1
我想創建一個組,使當前設備的平板電腦作爲接入點,但在回調方法onGroupInfoAvailable()
我得到了組的空指針。爲什麼?WiFi直接創建組空指針
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();
}
});
我也遇到過這種情況,'WifiP2pGroup'在回調函數中爲null ...我通過在調用'requestGroupInfo'之前等待了一會兒,而不是立即從'onSuccess'修復它... – jjv360 2013-06-18 08:12:07
他是對的。設置一個計時器或一個事件來執行此操作。 – Chucky 2013-07-18 12:34:26