Hai我试图使用BroadCast Receiver.its正常工作获得gps位置，但我希望每隔半小时获取一次该位置。我使用** MINIMUM_TIME_BETWEEN_UPDATES ** 30mts .i当纬度和经度值发生变化时
更新
public class MainActivity extends Activity implements LocationListener {
final DBAdapter1 db=new DBAdapter1(this);
private ConnectivityReceiver receiver = null;
private TextView txtNetworkInfo ;
private static TextView latituteField;
private static TextView longitudeField;
private LocationManager locationManager;
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
private static final String HostUrl =" http://xxx/Service.svc";
// private static final String HostUrl =" http://yyyService.svc";
private static final String NAMESPACE = "http://tempuri.org/";
private HttpTransportSE httpTransport = new HttpTransportSE(HostUrl);
private String provider;
private SoapObject request=null;
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1800000; // in Milliseconds
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
latituteField = (TextView) findViewById(R.id.TextView02);
longitudeField = (TextView) findViewById(R.id.TextView04);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
Log.i("ConnTest",locationManager.toString());
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
float lat = (float) (location.getLatitude());
float lng = (float) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
} else {
latituteField.setText("provider not available");
longitudeField.setText("provider not available");
}
txtNetworkInfo = (TextView)findViewById(R.id.txtNetworkInfo);
receiver = new ConnectivityReceiver();
registerReceiver(receiver,new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
@Override
protected void onResume() {
super.onResume();
//locationManager.requestLocationUpdates(provider,1000, 1, this);
locationManager.requestLocationUpdates(
provider,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
this
);
}
/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
float lat = (float) (location.getLatitude());
float lng = (float) (location.getLongitude());
longitudeField.setText(String.valueOf(lng));
latituteField.setText(String.valueOf(lat));
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
Toast.makeText(this, "Disenabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
protected void Display(Cursor c) {
Toast.makeText(this, "rowid: " + c.getString(0) + "\n" +
"Latitude: " + c.getString(1) + "\n" + "Longitude: " + c.getString(2) + "\n" +
Toast.LENGTH_LONG, 0).show();
}
@Override
protected void onDestroy() {
unregisterReceiver(receiver);
super.onDestroy();
}
private String getNetworkStateString(NetworkInfo.State state){
String stateString = "Unknown";
switch(state)
{
case CONNECTED: stateString = "Connected"; break;
case CONNECTING: stateString = "Connecting"; break;
case DISCONNECTED: stateString = "Disconnected"; break;
case DISCONNECTING: stateString = "Disconnecting"; break;
case SUSPENDED: stateString = "Suspended"; break;
default: stateString = "Unknown"; break;
}
return stateString;
}
private class ConnectivityReceiver extends BroadcastReceiver{
private Timer mTimer;
private TimerTask mTimerTask;
@Override
public void onReceive(Context context, Intent intent) {
NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if(null != info)
{
String state = getNetworkStateString(info.getState());
if(state.equals("Connected")){
try{
mTimer = new Timer();
mTimer.scheduleAtFixedRate(mTimerTask,1000,1800000);
mTimerTask = new TimerTask() {
@Override
public void run() {
SoapPrimitive response=null;
final String methodname="InsertAllGPSInformation";
request = new SoapObject(NAMESPACE,methodname);
envelope.dotNet = true;
request.addProperty("Longitude",longitudeField.getText().toString());
request.addProperty("Latitude",latituteField.getText().toString());
request.addProperty("Date",newtime);
envelope.setOutputSoapObject(request);
String result = null;
try
{
httpTransport.call(NAMESPACE+"IService/"+methodname, envelope);
response = ( SoapPrimitive )envelope.getResponse();
result=response.toString();
}
catch(Exception e)
{
Toast.makeText(getBaseContext(), "Your Net Connected or Not Login to Net"+"", Toast.LENGTH_LONG).show();
Log.e("Upload Picture Error:",e.getMessage());
}
}
};
}
catch(Exception e)
{
Toast.makeText(getBaseContext(),e.getMessage()+"", Toast.LENGTH_LONG).show();
Log.e("Upload Picture Error:",e.getMessage());
}
答案 0 :(得分：0)
我想问题是“我为什么每30分钟获得一次更新？”：
然后答案是：“通知的最小时间间隔，以毫秒为单位。此字段仅用作节省电力的提示，位置更新之间的实际时间可能大于或小于此值。” 见http://developer.android.com/reference/android/location/LocationManager.html
或者，您可以使用处理程序或每隔30'触发一次警报，并在警报触发时请求单个位置更新。从API 9开始，有一个requestSingleUpdate（）。
答案 1 :(得分：0)
使用Alarm Manager。因为你的计时器可能会死但是闹钟会唤醒你的应用。试试这个工作代码：它每10分钟唤醒CPU并显示通知。
添加到Manifest.xml：
...
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
...
<receiver android:process=":remote" android:name="Alarm"></receiver>
...
代码：
public class Alarm extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "YOUR TAG");
wl.acquire();
// Put here YOUR code.
Toast.makeText(context, "Alarm !!!!!!!!!!", Toast.LENGTH_LONG).show(); // For example
wl.release();
}
public void SetAlarm(Context context)
{
AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(context, Alarm.class);
PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * 60 * 10, pi); // Millisec * Second * Minute
}
public void CancelAlarm(Context context)
{
Intent intent = new Intent(context, Alarm.class);
PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(sender);
}
}