检查 INTENT 互联网连接

Question

是否有 Android Intent ACTION_XXX 在 Internet 连接可用时通知我？

我想实例化一个BroadcastReceiver，当用户启用 Internet 连接（通过 wifi、GSM 等）时通知我的应用程序

谁能帮帮我？

Answer 1

<receiver android:name=".YOURRECEIVER">
   <intent-filter>
      <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
   </intent-filter>
</receiver>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 2

接受的答案是正确的。我只添加 Receiver 代码来完成：

public class NetworkStateReceiver extends BroadcastReceiver {
    public void onReceive(Context context, Intent intent) {
     Log.d("app","Network connectivity change");
     if(intent.getExtras()!=null) {
        NetworkInfo ni=(NetworkInfo) intent.getExtras().get(ConnectivityManager.EXTRA_NETWORK_INFO);
        if(ni!=null && ni.getState()==NetworkInfo.State.CONNECTED) {
            Log.i("app","Network "+ni.getTypeName()+" connected");
        } else if(intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY,Boolean.FALSE)) {
            Log.d("app","There's no network connectivity");
        }
   }
}

Answer 3

更新到@lujop 答案：

public class NetworkStateReceiver extends BroadcastReceiver {
    private static final String TAG = "NetworkStateReceiver";

    @Override
    public void onReceive(final Context context, final Intent intent) {

        Log.d(TAG, "Network connectivity change");

        if (intent.getExtras() != null) {
            final ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
            final NetworkInfo ni = connectivityManager.getActiveNetworkInfo();

            if (ni != null && ni.isConnectedOrConnecting()) {
                Log.i(TAG, "Network " + ni.getTypeName() + " connected");
            } else if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, Boolean.FALSE)) {
                Log.d(TAG, "There's no network connectivity");
            }
        }
    }
}

Answer 4

MyReceiver.java

public class MyReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {

        if(isConnected(context)) Toast.makeText(context, "Connected.", Toast.LENGTH_LONG).show();
        else Toast.makeText(context, "Lost connect.", Toast.LENGTH_LONG).show();
    }

    public boolean isConnected(Context context) {
        ConnectivityManager cm =
                (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        boolean isConnected = activeNetwork != null &&
                              activeNetwork.isConnected();
        return isConnected;
    }
}

AndroidManifest.xml

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

更新

如果您的应用以 API 级别 26 或更高级别为目标，则您无法使用 清单以声明隐式广播的接收器（广播 不专门针对您的应用程序），除了一些隐含的 不受该限制的广播。在大多数情况下，您 可以改为使用计划作业。

用法 connection = MyReceiver()

// onCreate - onDestroy, onResume - onPause depends on you
override fun onStart() {
    super.onStart()
    registerReceiver(connection, IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION))
  }

override fun onStop() {
    super.onStop()
    // remember unregister to avoid leak
    unregisterReceiver(connection)
  }

更新 2

CONNECTIVITY_ACTION 此常量在 API 级别 28 中已弃用。 应用程序应该使用更通用的requestNetwork(NetworkRequest, PendingIntent)、registerNetworkCallback(NetworkRequest, PendingIntent) 或registerDefaultNetworkCallback(ConnectivityManager.NetworkCallback) 函数来更快、更详细地更新他们关心的网络变化。

因为它added in API level 22，所以上面的代码在所有版本的android上都可以正常工作

Answer 5

所有答案中缺少的部分是提醒您注册该操作：

IntentFilter filter = new IntentFilter();
filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
registerReceiver(your_receiver, filter);

Answer 6

我每次都使用广播来检查连接。为连接信息创建一个类。

import android.content.Context;
import android.content.ContextWrapper;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;


public class ConnectivityStatus extends ContextWrapper{

    public ConnectivityStatus(Context base) {
        super(base);
    }

    public static boolean isConnected(Context context){

        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo connection = manager.getActiveNetworkInfo();
        if (connection != null && connection.isConnectedOrConnecting()){
            return true;
        }
        return false;
    }
}

