2018-12-15 set text on text view from input

package com.mukeshdak.mdfirstapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    Button b;
    EditText et;
    TextView tv;

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

        b = (Button) findViewById(R.id.button1);
        tv = (TextView) findViewById(R.id.text_view);
        et = (EditText) findViewById(R.id.text_edit);


        b.setOnClickListener(new View.OnClickListener(){

            public void onClick(View v){
                String Str = et.getText().toString();
                tv.setText(Str);

                Toast.makeText(MainActivity.this, Str, Toast.LENGTH_LONG).show();
            }
        });
    }
}