【发布时间】：2021-11-07 16:30:21
【问题描述】：
我正在开发一个应用程序，它必须尽可能快地获取设备的位置信息（纬度和经度）一次。我的代码花费了太多时间。获取位置大约需要 2-3 分钟。特别是对于那些设备，如果位置按钮最初是关闭的。我碰巧看到一个相关的问题Link below ，但那已经快 6 岁了，我认为答案在 2021 年很合适。我的情况也一样，我还需要收集经度和纬度信息（仅限一次）所以我可以找到两个设备之间的距离。请找到我用于纬度和经度信息的代码，并请告诉我是否有更好的方法来完成我的任务。使用此代码，我将在文本视图中显示当前位置（代码中的 BuyerArea），一旦位置正确显示，我将在 firebase 数据库中保存纬度和经度信息
` 公共类 BuyerAreaFinderActivity 扩展 AppCompatActivity {
String currentGroupName, BuyerLatitude,BuyerLongitude;
Button BuyerAreaFetchBtn, continueBtn;
TextView BuyerArea; // to display location
private FirebaseUser User;
private Task<Void> UserTask;
private FirebaseAuth mAuth;
private DatabaseReference RootRef;
private String currentUserId;
FusedLocationProviderClient fusedLocationProviderClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_buyer_area_finder);
BuyerAreaFetchBtn= findViewById(R.id.buyAfBtn);
continueBtn=findViewById(R.id.continueBtn);
BuyerArea=findViewById(R.id.tv_address);
mAuth=FirebaseAuth.getInstance();
currentUserId=mAuth.getCurrentUser().getUid();
RootRef= FirebaseDatabase.getInstance().getReference();
fusedLocationProviderClient= LocationServices.getFusedLocationProviderClient(
BuyerAreaFinderActivity.this);
BuyerAreaFetchBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!isConnected(this)) { // checking internet connection
Toast.makeText(getApplicationContext(), " Please connect to internet", Toast.LENGTH_SHORT).show();
}else {
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE
);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)
|| locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
if (ActivityCompat.checkSelfPermission(BuyerAreaFinderActivity.this
, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(BuyerAreaFinderActivity.this
, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
getCurrentLocation();
}else {
//when permission is not granted
//Request permission
ActivityCompat.requestPermissions(BuyerAreaFinderActivity.this
, new String[]{Manifest.permission.ACCESS_FINE_LOCATION
, Manifest.permission.ACCESS_COARSE_LOCATION}
, 100);
}
}else {
Toast.makeText(getApplicationContext(), "Please switch on location , We will be sending enquiry to bet shops in your location ", Toast.LENGTH_LONG).show();
startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
}
}
}
});
BuyerArea.addTextChangedListener(new TextWatcher() { //Here I am displaying location, Once displayed correctly I will save latitude and longitude in my database
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) { Here I am displaying location, Once displayed correctly I will save latitude and longitude in my database
HashMap<String, Object>buyerLocationMap = new HashMap<>();
buyerLocationMap.put("buyerLatitude", BuyerLatitude);
buyerLocationMap.put("buyerLongitude", BuyerLongitude);
RootRef.child("Users").child(currentUserId).updateChildren(buyerLocationMap)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if(task.isSuccessful()){
continueBtn.setVisibility(View.VISIBLE);
continueBtn.setEnabled(true);
}else {
String ErrorMessage = task.getException().toString(); // get the error ocuured from net/firebase
Toast.makeText(BuyerAreaFinderActivity.this, "Error : " + ErrorMessage, Toast.LENGTH_SHORT).show();
}
}
});
}
});
continueBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SendToNextActivity(); // next activity
finish();
}
});
}
@SuppressLint("MissingSuperCall")
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//This methood check whether permmission is granted or not after requesting permission using the request code
//here suppress error by right clicking.
