网络判断

/**
	 * 检测网络是否连接
	 * 
	 * @return
	 */
	private boolean checkNetworkState() {
		boolean flag = false;
		manager2 = (ConnectivityManager) getActivity().getSystemService(
				Context.CONNECTIVITY_SERVICE);
		// 去进行判断网络是否连接
		if (manager2.getActiveNetworkInfo() != null) {
			flag = manager2.getActiveNetworkInfo().isAvailable();
		}
		if (!flag) {
			setNetwork();
		} else {
			isNetworkAvailable();
			getData();
			httpjson();
		}

		return flag;
	}

	/**
	 * 网络未连接时，调用设置方法
	 */
	private void setNetwork() {
		Toast.makeText(getActivity(), "请打开网络!", Toast.LENGTH_SHORT).show();

		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
		builder.setIcon(R.drawable.ic_launcher11);
		builder.setTitle("网络提示信息");
		builder.setMessage("网络不可用，如果继续，请先设置网络！");
		builder.setPositiveButton("设置", new DialogInterface.OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				Intent intent = null;
				/**
				 * 判断手机系统的版本！如果API大于10 就是3.0+ 因为3.0以上的版本的设置和3.0以下的设置不一样，调用的方法不同
				 */
				if (android.os.Build.VERSION.SDK_INT > 10) {
					intent = new Intent(
							android.provider.Settings.ACTION_WIFI_SETTINGS);
				} else {
					intent = new Intent();
					ComponentName component = new ComponentName(
							"com.android.settings",
							"com.android.settings.WirelessSettings");
					intent.setComponent(component);
					intent.setAction("android.intent.action.VIEW");
				}
				startActivity(intent);
			}
		});

		builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {

			}
		});
		builder.create();
		builder.show();
	}

	/**
	 * 网络已经连接，然后去判断是wifi连接还是GPRS连接 设置一些自己的逻辑调用
	 */
	private void isNetworkAvailable() {

		State gprs = manager2.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
				.getState();
		State wifi = manager2.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
				.getState();
		if (gprs == State.CONNECTED || gprs == State.CONNECTING) {
			Toast.makeText(getActivity(), "打开了! GPRS", Toast.LENGTH_SHORT)
					.show();
		}
		// 判断为wifi状态下才加载广告，
		if (wifi == State.CONNECTED || wifi == State.CONNECTING) {
			Toast.makeText(getActivity(), "打开了! wifi", Toast.LENGTH_SHORT)
					.show();
			// loadAdmob();
		}

	}