ネットワークの接続・切断を検知して処理を行う

ConnectivityReceiver.java

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

public class ConnectivityReceiver extends BroadcastReceiver {

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

    private final String TAG = getClass().getSimpleName();

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

        Log.e(TAG, "ConnectivityReceiver#onReceive()");

        ConnectivityManager connectivityManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

        if (networkInfo == null) {
            // 切断時の処理
            return;
        }

        Log.e(TAG, "NetworkInfo#isConnected() : " + networkInfo.isConnected());

        if (networkInfo.isConnected()) {
            // 接続時の処理
        }
    }

}