Question

我在Android设备上测试我的新应用程序时遇到此错误“没有互联网连接”虽然我有良好的网络连接，也有互联网窗口提示选择浏览器导航应用程序，我不需要此窗口出现

清单

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.elarabygroup"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />



    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".ElarabyGroup"
            android:label="@string/title_activity_elaraby_group" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
<!-- 
        <receiver
            android:name="com.google.android.gcm.GCMBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

                <category android:name=".ElarabyGroup" />
            </intent-filter>
        </receiver>

        <service android:name=".GCMIntentService" />
        -->
    </application>

</manifest>

活动

package com.example.elarabygroup;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebView;
import com.google.android.gcm.GCMRegistrar;

public class ElarabyGroup extends Activity {
    private String TAG;
    private String SENDER_ID = "222874571774";
    private WebView webView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_elaraby_group);
        /*
        GCMRegistrar.checkDevice(this);
        GCMRegistrar.checkManifest(this);

        final String regId = GCMRegistrar.getRegistrationId(this);
        if (regId.equals("")) {
            GCMRegistrar.register(this, SENDER_ID);
        } else {
            Log.v(TAG, "Already registered");
        }
*/
        try {

            ConnectivityManager con = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

            if (con.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED
                    || con.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED) {
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                // builder.setMessage(con.getActiveNetworkInfo().getState().toString());
                builder.setMessage("No Internet connection");
                AlertDialog alert = builder.create();
                alert.show();

            }

            else

            {

                webView = (WebView) findViewById(R.id.webView1);
                webView.getSettings().setJavaScriptEnabled(true);
                webView.loadUrl("http://google.com");
            }

        } catch (Exception e) {

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            // builder.setMessage(con.getActiveNetworkInfo().getState().toString());
            builder.setMessage(e.getMessage().toString());

            AlertDialog alert = builder.create();
            /* alert.show(); */

            // String url =
            // "http://beta.elarabygroup.com/bug?bug="+e.getMessage().toString();
            String url = "http://google.com/";
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setData(Uri.parse(url));
            startActivity(i);

        }

    }

}
/*
 * @Override public boolean onCreateOptionsMenu(Menu menu) {
 * getMenuInflater().inflate(R.menu.activity_elaraby_group, menu); return true;
 * } }
 */

Answer 1

首先，您需要获得许可才能知道设备是否已连接到网络。这需要在你的清单中，在元素中：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

然后

ConnectivityManager connec = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

if (connec != null && (connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED) ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)){ 
    //You are connected, do something online.
}else if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED ||  connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED ) {             
    //Not connected.        
    Toast.makeText(getApplicationContext(), "You must be connected to the internet", Toast.LENGTH_LONG).show();
}

getNetworkInfo（）中的1和0表示Wifi，3g / edge我忘记了哪个，但我知道这段代码检查正确。

Answer 2

问题在于以下条件：

 if (con.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED
                || con.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED) {

Android只允许您一次连接到一种类型的网络，默认情况下，只要屏幕打开，wifi就优先于移动数据。因此，如果你打开wifi，移动网络将自动断开连接，当wifi关闭时，它显然没有连接。

if语句的作用是“如果移动网络或wifi关闭，请显示错误对话框”。由于每次都会返回true，因此您遇到了问题。相反，请尝试使用：

 if (con.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED
                && con.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED) {

没有网络连接

2 个答案: