EditText getText()返回空字符串 [英] EditText getText() returns empty string
问题描述
我有一个带有按钮的活动，当用户单击该按钮时，将显示一个带有2 EditText的AlertDialog，您可以在其中输入电子邮件和密码进行登录. 当我尝试从EditText获取文本时，我总是只得到空字符串. 布局login_alert是AlertDialog的布局. 这里的代码:
I have an activity with a button, when the user clicks on the button, an AlertDialog appear with 2 EditText where you put email and password to login. When I try to get the text from the EditText i always get only empty strings. The layout login_alert is the layout of the AlertDialog. Here the code:
View view = getLayoutInflater().inflate(R.layout.login_alert, null, false);
String email = ((EditText) view.findViewById(R.id.emailEditText)).getText().toString();
String password = ((EditText) view.findViewById(R.id.passwordEditText)).getText().toString();
System.out.println("DEBUG: "+email+", "+password); // Empty strings
活动代码:
public class MainActivity extends FragmentActivity {
public static final String mAPP_ID = "...";
public static final String USER_DB_URL = "...";
AssetsExtracter mTask;
private MainFragment mainFragment;
private List<User> usersList = new ArrayList<User>();
private User currentUser = null;
private Button labLoginButton;
private EditText emailET;
private EditText passwordET;
private ProgressDialog dialog;
private View alertView; /* THIS IS THE SOLUTION */
boolean userIsLogged = false;
static {
IMetaioSDKAndroid.loadNativeLibs();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.activity_main);
/*View view = getLayoutInflater().inflate(R.layout.login_alert, null, false); BEFORE*/
alertView = getLayoutInflater().inflate(R.layout.login_alert, null, false);
emailET = (EditText) view.findViewById(R.id.emailEditText);
passwordET = (EditText) view.findViewById(R.id.passwordEditText);
labLoginButton = (Button) findViewById(R.id.loginLabButton);
updateLoginButton();
dialog = new ProgressDialog(this);
dialog.setMessage("Signin in...");
if (savedInstanceState == null) {
// Add the fragment on initial activity setup
mainFragment = new MainFragment();
getSupportFragmentManager().beginTransaction()
.add(android.R.id.content, mainFragment).commit();
} else {
// Or set the fragment from restored state info
mainFragment = (MainFragment) getSupportFragmentManager()
.findFragmentById(android.R.id.content);
}
mTask = new AssetsExtracter();
mTask.execute(0);
}
/* THIS METHOD IS CALLED BY THE LOGIN BUTTON IN THE MAIN ACTIVITY LAYOUT */
public void onLabLoginButtonClick(View v) {
if (userIsLogged) {
currentUser = null;
userIsLogged = false;
updateLoginButton();
Toast.makeText(this, "Disconnected from Lab", Toast.LENGTH_SHORT)
.show();
} else {
/*View messageView = getLayoutInflater().inflate(
R.layout.login_alert, null, false); BEFORE */
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(R.drawable.icon_launcher);
builder.setTitle(R.string.login_string);
builder.setView(alertView); /* USING THE GLOBAL VARIABLE */
builder.setPositiveButton("Sign me", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface d, int which) {
dialog.show();
// Download user and return a List of User
DownloadFilesAsyncTask task = new DownloadFilesAsyncTask(USER_DB_URL) {
@Override
protected void onPostExecute(final List<User> result) {
usersList = result;
loginCheckRoutine(); //HERE I MANAGE THE LOGIN AND GETTING EMPTY STRING
}
};
task.execute();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.create();
builder.show();
}
}
public void updateLoginButton() {
if (userIsLogged) {
labLoginButton.setText(R.string.logout_string);
} else {
labLoginButton.setText(R.string.login_string);
}
}
public void loginCheckRoutine() {
String email = emailET.getText().toString();
String password = passwordET.getText().toString();
System.out.println("DEBUG: " + email + ", " + password); // EMPTY
// controllo nella lista se c'è l'utente coi dati inseriti
for (int i = 0; i < usersList.size(); i++) {
if (usersList.get(i).getEmail().equals(email)
&& password.equals("admin")) {
currentUser = usersList.get(i);
userIsLogged = true;
updateLoginButton();
dialog.dismiss();
break;
}
}
if (!userIsLogged) {
userIsLogged = false;
updateLoginButton();
dialog.dismiss();
Toast.makeText(MainActivity.this, "Login Failed",
Toast.LENGTH_SHORT).show();
}
}
}
问题已解决，解决方案: 在onCreate()中，我在View变量中添加alert_dialog布局.我将View变量设置为全局变量(在onCreate()之前)，然后在onLabLoginButtonClick()中，我不再对视图进行膨胀，但是我在onCreate()中实例化了该全局变量.希望它清楚.谢谢大家！
PROBLEM SOLVED, SOLUTION: In the onCreate() I inflate the alert_dialog layout in a View variable. I made that View variable global (before onCreate()) and then in onLabLoginButtonClick() I don't inflate the view again, but I use that global instantiated in the onCreate(). hope its clear. thank you all!
推荐答案
初始化后，您getText.除非您在xml中有文本，否则您将无法获取文本.在alertdialog按钮的onclick中，获取文本.
You getText just after initialization. Untill you have text in xml you won't get the text. In onclick of alertdialog button get the text.
声明
EdiText ed1,ed2; // before onCreate if in activity and onCraeteView in fragment
作为实例变量
View view = getLayoutInflater().inflate(R.layout.login_alert, null, false);
ed1= (EditText) view.findViewById(R.id.emailEditText))
ed2 = (EditText) view.findViewById(R.id.emailEditText);
然后在警告"对话框中单击按钮
then on Alert dialog Button click
String email = ed1.getText().toString();
String password= ed2.getText().toString()
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