如何在 AsyncTask 中使用 ListAdapter？

Question

我试图在ListView 中显示IP Address。在我的代码中，我在TextView 中显示IP 地址。现在我正在尝试设置一个ListAdapter 来显示ArrayList 的内容。我不知道在哪里可以插入列表适配器。我在onPostExecute 中尝试过，但它在ListAdapter 参数上返回错误

setListAdapter(new ArrayAdapter<ClientScanResult>(this, android.R.layout.simple_list_item_1, clients));

我已经使用 setText & append 在 TextView 中显示。但是如何在 ListAdapter 中显示值？？

connect.java

public class connect extends Activity implements OnClickListener{
WifiApManager wifiApManager;
TextView tv;
Button ipscan;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.connect);
    tv =(TextView) findViewById(R.id.iptv);
    ipscan=(Button) findViewById(R.id.scan);
    ipscan.setOnClickListener(this);  
    ListView lv = (ListView) findViewById(R.id.list);


}
class scan extends AsyncTask<Void, Void, ArrayList<ClientScanResult>>{ 
    public Context context;
    ArrayList<ClientScanResult> clients= new  ArrayList<ClientScanResult>();
    public scan(Context c)  // constructor to take Context
    {
        context = c;   // Initialize your Context variable
    }

    protected ArrayList<ClientScanResult> doInBackground(Void... params) {
        wifiApManager = new WifiApManager(context);  // use the variable here
        return wifiApManager.getClientList(false);

    }

protected void onPostExecute(ArrayList<ClientScanResult> clients){

//tv.setText("WifiApState: " + wifiApManager.getWifiApState() + "\n\n");
    //tv.append("Clients: \n");
for (ClientScanResult clientScanResult : clients) //showin error in clients
    {
        //tv.append("####################\n");
       // tv.append("IpAddr: " + clientScanResult.getIpAddr() + "\n");
        // tv.append("Device: " + clientScanResult.getDevice() + "\n");
       // tv.append("HWAddr: " + clientScanResult.getHWAddr() + "\n");
       // tv.append("isReachable: " + clientScanResult.isReachable()+ "\n");
    }
}
}
@Override
public void onClick(View v) {
    // TODO Click Action...
    scan myScan = new scan(this); // pass the context to the constructor
    myScan.execute();
}
}

注意： 我评论了我用来在 TextView 中显示值的行。

Answer 1

I tried in the onPostExecute But it returned a Error on the ListAdapter Parameter

然后

setListAdapter(new ArrayAdapter<ClientScanResult>(this, android.R.layout.simple_list_item_1, clients));

但是您的 Activity 没有扩展 ListActivity

http://developer.android.com/reference/android/app/ListActivity.html

setListAdapter 是ListActivity 的一个方法。

将this 替换为connect.this。

还要遵循命名约定。将你的类命名为 Connect(C caps)

ListView lv; // declare as isntance variable
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.connect);
lv = (ListView) findViewById(R.id.list); // initialize

在onPostExecute

ArrayAdapter<ClientScanResult> adapter= new ArrayAdapter<ClientScanResult>(connect.this, android.R.layout.simple_list_item_1, clients)
lv.setAdapter(adapter);