我正在制作一个应用程序，向您显示 map ，您可以添加带有一些信息的自定义标记。我仍在努力将其连接到数据库以保存所有内容。
因此，每次我运行我的应用程序并且它没有允许的权限时，它都会请求它们。然后，它应该以当前位置为中心并缩放 map 。但是，它不会执行任何操作，如果您单击屏幕，它只会变成蓝色。如果我关闭应用程序并重新打开它，它就会正常工作。
我不确定是否是因为权限请求是异步的，并且 map 失败并停止请求位置，因为当我查看 logcat 时，它不时显示“成功插入 1 个位置”，它只是永远不会在角落添加标准蓝点标记或 myLocation 按钮， map 只会变成蓝色并且什么也不显示。
这是我的主类代码:
package com.example.lipel.mapeador003;
import android.Manifest;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Handler;
import android.os.Looper;
import android.os.ResultReceiver;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.AppCompatCallback;
import android.support.v7.app.AppCompatDelegate;
import android.support.v7.view.ActionMode;
import android.util.Log;
import android.view.Menu;
import android.support.v7.widget.Toolbar;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.SettingsClient;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.UiSettings;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import static com.google.android.gms.location.LocationServices.getFusedLocationProviderClient;
public class Mapa extends FragmentActivity implements OnMapReadyCallback, AppCompatCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener, GoogleMap.OnMyLocationButtonClickListener {
public static final String TAG = Mapa.class.getSimpleName(); //Tag de log para verificar no Run
private static final int MY_PERMISSIONS_ACCESS_FINE_LOCATION = 1; //Variável que permite identificar se aplicativo é autorizado a utilizar localização pelo usuário
private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 1000; //Variável que faz request de o que fazer com Google Play API caso haja falha
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private AppCompatDelegate delegate; //Para resolver problemas de implementação
private GoogleMap mMap; //Mapa do aplicativo
private FusedLocationProviderClient mFusedLocationClient; //Cliente que puxa a localização atual do celular
private Location mLocalizacaoAtual; //Objeto que salva localização atual para marcador
private Marker mark; //Marcador da localização atual
private LocationRequest locReq; //Objeto que permite puxar localização contínua
private GoogleApiClient googleAPI; //API google para puxar localizações contínuas
private GoogleApiAvailability gAAPI; //Verifica se a API do google está instalada ou funcionando
private LocationCallback loccall;
static final int ADICIONAR_MARCADOR = 1;
private static final long INTERVAL = 10000; //Número que permite definir com facilidade o intervalo de chamada de localização
private static final long FASTEST_INTERVAL = 5000; //Número que permite definir com facilidade o mínimo intervalo de chamada de localização
// Configura os pedidos de localização: seus intervalos e precisão
protected void createLocationRequest() {
locReq = new LocationRequest();
locReq.setInterval(INTERVAL);
locReq.setFastestInterval(FASTEST_INTERVAL);
locReq.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
//Checa o status do Google Play Services
private boolean checkPlayServices() {
gAAPI = GoogleApiAvailability.getInstance();
int resultAAPI = gAAPI.isGooglePlayServicesAvailable(this);
if (resultAAPI != ConnectionResult.SUCCESS) {
//Verifica se é um erro que pode ser resolvido na aplicação ou pelo usuário
if (gAAPI.isUserResolvableError(resultAAPI)) {
gAAPI.getErrorDialog(this, resultAAPI, PLAY_SERVICES_RESOLUTION_REQUEST).show();
}
//retorna falso se não puder ser resolvido
return false;
}
//retorna verdadeiro se não encontra erro, ou seja, se tiver sucesso
return true;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Verifica se o Google Play Services está funcionando. Se não, dá finish na OnCreate e não continua
if (!checkPlayServices()) {
finish();
}
// Coloca o mapa na activity
setContentView(R.layout.activity_mapa);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// Habilita a API de localização do Google que permite encontrar última localização
mFusedLocationClient = getFusedLocationProviderClient(this);
//Adiciona suporte para barra de ferramentas, permitindo multiplos implement
delegate = AppCompatDelegate.create(this, this);
delegate.onCreate(savedInstanceState);
Toolbar myToolbar = findViewById(R.id.toolbar);
