我正在尝试生成一个始终保持活动状态的服务，即使用户关闭应用程序也是如此。根据这些线程
当应用程序关闭时保持位置服务处于活动状态 https://stackoverflow.com/questions/21441232/keep-location-service-alive-when-the-app-is-closed?rq=1
应用程序关闭时 Android 服务停止 https://stackoverflow.com/questions/16651009/android-service-stops-when-app-is-closed
Android：当应用程序被杀死时保持服务运行 https://stackoverflow.com/questions/30525784/android-keep-service-running-when-app-is-killed
这可以通过 IntentServices 或 Service.START_STICKY 来完成
然而，我尝试了这两种类型的服务，但都没有成功。换句话说，当用户关闭应用程序时，我的服务就会被终止。有人可以指出这是否可以做到以及如何做到吗？这是我尝试过但没有成功的方法：
使用意图服务：
public class MyIntentService extends IntentService {
private final int mPollingTimeMS = 500;
private int mInitializationPollingCount = 0;
private Thread mPollThread;
public MyIntentService() {
super("MyIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
mPollThread = new Thread() {
public void run() {
while (true) {
try {
Log.e(Constants.Engine.LOGGER_TAG_DEV,
"SDK Service Running: " +
mInitializationPollingCount * mPollingTimeMS +
"ms have elapsed");
mInitializationPollingCount++;
sleep(mPollingTimeMS);
} catch (Exception e) {
StackTraceElement trace = new Exception().getStackTrace()[0];
Logger.e(Constants.Engine.LOGGER_TAG_APP, "[Exception:" + e.toString() + "]" +
trace.getClassName() + "->" + trace.getMethodName() + ":" + trace.getLineNumber());
}
}
}
};
mPollThread.start();
}
}
以及服务：
public class MyService extends Service {
public MyService() {
}
private final int mPollingTimeMS = 500;
private int mInitializationPollingCount = 0;
private Thread mPollThread;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
mPollThread = new Thread() {
public void run() {
while (true) {
try {
Log.e(Constants.Engine.LOGGER_TAG_DEV,
"SDK Service Running: " +
mInitializationPollingCount * mPollingTimeMS +
"ms have elapsed");
mInitializationPollingCount++;
sleep(mPollingTimeMS);
} catch (Exception e) {
StackTraceElement trace = new Exception().getStackTrace()[0];
Logger.e(Constants.Engine.LOGGER_TAG_APP, "[Exception:" + e.toString() + "]" +
trace.getClassName() + "->" + trace.getMethodName() + ":" + trace.getLineNumber());
}
}
}
};
mPollThread.start();
return Service.START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
// I tried to return null here, but this
// service gets killed no matter what.
return null;
}
}
这是清单：
<service
android:name=".mycompany.MyService"
android:enabled="true"
android:exported="true"
android:process=":process1">
</service>
<service
android:name=".mycompany.MyIntentService"
android:process=":process2"
android:exported="false">
</service>
我要补充一点，我不是使用关闭按钮关闭测试应用程序，而是使用 Android 操作系统应用程序管理器。见下图
最后，驱动程序活动（不多）
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent1 = new Intent(getBaseContext(), MyService.class);
startService(intent1);
Intent intent2 = new Intent(getBaseContext(), MyIntentService.class);
startService(intent2);
}
}
我还尝试添加通知并使其成为前台服务，但仍然是同样的事情。当我关闭应用程序时，所有内容都会被杀死。这是我添加的：
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
showNotification();
...etc..
private void showNotification() {
Intent notificationIntent = new Intent(this, MainActivity.class);
notificationIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
int iconId = R.mipmap.ic_launcher;
int uniqueCode = new Random().nextInt(Integer.MAX_VALUE);
Notification notification = new NotificationCompat.Builder(this)
.setSmallIcon(iconId)
.setContentText("Context Text")
.setContentIntent(pendingIntent).build();
startForeground(uniqueCode, notification);
}
