android-service

问题 I am a bit confused about how services function, notably these two things: From http://developer.android.com/guide/topics/fundamentals/services.html : A service is "started" when an application component (such as an activity) starts it by calling startService(). Once started, a service can run in the background indefinitely, even if the component that started it is destroyed. and: Caution: A service runs in the main thread of its hosting process—the service does not create its own thread and

问题 One of the new features of Android L is a battery saver that kicks in at 15%. Is there some way to detect when this is active, so my app will respond correctly? http://www.technobuffalo.com/2014/07/02/android-l-project-volta-battery-life/ I would like my app to get a callback from the operating system when the this mode is active so I can stop background services. If there is no callback, I could make a background process query for the battery level, but that seems wasteful. I also do not

问题 I am new to android and i have been analyzing the android source code to understand how the System services are implemented. My Question is am I able to create my own System Service and add it to the framework so that all the applications should be Able to access my service. Any comments/Code snippets would be helpful. Thanks to the Replier in advance. 回答1: public class MyService extends Service { private static MyService instance = null; public static boolean isInstanceCreated(){ return

问题 I am new to android and i have been analyzing the android source code to understand how the System services are implemented. My Question is am I able to create my own System Service and add it to the framework so that all the applications should be Able to access my service. Any comments/Code snippets would be helpful. Thanks to the Replier in advance. 回答1: public class MyService extends Service { private static MyService instance = null; public static boolean isInstanceCreated(){ return

问题 I need to call setVolumeControlStream from a service that plays some sound via STREAM_SYSTEM . Obviously in an Activity that is no problem, but how can I do this with a service? 回答1: From the looks of it, this isn't possible the way you are trying to do it. As said in the android reference The suggested audio stream will be tied to the window of this Activity Hence with a service that has no activity, there is no window to tie the audio stream to. However, It looks like you should be able to

问题 I suspect this isn't possible, given the nature of Android, but is there a way to create a view of sorts (perhaps using a Canvas object?) that is shown on top of all applications? My intent for this project is not malicious. I have created some simple Color Filter software for Windows that simply adds a window on top of all windows, which is filled with a user-chosen color, and has a low opacity. This adds a light tint to the screen which helps users with Scoptopic Sensitivity Syndrome use a

问题 I'm trying to get Android's TTS to run inside a service, but I have no idea why it isn't working, it compiles, doesn't crash, but it just doesn't work. The Toast notification do work though. package alarm.test; import android.app.Service; import com.google.tts.TextToSpeechBeta; import android.content.Intent; import android.os.IBinder; import android.widget.Toast; public class MyAlarmService extends Service { private TextToSpeechBeta myTts; private TextToSpeechBeta.OnInitListener

问题 I am stuck with a issue from last 2 days, I want to hit a api and show user a Toast when user swipe off the app from Background Task, I found that from service it is possible as onTaskRemoved is called when app is removed from background. Code : MyService.java public class MyService extends Service { private static final String TAG = MyService.class.getSimpleName(); Handler mHandler; @Override public void onCreate() { super.onCreate(); mHandler = new Handler(); } @Nullable @Override public

问题 I am developing an Android app that does Human Activity Recognition. It basically works like that - Service constantly reads the accelerator data and stores the recognized activity (i.e. Walking, running) in a database. The user can see all of the recognized activities in an ListView in activity (accesses the database). Every User table in the database has a pa_goal (physical activity goal) field which the Service reads from the database and does some checks. The user, of course, can change

问题 Looks like force stop should prevent app from running and it's even disable all app's alarms. However I found that notification in Google Calendar still shown fine even after force stop, and I all the time see Instagram app running, even when I kill it, it's just restart automatically and it's once again there. So, what is a way to make app running constantly? I'm doing app with reminders and need to show notifications in specific time, regardless how app was previously closed before. 回答1: If