要获取强制刷新位置,可以使用Fused Location Provider API中的requestLocationUpdates()方法,并在LocationRequest对象中设置setNumUpdates()方法为1。这将确保只获取一次位置更新。
以下是一个示例代码:
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_CODE_LOCATION_PERMISSION = 1;
private FusedLocationProviderClient fusedLocationProviderClient;
private LocationCallback locationCallback;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
locationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
Location location = locationResult.getLastLocation();
if (location != null) {
// 在这里处理获取到的位置信息
Toast.makeText(MainActivity.this, "Location: " + location.getLatitude() + ", " + location.getLongitude(), Toast.LENGTH_SHORT).show();
}
}
};
// 检查是否有位置权限
if (ContextCompat.checkSelfPermission(
this, Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED) {
// 如果没有权限,则请求权限
ActivityCompat.requestPermissions(
this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
REQUEST_CODE_LOCATION_PERMISSION
);
} else {
// 如果有权限,则开始获取位置
startLocationUpdates();
}
}
private void startLocationUpdates() {
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setNumUpdates(1); // 设置为1以获取一次位置更新
fusedLocationProviderClient.requestLocationUpdates(
locationRequest,
locationCallback,
null
);
}
@Override
public void onRequestPermissionsResult(
int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CODE_LOCATION_PERMISSION && grantResults.length > 0) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// 如果获得了位置权限,则开始获取位置
startLocationUpdates();
} else {
Toast.makeText(this, "Location permission denied", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
// 停止位置更新
fusedLocationProviderClient.removeLocationUpdates(locationCallback);
}
}
上述代码首先检查是否有位置权限,如果没有,则请求权限。如果有权限,则调用startLocationUpdates()
方法开始获取位置。在startLocationUpdates()
方法中,创建一个LocationRequest对象,并设置setNumUpdates()方法为1。然后调用requestLocationUpdates()
方法来获取位置。获取到位置后,会在onLocationResult()
方法中处理获取到的位置信息。
最后,在Activity的onDestroy()方法中,停止位置更新,以避免在Activity销毁时继续获取位置更新。