Android studio中时间日期可以选择的代码

在Android Studio中选择时间和日期通常涉及到使用`DatePicker`和`TimePicker`组件，以及`Calendar`类或`java.time`包提供的API。以下是一个简单的示例：

// 导入所需的库
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.widget.Button;
import android.widget.CalendarView;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;

public class MainActivity extends AppCompatActivity {
    private TextView dateTextView;
    private TextView timeTextView;

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

        // 初始化UI元素
        dateTextView = findViewById(R.id.date_text_view);
        timeTextView = findViewById(R.id.time_text_view);

        // 创建按钮以显示日期选择对话框
        Button datePickerButton = findViewById(R.id.date_picker_button);
        datePickerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDatePicker();
            }
        });

        // 创建按钮以显示时间选择对话框
        Button timePickerButton = findViewById(R.id.time_picker_button);
        timePickerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showTimePicker();
            }
        });
    }

    private void showDatePicker() {
        DatePickerDialog dialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                String formattedDate = String.format("%04d-%02d-%02d", year, month + 1, dayOfMonth); // 注意月份是从0开始计数的
                dateTextView.setText(formattedDate);
            }
        }, Calendar.getInstance().get(Calendar.YEAR), Calendar.getInstance().get(Calendar.MONTH), Calendar.getInstance().get(Calendar.DAY_OF_MONTH));
        dialog.show();
    }

    private void showTimePicker() {
        TimePickerDialog dialog = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                String formattedTime = String.format("%02d:%02d", hourOfDay, minute);
                timeTextView.setText(formattedTime);
            }
        }, Calendar.getInstance().get(Calendar.HOUR_OF_DAY), Calendar.getInstance().get(Calendar.MINUTE), false /* 是否显示秒针 */);
        dialog.show();
    }
}

在这个例子中，我们创建了两个按钮分别触发日期和时间的选择，并处理回调函数将用户选择的日期和时间显示在相应的TextView上。