SyncViews

package com.example.ridji.synctext;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    TextView textview;
    EditText edittext;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textview = (TextView) findViewById(R.id.tv);
        edittext = (EditText) findViewById(R.id.et);

        edittext.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                textview.setText(edittext.getText());
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
            @Override
            public void afterTextChanged(Editable s) { }
        });
    }
}