我有一个带有android 6.0的手机，并且onMapReady的方法没有执行，因为我认为需要运行时权限，我不知道该怎么做，这是我的代码
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, OnMapReadyCallback {
GoogleMap map;
GoogleApiClient mGoogleApiClient;
String email;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
FirebaseUser user= FirebaseAuth.getInstance().getCurrentUser();
//obtener datos para la barra
if(user != null) {
String nombre=user.getDisplayName();
email=user.getEmail();
Uri foto=user.getPhotoUrl();
NavigationView navigationsView = (NavigationView) findViewById(R.id.nav_view);
View hView = navigationsView.getHeaderView(0);
TextView nav_user = (TextView)hView.findViewById(R.id.txtMail);
TextView name=(TextView) hView.findViewById(R.id.txtNombre);
ImageView img_user = (ImageView)hView.findViewById(R.id.profile_image);
name.setText(nombre);
nav_user.setText(email);
Picasso.with(this).load(foto).into(img_user);
}
else {
SharedPreferences loginbdd=getSharedPreferences("login", Context.MODE_PRIVATE);
email=loginbdd.getString("nombre","");
String nombre=loginbdd.getString("mail","");
NavigationView navigationsView = (NavigationView) findViewById(R.id.nav_view);
View hView = navigationsView.getHeaderView(0);
TextView nav_user = (TextView)hView.findViewById(R.id.txtMail);
TextView name=(TextView) hView.findViewById(R.id.txtNombre);
ImageView img_user = (ImageView)hView.findViewById(R.id.profile_image);
nav_user.setText(email);
name.setText(nombre);
}
}
private void goLogin() {
Intent intent = new Intent(this, Login.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
new AlertDialog.Builder(MainActivity.this)
.setIcon(R.drawable.cerrar).setTitle("Cerrar Aplicación").setMessage("Deseas cerrar CicloMapp?")
.setCancelable(true).setPositiveButton("Si", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
System.exit(0);
}
})
.setNegativeButton("No", null).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
} else if (id == R.id.endSession) {
new AlertDialog.Builder(MainActivity.this)
.setIcon(R.drawable.cerrar)
.setTitle("Cerrar sessión")
.setMessage("Deseas cerrar sesión?")
.setCancelable(true)
.setPositiveButton("Si", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
FirebaseUser user=FirebaseAuth.getInstance().getCurrentUser();
if(user!= null){
LoginManager.getInstance().logOut();
FirebaseAuth.getInstance().signOut();
goLogin();
}else{
SharedPreferences loginbdd=getSharedPreferences("login", Context.MODE_PRIVATE);
SharedPreferences.Editor editor=loginbdd.edit();
editor.remove("inicio");
editor.commit();
goLogin();
}
}
})
.setNegativeButton("No", null).show();
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.AgregarRuta) {
} else if (id == R.id.ValorarRuta) {
Intent i = new Intent(MainActivity.this, Valoraraciones.class);
i.putExtra("correo", email);
startActivity(i);
} else if (id == R.id.ReportarRuta) {
Intent i = new Intent(MainActivity.this, Reportar.class);
i.putExtra("correos", email);
startActivity(i);
} else if (id == R.id.Eventos) {
} else if (id == R.id.Refresco) {
} else if (id == R.id.Leyes) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onMapReady(final GoogleMap googleMap) {
map=googleMap;
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
map.getUiSettings().setMapToolbarEnabled(false);
map.getUiSettings().setMyLocationButtonEnabled(true);
map.setMyLocationEnabled(true);
map.getUiSettings().setZoomControlsEnabled(true);
CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(-33.447487,-70.673676));
CameraUpdate zoom = CameraUpdateFactory.zoomTo(11);
map.moveCamera(center);
map.animateCamera(zoom);
Polyline po = new Polyline();
po.AddPolyline(map);
int height = 50;
int width = 50;
BitmapDrawable bitmapdraw = (BitmapDrawable) getResources().getDrawable(R.drawable.mruta);
Bitmap b = bitmapdraw.getBitmap();
Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);
final Marcadores ma=new Marcadores();
ma.MarcadoreBdd(map,smallMarker);
}
}
也许onmylocation需要权限ithink
ps：与android 4.4完美配合，问题在于android 6.0或更高版本
答案 0 :(得分：0)
在将我的应用程序升级到新的Android版本时，我也在努力使用运行时权限。
但我发现这篇文章非常有用：
https://inducesmile.com/android/android-6-marshmallow-runtime-permissions-request-example/ （以下代码来自于此。）
基本上，您需要在需要时检查您的应用程序中是否具有权限（可能在您的情况下启动时），并使用此代码;
if (ContextCompat.checkSelfPermission(WebActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(WebActivity.this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, MY_REQUEST_CODE);
}
然后，您需要在onRequestPermissionsResult方法中处理响应
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == MY_REQUEST_CODE) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//You have permission, so continue
}else if (grantResults[0] == PackageManager.PERMISSION_DENIED){
if (ActivityCompat.shouldShowRequestPermissionRationale(WebActivity.this, Manifest.permission.RECORD_AUDIO)) {
//Show an explanation to the user *asynchronously*
ActivityCompat.requestPermissions(WebActivity.this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, MY_REQUEST_CODE);
}else{
//Never ask again and handle your app without permission.
}
}
}
}
不要忘记您仍需要在MANIFEST文件中指定权限。