delegate.setSupportActionBar(myToolbar);
//Utilizado para iniciar o aplicativo na tela de ativar localização
/*Intent gpsOptionsIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(gpsOptionsIntent);*/
}
private boolean checkPermissions() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED)
return true;
else {
requestPermissions();
}
return false;
}
//Pede as permissões
private void requestPermissions() {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_ACCESS_FINE_LOCATION);
}
//Verifica as permissões do aplicativo
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_ACCESS_FINE_LOCATION: {
// Coloca as permissões em ordem e checa se elas estão habilitadas.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//Se aplicativo não foi permitido depois de perguntar, o fecha
} else {
moveTaskToBack(true);
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
return;
}
}
}
//Inicia o app com a localização atual
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
//Pede permissões
if (checkPermissions()) {
mMap.setMyLocationEnabled(true);
}
//Cria um listener para pegar última localização do celular
mFusedLocationClient.getLastLocation().addOnSuccessListener(this, new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
//Se encontra a localização (App autorizado e localização ligada), aplica tal localização no mapa
if (location != null) {
LatLng rj1 = new LatLng(location.getLatitude(), location.getLongitude());
//mark = mMap.addMarker(new MarkerOptions().position(rj1).title("Posição Atual"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(rj1));
mMap.setMinZoomPreference(15);
//Salva localização atual em um objeto Location
mLocalizacaoAtual = new Location("");
mLocalizacaoAtual.setLatitude(location.getLatitude());
mLocalizacaoAtual.setLongitude(location.getLongitude());
mMap.animateCamera(CameraUpdateFactory.zoomTo(18));
mMap.getUiSettings().setCompassEnabled(true);
mMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener() {
@Override
public boolean onMyLocationButtonClick() {
mMap.moveCamera(CameraUpdateFactory.newLatLng(getLatLng()));
mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
return true;
}
});
}
}
});
}
//Inicia o serviço de atualização constante de localização
protected void startLocationUpdates() {
Log.v("LocationUpdates","ok");
//Inicia o serviço de localização contínuo e adiciona o que ele utilizará para localizar, depois o construindo
createLocationRequest();
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder(); //Builder que permite configurar intervalos, etc de pedidos de localização
builder.addLocationRequest(locReq);
LocationSettingsRequest locSetReq = builder.build();
SettingsClient settingsClient = LocationServices.getSettingsClient(this);
settingsClient.checkLocationSettings(locSetReq);
getFusedLocationProviderClient(this).requestLocationUpdates(locReq, loccall = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
if (locationResult != null){
onLocationChanged(locationResult.getLastLocation());
}
}
}, Looper.myLooper());
}
@Override
public void onLocationChanged(Location location){
if (location != null){
if (checkPermissions()){
mLocalizacaoAtual = new Location("");
}
mLocalizacaoAtual.setLatitude(location.getLatitude());
mLocalizacaoAtual.setLongitude(location.getLongitude());
mMap.setMinZoomPreference(15);
}
else
{
mLocalizacaoAtual.setLatitude(0.00);
mLocalizacaoAtual.setLongitude(0.00);
}
//if (mark != null)
// mark.remove();
LatLng Ll = new LatLng(location.getLatitude(), location.getLongitude());
//MarkerOptions mpo = new MarkerOptions();
//mpo.position(Ll);
//mpo.title("Posição Atual");
//mark = mMap.addMarker(mpo);
}
@Override
public void onStart() {
super.onStart();
googleAPI = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
googleAPI.connect();
Log.v("onStart","ok");
}
@Override
public void onStop() {
super.onStop();
googleAPI.disconnect();
}
@Override
public void onConnected(Bundle bundle) {
Task<Location> loc = LocationServices.getFusedLocationProviderClient(this).getLastLocation();
startLocationUpdates();
Log.v("onConnected","ok");
}
private void handleNewLocation(Task<Location> location){
