我正在开发一个项目,其中包括用户将时间选择器选择的任何时间,但当我退出应用程序并再次打开时,所选时间消失了。
是否可以保存时间戳数据并在下次应用启动时使用它们?谢谢
import java.util.Calendar;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;
import android.widget.TimePicker.OnTimeChangedListener;
public class AndroidTimeActivity extends Activity {
TimePicker myTimePicker;
Button buttonstartSetDialog;
Button buttonCancelAlarm;
TextView textAlarmPrompt;
private TimePicker timePicker;
CheckBox optRepeat;
SharedPreferences sPref;
final static int RQS_1 = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timePicker = (TimePicker)findViewById(R.id.picker);
optRepeat = (CheckBox)findViewById(R.id.optrepeat);
textAlarmPrompt = (TextView)findViewById(R.id.alarmprompt);
buttonstartSetDialog = (Button)findViewById(R.id.startSetDialog);
TimePicker dp = (TimePicker)this.findViewById(R.id.picker);
dp.setCurrentHour(1);
//
dp.setCurrentMinute(01);
buttonstartSetDialog.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
Calendar calSet = Calendar.getInstance();
calSet.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
calSet.set(Calendar.MINUTE, timePicker.getCurrentMinute());
calSet.set(Calendar.SECOND, 0);
calSet.set(Calendar.MILLISECOND, 0);
setAlarm(calSet, optRepeat.isChecked());
}});
buttonCancelAlarm = (Button)findViewById(R.id.cancel);
buttonCancelAlarm.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
cancelAlarm();
}});
}
private void setAlarm(Calendar targetCal, boolean repeat){
Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
if(repeat){
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
targetCal.getTimeInMillis(),
AlarmManager.INTERVAL_DAY,
pendingIntent);
textAlarmPrompt.setText(
"\n\n***\n"
+ "Alarm is set@ " + targetCal.getTime() + "\n"
+ "Repeat\n"
+ "***\n");
}else{
alarmManager.set(AlarmManager.RTC_WAKEUP,
targetCal.getTimeInMillis(),
pendingIntent);
textAlarmPrompt.setText(
"\n\n***\n"
+ "Alarm is set@ " + targetCal.getTime() + "\n"
+ "One shot\n"
+ "***\n");
}
}
private void cancelAlarm(){
textAlarmPrompt.setText(
"\n\n***\n"
+ "Alarm Cancelled! \n"
+ "***\n");
Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(pendingIntent);
timePicker.setOnTimeChangedListener(new OnTimeChangedListener(){
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
Toast.makeText(getApplicationContext(),
"onTimeChanged", Toast.LENGTH_SHORT).show();
}});
}
}
编辑:感谢kruczjak,我找到了解决方案:
我在onclick中使用此代码,以便在单击按钮时将值保存到首选项
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit(); editor.putInt("hour", timePicker.getCurrentHour()); editor.putInt("minute", timePicker.getCurrentMinute()); editor.commit();
并使用此代码打开首选项中最后保存的值
SharedPreferences prefs = getPreferences(MODE_PRIVATE); timePicker.setCurrentHour(prefs.getInt("hour", 1)); timePicker.setCurrentMinute(prefs.getInt("minute", 01));
答案 0 :(得分:1)
尝试覆盖活动中的onStop()
方法,并将代码保存到timePicker
的某个地方(数据库,文件甚至共享首选项)。
然后阅读并申请timePicker
onCreate()
请参阅此文章,了解更多http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle
的活动生命周期答案 1 :(得分:0)
将此代码添加到您的保存时间按钮
//Pref To save time picker
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
editor.putInt("hour", YourTimePicker.getCurrentHour());
editor.putInt("minute", YourTimePicker.getCurrentMinute());
editor.commit();
并在时间选择器活动的onCreate()中调用此方法
public void loadTimer(TimePicker timepicker) {
SharedPreferences prefs = getPreferences(MODE_PRIVATE);
timepicker.setCurrentHour(prefs.getInt("hour", 1));
timepicker.setCurrentMinute(prefs.getInt("minute", 01));
}
你会写
loadTimer(YourTimePicker);