【Android studio】为按钮添加简单事件

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="71dp"
android:layout_marginStart="228dp"
android:layout_marginTop="134dp"
android:onClick="myClick"//添加一行这个，为按钮按下事件方法起名
android:text="Button"
app:layout_constraintBottom_toTopOf="@+id/textView2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
3.在MainActivity.java里MainActivity类里添加方法

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void myClick(View view)//按钮按下事件的内容
{
TextView name=findViewById(R.id.textView2);

name.setText("Click");
}
}