[英]Why is my android app not responding when there is no internet connection?
我的应用程序从互联网加载网页。 如果没有互联网连接,它应该在Web视图中显示一条消息,即将再次连接到互联网,然后尝试连接。 但是当我测试我的应用程序时,直到它具有互联网连接,它才会显示ui。 如何解决?
public class ma extends Fragment {
String dag = "1";
public WebView webViewma;
@Override
@Nullable
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
int SDK_INT = android.os.Build.VERSION.SDK_INT;
if (SDK_INT > 8) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
View v = inflater.inflate(R.layout.ma, container, false);
webViewma = (WebView) v.findViewById(R.id.webViewma);
LaadRooster();
return v;
}
public void LaadRooster() {
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://foo.com/foo.php");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(3);
nameValuePairs.add(new BasicNameValuePair("dag", dag));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
String ret = EntityUtils.toString(response.getEntity());
if (ret.startsWith("<!DOCTYPE html>")) {
webViewma.loadData(ret, "text/html", null);
} else {
webViewma.loadData("No connection, trying again...", "text/html", null);
LaadRooster();
}
} catch (IOException e) {
webViewma.loadData("No connection, trying again...", "text/html", null);
LaadRooster();
}
}
}
您正在通过在主线程上执行HTTP请求来锁定UI。 这需要移到后台线程。
另外,通过以下方式检查设备是否已连接到互联网可能会更容易:
public static boolean isConnected(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] allNetworks = cm.getAllNetworkInfo();
for (NetworkInfo networkInfo : allNetworks) {
if (networkInfo.isAvailable() && networkInfo.isConnected()) {
return true;
}
}
return false;
}
并在清单中:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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