android 网络状态判断

官方文档:https://developer.android.com/reference/android/net/ConnectivityManager.html#getActiveNetworkInfo()



//Check network

public void CheckNetworkState()

{

boolean flag = false;

ConnectivityManager manager = (ConnectivityManager)getSystemService(

Context.CONNECTIVITY_SERVICE);

State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();

State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();

//如果3G、wifi、2G等网络状态是连接的，则退出，否则显示提示信息进入网络设置界面

if(mobile == State.CONNECTED||mobile==State.CONNECTING)

return;

if(wifi == State.CONNECTED||wifi==State.CONNECTING)

return;

showTips();

}



private void showTips()

{

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setIcon(android.R.drawable.ic_dialog_alert);

builder.setTitle(R.string.netstate);

builder.setMessage(R.string.setnetwork);

builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {



@Override

public void onClick(DialogInterface dialog, int which) {

// 如果没有网络连接，则进入网络设置界面

startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));

}

});

builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {



@Override

public void onClick(DialogInterface dialog, int which) {

dialog.cancel();

}

});

builder.create();

builder.show();

}