package com.example.app0710807_1; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView textView; Button Button_SET; Button Button_RESET; EditText editText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = (TextView)findViewById(R.id.textView); textView.setText("Hello"); editText = (EditText)findViewById(R.id.editText) ; Button_SET = (Button)findViewById(R.id.button_SET); Button_SET.setText("SET"); Button_SET.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ textView.setText("Welcome to Android, " + editText.getText().toString()); } }); Button_RESET = (Button)findViewById(R.id.button_RESET); Button_RESET.setText("RESET"); Button_RESET.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ textView.setText("Hello World!"); } }); } }