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如何检查 Android 中的互联网连接？

发布于 2024-08-22 18:26:51 字数 64 浏览 11 评论 0原文

我想检查每个活动中的互联网连接。如果丢失，应显示一条消息。

任何人都可以指导我如何实现这一目标吗？

原文

I want to check the internet connectivity in each activity. If it is lost a message should be displayed.

Can any one guide me how to achieve this?

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评论（8）

分開簡單 2024-08-29 18:26:51

任一点只能有一个连接处于活动状态。因此，一个更简单的答案是：

final ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected()) {
    // notify user you are online
} else {
    // notify user you are not online
}

它还适合任何新型网络，例如 ConnectivityManager#TYPE_WIMAX

还要确保您拥有监视网络状态所需的权限。您需要将此权限添加到 AndroidManifest.xml 中：

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

Only one connection can be active at any one point. So a simpler answer is:

final ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected()) {
    // notify user you are online
} else {
    // notify user you are not online
}

It also caters for any new type of network such as ConnectivityManager#TYPE_WIMAX

Also make sure that you have the required permission to monitor the network state. You need to add this permission to your AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
回复 原文
捶死心动 2024-08-29 18:26:51

您可以使用 ConnectivityManager 检查网络状态。

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

if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED ) {

    // notify user you are online

}
else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) {

    // notify user you are not online
}

请注意，常量 ConnectivityManager.TYPE_MOBILE 和 ConnectivityManager.TYPE_WIFI 表示连接类型，这两个值并不详尽。有关详尽列表，请参阅此处。

另请确保您拥有监控网络状态所需的权限。您需要将此权限添加到 AndroidManifest.xml 中：

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

You can use the ConnectivityManager to check the network state.

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

if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED ) {

    // notify user you are online

}
else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) {

    // notify user you are not online
}

Note that the constants ConnectivityManager.TYPE_MOBILE and ConnectivityManager.TYPE_WIFI represent connection types and these two values are not exhaustive. See here for an exhaustive list.

Also make sure that you have the required permission to monitor the network state. You need to add this permission to your AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
回复 原文
长不大的小祸害 2024-08-29 18:26:51

对于各种类型的网络状态都可以这样做

public void  checkNetworkStatus(){

    final ConnectivityManager connMgr = (ConnectivityManager)
     this.getSystemService(Context.CONNECTIVITY_SERVICE);

     final android.net.NetworkInfo wifi =
     connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

     final android.net.NetworkInfo mobile =
     connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

     if( wifi.isAvailable() ){

     Toast.makeText(this, "Wifi" , Toast.LENGTH_LONG).show();
     }
     else if( mobile.isAvailable() ){

     Toast.makeText(this, "Mobile 3G " , Toast.LENGTH_LONG).show();
     }
     else
     {

         Toast.makeText(this, "No Network " , Toast.LENGTH_LONG).show();
     }

}

You can do this, for various types of network status

public void  checkNetworkStatus(){

    final ConnectivityManager connMgr = (ConnectivityManager)
     this.getSystemService(Context.CONNECTIVITY_SERVICE);

     final android.net.NetworkInfo wifi =
     connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

     final android.net.NetworkInfo mobile =
     connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

     if( wifi.isAvailable() ){

     Toast.makeText(this, "Wifi" , Toast.LENGTH_LONG).show();
     }
     else if( mobile.isAvailable() ){

     Toast.makeText(this, "Mobile 3G " , Toast.LENGTH_LONG).show();
     }
     else
     {

         Toast.makeText(this, "No Network " , Toast.LENGTH_LONG).show();
     }

}
回复 原文
命硬 2024-08-29 18:26:51

来检查移动和 Wi-Fi 的网络覆盖和数据可用性

您可以直接通过查看网络覆盖可用性、

private boolean isNetworkAvailable()
{
 ConnectivityManager conxMgr = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);

 NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 NetworkInfo wifiNwInfo   = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

return ((mobileNwInfo== null ? false : mobileNwInfo.isAvailable()) || (wifiNwInfo == null ? false : wifiNwInfo.isAvailable()));

