问题
I have a problem with checking internet connection in android at runtime. I use some different methods to check internet connection but i don't know which one is better . because each of them have some problems .
Method 1 check internet connection by pinging Google :
Runtime runtime = Runtime.getRuntime();
try {
Process mIpAddressProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
int mExitValue = mIpAddressProcess.waitFor();
return mExitValue == 0;
} catch (InterruptedException | IOException ignore) {
ignore.printStackTrace();
}
Method 2 check internet connection by ConnectivityManager :
public boolean checkNetwork() {
ConnectivityManager internetManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = internetManager.getActiveNetworkInfo();
return (networkInfo != null && networkInfo.isConnected() && networkInfo.isAvailable() && networkInfo.isConnectedOrConnecting());
}
I use method 1 inside an async task, but it doesn't work correctly sometimes and slow down the app, and Method 2 (ConnectivityManager) doesn't check internet connection , it checks only network connection !
回答1:
I'm using broadcast to check the connection every time. Create a class for connection info.
import android.content.Context;
import android.content.ContextWrapper;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class ConnectivityStatus extends ContextWrapper{
public ConnectivityStatus(Context base) {
super(base);
}
public static boolean isConnected(Context context){
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo connection = manager.getActiveNetworkInfo();
if (connection != null && connection.isConnectedOrConnecting()){
return true;
}
return false;
}
}
Apply code into your Activity:
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if(!ConnectivityStatus.isConnected(getContext())){
// no connection
}else {
// connected
}
}
};
Register broadcast in your activity's onCreate() method:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
your_activity_context.registerReceiver(receiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
..
...
....
}
Don't forget to unregistered/register on Activity cycle:
@Override
protected void onResume() {
super.onResume();
your_activity_context.registerReceiver(receiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
@Override
protected void onPause() {
super.onPause();
your_activity_context.unregisterReceiver(receiver);
}
回答2:
You can use below code to check whether network connection is available or not.
public class NetworkConnection {
public Context context;
public NetworkConnection(Context applicationContext) {
this.context=applicationContext;
}
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
}
public class MainActivity extends AppCompatActivity {
NetworkConnection nt_check;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
nt_check=new NetworkConnection(context);
if(nt_check.isOnline()) {
// do logic
} else {
// show message network is not available.
}
}
}
回答3:
Just check this LINK Here is the answer for both Connection & Internet.
回答4:
You can do it like this
uses-permission android:name="android.permission.INTERNET"
uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"
private boolean checkInternet(Context context) {
// get Connectivity Manager object to check connection
ConnectivityManager connec
=(ConnectivityManager)context.getSystemService(context.CONNECTIVITY_SERVICE);
// Check for network connections
if ( connec.getNetworkInfo(0).getState() ==
android.net.NetworkInfo.State.CONNECTED ||
connec.getNetworkInfo(0).getState() ==
android.net.NetworkInfo.State.CONNECTING ||
connec.getNetworkInfo(1).getState() ==
android.net.NetworkInfo.State.CONNECTING ||
connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTED ) {
Toast.makeText(context, " Connected ", Toast.LENGTH_LONG).show();
return true;
}else if (
connec.getNetworkInfo(0).getState() ==
android.net.NetworkInfo.State.DISCONNECTED ||
connec.getNetworkInfo(1).getState() ==
android.net.NetworkInfo.State.DISCONNECTED ) {
Toast.makeText(context, " Not Connected ", Toast.LENGTH_LONG).show();
return false;
}
return false;
}
回答5:
public static boolean isNetworkAvailable(Context context) {
try {
ConnectivityManager connManager = (ConnectivityManager) context.getSystemService
(Context.CONNECTIVITY_SERVICE);
if (connManager.getActiveNetworkInfo() != null && connManager.getActiveNetworkInfo()
.isAvailable() && connManager.getActiveNetworkInfo().isConnected()) {
return true;
}
} catch (Exception ex) {
ex.printStackTrace();
return false;
}
return false;
}
then just call this function from your fragment or Activity will work
回答6:
To check if internet connection is available or not, you can use the below code snippet
public static boolean hasActiveInternetConnection(Context context) {
if (isNetworkAvailable(context)) {
try {
HttpURLConnection urlc = (HttpURLConnection)
(new URL("http://clients3.google.com/generate_204")
.openConnection());
urlc.setRequestProperty("User-Agent", "Android");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
return (urlc.getResponseCode() == 204 && urlc.getContentLength() == 0);
} catch (IOException e) {
Log.e(LOG_TAG, "Error checking internet connection", e);
}
} else {
Log.d(LOG_TAG, "No network available!");
}
return false;
}
This code snippet will also help you to identify whether you device is having internet connection even if you are connected through wifi network.
Note: make sure to call this method in background thread ,because this can take time depending on your network speed, and should not be called in Main thread
回答7:
This is what i try in android to check internet connection it is not sleek solution but does the work given you have already checked for the network :
try {
HttpURLConnection urlConnection = (HttpURLConnection)
(new URL("http://clients3.google.com/generate_204")
.openConnection());
urlConnection.setRequestProperty("User-Agent", "Android");
urlConnection.setRequestProperty("Connection", "close");
urlConnection.setConnectTimeout(1500);
urlConnection.connect();
if (urlConnection.getResponseCode() == 204 &&
urlConnection.getContentLength() == 0) {
Log.d("Network Checker", "Successfully connected to internet");
return true;
}
} catch (IOException e) {
Log.e("Network Checker", "Error checking internet connection", e);
}
It's accurate for me.Try and let me know if you find any other good solution.
来源：https://stackoverflow.com/questions/41545504/check-internet-connection-in-android-not-network-connection