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我有一個已保存的地理位置（緯度，經度）。當用戶在應用中按下動作按鈕時，會記錄當前位置。檢查圓形地理圍欄內的地理位置（緯度，經度）
我想檢查當前的緯度，經度（我有）在圓形地理圍欄（誰是我的中心地理點）下降了 。
我不想在Google地圖上創建地理圍欄。我只想檢查地理位置是否落入地理圍欄。
的代碼我用它來獲取當前地理位置時精度小於20：
public class CreatePlaceActivity extends Fragment implements
OnClickListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
private Button cancelBtn, submitBtn;
public boolean geoLocationCheck = false;
private String TAG = "CreatePlaceActivity";
public CreatePlaceActivity() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.create_place_screen,
container, false);
submitBtn = (Button) rootView.findViewById(R.id.submit_btn_id);
submitBtn.setTypeface(typeface);
submitBtn.setOnClickListener(this);
cancelBtn = (Button) rootView.findViewById(R.id.cancel_btn_id);
cancelBtn.setOnClickListener(this);
setlocationClient();
return rootView;
}
private void setlocationClient() {
int resp = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getActivity());
if (resp == ConnectionResult.SUCCESS) {
locationclient = new GoogleApiClient.Builder(getActivity())
.addApi(LocationServices.API).addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
locationclient.connect();
} else {
GooglePalyErrorDialogIsShowing = true;
Toast.makeText(getActivity(),// CreatePlaceActivity.this,
"Google Play Service Error " + resp, Toast.LENGTH_LONG)
.show();
if (alert == null) {
onLocationChangedbuilder = new AlertDialog.Builder(
getActivity(), AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
} else if (alert.isShowing()) {
alert.dismiss();
onLocationChangedbuilder = new AlertDialog.Builder(
getActivity(), AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
}
onLocationChangedbuilder
.setTitle("Alert!")
.setMessage("Google Play Service Error " + resp)
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
locationLockDialogIsShowing = false;
GooglePalyErrorDialogIsShowing = false;
((MenuActivity) getActivity())
.removeFragment(CreatePlaceActivity.this);
}
});
alert = onLocationChangedbuilder.create();
alert.setCancelable(false);
try {
alert.show();
} catch (Exception e) {
}
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.submit_btn_id:
Log.i(TAG, "lat=" + currentGeoLocation.getLatitude() + "lon="
+ currentGeoLocation.getLongitude() + "acc="
+ currentGeoLocation.getAccuracy() + "alt="
+ currentGeoLocation.getAltitude());
validatePlace();
break;
case R.id.cancel_btn_id:
// finish();
((MenuActivity) getActivity())
.removeFragment(CreatePlaceActivity.this);
break;
default:
break;
}
}
@Override
public void onLocationChanged(Location location) {
float accuracy = 50;
// DateTime dt1 = new DateTime();
// DateTimeFormatter fmt1 = ISODateTimeFormat.dateTime();
Time time = new Time();
time.setToNow();
String strdt = String.valueOf(time.toMillis(false));
if (location != null) {
accuracy = location.getAccuracy();
locationLockDialogIsShowing = true;
if (globalAccuracy - location.getAccuracy() >= 20
|| globalAccuracy - location.getAccuracy() >= -20) {
globalAccuracy = location.getAccuracy();
}
}
if (alert == null) {
onLocationChangedbuilder = new AlertDialog.Builder(getActivity(),
AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
} else if (alert.isShowing()) {
alert.dismiss();
onLocationChangedbuilder = new AlertDialog.Builder(getActivity(),
AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
}
final float accr = accuracy;
onLocationChangedbuilder
.setTitle("Alert!")