}

查看数据可用性（如果网络可用）

private boolean isDataAvailable()
{
  ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);

 NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 NetworkInfo wifiNwInfo   = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

return ((mobileNwInfo== null? false : mobileNwInfo.isConnected() )|| (wifiNwInfo == null? false : wifiNwInfo.isConnected()));
}

You can check network coverage and data availability of Mobile and wi-fi directly with

For Network coverage availability,

private boolean isNetworkAvailable()
{
 ConnectivityManager conxMgr = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);

 NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 NetworkInfo wifiNwInfo   = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

return ((mobileNwInfo== null ? false : mobileNwInfo.isAvailable()) || (wifiNwInfo == null ? false : wifiNwInfo.isAvailable()));

}

For Data availability if network available

private boolean isDataAvailable()
{
  ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);

 NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 NetworkInfo wifiNwInfo   = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

return ((mobileNwInfo== null? false : mobileNwInfo.isConnected() )|| (wifiNwInfo == null? false : wifiNwInfo.isConnected()));
}
回复 原文
意犹 2024-08-29 18:26:51

修正

if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
    ||  conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING  ) {
   //notify user you are online
}

应该是

if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
    ||  conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) {
    //notify user you are online
}

Correction

if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
    ||  conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING  ) {
   //notify user you are online
}

should be

if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
    ||  conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) {
    //notify user you are online
}
回复 原文
风轻花落早 2024-08-29 18:26:51

注册广播接收器来处理CONNECTIVITY_ACTION。请参阅此完整内容示例。您应该更新一个静态变量“connectionAvailable”，该变量每次都可以通过其各自的 getter 进行访问。

请记住在 ma​​nifest 文件中声明广播接收器：

<receiver android:name=".NetworkConnectivityReceiver" android:enabled="true">
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
    </intent-filter>
</receiver>

关于“签入每个活动”的问题，您可能有兴趣使用由您的活动扩展的 BaseActivity管理连接测试并显示消息。

另请注意，使用事件（而不是从活动轮询）会更加高效。

Register a broadcast receiver to handle CONNECTIVITY_ACTION. See this full example. You should update a static variable 'connectionAvailable' that will be accessible everywhere and everytime through its respective getter.

Remember to declare the broadcast receiver in the manifest file:

<receiver android:name=".NetworkConnectivityReceiver" android:enabled="true">
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
    </intent-filter>
</receiver>

On the matter of 'checking in each activity', may be you would be interested in using a BaseActivity extended by your activities and managing the test of connectivity and displaying the message.

Also, note that using events (not polling from activities) will be more efficient.

回复 原文
只为一人 2024-08-29 18:26:51

您没有正确使用 ConnectivityManager.getNetworkInfo(0).getState() 和 ConnectivityManager.getNetworkInfo(1).getState()，而不是硬编码值 (1) 和(0) 使用 ConnectivityManager.TYPE_WIFI 和 ConnectivityManager.TYPE_MOBILE

You are not using ConnectivityManager.getNetworkInfo(0).getState() and ConnectivityManager.getNetworkInfo(1).getState() properly, instead of hardcoding the values (1) and (0) use ConnectivityManager.TYPE_WIFI and ConnectivityManager.TYPE_MOBILE

回复 原文
荆棘i 2024-08-29 18:26:51

这是一个布尔检查，用于查看您是否具有网络访问权限。它不会确定哪种网络访问 - 移动、wifi...，它只是检查您是否在线。

boolean mobileNwInfo = false;  
ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);  
try { mobileNwInfo = conxMgr.getActiveNetworkInfo().isConnected(); }  
catch (NullPointerException e) { mobileNwInfo = false; }  
if ( mobileNwInfo == false ) {
  // Your code goes here...
}

This is a boolean check to see if you have network access. It doesn't determine what kind of network access - mobile, wifi..., it just checks to see if you're online.

boolean mobileNwInfo = false;  
ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);  
try { mobileNwInfo = conxMgr.getActiveNetworkInfo().isConnected(); }  
catch (NullPointerException e) { mobileNwInfo = false; }  
if ( mobileNwInfo == false ) {
  // Your code goes here...
}
回复 原文
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