安卓学习-Http协议-检查网络状态

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

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.http.MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="检查网络是否可用"
        android:id="@+id/button"
        android:onClick="checkNetClick"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

MainActivity.java

package com.example.administrator.http;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

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

    public void checkNetClick(View view) {
boolean bool=isNetworkConnected(this);
      if (bool)
      {
          Toast.makeText(this,"网络可用",Toast.LENGTH_SHORT).show();
      }
        else
      {
          Toast.makeText(this,"网络不可用",Toast.LENGTH_SHORT).show();
      }
    }
    //检查网络是否可用
    public boolean isNetworkConnected(Context context)
    {
        if(context!=null)
        {
            ConnectivityManager mConnectivityManager= (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo=mConnectivityManager.getActiveNetworkInfo();
            if(mNetworkInfo!=null)
            {
                return mNetworkInfo.isAvailable();
            }

        }  return false;
    }
    //判断WIFI网络是否可用
    public boolean isWifiConnected(Context context)
    {
        if (context!=null)
        {
            ConnectivityManager mConnectivityManager= (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mWifiNetworkInfo=mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            if(mWifiNetworkInfo!=null)
            {
                return mWifiNetworkInfo.isAvailable();
            }
        }
        return false;
    }

    //检查MOBILE网络是否可用
    public boolean isMobileConnected(Context context)
    {
        if (context!=null)
        {
            ConnectivityManager mConnectivityManager= (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mMobileNetworkInfo=
                    mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            if(mMobileNetworkInfo!=null)
            {
                return mMobileNetworkInfo.isAvailable();
            }
        }
        return false;
    }

    //获取当前网络连接的类型信息
    public static int getConnectedType(Context context)
    {
        if(context!=null)
        {
            ConnectivityManager mConnectivityManager= (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo=mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo!=null&&mNetworkInfo.isAvailable())
            {
                return mNetworkInfo.getType();
            }
        }
        return -1;
    }

}