How to validate multiple edittext fields with a pop-up message or alert dialog box?

问题

I'd like to know how to validate my 4 edittext fields if one or more of these fields are left empty after tapping the button to process the inputs. I have searched many solutions like using toast but It think it's not appropriate for multiple edittext fields and using textwatchers. I'd like the app to show a pop-up message or alert dialog box saying "Please fill up the necessary fields."

Any help would be appreciated.

回答1:

You can use below common function for checking the Null values of the edittext:

 public static boolean m_isError;
   public static void checkEntryForEmptyValue(EditText p_editText, String p_nullMsg)
{
    if (p_editText != null || p_nullMsg != null)
    {
        // use trim() while checking for blank values
        if ((p_editText.getText().toString().trim().equalsIgnoreCase("")) || (p_editText.getText().toString().trim().length() <= 0))
        {
            m_isError = true;
            p_editText.setError(p_nullMsg);
            p_editText.requestFocus();
        }
    }
}
}

Use the above function as below inside your button click listener:

CommonUtil.m_isError = false;
   CommonUtil.checkEntryForEmptyValue(edittext,getResources().
           getString(R.string.MessageEmpty));
    if (!CustomValidator.m_isError) 
    {
      Toast.makeText(getApplicationContext(),"Success", Toast.LENGTH_SHORT).show();
    }
   else
   {
   //Your dialog with the error messages.
   }

回答2:

u can use some tooltips for validation like qtip or poshytip

http://vadikom.com/demos/poshytip/

http://craigsworks.com/projects/qtip/

Write a validation function to check all text fields and append the tooltip object with the corresponding fields which fails the validation.

回答3:

The Simplest soulution is that check that if the fields are empty then show dialog here is simple code snippet

  private void checkEntries()
{

    if(!(email.getText().toString().equals("")))    
    {
        if(!(pass.getText().toString().equals("")))
        {
            if(UIHelper.getInstance().emailAddressValidation(email.getText().toString()))
            {
                if(pass.getText().length()>=5)
                {
                    sendLoginRequest(email.getText().toString(),pass.getText().toString(),Constants.PHONE_ID);
                }
                else
                {
                    dialogBoxInUIthread("String","Password length should be greater than 5 ",LoginController.this,true);
                }
            }
            else
            {

                dialogBoxInUIthread("String","Invalid Email Id",LoginController.this,true);

            }   
        }
        else
        {
            dialogBoxInUIthread("String","Please enter password",LoginController.this,true);
        }
    }
    else
    {
        dialogBoxInUIthread("String","Please enter email",LoginController.this,true);
    }

}



private void dialogBoxInUIthread(final String title,final String msg, Context context,final boolean completed) {
         /* runOnUiThread(new Runnable() {
           public void run() {*/
            AlertDialog.Builder alertbox = new AlertDialog.Builder(LoginController.this);
            alertbox.setTitle(title);
            alertbox.setMessage(msg);
            alertbox.setNeutralButton("OK", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface arg0, int arg1) {
                   if(completed){
                   }else{ }
               }
              });alertbox.show();
          /* }
          });*/
    }

回答4:

Use this validate function when you click on button and you can check the alert message after method is executed

boolean flag_1= true,flag_2=true,flag_3=true;
String alertmsg;

.

private boolean validate()
{
    EditText et1    = (EditText)findViewById(R.id.et1);
    EditText et2    = (EditText)findViewById(R.id.et2);
    EditText et3    = (EditText)findViewById(R.id.et3);


    if(et1.getText().toString().isEmpty())
    {
        alertmsg+=  "Please fill 1st\n";
        flag_1  =   false;
    }
    if(et2.getText().toString().isEmpty())
    {
        alertmsg+=  "Please fill 2nd\n";
        flag_2  =   false;
    }
    if(et3.getText().toString().isEmpty())
    {
        alertmsg+=  "Please fill 3rd";
        flag_3  =   false;  
    }

    return flag_1||flag_2||flag_3;
}

回答5:

Try this :

EDIT:

Call this onClick of your process-input button:

RelativeLayout rl = (RelativeLayout) findViewById(R.id.mRlayout1);
boolean success = formIsValid(rl);
if(success == false){
  // alert dialog box
}
else{
  // process ahead
}

Declare this function:

EDIT:

public boolean formIsValid(RelativeLayout layout) {
    for (int i = 0; i < layout.getChildCount(); i++) {
        View v = layout.getChildAt(i);
        Class<? extends View> c = v.getClass();
        if (c == EditText.class) {
            EditText et = (EditText) v;
            if(et.getText().toString().equals(""))
                return false;
            //Toast.makeText(getApplicationContext(), ""+et.getText().toString(), Toast.LENGTH_LONG).show();                
        } 
    }
    return true;
}

By this you can validate N number of input controls with single call.

Thanks.

来源：https://stackoverflow.com/questions/14393442/how-to-validate-multiple-edittext-fields-with-a-pop-up-message-or-alert-dialog-b