使用EventBus在Activity与BroadcastReceiver之间进行通信

判断网络连接状况:

activity中的代码  ：ConnectivityManager   网络连接管理类    BroadcastReceiver 抽象类，实现其中的抽象方法。Service也是抽象类 记得实现其中的抽象方法

package com.lantu.tuhuadmin.netbroadcast;

import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import de.greenrobot.event.EventBus;
/**
 * 网络监听广播
 */
public class MainActivity extends AppCompatActivity {

    private NetReceiver mReceiver;

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

        IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
        mReceiver = new NetReceiver();
        //注册一个广播接收者
        registerReceiver(mReceiver, filter);

        //虽然他注册了广播接收者，但是他并没有进行处理
        EventBus.getDefault().register(this);
    }

    public void onEvent(NetEvent netEvent) {
        int state = netEvent.getState();
        if (state == 1) {
            //说明有网络连接
            Toast.makeText(MainActivity.this, "网络连接正常", Toast.LENGTH_LONG).show();
        }
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        //取消
        unregisterReceiver(mReceiver);
    }


}

自定义广播接收者里面的代码：

package com.lantu.tuhuadmin.netbroadcast;

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

import de.greenrobot.event.EventBus;

/**
 * Created on 2016/7/13.
 * Author:XXX
 * Description:网络广播监听
 */
public class NetReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        //获取网络连接管理器
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager != null) {
            //获取网络联系信息
            NetworkInfo mobWorkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);   //手机流量连接
            NetworkInfo wifiNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);     //Wifi连接

            if ((mobWorkInfo != null && mobWorkInfo.isConnected()) || (wifiNetInfo != null && wifiNetInfo.isConnected())) {
                //说明有网络连接   1表示有网络连接  2 表示没有网络连接
                int state = (mobWorkInfo != null && mobWorkInfo.isConnected()) || (wifiNetInfo != null && wifiNetInfo.isConnected()) ? 1 : 2;
                EventBus.getDefault().post(new NetEvent(state, "网络已连接"));
            } else {
                //没有网络不进行处理
            }
        }
    }
}

添加网络权限和 自定义事件类型，接收的是自定义广播

package com.lantu.tuhuadmin.netbroadcast;

/**
 * Created on 2016/7/13.
 * Author:XXX
 * Description:XXX
 */
public class NetEvent {
    private int state;   // 1 网络可用  2不可用
    private String msg;

    public NetEvent(int state, String msg) {
        this.state = state;
        this.msg = msg;
    }

    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

————————————————————————————————————————————>

其实不用使用EventBus，使用内部类实现更为简单，多一个jar会导致apk文件过大的。

代码如下：直接以内部类的形式实现，第一次见广播的这种写法

package com.lantu.tuhuadmin.netbroadcast;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
/**
 * 网络监听广播
 */
public class MainActivity extends AppCompatActivity {

    private NetReceiver mReceiver;

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

        IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
        mReceiver = new NetReceiver();
        //注册一个广播接收者
        registerReceiver(mReceiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //取消
        unregisterReceiver(mReceiver);
    }

    class NetReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            //获取网络连接管理器
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            if (connectivityManager != null) {
                //获取网络联系信息
                NetworkInfo mobWorkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);   //手机流量连接
                NetworkInfo wifiNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);     //Wifi连接

                if ((mobWorkInfo != null && mobWorkInfo.isConnected()) || (wifiNetInfo != null && wifiNetInfo.isConnected())) {
                    //说明有网络连接   1表示有网络连接  2 表示没有网络连接
                    // int state = (mobWorkInfo != null && mobWorkInfo.isConnected()) || (wifiNetInfo != null && wifiNetInfo.isConnected()) ? 1 : 2;
                    Toast.makeText(MainActivity.this, "网络连接正常", Toast.LENGTH_LONG).show();
                } else {
                    //没有网络不进行处理
                }
            }
        }
    }
}