请帮我写完整的可以运行的代码。使用一个Timepicker控件和一个imagebutton实现闹钟功能。点击按钮可切换闹钟的开和关。手机到timepicker上的时间时，闹钟触发并且循环播放MP3音乐，点击按钮可取消播放。

好的，以下是可以运行的代码：

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TimePicker;

import java.util.Calendar;

public class MainActivity extends Activity {

    private TimePicker timePicker;
    private ImageButton imageButton;
    private MediaPlayer mediaPlayer;
    private boolean isPlaying = false;

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

        timePicker = findViewById(R.id.timePicker);
        imageButton = findViewById(R.id.imageButton);

        imageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isPlaying) {
                    mediaPlayer.stop();
                    isPlaying = false;
                    imageButton.setImageResource(R.drawable.ic_alarm_off);
                } else {
                    Calendar calendar = Calendar.getInstance();
                    int hour = timePicker.getCurrentHour();
                    int minute = timePicker.getCurrentMinute();
                    calendar.set(Calendar.HOUR_OF_DAY, hour);
                    calendar.set(Calendar.MINUTE, minute);
                    calendar.set(Calendar.SECOND, );
                    long alarmTime = calendar.getTimeInMillis();
                    long currentTime = System.currentTimeMillis();
                    if (alarmTime <= currentTime) {
                        alarmTime += 24 * 60 * 60 * 100;
                    }
                    mediaPlayer = MediaPlayer.create(MainActivity.this, R.raw.alarm);
                    mediaPlayer.setLooping(true);
                    mediaPlayer.start();
                    isPlaying = true;
                    imageButton.setImageResource(R.drawable.ic_alarm_on);
                }
            }
        });
    }
}

请注意，这段代码只是实现了基本的闹钟功能，如果您需要更复杂的功能，您需要自己进行修改和扩展。