判断android设备wifi连接状态，判断android设备wifi,添加访问权限（Andro

判断android设备wifi连接状态，判断android设备wifi,添加访问权限（Andro

添加访问权限（AndroidManifest.xml文件里）

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  ```Java代码（MainActivity.java文件）```java    package com.example.androidtest;      import android.net.ConnectivityManager;      import android.net.NetworkInfo.State;      import android.os.Bundle;      import android.app.Activity;      import android.content.Context;      import android.util.Log;      import android.view.Menu;      public class MainActivity extends Activity {          @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main);              boolean bFlag = isWifiAvailable(this.getApplicationContext());              if (bFlag) {                  Log.i("Wifi state - ", "connected");              } else {                  Log.i("Wifi state - ", "not connected");              }          }          /**          * 判断wifi连接状态          *           * @param ctx          * @return          */          public boolean isWifiAvailable(Context ctx) {              ConnectivityManager conMan = (ConnectivityManager) ctx                      .getSystemService(Context.CONNECTIVITY_SERVICE);              State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI)                      .getState();              if (State.CONNECTED == wifi) {                  return true;              } else {                  return false;              }          }          @Override          public boolean onCreateOptionsMenu(Menu menu) {              // Inflate the menu; this adds items to the action bar if it is present.              getMenuInflater().inflate(R.menu.activity_main, menu);              return true;          }      }