1
我想创建一个组,使当前设备的平板电脑作为接入点,但在回调方法onGroupInfoAvailable()
我得到了组的空指针。为什么?WiFi直接创建组空指针
manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
channel = manager.initialize(this, getMainLooper(), null);
manager.createGroup(channel, new ActionListener() {
@Override
public void onSuccess() {
manager.requestGroupInfo(channel, new GroupInfoListener() {
public void onGroupInfoAvailable(WifiP2pGroup group) {
if(group != null)
Toast.makeText(SasetBladderPadActivity.this, "Group Passphrase: "
+ group.getPassphrase(), Toast.LENGTH_LONG).show();
else
Toast.makeText(SasetBladderPadActivity.this, "Group is null ",
Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onFailure(int arg0) {
// TODO Auto-generated method stub
Toast.makeText(SasetBladderPadActivity.this, "Create group failed: " + arg0, \
Toast.LENGTH_LONG).show();
}
});
我也遇到过这种情况,'WifiP2pGroup'在回调函数中为null ...我通过在调用'requestGroupInfo'之前等待了一会儿,而不是立即从'onSuccess'修复它... – jjv360 2013-06-18 08:12:07
他是对的。设置一个计时器或一个事件来执行此操作。 – Chucky 2013-07-18 12:34:26