android 判断网络状态

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

private boolean getNetWorkStatus() {

boolean netSataus = false;
ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

cwjManager.getActiveNetworkInfo();

if (cwjManager.getActiveNetworkInfo() != null) {
netSataus = cwjManager.getActiveNetworkInfo().isAvailable();
}

if (!netSataus) {
Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络")
.setMessage("是否对网络进行设置？");
b.setPositiveButton("是", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Intent mIntent = new Intent("/");
ComponentName comp = new ComponentName(
"com.android.settings",
"com.android.settings.WirelessSettings");
mIntent.setComponent(comp);
mIntent.setAction("android.intent.action.VIEW");
startActivityForResult(mIntent,0);
}
}).setNeutralButton("否", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.cancel();
}
}).show();
}

return netSataus;
}