标记或折线未显示在谷歌地图中

Question

映射活动包com.example.user.pavai；

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
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.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
public class MapsActivity extends FragmentActivity implements 
OnMapReadyCallback {
private GoogleMap mMap;
private  String lat1;
private String long1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is 
ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) 
getSupportFragmentManager()
.findFragmentById(R.id.map);
Bundle route = getIntent().getExtras();
lat1 =route.getString("lat1");
long1 = route.getString("long1");
// Log.d("lat",lat1);
//Log.d("long",long1);
//Toast.makeText(MapsActivity.this,lat1,Toast.LENGTH_SHORT).show();
//Toast.makeText(MapsActivity.this,long1,Toast.LENGTH_SHORT).show();
}

/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the 
camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will 
be prompted to install
* it inside the SupportMapFragment. This method will only be triggered 
once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;


// Add a marker in Sydney and move the camera
LatLng ne = new 
LatLng(Double.parseDouble(lat1),Double.parseDouble(long1));
mMap.addMarker(new MarkerOptions().position(ne).title("Marker in 
Sample"));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new 
LatLng(Double.parseDouble(lat1),Double.parseDouble(long1)), 10));

//drawing route

Polyline disp = mMap.addPolyline(new 
PolylineOptions().clickable(true).add(
new LatLng(Float.parseFloat(lat1),Float.parseFloat(long1)),
new LatLng(13.118055,80.261054),
new LatLng(13.131398,80.237838),
new LatLng(13.146812,80.217019),
new LatLng(13.205292,80.196488)
));
}
}

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.user.pavai">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality. 
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".Login">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".User" >
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
</activity>
<!--
The API key for Google Maps-based APIs is defined as a string 
resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign 
the APK.
You need a different API key for each encryption key, including the 
release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in 
src/debug/ and src/release/. 
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
</intent-filter>

</activity>
</application>
</manifest>

我从以前的活动和解析中获得一个字符串值将其转换为双值并用于纬度和经度但在运行该应用程序时，没有地图和折线显示了我能做些什么来解决这个问题

但当我在其他应用程序中尝试相同的代码时，它起作用了，但我不知道为什么它不适用于这个

Answer 1

我得到了答案，我忘记添加getMapAsync方法