我们正在使用Android Volley，并使用一个自认证的SSL，它可以正常工作。但现在我们想要实现Google Maps，但它不起作用；它只是显示一个灰色屏幕，没有任何错误提示。这是我们Volley的实现方式: 
。
地图活动（MapActivity）是由Android Studio创建的通用活动：
在activity_maps.xml中，
我们如何实现地图Activity呢？谢谢！
。public class AppSingleton {
private static AppSingleton mAppSingletonInstance;
private RequestQueue mRequestQueue;
private static Context mContext;
private AppSingleton(Context context) {
mContext = context;
mRequestQueue = getRequestQueue();
}
public static synchronized AppSingleton getInstance(Context context) {
if (mAppSingletonInstance == null) {
mAppSingletonInstance = new AppSingleton(context);
}
return mAppSingletonInstance;
}
private RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext(), new HurlStack(null, getSocketFactory()));
}
return mRequestQueue;
}
public <T> void addToRequestQueue(Request<T> req, String tag) {
req.setTag(tag);
getRequestQueue().add(req);
}
这是我们的getSocketFactory：
private SSLSocketFactory getSocketFactory() {
CertificateFactory cf = null;
try {
cf = CertificateFactory.getInstance("X.509");
InputStream caInput = mContext.getResources().openRawResource(OUR_CERT);
Certificate ca;
try {
ca = cf.generateCertificate(caInput);
Log.e("CERT", "ca=" + ((X509Certificate) ca).getSubjectDN());
} finally {
caInput.close();
}
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("ca", ca);
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
HostnameVerifier hostnameVerifier = new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
Log.e("CipherUsed", session.getCipherSuite());
return hostname.compareTo("OUR_SERVER_HOSTNAME")==0;
}
};
HttpsURLConnection.setDefaultHostnameVerifier(hostnameVerifier);
SSLContext context = null;
context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());
SSLSocketFactory sf = context.getSocketFactory();
return sf;
} catch (CertificateException | NoSuchAlgorithmException | KeyStoreException | IOException | KeyManagementException e) {
e.printStackTrace();
}
return null; }
地图活动（MapActivity）是由Android Studio创建的通用活动：
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps2);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}}
以及它的位置：
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="cat.amb.parcandride.MapsActivity" />
在activity_maps.xml中，
我们如何实现地图Activity呢？谢谢！