CODEWITHSUNDEEP
androidtextviewandroid-edittext
onepiece
onepiece

Reputation: 3529

Display EditText value in another TextView after edit

I have an EditText where the user inputs a string. After edit, the string is displayed in a TextView. I created a custom class called TextValidator which implements TextWatcher, to satisfy the parameters of the addTextChangedListener(TextWatcher watcher) method. When I run it, the moment I press a letter to input into the editText, the app crashes.

In the MainActivity:

EditText editText1 = (EditText)findViewById(R.id.editText1);
editText1.addTextChangedListener(new TextValidator((EditText)findViewById(R.id.editText1)));

In my TextValidator class:

public class TextValidator extends Activity implements TextWatcher {
    private EditText editText;

    public TextValidator(EditText editText) {
        this.editText = editText;
    }

    public void validate(TextView textView, String text)
    {
        //I want to later check the string for valid format
    }

    final public void afterTextChanged(Editable s) {
        ((EditText)findViewById(R.id.textView1)).setText(editText.getText().toString());
        //validate(textView, text);
    }

Upvotes: 0

Views: 3715

Answers (1)

gezdy
gezdy

Reputation: 3322

TextValidator do not extend Activity.

Solution:

public class TextValidator implements TextWatcher {
    private Context mContext;
    private EditText mEditText;
    private TextView mTextView;

    public TextValidator(Context mContext) {
        this.mContext = mContext;
        EditText mEditText = (EditText)mContext.findViewById(R.id.editText1);
        TextView mTextView = (TextView)mContext.findViewById(R.id.textView1);
    }

    public void validate(TextView textView, String text)
    {
        //I want to later check the string for valid format
    }

    final public void afterTextChanged(Editable s) {
        mTextView.setText(mEditText.getText().toString());
        //validate(textView, text);
    }
    ....

Upvotes: 2

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