申请定位权限。在工程的"Manifest"文件中添加相关权限。
在Android Q版本中，如果您需要应用程序在后台执行时也具备持续定位能力，需要在"Manifest"文件中添加ACCESS_BACKGROUND_LOCATION权限。
在"RequestLocationUpdatesWithCallbackActivity.Java"中动态申请相关权限。
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.P) {
Log.i(TAG, "sdk < 28 Q");
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
String[] strings =
{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION};
ActivityCompat.requestPermissions(this, strings, 1);
}
} else {
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this,
"android.permission.ACCESS_BACKGROUND_LOCATION") != PackageManager.PERMISSION_GRANTED){
String[] strings = {android.Manifest.permission.ACCESS_FINE_LOCATION,
android.Manifest.permission.ACCESS_COARSE_LOCATION,
"android.permission.ACCESS_BACKGROUND_LOCATION"};
ActivityCompat.requestPermissions(this, strings, 2);
}
}
"RequestLocationUpdatesWithCallbackActivity.Java"权限申请结果回调。
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
Log.i(TAG, "onRequestPermissionsResult: apply LOCATION PERMISSION successful");
} else {
Log.i(TAG, "onRequestPermissionsResult: apply LOCATION PERMISSSION failed");
}
}
if (requestCode == 2) {
if (grantResults.length > 2 && grantResults[2] == PackageManager.PERMISSION_GRANTED
&& grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
Log.i(TAG, "onRequestPermissionsResult: apply ACCESS_BACKGROUND_LOCATION successful");
} else {
Log.i(TAG, "onRequestPermissionsResult: apply ACCESS_BACKGROUND_LOCATION failed");
}
}
}
后续步骤均可参考"RequestLocationUpdatesWithCallbackActivity.Java"文件。
创建位置信息提供者客户端和设备设置客户端。// 定位交互接入对象
private FusedLocationProviderClient fusedLocationProviderClient;
//位置相关设置检查对象
private SettingsClient settingsClient;
//create a fusedLocationProviderClient
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
//create a settingsClient
settingsClient = LocationServices.getSettingsClient(this);
创建位置信息请求体。LocationRequest mLocationRequest;
mLocationRequest = new LocationRequest();
// set the interval for location updates, in milliseconds.
mLocationRequest.setInterval(10000);
// set the priority of the request.
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
创建结果回调类。LocationCallback mLocationCallback;
mLocationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
if (locationResult != null) {
Listlocations = locationResult.getLocations();
if (!locations.isEmpty()) {
for (Location location : locations) {
Log.i(TAG,"onLocationResult location[Longitude,Latitude,Accuracy]:" + location.getLongitude() + "," + location.getLatitude() + "," + location.getAccuracy());
}
}
}
}
@Override
public void onLocationAvailability(LocationAvailability locationAvailability) {
if (locationAvailability != null) {
boolean flag = locationAvailability.isLocationAvailable();
Log.i(TAG, "onLocationAvailability isLocationAvailable:" + flag);
}
}
};
请求位置更新。/**
* function：Requests location updates with a callback on the specified Looper thread.
* first：use SettingsClient object to call checkLocationSettings(LocationSettingsRequest locationSettingsRequest) method to check device settings.
* second：use FusedLocationProviderClient object to call requestLocationUpdates (LocationRequest request, LocationCallback callback, Looper looper) method.
*/
private void requestLocationUpdatesWithCallback() {
try {
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
builder.addLocationRequest(mLocationRequest);
LocationSettingsRequest locationSettingsRequest = builder.build();
// check devices settings before request location updates.
settingsClient.checkLocationSettings(locationSettingsRequest)
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
Log.i(TAG, "check location settings success");
// request location updates.
fusedLocationProviderClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.getMainLooper()).addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(Void aVoid) {
Log.i(TAG, "requestLocationUpdatesWithCallback onSuccess");
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(Exception e) {
Log.e(TAG,
"requestLocationUpdatesWithCallback onFailure:" + e.getMessage());
}
});
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(Exception e) {
Log.e(TAG, "checkLocationSetting onFailure:" + e.getMessage());
int statusCode = ((ApiException) e).getStatusCode();
switch (statusCode) {
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
try {
ResolvableApiException rae = (ResolvableApiException) e;
rae.startResolutionForResult(RequestLocationUpdatesWithCallbackActivity.this, 0);
} catch (IntentSender.SendIntentException sie) {
Log.e(TAG, "PendingIntent unable to execute request.");
}
break;
}
}
});
} catch (Exception e) {
Log.e(TAG, "requestLocationUpdatesWithCallback exception:" + e.getMessage());
}
}
移除位置信息更新请求。private void removeLocationUpdatesWithCallback() {
try {
fusedLocationProviderClient.removeLocationUpdates(mLocationCallback)
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(Void aVoid) {
Log.i(TAG, "removeLocationUpdatesWithCallback onSuccess");
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(Exception e) {
Log.e(TAG, "removeLocationUpdatesWithCallback onFailure:" + e.getMessage());
}
});
} catch (Exception e) {
Log.e(TAG, "removeLocationUpdatesWithCallback exception:" + e.getMessage());
}
}
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