Android 判断是否有网及无网处理

当我们开发时，为了提高用户的体验，常常要监测手机的网络状态，当手机处于无网状态时，我们会做一些相应的处理或者引导用户去打开网路，以下是我总结的一些经验，不足之处，还请谅解，如果有错误的地方，欢迎拍砖.（做了快两年的Android了，总觉得要做点什么，要不然感觉自己都在虚度了）

首先我们得自定义一个NetStateReceiver 继承extends  BroadcastReceiver

public class NetStateReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        boolean isNet = NetworkUtil.isConnected();
        if (isNet) {
            EventBus.getDefault().post(0, ConstantValue.Net_open);
        }else
            EventBus.getDefault().post(1, ConstantValue.Net_open);
    }
}

这里我用的是org.simple.eventbus.EventBus 框架来更新事件，如果大家不熟悉可以使用广播，或者其他自己熟悉的方式：0代表现在网络是打开的，1代表没打开

当然我们还得在配置文件里面单独注册：
   
       
           
               
           
       

当然这里还需注册网络操作权限：


 
 
 
 
 

当监测到没网时，我们可能需要引导用户去打开网络：

/*
    * 打开设置网络界面
    * */
    public static void setNetworkMethod(final Context context){
        //提示对话框
        AlertDialog.Builder builder=new AlertDialog.Builder(context);
        builder.setTitle("网络设置提示").setMessage("网络连接不可用,是否进行设置?").setPositiveButton("设置", new DialogInterface.OnClickListener() {


            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Intent intent=null;
                //判断手机系统的版本  即API大于10 就是3.0或以上版本
                if(android.os.Build.VERSION.SDK_INT>10){
                    intent = new Intent(android.provider.Settings.ACTION_SETTINGS);
                }else{
                    intent=new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
//                    intent = new Intent();
//                    ComponentName component = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");
//                    intent.setComponent(component);
//                    intent.setAction("android.intent.action.VIEW");
                }
                context.startActivity(intent);
            }
        }).setNegativeButton("取消", new DialogInterface.OnClickListener() {


            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                dialog.dismiss();
            }
        }).show();
    }

当然一般我们打开一个activity的时候，可能首先会去监测是否有网：

boolean isNet = NetworkUtil.isConnected();
if (!isNet) {
    NetworkUtil.getInstance().setNetworkMethod(this);
}

以下是NetworkUtil代码：

package com.jxhdc.aspire.jxhdcandroid.common.utils;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import com.jxhdc.aspire.jxhdcandroid.JXHDCApplication;

import org.simple.eventbus.EventBus;

/**
 * 网络工具类
 * Created by chenziqiang on 16/4/21.
 */
public class NetworkUtil {
    private volatile static  NetworkUtil instance;

    public NetworkUtil(){
        instance=this;
    }
    public synchronized static NetworkUtil getInstance() {
        if (instance == null) {
            synchronized (NetworkUtil.class) {
                instance = instance == null ? new NetworkUtil() : instance;
            }
        }
        return instance;
    }

    public static boolean isConnected() {
        Context context = JXHDCApplication.getContext();
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeInfo = manager.getActiveNetworkInfo();
        if (activeInfo != null) {
            return activeInfo.isConnected();
        }
        return false;
    }
//    public static boolean isNetConnected() {
//        ConnectivityManager cm = (ConnectivityManager) JXHDCApplication.getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
//        NetworkInfo info = cm != null ? cm.getActiveNetworkInfo() : null;
//        return info != null && info.isConnected();
//    }

    public static boolean isWifiConnected() {
        boolean isConnected = false;
        try {
            ConnectivityManager cm = (ConnectivityManager) JXHDCApplication.getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo info = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            isConnected = info.isConnected();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return isConnected;
    }

    public static boolean isMobileConnected() {
        boolean isConnected = false;
        try {
            ConnectivityManager cm = (ConnectivityManager) JXHDCApplication.getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo info = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            isConnected = info.isConnected();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return isConnected;
    }

    /*
    * 打开设置网络界面
    * */
    AlertDialog.Builder builder=null;
    public void setNetworkMethod(final Context context){
        if (builder!=null){
            builder.setCancelable(true);
        }
        //提示对话框
        builder=new AlertDialog.Builder(context);
        builder.setTitle("网络设置提示").setMessage("网络连接不可用,是否进行设置?").setPositiveButton("设置", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Intent intent=null;
                //判断手机系统的版本  即API大于10 就是3.0或以上版本
                if(android.os.Build.VERSION.SDK_INT>10){
                    intent = new Intent(android.provider.Settings.ACTION_SETTINGS);
                }else{
                    intent=new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
//                    intent = new Intent();
//                    ComponentName component = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");
//                    intent.setComponent(component);
//                    intent.setAction("android.intent.action.VIEW");
                }
                context.startActivity(intent);
            }
        }).setNegativeButton("取消", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                dialog.dismiss();
            }
        }).show();
    }
    /**
     * 网络异常提示界面

     */
    public  void setNetworkAnomaly(final Context context){
        //提示对话框
        AlertDialog.Builder builder=new AlertDialog.Builder(context);
        builder.setTitle("网络异常提示").setMessage("网络连接异常，请再试一次?").setPositiveButton("是", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                EventBus.getDefault().post("0","request_data");
            }
        }).setNegativeButton("取消", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                dialog.dismiss();
            }
        }).show();
    }
}