判斷網絡

//一定要加權限

android.permission.ACCESS_NETWORK_STATE

package com.bawei.network.utils;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetWorkUtils {
//判斷網絡是否連接
public static boolean isNetWorkAvailable(Context context) {
//網絡連接管理器
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
//網絡信息
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info != null) {
return true;
}
return false;
}

//判斷是否是wifi
public static boolean isWifi(Context context) {
    //網絡連接管理器
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    //網絡信息
    NetworkInfo info = connectivityManager.getActiveNetworkInfo();
    if (info != null && info.getType() == connectivityManager.TYPE_WIFI) {
        return true;
    }
    return false;
}
//判斷是否是手機流量
public static boolean isMobile(Context context) {
    //網絡連接管理器
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    //網絡信息
    NetworkInfo info = connectivityManager.getActiveNetworkInfo();
    if (info != null && info.getType() == connectivityManager.TYPE_MOBILE) {
        return true;
    }
    return false;
}

}

//在activity和fragment 判斷wifi
boolean available = NetWorkUtils.isNetWorkAvailable(this);
if (available) {
Toast.makeText(MainActivity.this, “網絡連接成功”, Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, “網絡連接失敗”, Toast.LENGTH_SHORT).show();