[英]Android - How to get calling Activity?
一個Activity
(SignInActivity)被調用的方法FunkcjeAPI
其中執行AsyncTask
。
我的AsyncTask
應該使用調用Activity
來顯示一個ProgressDialog
。 我不知道如何給構造函數一個正確的Activity
。 我嘗試了很多事情,閱讀了很多關於SO的教程和問題,但是找不到解決方案。 FunkcjeAPI
不是活動,所以我不能寫new Logowanie(this).execute(argumenty);
AsyncTask
調用代碼:
public class FunkcjeAPI {
static String dozwrotu = null;
public static String zalogujSie(final String nick, final String haslo)
{
String[] argumenty = {nick, haslo};
new Logowanie(/* WHAT HERE ? */).execute(argumenty); // HELP ME IN THAT LINE !!!!!!!!!!!!!
return dozwrotu;
}
我的AsyncTask
類代碼(在FunkcjeAPI
類中):
private class Logowanie extends AsyncTask<String, Void, String>
{
Activity wywolujaceActivity;
public Logowanie(Activity wywolujaceActivity) {
this.wywolujaceActivity = wywolujaceActivity;
}
@SuppressWarnings("deprecation")
@Override
protected void onPreExecute() {
wywolujaceActivity.showDialog(SignInActivit.PLEASE_WAIT_DIALOG);
}
@Override
protected String doInBackground(final String... argi) {
final JSONParser jParser = new JSONParser();
new Thread(new Runnable() {
public void run() {
final String json = jParser.getJSONFromUrl("http://tymonradzik.pl/THUNDER_HUNTER/thapi.php?q=login&username=" + argi[0] + "&password=" + argi[1] + "&imei=");
Handler mainHandler = new Handler(Looper.getMainLooper());
mainHandler.post(new Runnable() {
@Override
public void run() {
JSONObject jObject;
try {
jObject = new JSONObject(json);
Log.wtf("Link", "http://tymonradzik.pl/THUNDER_HUNTER/thapi.php?q=login&username=" + argi[0] + "&password=" + argi[1] + "&imei=");
Log.wtf("Link", json);
String error = jObject.getString("error");
if(error == "You reached daily query limit !") { nadajWartosc("You reached daily query limit !"); }
if(error == "0") {nadajWartosc(jObject.getString("token"));}
if(error == "1") {nadajWartosc("1");}
if(error == "Invalid username") {nadajWartosc("Invalid username");}
if(error == "Invalid password") {nadajWartosc("Invalid password");}
if(error == "This user is already logged in !") {nadajWartosc("This user is already logged in !");}
} catch (JSONException e1) {
e1.printStackTrace();
}
catch (NullPointerException e)
{
e.printStackTrace();
}
}
});
}}).start();
return dozwrotu;
}
@Override
protected void onPostExecute(String result) {
wywolujaceActivity.removeDialog(SignInActivit.PLEASE_WAIT_DIALOG);
}
}
向采用Activity
zalogujSie()
方法添加一個以上參數,然后使用此參數啟動AsyncTask:
public static String zalogujSie(Activity activity, final String nick, final String haslo)
{
// .....
new Logowanie(activity).execute(argumenty);
return dozwrotu;
}
然后,您可以從活動中調用此方法,如下所示:
FunkcjeAPI.zalogujSie(this, "Nick", "Haslo");
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