安卓谷歌地图v2不适用于移动互联网(3g或4g)，但它在wifi上工作

Question

我正在开发一个用于地理围栏的Android应用程序，它使用谷歌地图v2来加载地图。我面临的问题是，当使用3G或4G网络连接初始化地图时，我看到一个空白屏幕。一段时间后，应用程序在使用 WIFI 初始化时变得无响应，地图初始化没有任何延迟和任意次数。 我将嵌入下面的代码

GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
StrictMode.ThreadPolicy policy = new
StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
queue = Volley.newRequestQueue(getApplicationContext());
pref = getPreferences( Context.MODE_PRIVATE );
//db MANAGER
dbManager = new DBManager(this);
dbManager.open();
InitializeClient();
InitializeDB();

} catch (Exception e) {
e.printStackTrace();
}
mqtt=new MQTT();
try{
if(ip==null){
System.out.println("Mqtt Initialized in Maps Activity");
ip="demo.aiotm.in:1883";
}
//mqtt.setHost("tcp://"+ip);
mqtt.setHost("tcp://10.30.60.242:1883");
connection = mqtt.blockingConnection();
connection.connect();
}catch (Exception e){
e.printStackTrace();
}
}
private void InitializeClient() {
try {
if (mMap==null){
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//Initializing googleApiClient
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
googleApiClient.connect();
if (mMap==null){
Toast.makeText(getApplicationContext(),"Sorry Unable to create maps",Toast.LENGTH_SHORT).show();
}
}
}catch (Exception e){e.printStackTrace();}


if (this.mMap != null) {
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) {
// TODO: Consider calling
//    ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
//   public void onRequestPermissionsResult(int requestCode, String[] permissions,
//                                          int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}else {
System.out.println(":::::::::::::::::::::::::::::::::: Map Not Initialized :::::::::::::::::::::::::::::::::::::::::;");}
mMap.setMyLocationEnabled(true);

}
if (googleApiClient.isConnected()||googleApiClient.isConnecting()){System.out.println("------------------------------------>Api is connecting<-----------------------------------");}

}
@Override
protected void onResume() {
super.onResume();
InitializeClient();
getCurrentLocation();

}
@Override
protected void onPause() {
super.onPause();

}

我在清单文件中授予的权限

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature android:name="android.hardware.location.gps" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>

有没有人遇到过这样的问题？如果有解决方案，请与我分享！

Answer 1

我认为问题不在于地图初始化，似乎您正在这里的主线程上建立连接

mqtt = new MQTT();
try {
if (ip == null) {
System.out.println("Mqtt Initialized in Maps Activity");
ip = "demo.aiotm.in:1883";
}
//mqtt.setHost("tcp://"+ip);
mqtt.setHost("tcp://10.30.60.242:1883");
connection = mqtt.blockingConnection();
connection.connect();
} catch (Exception e) {
e.printStackTrace();
}

而且可能这个地址tcp://10.30.60.242:1883只能在您的内部wifi网络中访问，因此在通过移动数据连接进行测试时，呼叫超时