Android 判断网络连接运用

if (isConnect(this) == false) {
new AlertDialog.Builder(
this)
.setTitle("网络错误")
.setMessage(
"网络连接失败，

请确认网络连接")
.setPositiveButton(
"确定",
new

DialogInterface.OnClickListener() {

@Override
public

void onClick(

DialogInterface arg0,

int arg1) {

// TODO Auto-generated method stub

}
}).show();
}

private boolean isConnect(
Gongzibai gongzibai) {
ConnectivityManager conManager = (ConnectivityManager)

getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = conManager
.getActiveNetworkInfo();

if (networkInfo != null) { // 注意，这个判断一定要的哦

，要不然会出错

return networkInfo
.isAvailable();

}

return false;

}

--------------manifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />