android——判断网络状态

package com.example.internet;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.net.ConnectivityManager;
import android.os.Bundle;

import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {
    private ConnectivityManager con;
    private boolean wifi;
    private boolean internet;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //获得句柄
        Button btn1 = (Button) this.findViewById(R.id.button1);
        
        //匿名内部类实现点击事件
        btn1.setOnClickListener(new OnClickListener(){
            
            public void onClick(View v) { //建议不使用匿名内部类，
                //这里加try catch是为了防止设备没给权限二停止运行影响用户体验，
                try {
                    //监视网络连接状态
                    con=(ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE);      
                    //getNetworkinfo  获取指定网络连接类型的信息
                    wifi=con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();  
                    internet=con.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();
                    
                } catch (Exception e) {
                    e.printStackTrace();
                }
                
                PackageManager pm = getPackageManager(); 
                //判断是否有权限
                boolean permission = (PackageManager.PERMISSION_GRANTED ==   
                        pm.checkPermission("android.permission.ACCESS_NETWORK_STATE", "com.example.internet"));  
                   
                if (permission) {  
                    
                    if(wifi | internet){  
                        //土司    弹框显示
                        Toast.makeText(MainActivity.this,  
                                "网络通畅", Toast.LENGTH_LONG)  
                                .show(); 
                    }else{  
                        Toast.makeText(MainActivity.this,   
                                "亲，网络连了么？", Toast.LENGTH_LONG)  
                                .show();  
                    } 
                    
                }else {  
                    //如果没权限则提示
                    Toast.makeText(MainActivity.this,   
                            "请打开相关网络状态权限，方便使用", Toast.LENGTH_LONG)  
                            .show();  
                }  
            }
            
        });
    }

try {  
            PackageInfo pack = pm.getPackageInfo("packageName",PackageManager.GET_PERMISSIONS);</span>  
            String[] permissionStrings = pack.requestedPermissions;  
            showToast("权限清单--->" + permissionStrings.toString());  
        } catch (NameNotFoundException e) {  
            e.printStackTrace();  
        }