android 判断是否有网络 方法 工具类里的几个常用方法
1. /**
* 获取是否有网络连接方法*
* @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();
// 获取活动网络连接信息
return aActiveInfo;
}
PS：只要返回的不为空就是有网络if(null != NetworkInfo getActiveNetwork(Context context))
2. /**
* 判断sd卡是否可读写
*
* @return
*/
public static boolean isCanUseSdCard()
{
try
{
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
catch (Exception e)
{
e.printStackTrace();
}
return false;
}
3. /**
* 检测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./**
* 读取本地或网络图片，转换为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;
}