Log.d(TAG, location.toString());
}
private void handleNewLocation (Location location){
Log.d(TAG, location.toString());
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onResume(){
super.onResume();
googleAPI.connect();
}
@Override
public void onPause(){
super.onPause();
googleAPI.disconnect();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
// Tenta corrigir o erro
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
}
} else {
Log.i(TAG, "Conexão falhou com código: " + connectionResult.getErrorCode());
}
}
@Override
public void onSupportActionModeStarted(ActionMode actionMode) {
}
@Override
public void onSupportActionModeFinished(ActionMode actionMode) {
}
@Nullable
@Override
public ActionMode onWindowStartingSupportActionMode(ActionMode.Callback callback) {
return null;
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
//Permite pegar os itens da barra de ferramenta de seu XML
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_items, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.adicionar:
Bundle args = new Bundle();
args.putDouble("long_dataProvider", getLongitude());
args.putDouble("lat_dataProvider", getLatitude());
Intent adInt = new Intent(this, Adicionar.class);
adInt.putExtras(args);
startActivityForResult(adInt, ADICIONAR_MARCADOR);
return true;
case R.id.lista:
Intent listInt = new Intent(this, Lista.class);
startActivity(listInt);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
protected LatLng getLatLng(){
return new LatLng(mLocalizacaoAtual.getLatitude(),mLocalizacaoAtual.getLongitude());
}
protected double getLatitude(){
return mLocalizacaoAtual.getLatitude();
}
protected double getLongitude(){
return mLocalizacaoAtual.getLongitude();
}
protected GoogleMap getMap(){return mMap;}
protected Location getCurrLoc(){return mLocalizacaoAtual;}
@Override
protected void onActivityResult(int reqCode, int resCode, Intent resultIntent){
if (reqCode == ADICIONAR_MARCADOR) {
if (resCode == RESULT_OK){
String markNom = resultIntent.getStringExtra("nome");
String markDescr = resultIntent.getStringExtra("descr");
Double markLat = resultIntent.getDoubleExtra("lat", getLatitude());
Double markLong = resultIntent.getDoubleExtra("long", getLongitude());
//Call function to add marker into DB and then from the DB to the map
//For now, testing directly here
mMap.addMarker(new MarkerOptions()
.position(new LatLng(markLat,markLong))
.title(markNom)
.snippet(markDescr)
);
//Do stuff with intent. Get the title, lat, long, nome, descrição
}
}
}
@Override
public boolean onMyLocationButtonClick(){
mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
return true;
}
//protected void zoomCamera (View view){
// mMap.moveCamera(CameraUpdateFactory.newLatLng(getLatLng()));
// mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
// mMap.getCameraPosition();
// CameraPosition.Builder camPos = new CameraPosition.Builder().target(getLatLng()).bearing(0);
//}
}
这是我的主要 xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/linearLayout3"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Mapa">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
android:visibility="visible"
app:layout_constraintBottom_toTopOf="@+id/map"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:title="@string/app_name" />
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/toolbar"
tools:context=".Mapa" />
</android.support.constraint.ConstraintLayout>
这是请求权限后第一次运行时 map 的显示方式:
最奇怪的是它以前可以用。然后我加了一些东西，它就坏了。我删除了使用 Android Studio 中的历史记录工具添加的这个东西，但它仍然损坏。
最佳答案
您好，尝试更改以下代码或方法，还有一件事是蓝屏不是 map 的问题，而是它显示在默认位置(意味着海洋中的任何位置):
//Verifica as permissões do aplicativo
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_ACCESS_FINE_LOCATION: {
// Coloca as permissões em ordem e checa se elas estão habilitadas.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (mMap!=null && checkPermissions()) {
mMap.setMyLocationEnabled(true);
}
//Se aplicativo não foi permitido depois de perguntar, o fecha
} else {
moveTaskToBack(true);
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
return;
}
}
}
关于java - 应用程序的 map 在请求权限后首次运行时保持空白，但在关闭并重新打开后可以正常工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53386439/