Android中使用alarmManager+PendingIntent实现自定义闹钟

public class Alarm2Activity extends AppCompatActivity { private AlarmManager alarmManager; private PendingIntent pendingIntent; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_alarm2); //实例化闹钟个管理器 alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); } //设置闹钟（只响一次） public void startAlarmOne(View view){ //获取当前系统的时间 Calendar calendar=Calendar.getInstance(); int hour=calendar.get(Calendar.HOUR_OF_DAY); int minute=calendar.get(Calendar.MINUTE); //弹出时间对话框（选择时间） TimePickerDialog timePickerDialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {  @Override  public void onTimeSet(TimePicker timePicker, int i, int i1) {  //获取当前系统的时间  Calendar c=Calendar.getInstance();  c.set(Calendar.HOUR_OF_DAY,i);  c.set(Calendar.MINUTE,i1);  //打开一个Activity  Intent intent=new Intent();  intent.setAction("com.example.myandroid_27.ALARM");  PendingIntent pendingIntent= PendingIntent.getBroadcast(Alarm2Activity.this,0x101,intent,0);  //设置闹钟  alarmManager.set(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),pendingIntent);  } },hour,minute,true); timePickerDialog.show(); } //设置闹钟（在多长时间后闹钟响然后继续计时） public void startAlarmTwo(View view){ //获取当前系统的时间 Calendar calendar=Calendar.getInstance(); int h=calendar.get(Calendar.HOUR_OF_DAY); int m=calendar.get(Calendar.MINUTE); //弹出时间对话框（选择时间） TimePickerDialog timePickerDialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {  @Override  public void onTimeSet(TimePicker timePicker, int i, int i1) {  //获取选择的闹钟时间  Calendar c=Calendar.getInstance();  c.set(Calendar.HOUR_OF_DAY,i);  c.set(Calendar.MINUTE,i1);  //打开一个Activity  Intent intent=new Intent();  intent.setAction("com.example.myandroid_27.ALARM");  pendingIntent = PendingIntent.getBroadcast(Alarm2Activity.this,0x102,intent,0);  //闹钟什么时候继续执行  alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),5000, pendingIntent);  } },h,m,true); timePickerDialog.show(); } //关闭周期闹钟 public void startAlarmThree(View view){ alarmManager.cancel(pendingIntent); }}