我有一个登录页面，我想从网络上的数据库中验证用户名和密码。问题是在执行 AsyncTask 时我想返回用户名和密码值。但这并没有发生。
如何返回值？这是我的登录页面代码。
public class Login extends Activity {
Integer aaa=0;
Button b,b2;
RelativeLayout r;
TextView t, t2;
String str1, str2, username, password;
String A = null, B = null;
EditText et1, et2;
Dialog myDialog;
String FILENAME = "http://animsinc.com/query.php";
protected ProgressDialog dialog;
protected Handler h;
static InputStream in = null;
static JSONObject jObj = null;
static String json = "";
private static final String TAG_ID = "id";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.sign_in);
Display display = ((WindowManager)getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight() / 4;
r = (RelativeLayout) findViewById(R.id.RL);
RelativeLayout.LayoutParams r = new RelativeLayout.LayoutParams(width,
height);
t = (TextView) findViewById(R.id.textView1);
t2 = (TextView) findViewById(R.id.textView2);
t.setOnClickListener(link);
t2.setOnClickListener(fgtpass);
et1 = (EditText) findViewById(R.id.editText1);
et2 = (EditText) findViewById(R.id.editText2);
b2 = (Button) findViewById(R.id.button2);
b2.setOnClickListener(temp);
b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if ((et1.getText().length() == 0)
|| (et2.getText().length() == 0))
{
Toast.makeText(getApplicationContext(),
"Please enter correct details",Toast.LENGTH_LONG)
.show();
} else {
dialog = ProgressDialog.show(Login.this, "Loading",
"Please Wait...");
/* h = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
dialog.dismiss();
}
};
new Thread() {
@Override
public void run() {
super.run();
String st=startDownload();
try {
Thread.sleep(3000);
h.sendEmptyMessage(0);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}.start();*/
Toast.makeText(getApplicationContext(),""+st,Toast.LENGTH_LONG).show();
String st=startDownload();
Toast.makeText(getApplicationContext(),"aaa="+aaa, Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(),""+st, Toast.LENGTH_LONG).show();
}
if ((et1.getText().toString().equals(username))&& (et2.getText().toString().equals(password)))
{
Intent openStartingPoint = new Intent(Login.this,
UserActivity.class);
startActivity(openStartingPoint);
}
}
});
}
private
String startDownload() {
String C = null;
new AppTask().execute(FILENAME);
aaa++;
return C;
}
private View.OnClickListener temp = new View.OnClickListener() {
public void onClick(View V) {
Intent openStartingPoint = new Intent(Login.this,
UserActivity.class);
startActivity(openStartingPoint);
}
};
private View.OnClickListener link = new View.OnClickListener() {
public void onClick(View V) {
Intent openStartingPoint = new Intent(Login.this,
ContactDetails.class);
startActivity(openStartingPoint);
}
};
private View.OnClickListener fgtpass = new View.OnClickListener() {
public void onClick(View V) {
myDialog = new Dialog(Login.this);
myDialog.setContentView(R.layout.emailpop);
myDialog.setTitle("Forgot Password");
myDialog.setCancelable(true);
// for save
Button ok = (Button) myDialog.findViewById(R.id.button1);
ok.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
myDialog.dismiss();
}
});
myDialog.show();
}
};
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
public class AppTask extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected String doInBackground(String... params) {
String is = null;
str1 = et1.getText().toString();
str2 = et2.getText().toString();
if (str1.length() > 0 && str2.length() > 0) {
A = str1;
B = str2;
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://animsinc.com/query.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
2);
nameValuePairs.add(new BasicNameValuePair("username", str1));
nameValuePairs.add(new BasicNameValuePair("password", str2));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = EntityUtils.toString(entity);
JSONArray jArray = new JSONArray(is);
for (int i = 0; i < jArray.length(); i++) {
JSONObject jObject = jArray.getJSONObject(i);
username = jObject.getString("username");
password = jObject.getString("password");
aaa++;
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return username;
}
}
}