我创建了一个程序,该程序将为从日期选择器手动设置的不同日期创建警报。代码工作正常。但是如果重新启动它会丢失数据并且警报不起作用,我该如何克服
我使用的代码是
int count;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OnClickListener setClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
/** This intent invokes the activity DemoActivity, which in turn opens the AlertDialog window */
Intent i = new Intent("in.com.example.demoactivity");
/** Creating a Pending Intent */
PendingIntent operation = PendingIntent.getActivity(getBaseContext(), count++, i, Intent.FLAG_ACTIVITY_NEW_TASK);
/** Getting a reference to the System Service ALARM_SERVICE */
AlarmManager alarmManager = (AlarmManager) getBaseContext().getSystemService(ALARM_SERVICE);
/** Getting a reference to DatePicker object available in the MainActivity */
DatePicker dpDate = (DatePicker) findViewById(R.id.dp_date);
/** Getting a reference to TimePicker object available in the MainActivity */
TimePicker tpTime = (TimePicker) findViewById(R.id.tp_time);
int year = dpDate.getYear();
int month = dpDate.getMonth();
int day = dpDate.getDayOfMonth();
int hour = tpTime.getCurrentHour();
int minute = tpTime.getCurrentMinute();
GregorianCalendar calendar = new GregorianCalendar(year,month,day, hour, minute);
long alarm_time = calendar.getTimeInMillis();
/** Setting an alarm, which invokes the operation at alart_time */
alarmManager.set(AlarmManager.RTC_WAKEUP , alarm_time , operation);
/** Alert is set successfully */
Toast.makeText(getBaseContext(), "Alarm is set successfully",Toast.LENGTH_SHORT).show();
}
};
OnClickListener quitClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
};
Button btnSetAlarm = ( Button ) findViewById(R.id.btn_set_alarm);
btnSetAlarm.setOnClickListener(setClickListener);
Button btnQuitAlarm = ( Button ) findViewById(R.id.btn_quit_alarm);
btnQuitAlarm.setOnClickListener(quitClickListener);
}
从那个到活动片段
public class DemoActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/** Creating an Alert Dialog Window */
AlertDemo alert = new AlertDemo();
/** Opening the Alert Dialog Window */
alert.show(getSupportFragmentManager(), "AlertDemo");
}
}
从这里到创建警报框的活动
公共类 AlertDemo 扩展 DialogFragment {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
/** Turn Screen On and Unlock the keypad when this alert dialog is displayed */
getActivity().getWindow().addFlags(LayoutParams.FLAG_TURN_SCREEN_ON | LayoutParams.FLAG_DISMISS_KEYGUARD);
/** Creating a alert dialog builder */
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
/** Setting title for the alert dialog */
builder.setTitle("Alarm");
/** Setting the content for the alert dialog */
builder.setMessage("An Alarm by AlarmManager");
/** Defining an OK button event listener */
builder.setPositiveButton("OK", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
/** Exit application on click OK */
getActivity().finish();
}
});
/** Creating the alert dialog window */
return builder.create();
}
/** The application should be exit, if the user presses the back button */
@Override
public void onDestroy() {
super.onDestroy();
getActivity().finish();
}
即使我重新启动设备,我也希望调用警报,请有人帮我解决它