说明： 大家好，我正在尝试检查我的设备是否与互联网连接。我正在解释我所做的所有步骤。
步骤1：我创建了一个接收器类来检查连接状态何时发生变化。
Step-2：我还创建了一个接口，其中我有获取连接状态的方法（true / false）
步骤3：在我的Activity上实现此侦听器，然后覆盖侦听器方法。
步骤4：如果我的互联网已连接，请继续。如果我的互联网没有连接，我把你的互联网没有连接的消息。
步骤5：最后，我在AndroidManifest.xml文件中注册此接收器。
注意：以上所有步骤都正常工作，直到SDK_VERSION Marshmallow。当我用Nougt（7.0）检查它时，它不起作用。
接收机
监听
int channels = I.channels();
int nRows = I.rows;
int nCols = I.cols * channels;
if (I.isContinuous())
{
nCols *= nRows;
nRows = 1;
}
int i, j;
uchar* p;
for (i = 0; i < nRows; ++i)
{
p = I.ptr<uchar>(i);
for (j = 0; j < nCols; ++j)
{
I.at<uchar>(10, 10) = 255;
}
}
return I;
互联网连接状态方法
diff = ScanImageAndReduceC(diff);
namedWindow("Difference", WINDOW_AUTOSIZE);// Create a window for display.
imshow("Difference", diff); // Show our image inside it.
waitKey(0); // Wait for a keystroke in the window
return 0;
Manifest.xml中的权限和注册接收器
public class ConnectivityReceiver extends BroadcastReceiver {
public static ConnectivityReceiverListener connectivityReceiverListener;
public ConnectivityReceiver(){
super();
}
@Override
public void onReceive(Context context, Intent intent) {
if (connectivityReceiverListener != null) {
connectivityReceiverListener.onNetworkConnectionChanged(Utils.isInternetConnected(context));
}
}
public static boolean isConnected(Context context) {
if(Utils.isInternetConnected(context)){
return true;
}else{
return false;
}
}
}
以下方法是检查互联网连接
public interface ConnectivityReceiverListener {
void onNetworkConnectionChanged(boolean isConnected);
}
以下方法检查是否已连接
public static boolean isInternetConnected(final Context _context) {
ConnectivityManager cm = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (activeNetwork != null) {
if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
return true;
} else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
return true;
}
return true;
} else {
return false;
}
}
以下方法调用侦听器
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<receiver
android:name="com.durian.receivers.ConnectivityReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
这是我的Application类，它在android中注册了name参数
private boolean checkConnection() {
boolean isConnected = ConnectivityReceiver.isConnected(CustomerActivity.this);
showSnack(isConnected);
return isConnected;
}
注意：在 naught 操作系统版本之下，一切正常。但问题是，当我在 naught 中进行测试时，它无法正常工作。请提供适用于所有操作系统的正确解决方案。
供参考，您可以查看snapdeal应用程序
我想要与snapdeal Android应用程序完全一样。
答案 0 :(得分：0)
/**You can simply use below code Snippet**/
/**Below code Check 2 condition that Your device is connected to Wifi or Data - Connection or not. If yes then will also check that Internet is working or not..**/
/**ConnectivityReceiver Class**/
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.util.Log;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class ConnectivityReceiver
{
private static ConnectivityReceiver.AsyncResponse asyncResponse;
/************************************************ for checking internet connection*******/
public static boolean isNetworkAvailable(Context context)
{
ConnectivityManager connectivity = null;
boolean isNetworkAvail = false;
try
{
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;
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
if (connectivity != null)
{
connectivity = null;
}
}
return isNetworkAvail;
}
private static class ConnectionCheck extends AsyncTask<String,Void,Boolean>
{
@Override
protected Boolean doInBackground(String... params)
{
HttpURLConnection urlConnection = null;
try
{
if(params[0].endsWith("") || params[0] == null)
{
params[0] = "http://www.google.com/";
}
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
if (!url.getHost().equals(urlConnection.getURL().getHost()))
{
// we were redirected! Kick the user out to the browser to sign on?
return true;
}
}
catch (Exception e)
{
e.printStackTrace();
return false;
}
finally
{
urlConnection.disconnect();
}
return false;
}
@Override
protected void onPostExecute(Boolean aBoolean)
{
super.onPostExecute(aBoolean);
asyncResponse.processFinish(aBoolean);
}
}
public interface AsyncResponse
{
void processFinish(boolean output);
}
public static void speedTest(String url,ConnectivityReceiver.AsyncResponse asyncResponse)
{
ConnectivityReceiver.asyncResponse = asyncResponse;
new ConnectivityReceiver.ConnectionCheck().execute(url);
}
}
/**Code implementation in your class**/
String ConnectionCheck_Url = "http://www.google.com/";
if(ConnectivityReceiver.isNetworkAvailable(MainActivity.this))
{
ConnectivityReceiver.speedTest(ConnectionCheck_Url,new ConnectivityReceiver.AsyncResponse()
{
@Override
public void processFinish(boolean output)
{
if (output)
{
/* * If The output Value --->"True" Then Only
request will Execute
* NOTE: Here "True" Value Means Intenet is Working*/
// Implement your code here
}
else
{
//Please_Check_Your_Internet_Connection
}
}
});
}
else
{
// Please_Connect_to_your_Wifi_or_Data_Connection
}
}
/**Android MainifestFile.xml**/
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>