public class MainActivity extends AppCompatActivity {
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void show(View v){
if (hasActiveInternetConnection(context)){
Toast.makeText(MainActivity.this, "Internet connection available", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, "Internet connection not available", Toast.LENGTH_SHORT).show();
}
}
public boolean hasActiveInternetConnection(Context context) {
if (isNetworkAvailable(context)) {
new URLConnectTask().execute();
} else {
// Log.d(LOG_TAG, "No network available!");
Toast.makeText(MainActivity.this, "No network available!", Toast.LENGTH_SHORT).show();
}
return false;
}
private class URLConnectTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
String code = String.valueOf(urlc.getResponseCode() == 200);
return code;
} catch (IOException e) {
//Log.e(LOG_TAG, "Error checking internet connection", e);
//Toast.makeText(MainActivity.this, "Error checking internet connection", Toast.LENGTH_SHORT).show();
return "Error checking internet connection";
}
}
}
private boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null;
}
}
我将此post用于Internet连接检查。但是因为他们没有使用asynctask,所以如果我使用此代码,则会得到
NetworkOnMainThreadException
。我尝试使用asynctask,但现在仅收到消息“ Internet连接不可用”。我认为这是因为asynctask没有返回布尔值true。因此,任何帮助将不胜感激。 最佳答案
这项工作很好,您可以使用此代码
public boolean isConnectingToInternet(){
ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null)
{
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
return false;
}
//add to permission <uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />