Android中判斷網絡是否連接並提示設置

/** 
     * 判斷網絡是否連通 
     * @param context 
     * @return 
     */  
    public static boolean isNetworkConnected(Context context){  
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);  
        NetworkInfo info = cm.getActiveNetworkInfo();  
        return info != null && info.isConnected();    
    }  

//如果網絡連接  
                if(Util.isNetworkConnected(context)){  
                    mMainFrameTask = new MainFrameTask();  
                    mMainFrameTask.execute();  
                }else{  
                    AlertDialog.Builder builder = new Builder(context);  
                    builder.setTitle("設置網絡");  
                    builder.setMessage("網絡錯誤，請設置網絡");  
                      
                    builder.setPositiveButton("設置網絡",new DialogInterface.OnClickListener() {  
                          
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            //獲取系統版本號  
                            /* Build.VERSION_CODES 
                                1 (0x00000001)           Android 1.0             BASE 
                                2 (0x00000002)           Android 1.1             BASE_1_1 
                                3 (0x00000003)           Android 1.5             CUPCAKE 
                                4 (0x00000004)           Android 1.6             DONUT 
                                5 (0x00000005)           Android 2.0             ECLAIR 
                                6 (0x00000006)           Android 2.0.1          ECLAIR_0_1 
                                7 (0x00000007)           Android 2.1             ECLAIR_MR1 
                                8 (0x00000008)           Android 2.2             FROYO 
                                9 (0x00000009)           Android 2.3             GINGERBREAD 
                                10 (0x0000000a)         Android 2.3.3          GINGERBREAD_MR1 
                                11 (0x0000000b)         Android 3.0             HONEYCOMB 
                                12 (0x0000000c)         Android 3.1             HONEYCOMB_MR1 
                                13 (0x0000000d)         Android 3.2             HONEYCOMB_MR2 */  
                            int currentapiVersion=android.os.Build.VERSION.SDK_INT;  
                            System.out.println("currentapiVersion = " + currentapiVersion);  
                            Intent intent;  
                            if(currentapiVersion < 11){  
                                intent = new Intent();  
                                intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");  
                            }else{  
                                //3.0以後  
                                //intent = new Intent( android.provider.Settings.ACTION_WIRELESS_SETTINGS);  
                                intent = new Intent( android.provider.Settings.ACTION_SETTINGS);  
                            }  
                            context.startActivity(intent);  
                        }  
                    });  
                    builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  
                          
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                              
                        }  
                    });  
                    builder.create().show();  
                }  
            }