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我有一個登錄應用程序。當用戶填寫表單並單擊登錄按鈕時，它將從服務器獲取一個字符串並檢查，如果正確，則轉到下一個活動。一切正常，但第一次它不能存儲字符串。我認爲這是爲了後臺任務。後臺任務的值是字符串。所以if條件取決於該字符串值。在去下一個任務之前，我怎樣才能得到字符串。Android登錄身份驗證不起作用
這裏是我的活動：
public class LoginActivity extends Activity implements OnClickListener {
Button login;
EditText user, pass;
CheckBox ck;
String FILENAME = "check";
String checkenords;
String FILETOKEN = "token";
String tokenStr;
String responseStr;
String usernamefromuser;
int responsecode;
String passfromuser;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.sign_in);
user = (EditText) findViewById(R.id.editText1);
pass = (EditText) findViewById(R.id.editText2);
ck = (CheckBox) findViewById(R.id.checkBox1);
login = (Button) findViewById(R.id.btnlogin);
login.setOnClickListener(this);
}
class CreateUser extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
// Check for success tag
usernamefromuser = user.getText().toString();
passfromuser = pass.getText().toString();
Log.e("successss", "888888888888");
Log.e("Username", "User:" + usernamefromuser);
Log.e("Password", "pass:" + passfromuser);
HttpClient client = new DefaultHttpClient();
String url = "http://54.228.149.123/api/auth";
HttpPost httppost = new HttpPost(url);
// httppost.setHeader("Content-type", "application/json");
// httppost.setHeader("Accept", "application/json");
try {
List<NameValuePair> namevalpair = new ArrayList<NameValuePair>();
namevalpair.add(new BasicNameValuePair("pass", passfromuser));
namevalpair.add(new BasicNameValuePair("email",
usernamefromuser));
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(
namevalpair, HTTP.UTF_8);
httppost.setEntity(entity);
HttpResponse httpresponse = client.execute(httppost);
responsecode = httpresponse.getStatusLine().getStatusCode();
responseStr = EntityUtils.toString(httpresponse.getEntity());
Log.d("Authentication", "" + responsecode);
// Log.d("httpresponseeeee", httpresponse.toString());
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new CreateUser().execute();
if (responsecode == 200) {
tokenStr = responseStr;
try {
FileOutputStream fos = openFileOutput(FILETOKEN,
Context.MODE_PRIVATE);
fos.write(tokenStr.getBytes());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (ck.isChecked()) {
checkenords = "enable";
try {
FileOutputStream fos = openFileOutput(FILENAME,
Context.MODE_PRIVATE);
fos.write(checkenords.getBytes());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Intent inteGps = new Intent(LoginActivity.this, Gps.class);
startActivity(inteGps);
finish();
} else {
Intent inteGps = new Intent(LoginActivity.this, Gps.class);
startActivity(inteGps);
finish();
}
} else if (responsecode == 401) {
Toast.makeText(this, "Invalid Username or Password",
Toast.LENGTH_LONG).show();
} else{
Toast.makeText(this, "Please try again", Toast.LENGTH_LONG).show();
}
}
}
但對於第一次，它顯示 「請重試」，雖然responsecode = 200或responsecode = 401。請幫幫我。
「它不能存儲字符串」。但是哪裏？你想在哪裏存儲它。 – user1728071
在onclick方法中，我使用了一個條件if（responsecode == 200）{。所以我需要字符串（responsecode）。在這種情況之前。這就是爲什麼我使用「new CreateUser（）。execute（）;」，這應該保存「responsecode」的值。 –