在android中显示7天

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class MainActivity extends AppCompatActivity {
    private TextView dateTextView;

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

        dateTextView = findViewById(R.id.dateTextView);

        // 获取当前日期
        Calendar calendar = Calendar.getInstance();
        Date currentDate = calendar.getTime();

        // 计算7天后的日期
        calendar.add(Calendar.DAY_OF_YEAR, 7);
        Date sevenDaysLater = calendar.getTime();

        // 格式化日期
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String formattedDate = dateFormat.format(sevenDaysLater);

        // 在TextView中显示日期
        dateTextView.setText(formattedDate);
    }
}