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

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 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;
                }
            }
        });
    }
}