我刚刚开始学习android，但是无法理解，如何处理这个问题，所以如果我在公共汽车上旅行，我想存储每2分钟的位置坐标。
我在用什么：
public class AndroidGPSTrackingActivity extends Activity {
Button btnShowLocation;
// GPSTracker class
GPSTracker gps;
TextView tv;
ArrayList<String> cordsList= new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv=new TextView(this);
btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
btnShowLocation.setText("Start Save Location");
Log.i("Finall", "AndroidGPSTrackingActivity-> ");
// show location button click event
btnShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// create class object
gps = new GPSTracker(AndroidGPSTrackingActivity.this);
// check if GPS enabled
if(gps.canGetLocation()){
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
String longlat=String.valueOf(latitude)+":"+String.valueOf(longitude);
cordsList.add(longlat);
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
Log.i("Finall", "Location-> "+cordsList.toString());
}
});
}
我准时到达，但无法获得每30个以及在哪里存放。
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 2; // 2 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
10000, // 3 sec
10, this);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
Log.i("location", "->longitude>> "+longitude);
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
Log.i("location", "latitude->longitude>> "+latitude);
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
Log.i("latitude", "latitude-> "+latitude);
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
Log.i("longitude", "longitude-> "+latitude);
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
Log.i("onLocationChanged", "onLocationChanged-> "+latitude+"---- "+longitude);
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.i("onStatusChanged", "onLocationChanged-> "+latitude+"---- "+longitude);
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
你好，每个人，任何想法，如果我乘坐公共汽车和我的GPS然后我旅行20分钟，那么我想在阵列中保存10个坐标。任何想法，如何做到这一点。单击“停止”按钮后停止。
感谢Adavance。
答案 0 :(得分：0)
你可以使用android中的Timer类，它会给你TIME_INTERVAL来调用那个类。在你的情况下，你可以给出 TIME_INTERVAL = 20000
这是我的示例代码：
public class MainActivity extends Activity {
Timer timer = new Timer();
GpsTracker gpsTracker ;
ArrayList<Double> arrLat= new ArrayList<Double>();
ArrayList<Double> arrLng = new ArrayList<Double>();
private final int TIME_INTERVAL = 20000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gpsTracker = new GPSTracker(this);
timer.scheduleAtFixedRate(new TimerTask() {
@SuppressLint("DefaultLocale")
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@Override
public void run() {
latitude = GPSTracker.getLatitude();
longitude = GPSTracker.getLongitude();
System.out.println("lat------ "+latitude);
System.out.println("lng-------- "+longitude);
arrLat.add(latitude);
arrLng.add(longitude);
}
}, 0, TIME_INTERVAL);
}
}