editText field is required before moving on to another Activity

Question

I have validation for editText. If the editText field is empty it should fail validation and stop the user moving on to another Activity,

Answer 1

You can also try this:

 if ( ( userName.getText().toString().trim().equals("")) ) 
 {
      Toast.makeText(getApplicationContext(), "User name is empty", Toast.LENGTH_SHORT).show();
 }
 else
 {
      Intent i = new Intent(getApplicationContext(), Login.class);
      startActivity(i);
 }

Answer 2

Try this:

bt.setOnClickListener(new OnClickListener() {
    public void onClick(View arg0)
    {
        String  str=et.getText().toString();

        if(str.equalsIgnoreCase(""))
        {
            et.setHint("please enter username");//it gives user to hint
            et.setError("please enter username");//it gives user to info message //use any one //
        }
        else
        {
            Intent in=new Intent(getApplicationContext(),second.class);
            startActivity(in);
        }
    }
});

Answer 3

It's easy...check if your EditText is empty as in below example below.

if( TextUtils.isEmpty(userName.getText())){
   /**
    *   You can Toast a message here that the Username is Empty    
    **/

   userName.setError( "First name is required!" );

}else{
   Intent i = new Intent(getApplicationContext(), Login.class);
   startActivity(i);
}

Answer 4

I know this is an old post, but I needed similar functionality in my application, so I deciced to develop a simple but powerful validator for ease of re-use.

link for github repo It's super easy to use.

1. Create a list of the fields you want to be mandatory
2. Call validateViewFields method and pass the list of views

code example for Activity:

    public class AddContractActivity extends AppCompatActivity {

    TextView contractDescriptionTextView;
    TextView totalAmountTextView;

    List<View> fieldsToBeValidated;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_contract);

        contractDescriptionTextView = findViewById(R.id.contractDescriptionEditText);
        totalAmountTextView = findViewById(R.id.totalAmountText);

        fieldsToBeValidated = new ArrayList<>(Arrays.asList(
                contractDescriptionTextView,
                totalAmountTextView));

        saveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!UIValidator.validateViewFields(fieldsToBeValidated, true)) {
                    Toast.makeText(AddContractActivity.this, "Missing Fields", Toast.LENGTH_SHORT).show();
                    mainScrollView.post(new Runnable() {
                        @Override
                        public void run() {
                            mainScrollView.smoothScrollTo(0, 0);
                        }
                    });
                    return;
                }
            }
        });
    }
}

Answer 5

Better to test empty textField using If condition for all required or special validation cases and setError to focus.

If(txtName.getText().toString().trim().equals(""))
{
//Your message or any other validation
}

Answer 6

I understand it's an old question but may this helps, you can use .isEmpty() instead of .equals()

if( userName.getText().toString().isEmpty()){

   /**
    *   You can Toast a message here that the Username is Empty    
    **/

   userName.setError( "First name is required!" );

}else{
   Intent i = new Intent(getApplicationContext(), Login.class);
   startActivity(i);
}