Android中判断网络是不是连接并提示设置

/**	 * 判断网络是否连通	 * @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();		}

弹出对话框并设置

//如果网络连接				if(Util.isNetworkConnected(context)){					mMainFrameTask = new MainFrameTask();					mMainFrameTask.execute();				}else{					AlertDialog.Builder builder = new Builder(context);					builder.setTitle("设置网络");					builder.setMessage("网络错误，请设置网络");										builder.setPositiveButton("设置网络",new DialogInterface.OnClickListener() {												@Override						public void onClick(DialogInterface dialog, int which) {							//获取系统版本号							/* 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以后								//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();				}			}