API LV 14 以上有個新 override function public void onTaskRemoved( Intent rootIntent ) {}; This is called if the service is currently running and the user has removed a task that comes from the service's application.
public class Service_RestoreTime extends Service{
java.text.SimpleDateFormat sdfDateTimeString = new java.text.SimpleDateFormat("yyyy/MM/dd HH:mm");
int i=0;
final int DEFAULT_HH = 1;
final int DEFAULT_MM = 59;
final int DEFAULT_SS = 59;
int restore_hh;
int restore_mm;
int restore_ss;
static boolean serviceOnStart = false;
private Context mContext;
private ContentResolver mResolver;
private SharedPreferences mPref;
private String savedParameters;
@Override
public void onCreate() {
super.onCreate();
mContext = getApplicationContext(); //系統資料是安全的.
mResolver = getContentResolver(); //在這裡也可以存取database.
mPref = getSharedPreferences("Prefs", 0); //建議在onDestroy裡面實作儲存parameter的動作，並在這裡回復。
IntentFilter filter = new IntentFilter();
filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
registerReceiver(mReceiver, filter); //broadcast receiver 也安全。
}
private Handler handler = new Handler();
@Override
public void onStart(Intent intent, int startId) {
int now_hh = mPref.getInt("HH", DEFAULT_HH);
int now_mm = mPref.getInt("MM", DEFAULT_MM);
int now_ss = mPref.getInt("SS", DEFAULT_SS);
if((now_hh == 0) && (now_mm == 0) && (now_ss == 0)){
restore_hh=DEFAULT_HH;
restore_mm=DEFAULT_MM;
restore_ss=DEFAULT_SS;
}else{
restore_hh = now_hh;
restore_mm = now_mm;
restore_ss = now_ss;
}
handler.postDelayed(showTime, 1000);//每隔一秒啟動一次
super.onStart(intent, startId);
}
// 當service被移除時, 將值存入SharedPreferences
@Override
public void onTaskRemoved(Intent rootIntent) {
super.onTaskRemoved(rootIntent);
Editor editor = mPref.edit();
editor.putInt("HH", restore_hh);
editor.putInt("MM", restore_mm);
editor.putInt("SS", restore_ss);
editor.commit();
}
// 被系統low memory killed 並重啓的時候， intent為null
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
return START_STICKY; //回傳此值才能讓系統幫你在資源允許的時候自動回復service。
}
private Runnable showTime = new Runnable() {
public void run() {
String time = String.valueOf(restore_hh)+":"+String.valueOf(restore_mm)+":"+String.valueOf(restore_ss);
if(MainActivity.time != null){
MainActivity.time.setText(getString(R.string.tv_hint_restoretime, time));
}
if((restore_hh == 0) && (restore_mm == 0) && (restore_ss == 0)){
commitPref();
if(MainActivity.time != null){
MainActivity.time.setText(String.valueOf(MainActivity.PLAYTIMESDAILY));
}
serviceOnStart = false;
handler.removeCallbacks(showTime);
return;//會讓這個function迴圈停止
}else{
count();
restore_ss--;
}
serviceOnStart = true;
handler.postDelayed(this, 1000);//一定要放最後面, 否則在後面的code會執行不到
}
};
public void count() {
if(restore_ss == 0){
restore_mm--;
restore_ss = DEFAULT_SS+1;
if(restore_mm == -1){
restore_ss = DEFAULT_SS+1;
restore_mm = DEFAULT_MM;
restore_hh--;
if(restore_hh == -1){
restore_ss = DEFAULT_SS+1;
restore_mm = DEFAULT_MM;
}
}
}
}
}
============================Log===============================
07-21 18:02:04.420: D/522(1703): -[1][Service_RestoreTime][onTaskRemoved]user手動移除service
07-21 18:02:04.500: D/522(1703): -[1][Service_RestoreTime][commitPref]存入hh = 1
07-21 18:02:04.510: D/522(1703): -[1][Service_RestoreTime][commitPref]存入mm = 42
07-21 18:02:04.515: D/522(1703): -[1][Service_RestoreTime][commitPref]存入ss = 34
07-21 18:02:29.815: D/522(4356): -[1][Service_RestoreTime][onStartCommand] 07-21 18:02:29.830: D/522(4356): -[1][Service_RestoreTime][onStart]取出hh = 1 07-21 18:02:29.830: D/522(4356): -[1][Service_RestoreTime][onStart]取出mm = 42
07-21 18:02:29.830: D/522(4356): -[1][Service_RestoreTime][onStart]取出ss = 34 07-21 18:02:29.835: D/522(4356): -[1][Service_RestoreTime][onStart]接續server, 1:42:34
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Activity啟動service：
Intent intent = new Intent(context, Service_RestoreTime.class); startService(intent);
Activity關閉service：
Intent intent = new Intent(tabActivity.this, Service_RestoreTime.class); stopService(intent);
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