if(requestCode ==100 && grantResults.length>0&&(grantResults[0]+grantResults[1]
==PackageManager.PERMISSION_GRANTED)){
//when permission granted
// Call method
getCurrentLocation();
}else {
//when permissions are denied
if (!ActivityCompat.shouldShowRequestPermissionRationale(BuyerAreaFinderActivity.this, Manifest.permission.ACCESS_FINE_LOCATION )
&& !ActivityCompat.shouldShowRequestPermissionRationale(BuyerAreaFinderActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION)) {
//This block here means PERMANENTLY DENIED PERMISSION
new AlertDialog.Builder(BuyerAreaFinderActivity.this)
.setMessage("You have permanently denied this permission, go to settings to enable this permission")
.setPositiveButton("Go to settings", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
gotoApplicationSettings();
}
})
.setNegativeButton("Cancel", null)
.setCancelable(false)
.show();
}else{
Toast.makeText(getApplicationContext(),"Location permission denied, Please click again to allow location permission.",Toast.LENGTH_LONG).show();
}
}
}
@SuppressLint("MissingPermission")
private void getCurrentLocation() {
fusedLocationProviderClient.flushLocations();// used by me for refreshing don't know correct or not
fusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
@Override
public void onComplete(@NonNull Task<Location> task) {
Location location=task.getResult();
//Check condition
if(location !=null){
BuyerLatitude=String.valueOf(location.getLatitude());
BuyerLongitude=String.valueOf(location.getLongitude());
/ ----------------- Geocoder 用于查找地址 如果我们不想显示地址，请不要使用这部分 -------- ---------
Geocoder geocoder = new Geocoder(BuyerAreaFinderActivity.this, Locale.getDefault());
try {
List<Address> addresses = geocoder.getFromLocation(location.getLatitude(),location.getLongitude(),1);
String address = addresses.get(0).getAddressLine(0);
BuyerArea.setText(address);
BuyerAreaFetchBtn.setVisibility(View.INVISIBLE);
} catch (IOException e) {
e.printStackTrace();
}
//------------------up to here for Geocoder-------------------------------------------------------------------------------
}
else {
//Location update.. when location result is null , Initialize location update part
// LocationRequest locationRequest = new LocationRequest() //deprecated so changed by me
LocationRequest locationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10000)
.setFastestInterval(1000)
.setNumUpdates(1);
//Initialize location call back
LocationCallback locationCallback=new LocationCallback(){
@Override
public void onLocationResult(LocationResult locationResult) {
Location location1=locationResult.getLastLocation();
BuyerLatitude=String.valueOf(location1.getLatitude());
BuyerLongitude=String.valueOf(location1.getLongitude());
}
};
// Request location updates, Actually I dont want location updates but removal caused further delay in fetching location.
fusedLocationProviderClient.requestLocationUpdates(locationRequest,locationCallback, Looper.myLooper());
Toast.makeText(getApplicationContext(),"We are collecting your location details. Please wait for few seconds and press the button again",Toast.LENGTH_LONG).show();
fusedLocationProviderClient.removeLocationUpdates(locationCallback);
}
}
});
}
private void gotoApplicationSettings() { // if location is off, this will allow us to open the settings
Intent intent = new Intent();
intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", this.getPackageName(), null);
intent.setData(uri);
startActivity(intent);
}
private boolean isConnected(View.OnClickListener onClickListener) {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo wifiConn = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
NetworkInfo mobileConn = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
return (wifiConn != null && wifiConn.isConnected()) || (mobileConn != null && mobileConn.isConnected());
}
private void SendToNextActivity() {
Intent nextIntent = new Intent(Current.this, Next.class); // Take to next activity
startActivity(nextIntent);
finish();
}
}`
【问题讨论】：
-
这段代码中到底有什么不符合您的预期？告诉我们共享代码有什么问题。你有什么错误吗？
-
@AlexMamo.. 获取位置有延迟，大约 2、3 分钟，
标签： android firebase android-studio location