【Android】利用廣播BroadCast監聽網絡的變化

package com.app.test02;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo.State;
import android.widget.Toast;
/**
 * Android  利用廣播BroadCast監聽網絡的變化
 * @author 402-9
 *
 */
public class BroadCastDemo extends BroadcastReceiver{
    State wifiState = null;
    State mobileState = null;
    public static final String ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if (ACTION.equals(intent.getAction())) {
            //獲取手機的連接服務管理器，這裏是連接管理器類
            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            wifiState = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
            mobileState = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();

            Intent intent2 = new Intent(context , BroadCastActivity2_SMS.class);
            if (wifiState != null && mobileState != null && State.CONNECTED != wifiState && State.CONNECTED == mobileState) {
                context.startService(intent2);
                Toast.makeText(context, "手機網絡連接成功！", Toast.LENGTH_SHORT).show();
            } else if (wifiState != null && mobileState != null && State.CONNECTED == wifiState && State.CONNECTED != mobileState) {
                context.startService(intent2);
                Toast.makeText(context, "無線網絡連接成功！", Toast.LENGTH_SHORT).show();
            } else if (wifiState != null && mobileState != null && State.CONNECTED != wifiState && State.CONNECTED != mobileState) {
                context.startService(intent2);
                Toast.makeText(context, "手機沒有任何網絡...", Toast.LENGTH_SHORT).show();
            }
        }
    }

}

增加權限

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

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

效果圖