将代码应用到您的活动中：

 private BroadcastReceiver receiver = new BroadcastReceiver() {
 @Override
 public void onReceive(Context context, Intent intent) {
        if(!ConnectivityStatus.isConnected(getContext())){
            // no connection
        }else {
            // connected
        }
    }
 };

在您的活动的onCreate() 方法中注册广播：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_layout);
    your_activity_context.registerReceiver(receiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    ..
    ...
    ....
  }

不要忘记在活动周期取消注册/注册：

@Override
protected void onResume() {
    super.onResume();
    your_activity_context.registerReceiver(receiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));

}

@Override
protected void onPause() {
    super.onPause();
    your_activity_context.unregisterReceiver(receiver);

}

Answer 7

此代码将工作（在所有版本中），因为清单注册不适用于 7+（API 25 及更高版本） 设备请参阅此@987654321 @。

private void foo(){
    registerReceiver(connectionBroadcastReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}

private BroadcastReceiver connectionBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent == null || intent.getExtras() == null)
           return;

        ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.getState() == NetworkInfo.State.CONNECTED) {  
            // connected
        } 
    }
};

Answer 8

继续喵喵的回答

您可以通过以下方式启用/禁用接收器：

启用

 ComponentName receiver = new ComponentName(MainActivity.this, MyReceiver.class);
       PackageManager pm = this.getPackageManager();
       pm.setComponentEnabledSetting(receiver,
               PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
               PackageManager.DONT_KILL_APP);
       Toast.makeText(this, "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();
   }

禁用

ComponentName receiver = new ComponentName(MainActivity.this, MyReceiver.class);
       PackageManager pm = this.getPackageManager();
       pm.setComponentEnabledSetting(receiver,
               PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
               PackageManager.DONT_KILL_APP);
       Toast.makeText(this, "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();
   }

其中，同样可以在 Intent 或 onCreate 中调用

Answer 9

NetworkInfo.isConnected() 是测试互联网状态的不可靠方法，当有网络连接时它会返回 true，即使它可能无法访问互联网（例如没有互联网的 wifi）。更可靠的方法是使用 ping 和 CONNECTIVITY_ACTION BroadcastReceiver：

private void registerInternetReceiver()
{
    if (this.internetReceiver != null) return;
    this.internetReceiver = new BroadcastReceiver()
    {
        @Override
        public void onReceive (Context context, Intent intent)
        {
            if (isInternetAvailable()) Log.i ("Tag", "internet status online");
            else Log.i ("Tag", "internet status offline");
        }
    };
    IntentFilter filter = new IntentFilter();
    filter.addAction (ConnectivityManager.CONNECTIVITY_ACTION);
    registerReceiver (internetReceiver, filter);
}

private boolean isInternetAvailable()
{
    try
    {
        return (Runtime.getRuntime().exec ("ping -c 1 google.com").waitFor() == 0);
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
    }
    return false;
}

Answer 10

**Also worked on above Android 7.0**

// AndroidManifest.xml

 <service
            android:name=".NetworkSchedulerService"
            android:exported="true"
            android:permission="android.permission.BIND_JOB_SERVICE"/>


// MyApplication.java           

import  android.app.Application;
import android.app.job.JobInfo;
import android.app.job.JobScheduler;
import android.content.ComponentName;
import android.content.Context;
public class MyApplication extends Application {

    private static Context context;

    public static Context getContext() {
        return context;
    }

    public static final String TAG = MyApplication.class.getSimpleName();

    private static MyApplication mInstance;


    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();
        mInstance = this;
        scheduleJob();
    }

    public static synchronized MyApplication getInstance() {
        return mInstance;
    }

    private void scheduleJob()
    {
        JobInfo myJob = new JobInfo.Builder(0, new ComponentName(this, NetworkSchedulerService.class))
                .setRequiresCharging(true)
                .setMinimumLatency(1000)
                .setOverrideDeadline(2000)
                .setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)
                .setPersisted(true)
                .build();

        JobScheduler jobScheduler = (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);
        assert jobScheduler != null;
        jobScheduler.schedule(myJob);
    }
}   


// Constants.java   

public class Constants {
    public static final String CONNECT_TO_WIFI = "WIFI";
    public static final String CONNECT_TO_MOBILE = "MOBILE";
    public static final String NOT_CONNECT = "NOT_CONNECT";
    public final static String CONNECTIVITY_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
}


