以下代码将每30秒更新一次用户位置，如果位置大于半径，则进行一些计算，然后将SMS消息发送到电话号码。
我的问题是，如何每5分钟发送一条短信，每隔30秒发一次更新位置？
怎么办呢？有什么建议吗？
/*
* Constants for location update parameters
*/
// Milliseconds per second
public static final int MILLISECONDS_PER_SECOND = 1000;
// The update interval
public static final int UPDATE_INTERVAL_IN_SECONDS = 30;///////////////////////////////////////////
// A fast interval ceiling
public static final int FAST_CEILING_IN_SECONDS = 1;
// Update interval in milliseconds
public static final long UPDATE_INTERVAL_IN_MILLISECONDS =
MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
// A fast ceiling of update intervals, used when the app is visible
public static final long FAST_INTERVAL_CEILING_IN_MILLISECONDS =
MILLISECONDS_PER_SECOND * FAST_CEILING_IN_SECONDS;
// A request to connect to Location Services
private LocationRequest mLocationRequest;
/*
* Note if updates have been turned on. Starts out as "false"; is set to "true" in the
* method handleRequestSuccess of LocationUpdateReceiver.
*
*/
boolean mUpdatesRequested = false;
@Override
protected void onCreate(Bundle savedInstanceState) {////////////////////////////////////////////
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_patient__tracing);
info = (TextView) findViewById(R.id.info);
if (servicesConnected()) ///////////////////////////////////////////////////////////////////
{
/*
* Create a new location client, using the enclosing class to
* handle callbacks.
*/
googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
// Create a new global location parameters object
mLocationRequest = LocationRequest.create();
/*
* Set the update interval - This acts as minimum which values are requested from the app
*/
mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
// Use high accuracy
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
// Set the interval ceiling to one second - This acts as maximum which get fed when location is available by other apps
mLocationRequest.setFastestInterval(FAST_INTERVAL_CEILING_IN_MILLISECONDS);
// Note that location updates are off until the user turns them on
mUpdatesRequested = false;
ToggleButton button = (ToggleButton) findViewById(R.id.serviceSwitch);
button.setChecked(mUpdatesRequested);
button.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton button, boolean isChecked) {
if (!isChecked) {
stopPeriodicUpdates();
} else
startPeriodicUpdates();
}
});
}
/**
* Verify that Google Play services is available before making a request.
*
* @return true if Google Play services is available, otherwise false
*/
private boolean servicesConnected() {
// Check that Google Play services is available
int resultCode =
GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
Log.d(this.getClass().getSimpleName(), "available " + "");
// Continue
return true;
// Google Play services was not available for some reason
} else {
Log.d(this.getClass().getSimpleName(), "not available " + "");
return false;
}
}
/*
* Called when the Activity is restarted, even before it becomes visible.
*/
@Override
public void onStart() {
super.onStart();
/*
* Connect the client. Don't re-start any requests here;
* instead, wait for onResume()
*/
googleApiClient.connect();
}
/*
* Called when the Activity is no longer visible at all.
* Stop updates and disconnect.
*/
@Override
public void onStop() {
stopPeriodicUpdates();
// After disconnect() is called, the client is considered "dead".
googleApiClient.disconnect();
super.onStop();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.d(this.getClass().getSimpleName(), "onConnectionFailed " + "");
//TODO inform user there is somehting wrong
}
@Override
public void onConnected(Bundle connectionHint) {
Log.d(this.getClass().getSimpleName(), "onConnected ");
//TODO do things here
getCurrentLocation();
}
private void getCurrentLocation() {
if (googleApiClient.isConnected()) {
Location loc = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
double lat = loc.getLatitude();
double lon = loc.getLongitude();
double alt = loc.getAltitude();
float acc = loc.getAccuracy();
long time = loc.getTime();
String loc_info = "lat: " + lat + " lon: " + lon + " alt: " + alt + " acc: " + acc + " time: " + time;
Log.d(this.getClass().getSimpleName(), loc_info);
}
}
/**
* In response to a request to start updates, send a request
* to Location Services
*/
private void startPeriodicUpdates() {//////////////////////////////////////////
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, mLocationRequest, this);
}
@Override
public void onLocationChanged(Location loc) {///////////////////////////
//Location update
double lat1=22.762503862128362;// must be at create
double lon1=39.08618710935116;//must in create take it from main region table
double lat = loc.getLatitude();
double lon = loc.getLongitude();
double alt = loc.getAltitude();
float acc = loc.getAccuracy();
long time = loc.getTime();
String loc_info ="location Chaned lat: " + lat +" lon: " + lon +" alt: " + alt + " acc: " + acc +" time: " + time;
Log.d(this.getClass().getSimpleName(), loc_info );
CalculateDis(lat1,lon1,lat,lon);
new insertUserTask(lat,lon).execute();
info.setText(loc_info);
} double raduis=15;
private void CalculateDis(double lat1,double lon1,double lat2,double lon2){
double earth_raduis=6371000;//METERS
double lat1Rad=Math.toRadians(lat1);
double lat2Rad=Math.toRadians(lat2);
double diffLongRad=Math.toRadians(lon2-lon1);
double a=Math.sin(lat1Rad)*Math.sin(lat2Rad);
double b=Math.cos(lat1Rad)*Math.cos(lat2Rad)*Math.cos(diffLongRad);
double radDis=Math.acos(a+b);
double distance=radDis*earth_raduis;
if (distance>raduis){
Toast.makeText(getApplicationContext(), "patient out side" , Toast.LENGTH_SHORT).show();
String phoneNo="0555555555";
String sms = "text Sms" ;
Toast.makeText(getApplicationContext(), "patient out side" , Toast.LENGTH_SHORT).show();
try{
SmsManager smsManager = SmsManager.getDefault();
ArrayList<String> parts = smsManager.divideMessage(sms);
smsManager.sendMultipartTextMessage(phoneNo, null, parts, null, null);
Toast.makeText(getApplicationContext(), "SMS Sent!",
Toast.LENGTH_LONG).show();}
catch (Exception e){
Toast.makeText(getApplicationContext(),
"SMS faild, please try again later!",
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
else
Toast.makeText(getApplicationContext(), "patient in side" , Toast.LENGTH_SHORT).show();
}
答案 0 :(得分：0)
基本上你需要CountDownTimer类（可能解决方案的一个实例）。我成功地使用了我自己的项目。我希望它会有所帮助。
public class MyCountDownTimer extends CountDownTimer {
public MyCountDownTimer(long startTime, long interval) {
super(startTime, interval);
}
@Override
public void onFinish() {
//send sms
}
@Override
public void onTick(long millisUntilFinished) {
long time = millisUntilFinished / 1000;
Log.v("timer: ", ""+time);
}
}
//use it like
private final long startTime = 30 * 1000; //it is 30 second change it for your own requirement
private final long interval = 1 * 1000; // 1 second interval
CountDownTimer cDownTimer = new MyCountDownTimer(startTime, interval);
//and start timer using
cDownTimer.start();
//and stop timer using
cDownTimer.cancel();
// something like that