2021.2.12

今天完成显示正确与错误提示功能

public class chenggong extends AppCompatActivity {

    Button button;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_chenggong);

        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent intent = new Intent();

                intent.setClass(chenggong.this,MainActivity.class);

                startActivity(intent);

            }

        });

    }

}