我是Android编程中的佼佼者,我必须做一个CountdownTimer,它从用户使用两个数字选择器选择的数字开始(一个用于小时,另一个用于分钟)。
特征必须是:
- CountdownTimer必须在后台工作,并在到达00:00时通知用户。 我有这段代码:
package com.android.application;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.NumberPicker;
public class MainActivity extends Activity {
NotificationManager nm;
private static final int ID_NOTIFICACION_PERSONAL =1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
NumberPicker number1 = (NumberPicker)findViewById(R.id.horas);
NumberPicker number2 = (NumberPicker)findViewById(R.id.minutos);
Button btn_lanzar=(Button)findViewById(R.id.btn_notificacion);
number1.setMaxValue(10);
number1.setMinValue(0);
number2.setMinValue(0);
number2.setMaxValue(59);
int number3=number1.getValue();
int number4=number2.getValue();
nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
btn_lanzar.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Notification notification = new Notification(R.drawable.estacionamiento,"Estacionamiento Inteligente",System.currentTimeMillis());
PendingIntent intencionpendiente = PendingIntent.getActivity(getApplicationContext(),0, new Intent (getApplicationContext(),Segunda_ventana.class),0);
notification.setLatestEventInfo(getApplicationContext(), "Estacionamiento Inteligente", "Su Tiempo se ha Terminado", intencionpendiente);
nm.notify(ID_NOTIFICACION_PERSONAL, notification);
}
});
}
}
我不知道如何使CountdownTimer从用户选择的号码开始,并带有号码选择器和完成后的通知。
请有人帮助我。 :(
答案 0 :(得分:7)
使用Android的Timer和TimerTask课程。下面我假设您知道如何显示通知,就像您在问题中看到的那样。
与您的号码选择器一起,在静态布局中定义Button
,如下所示:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start CountDown"
android:onClick="startCountdown"
/>
上面我假设您也有相同布局的数字选择器。
Java活动代码可能如下:
NumberPicker hourPicker;
NumberPicker minutePicker;
@Override
protected void onCreate(Bundle savedInstanceState)
{
hourPicker = (NumberPicker)findViewById(R.id.horas);
minutePicker = (NumberPicker)findViewById(R.id.minutos);
hourPicker.setMaxValue(10);
hourPicker.setMinValue(0);
minutePicker.setMinValue(0);
minutePicker.setMaxValue(59);
}
public void startCountdown(View v)
{
//this fires when button was tapped
showTimerStartedNotification();
int hours = hourPicker.getValue();
int mins = minutePicker.getValue();
int millis = ((hours*60)+mins)*60000; // Need milliseconds to use Timer
new Timer().schedule(new TimerTask()
{
@Override
public void run()
{
//code that runs when timer is done
showTimerFinishedNotification();
}
}, millis);
}