.setMessage(
"Getting the best possible location..Please wait.\nCurrent Accuracy is "
+ accuracy)
.setPositiveButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
locationLockDialogIsShowing = false;
if (locationclient != null) {
locationclient.disconnect();
}
Time time = new Time();
time.setToNow();
String strdt = String.valueOf(time
.toMillis(false));
if (alert == null) {
} else if (alert.isShowing()) {
alert.dismiss();
}
if (locationLockAlert == null) {
} else if (locationLockAlert.isShowing()) {
locationLockAlert.dismiss();
}
// setResult(RESULT_OK);
// finish();
((MenuActivity) getActivity())
.removeFragment(CreatePlaceActivity.this);
}
});
alert = onLocationChangedbuilder.create();
alert.setCancelable(false);
try {
alert.show();
} catch (Exception e) {
}
if (location.getAccuracy() <= 16) {
DateTime dt = new DateTime();
DateTimeFormatter fmt = ISODateTimeFormat.dateTime();
String str1 = fmt.print(dt);
locationLockDialogIsShowing = false;
Time timeNow = new Time();
timeNow.setToNow();
String str = String.valueOf(timeNow.toMillis(false));
// locationLockTimestamp = str1;
// TODO
currentGeoLocation = location;
if (locationclient != null) {
if (locationclient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(
locationclient, this);
locationclient.disconnect();
}
}
if (alert.isShowing()) {
alert.dismiss();
}
if (locationLockAlert != null) {
if (locationLockAlert.isShowing()) {
locationLockAlert.dismiss();
}
}
showDialog("Alert!",
"GPS Location locked.. You can now continue to create place");
}
}
@Override
public void onConnectionFailed(ConnectionResult result) {
// TODO Auto-generated method stub
}
@Override
public void onConnected(Bundle connectionHint) {
// TODO Auto-generated method stub
final float accuracy = 250;
if (locationclient != null && locationclient.isConnected()) {
if (geoLocationCheck == false) {
locationrequest = LocationRequest.create();
locationrequest
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationrequest.setInterval(100);
// locationclient.requestLocationUpdates(locationrequest, this);
LocationServices.FusedLocationApi.requestLocationUpdates(
locationclient, locationrequest, this);
locationLockDialogIsShowing = true;
if (alert == null) {
onLocationChangedbuilder = new AlertDialog.Builder(
getActivity(),
AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
} else if (alert.isShowing()) {
alert.dismiss();
onLocationChangedbuilder = new AlertDialog.Builder(
getActivity(),
AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
}
onLocationChangedbuilder
.setTitle("Alert!")
.setMessage(
"Getting the best possible location..Please wait.\nCurrent Accuracy is "
+ accuracy)
.setPositiveButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
locationLockDialogIsShowing = false;
if (locationclient != null) {
locationclient.disconnect();
}
Time time = new Time();
time.setToNow();
String strdt = String.valueOf(time
.toMillis(false));
if (alert == null) {
} else if (alert.isShowing()) {
alert.dismiss();
}
if (locationLockAlert == null) {
} else if (locationLockAlert
.isShowing()) {
locationLockAlert.dismiss();
}
// setResult(RESULT_OK);
// finish();
((MenuActivity) getActivity())
.removeFragment(CreatePlaceActivity.this);
}
});
alert = onLocationChangedbuilder.create();
alert.setCancelable(false);
try {
alert.show();
} catch (Exception e) {
}
}
}
}
@Override
public void onConnectionSuspended(int arg0) {
Log.i("fused", "loc client onConnectionSuspended");
}
public Dialog showDialog(String title, String msg) {
locationLockAlert = new AlertDialog.Builder(getActivity(),
AlertDialog.THEME_DEVICE_DEFAULT_LIGHT).create();
locationLockAlert.setTitle(title);
locationLockAlert.setMessage(msg);
locationLockAlert.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
locationLockAlert.dismiss();
}
});
try {
locationLockAlert.show();
} catch (Exception e) {
}
return locationLockAlert;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
}
鏈接我剛纔提到是Android Geofencing (Polygon)
謝謝！
這是距離公式。
http://en.wikipedia.org/wiki/Pythagorean_theorem僅適用於noobs？或簡單的'location.distanceTo（）' – injecteer