// LiveConnectivityReceiver.java    

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class LiveConnectivityReceiver extends BroadcastReceiver {

    private MConnectivityReceiver mConnectivityReceiver;
    LiveConnectivityReceiver(MConnectivityReceiver listener) {
        mConnectivityReceiver = listener;
    }


    @Override
    public void onReceive(Context context, Intent intent) {
        mConnectivityReceiver.onNetworkConnectionChanged(isConnected(context));

    }

    public static boolean isConnected(Context context) {
        ConnectivityManager cm = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
        assert cm != null;
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        return activeNetwork != null && activeNetwork.isConnectedOrConnecting();
    }

    public interface MConnectivityReceiver {
        void onNetworkConnectionChanged(boolean isConnected);
    }
}   


// MainActivity.java    

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private BroadcastReceiver mReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    @Override
    protected void onStop() {
        stopService(new Intent(this, NetworkSchedulerService.class));
        super.onStop();
    }

    @Override
    protected void onStart() {
        super.onStart();
        startService( new Intent(this, NetworkSchedulerService.class));
    }


    @Override
    protected void onPause() {
        super.onPause();
        this.unregisterReceiver(this.mReceiver);
    }

    @Override
    protected void onResume() {
        super.onResume();
        IntentFilter intentFilter = new IntentFilter("android.intent.action.MAIN");
        mReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                boolean isConnection = intent.getBooleanExtra("VALUE", false);
                if (!isConnection) {
                    Toast.makeText(context, "No Internet Connection", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(context, "Back to online", Toast.LENGTH_SHORT).show();
                }
            }
        };
        this.registerReceiver(mReceiver, intentFilter);
    }
}   


// NetworkSchedulerService.java 


import android.app.job.JobParameters;
import android.app.job.JobService;
import android.content.Intent;
import android.content.IntentFilter;

public class NetworkSchedulerService extends JobService implements LiveConnectivityReceiver.ConnectivityReceiverListener 
{

    private LiveConnectivityReceiver mLiveConnectivityReceiver;

    @Override
    public void onCreate()
    {
        super.onCreate();
        mLiveConnectivityReceiver = new LiveConnectivityReceiver(this);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_NOT_STICKY;
    }

    @Override
    public boolean onStartJob(JobParameters params) {
        registerReceiver(mLiveConnectivityReceiver, new IntentFilter(Constants.CONNECTIVITY_ACTION));
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters params) {
        unregisterReceiver(mLiveConnectivityReceiver);
        return true;
    }

    @Override
    public void onNetworkConnectionChanged(boolean isConnected)
    {
        Intent broadcastedIntent=new Intent("android.intent.action.MAIN");
        broadcastedIntent.putExtra("VALUE", isConnected);
        sendBroadcast(broadcastedIntent);
    }
}

Answer 11

从 Android 7++ 开始，@fedj 的回答将不起作用，但您可以通过编程方式注册广播接收器。

面向 Android 7.0（API 级别 24）及更高版本的应用无法接收 如果他们声明广播接收器，则 CONNECTIVITY_ACTION 广播 在他们的清单中。应用仍会收到 CONNECTIVITY_ACTION 广播，如果他们注册他们的广播接收器 Context.registerReceiver() 并且该上下文仍然有效。

Answer 12

我会阅读为 nougat + 更新的文档，因为由于设备数量不推荐使用意图，仅网络信息是不够的。我会在那里使用连接管理器（连接操作，添加变量）命令和变量，因为仅去年一年就发生了大多数变化，并且为了测试，启用单元数据始终处于活动状态，详细日志记录和积极切换，如果需要，使用 wlan 过滤器：

https://developer.android.com/reference/android/net/ConnectivityManager.html#CONNECTIVITY_ACTION

Answer 13

**你可以把这行代码放在Helper Methods上，当你想检查互联网连接时调用它**

public static class InternetState {
    static ConnectivityManager cm;

    static public boolean isConnected(Context context) {
        try {
            cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        } catch (NullPointerException e) {

        }

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
        return isConnected;
    }
}