android 判斷是否有網絡N方法

 1. /**

* 獲取是否有網絡連接方法
*
* @param context
* @return
*/
public static NetworkInfo getActiveNetwork(Context context)
{
if (context == null)
return null;
ConnectivityManager mConnMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (mConnMgr == null)
return null;
NetworkInfo aActiveInfo = mConnMgr.getActiveNetworkInfo();
// 獲取活動網絡連接信息
return aActiveInfo;
}

PS：只要返回的不為空就是有網絡if(null != NetworkInfo getActiveNetwork(Context context))

2. /**

* 判斷sd卡是否可讀寫
*
* @return
*/
public static boolean isCanUseSdCard()
{
try
{
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
catch (Exception e)
{
e.printStackTrace();
}
return false;
}

3. /**

* 檢測String是否全是中文
*
* @param name
* @return
*/
public static boolean checkNameChese(String name)
{
boolean res = true;
char[] cTemp = name.toCharArray();
for (int i = 0; i < name.length(); i++)
{
if (!isChinese(cTemp[i]))
{
res = false;
break;
}
}
return res;
}

4./**

* 讀取本地或網絡圖片，轉換為Bitmap
*
* @param url
* @return
*/
public static Bitmap returnBitmap(String url)
{
URL myFileUrl = null;
Bitmap bitmap = null;
try
{
myFileUrl = new URL(url);
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
try
{
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
return bitmap;
}