android TimePicker 24小时 代码

要在Android的`TimePicker`中设置24小时模式，你需要在创建并初始化`TimePicker`实例时指定`hourFormat`属性为`HOUR_FORMAT_24`. 这里是一个简单的例子：

首先，在XML布局文件中，添加`TimePicker`组件如之前所述：

<TimePicker
    android:id="@+id/time_picker_24_hour"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:timePickerMode="spinner"
    android:hourFormat="HOUR_FORMAT_24" />

然后，在对应的Activity或Fragment中，你可以这样做：

import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.TimePicker;

public class YourActivity extends AppCompatActivity {

    private TimePicker timePicker;

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

        timePicker = findViewById(R.id.time_picker_24_hour);
        timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
            @Override
            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                String timeFormat = String.format("%02d:%02d", hourOfDay, minute);
                // 更新UI或者其他操作
            }
        });

        View.OnClickListener showTimePickerButton = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                show24HourTimePicker();
            }
        };
        findViewById(R.id.show_time_button).setOnClickListener(showTimePickerButton);
    }

    private void show24HourTimePicker() {
        final Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        new TimePickerDialog(YourActivity.this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                if (hourOfDay >= 0 && hourOfDay <= 23 && minute >= 0 && minute <= 59) {
                    timePicker.setCurrentHour(hourOfDay);
                    timePicker.setCurrentMinute(minute);
                    onTimeChanged(timePicker, hourOfDay, minute); // 更新UI
                } else {
                    Toast.makeText(YourActivity.this, "Invalid time!", Toast.LENGTH_SHORT).show();
                }
            }
        }, hour, minute, true).show(); // 第四个参数是是否显示AM/PM选择，这里我们设定为true（24小时模式）
    }
}

在这个例子中，点击按钮会弹出一个24小时时间选择器，用户选择后会调用`onTimeChanged`方法更新UI。记得替换`YourActivity`和`activity_your_layout`为你实际的Activity名和布局ID。