我正在撰写这篇文章，因为我很绝望，没有任何想法。 我有一个任务是实现一个Android应用程序，它必须在一个屏幕上显示十个计时器。这些计时器可以停止并重置。即使退出应用程序，也应该保留计时器的倒计时（我知道，可以使用服务完成）。但我不知道如何将我的Timer类与服务绑定。也许有人可以给我任何想法？这是我的Timer类
package pavel.timer;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.CountDownTimer;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.SystemClock;
import java.io.IOException;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import android.widget.TextView;
public class Timer implements Parcelable{
private boolean isActivated;
private boolean isStopped;
private Context context;
private CountDownTimer timer;
private String name;
private long timeToGo;
private long untilFinish;
private String sound;
private AlarmManager alarmMgr;
private PendingIntent pending;
private MediaPlayer mediaPlayer;
Timer(){
isActivated = false;
isStopped = false;
name = "";
}
Timer(String _name, long _timeToGo, String _sound){
isStopped = true;
isActivated = false;
name = _name;
timeToGo = _timeToGo;
sound = _sound;
}
public void activate(long future, long interval,final TextView text,String _name,String _sound, Context _context,TimerActivity _ac){
SystemClock.uptimeMillis();
sound = _sound;
timeToGo = future;
untilFinish = timeToGo;
context = _context;
final TimerActivity ac = _ac;
alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, wake_up.class);
pending = PendingIntent.getBroadcast(context, 0, intent, 0);
alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime() +
future, pending);
timer = new CountDownTimer(future, interval){
public void onTick(long millisUntilFinished) {
if(!isStopped){
untilFinish = millisUntilFinished;
Time time = new Time(millisUntilFinished - 3 * 3600000);
String textTime = "";
Calendar calendar = GregorianCalendar.getInstance(); // creates a new calendar instance
calendar.setTime(time); // assigns calendar to given date
int hrs = calendar.get(Calendar.HOUR_OF_DAY); // gets hour in 24h format
int min = calendar.get(Calendar.MINUTE);
int sec = calendar.get(Calendar.SECOND);
if(millisUntilFinished > 3600000){
if(text.getTextSize() == 46)
text.setTextSize(36);
else
text.setTextSize(26);
}
if(hrs!=0)
textTime+=String.format("%02d",hrs)+":";
if(min!=0||hrs!=0)
textTime+=String.format("%02d",min)+":";
textTime+=String.format("%02d",sec);
text.setText(textTime);
}
}
public void onFinish() {
if(!isStopped){
if(!TimerActivity.active){
Intent i = new Intent(context,TimerActivity.class);
context.startActivity(i);
}
else{
ac.setVisible(true);
}
text.setText("DONE!");
// Uri myUri = Uri.parse(sound);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setVolume(1.0f, 1.0f);
try {
mediaPlayer.setDataSource(sound);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
mediaPlayer.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mediaPlayer.start();
}
}
};
name = _name;
isActivated = true;
timer.start();
}
public boolean isActivated(){
return isActivated;
}
public String getTime(){
Time time = new Time(untilFinish);
String textTime = "";
Calendar calendar = GregorianCalendar.getInstance(); // creates a new calendar instance
calendar.setTime(time); // assigns calendar to given date
int hrs = calendar.get(Calendar.HOUR_OF_DAY); // gets hour in 24h format
int min = calendar.get(Calendar.MINUTE);
int sec = calendar.get(Calendar.SECOND);
if(hrs!=0)
textTime+=String.format("%02d",hrs)+":";
if(min!=0||hrs!=0)
textTime+=String.format("%02d",min)+":";
textTime+=String.format("%02d",sec);
return textTime;
}
public String getName() {
return name;
}
public void stop() {
timer.cancel();
timer = null;
isStopped = true;
if(mediaPlayer!=null)
mediaPlayer.stop();
}
public boolean isStopped() {
return isStopped;
}
public long getTimer() {
return timeToGo;
}
public void start() {
isStopped = false;
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
/** save object in parcel */
public void writeToParcel(Parcel out, int flags) {
ArrayList<Boolean> flag = new ArrayList<Boolean>();
flag.add(isActivated);
flag.add(isStopped);
ArrayList<Long> longVal = new ArrayList<Long>();
longVal.add(timeToGo);
longVal.add(untilFinish);
out.writeArray(longVal.toArray());
List<String> data = new ArrayList<String>();
data.add(name);
data.add(sound);
out.writeStringList(data);
}
public static final Parcelable.Creator<Timer> CREATOR
= new Parcelable.Creator<Timer>() {
public Timer createFromParcel(Parcel in) {
return new Timer(in);
}
public Timer[] newArray(int size) {
return new Timer[size];
}
};
/** recreate object from parcel */
private Timer(Parcel in) {
ArrayList<String> data =new ArrayList<String>();
in.readStringList(data);
isActivated = false;
isStopped = true;
name = (String)data.get(0);
sound = (String)data.get(1);
long[] longVal = new long[2];
in.readLongArray(longVal);
timeToGo = longVal[0];
untilFinish = longVal[1];
boolean[] flag = new boolean[2];
in.readBooleanArray(flag);
isActivated = flag[0];
isStopped = flag[1];
}
public String getSound() {
// TODO Auto-generated method stub
return sound;
}
public long getUntilFinish() {
// TODO Auto-generated method stub
return untilFinish;
}
public String toString(){
String res = "";
return res;
}
}
答案 0 :(得分：0)
首先，您应该创建一个从Android框架扩展Service类的服务，一旦创建，您可以根据需要启动任意数量的实例，然后绑定它们以与活动（或任何其他对象）建立连接）。此答案解释了如何启动，停止和绑定服务：Bind service to activity in Android，您还可以在此处找到实施示例：http://www.vogella.com/tutorials/AndroidServices/article.html#service_activitybinding