFromPreferences(){
SharedPreferences prefs = this.getSharedPreferences(getClass().getSimpleName(), Context.MODE_PRIVATE);
Location location = new Location("POINT_LOCATION");
location.setLatitude(prefs.getFloat(POINT_LATITUDE_KEY, 0));
location.setLongitude(prefs.getFloat(POINT_LONGITUDE_KEY, 0));
return location;
}
}
我真的很感谢一些帮助，它引起了很多关注和困惑
最佳答案
这是我的服务，效果很好，我知道它在市场上可以正常工作，如果您插入JSON，数据库就在哪里，也许您可以根据需要进行更改
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.graphics.Color;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class ProximityService extends Service{
String proximitysd = "com.apps.ProximityService";
int n = 0;
private BroadcastReceiver mybroadcast;
private LocationManager locationManager;
MyLocationListener locationListenerp;
public ProximityService() {
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
mybroadcast = new ProximityIntentReceiver();
locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
double lat;
double lng;
float radius = 50f;
long expiration = -1;
MyDBAdapter db = new MyDBAdapter(this);
Cursor cursor;
db.read();
cursor = db.getAllEntries();
boolean go = cursor.moveToFirst();
while(cursor.isAfterLast() != true){
lat = cursor.getInt(MyDBAdapter.LATITUDE_COLUMN)/1E6;
lng = cursor.getInt(MyDBAdapter.LONGITUDE_COLUMN)/1E6;
String what = cursor.getString(MyDBAdapter.ICON_COLUMN);
String how = cursor.getString(MyDBAdapter.FISH_COLUMN);
String proximitys = "com.apps.ProximityService" + n;
IntentFilter filter = new IntentFilter(proximitys);
registerReceiver(mybroadcast, filter );
Intent intent = new Intent(proximitys);
intent.putExtra("alert", what);
intent.putExtra("type", how);
PendingIntent proximityIntent = PendingIntent.getBroadcast(this, n, intent, PendingIntent.FLAG_CANCEL_CURRENT);
locationManager.addProximityAlert(lat, lng, radius, expiration, proximityIntent);
//sendBroadcast(new Intent(intent));
n++;
cursor.moveToNext();
}
db.close();
cursor.close();
}
@Override
public void onDestroy() {
Toast.makeText(this, "Proximity Service Stopped", Toast.LENGTH_LONG).show();
try{
unregisterReceiver(mybroadcast);
}catch(IllegalArgumentException e){
Log.d("reciever",e.toString());
}
}
@Override
public void onStart(Intent intent, int startid) {
Toast.makeText(this, "Proximity Service Started", Toast.LENGTH_LONG).show();
//IntentFilter filter = new IntentFilter(proximitys);
//registerReceiver(mybroadcast,filter);
}
public class ProximityIntentReceiver extends BroadcastReceiver{
private static final int NOTIFICATION_ID = 1000;
@Override
public void onReceive(Context arg0, Intent arg1) {
String key = LocationManager.KEY_PROXIMITY_ENTERING;
Boolean entering = arg1.getBooleanExtra(key, false);
String here = arg1.getExtras().getString("alert");
String happy = arg1.getExtras().getString("type");
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent pendingIntent = PendingIntent.getActivity(arg0, 0, arg1, 0);
Notification notification = createNotification();
notification.setLatestEventInfo(arg0,
"Entering Proximity!", "You are approaching a " + here + " marker.", pendingIntent);
notificationManager.notify(NOTIFICATION_ID, notification);
}
private Notification createNotification() {
Notification notification = new Notification();
notification.icon = R.drawable.icon;
notification.when = System.currentTimeMillis();
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.flags |= Notification.FLAG_SHOW_LIGHTS;
notification.defaults |= Notification.DEFAULT_VIBRATE;
notification.defaults |= Notification.DEFAULT_LIGHTS;
notification.ledARGB = Color.WHITE;
notification.ledOnMS = 1500;
notification.ledOffMS = 1500;
return notification;
}
//make actions
}
public class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
Toast.makeText(getApplicationContext(), "I was here", Toast.LENGTH_LONG).show();
}
public void onProviderDisabled(String s) {
}
public void onProviderEnabled(String s) {
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
}
}
关于java - 具有多个POI的Android邻近警报，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/18596854/