我在这里观察到一个奇怪的场景。我有一个运行完美的后台 android 服务。但是当我从我的应用程序中终止进程或应用程序RecentApps时，会再次调用该onStartCommand方法。我不知道我哪里错了。我已经搜索了很多，但没有找到任何合适的解决方案。有人可以提一下我做错了什么吗？提前致谢
活动：
public class OptionSelectionActivity extends Activity implements
OnClickListener {
Timer time;
Intent serviceIntent;
private Button btn_selectionquiz, btn_alerts, btn_history;
ConnectionManager cm;
boolean isInternetPresent = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
Log.e("onCreate", "im Running");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_option_selection);
cm = new ConnectionManager(getApplicationContext());
isInternetPresent = cm.isConnected();
serviceIntent = new Intent(getApplicationContext(),MyService.class);
// serviceIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// isMyServiceRunning();
if(!isMyServiceRunning())
{
Toast.makeText(getBaseContext(), "There is no service running, starting service..", Toast.LENGTH_SHORT).show();
startService(serviceIntent);
}else
{
Toast.makeText(getBaseContext(), "Service is already running", Toast.LENGTH_SHORT).show();
}
XmlView();
RegisterListenerOnXml();
}
private void XmlView() {
btn_selectionquiz = (Button) findViewById(R.id.optionselection_btn_selectquiz);
btn_alerts = (Button) findViewById(R.id.optionselection_btn_alerts);
btn_history = (Button) findViewById(R.id.optionselection_btn_history);
}
private void RegisterListenerOnXml() {
btn_selectionquiz.setOnClickListener(this);
btn_alerts.setOnClickListener(this);
btn_history.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent i;
// TODO Auto-generated method stub
isInternetPresent = cm.isConnected();
if(isInternetPresent)
{
switch (v.getId()) {
case R.id.optionselection_btn_selectquiz:
// intent calling
i = new Intent(this, TeacherSelectionActivity.class);
startActivity(i);
break;
case R.id.optionselection_btn_history:
// intent calling
i = new Intent(this, QuizHistoryActivity.class);
startActivity(i);
break;
case R.id.optionselection_btn_alerts:
// intent calling
i = new Intent(this, GettingAlerts.class);
startActivity(i);
break;
default:
break;
}
}else
{
AlertDialogManager alert = new AlertDialogManager();
alert.showAlertDialog(OptionSelectionActivity.this, "Internet Conncetion", "No internet Connection", false);
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
if(!isMyServiceRunning())
{
Toast.makeText(getBaseContext(), "There is no service running, starting service..", Toast.LENGTH_SHORT).show();
// startService(serviceIntent);
}else
{
Toast.makeText(getBaseContext(), "Service is already running", Toast.LENGTH_SHORT).show();
}
}
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
String temp = service.service.getClassName();
if ("com.smartclasss.alerts.MyService".equals(temp)) {
return true;
}
}
return false;
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.e("onSTOP", "im calling...!!!!");
if(!isMyServiceRunning())
{
Toast.makeText(getBaseContext(), "There is no service running, starting service..", Toast.LENGTH_SHORT).show();
// startService(serviceIntent);
}else
{
Toast.makeText(getBaseContext(), "Service is already running", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.e("onRestart", "now im calling after onStop");
}
}
服务：
public class MyService extends Service{
private SharedPreferences prefs;
private String prefName = "userPrefs";
public static String GETTING_ALERTS_URL = "http://"
+ IPAddress.IP_Address.toString()
+ "//MyServices/Alerts/AlertService.svc/alert";
public static String TAG_NAME = "DoitResult";
public static String TAG_ALERT_TITLE = "alertTitle";
static String Serv_Response = "";
static String Serv_GettingQuiz_Response = "";
boolean flag = false;
boolean isServRun = true;
public Timer time;
ArrayList<Alerts> alertsList;
public static final String INTENT_NOTIFY = "com.blundell.tut.service.INTENT_NOTIFY";
// The system notification manager
private NotificationManager mNM;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e("Attendence", "Service Created");
// TODO Auto-generated method stub
time = new Timer();
time.schedule(new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
final String currentDate = df.format(Calendar.getInstance().getTime());
// Toast.makeText(getBaseContext(), "Service Started :"+" "+currentDate, Toast.LENGTH_LONG).show();
if(flag == false)
{
try {
savingDateinPref(currentDate);
new DoInBackground().execute(currentDate);
flag = true;
isServRun = false;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
String val = prefs.getString("TAG_KEY", "defValue");
if(!currentDate.equals(val))
{
flag = false;
prefs = getSharedPreferences(prefName, MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.remove("TAG_KEY");
//---saves the values---
editor.commit();
}
}
},0,5000);
return START_STICKY;
}
private class DoInBackground extends AsyncTask<String, Void, Void> {
String cellphoneDate = "";
ArrayList<Alerts> alertsList = new ArrayList<Alerts>();
@Override
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
cellphoneDate = params[0];
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(GETTING_ALERTS_URL + "/"
+ cellphoneDate);
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpGet);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpEntity httpEntity = httpResponse.getEntity();
try {
Serv_Response = EntityUtils.toString(httpEntity);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (Serv_Response != null) {
////////////////////////////new code for getting list ///////////////////
JSONObject jsonObj1 = new JSONObject(Serv_Response);
JSONArray alertName = jsonObj1.getJSONArray(TAG_NAME);
for (int i = 0; i < alertName.length(); i++) {
JSONObject c = alertName.getJSONObject(i);
String alert_title = c.getString(TAG_ALERT_TITLE);
Alerts alertObject = new Alerts();
alertObject.setAlertTitle(alert_title);
alertsList.add(alertObject);
}
}
} catch (JSONException e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
// Toast.makeText(getBaseContext(), "From Database :" + Serv_GettingQuiz_Response, Toast.LENGTH_LONG).show();
//String array[] = new String[size];
for(int i = 0; i < alertsList.size() ; i++ )
{
showNotification(alertsList.get(i).getAlertTitle(), "TAP for More Details", i);
// savingDate(Serv_GettingQuiz_Response);
}
}
}
private void savingDateinPref(String value){
prefs = getSharedPreferences(prefName, MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
//---save the values in the EditText view to preferences---
editor.putString("TAG_KEY",value);
//---saves the values---
editor.commit();
}
}
日志猫：
06-03 12:25:22.844: E/onCreate(29973): im Running
06-03 12:25:23.174: E/Attendence(29973): Service Created
06-03 12:25:30.702: E/onSTOP(29973): im calling...!!!!
06-03 12:25:32.274: E/onCreate(29973): im Running
06-03 12:25:33.655: E/onSTOP(29973): im calling...!!!!
06-03 12:25:34.366: E/onCreate(29973): im Running
06-03 12:25:35.878: E/onSTOP(29973): im calling...!!!!
06-03 12:25:36.869: E/onRestart(29973): now im calling after onStop
06-03 12:25:45.027: E/onSTOP(29973): im calling...!!!!
06-03 12:25:48.221: E/Attendence(30447): Service Created
在 logcat 中的最后一行显示它再次调用 onstartcommand 方法。为什么会这样？我的意思是说，即使我的 Activity 没有运行（服务在 oncreate 方法中启动，但在 logcat 中，当我销毁我的 App 时，控件直接转到 onStartCommand ）。