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我正在构建一个 JobService。这个 JobService 应该每 5 秒启动一次服务。但如果服务已经在运行,我不应该启动它。现在这是我的 JobService:

public class BleJobService extends JobService {
    JobParameters params;
    DoItTask doIt;
    @Override
    public boolean onStartJob(JobParameters jobParameters) {
        this.params = jobParameters;
        Log.d("TestService", "Work to be called from here");
        doIt = new DoItTask();
        doIt.execute();
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters jobParameters) {
        Log.d("TestService", "System calling to stop the job here");
        if (doIt != null)
            doIt.cancel(true);
        return false;
    }

    private class DoItTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected void onPostExecute(Void aVoid) {
            Log.d("DoItTask", "Clean up the task here and call jobFinished...");
        jobFinished(params, true);

            super.onPostExecute(aVoid);
        }
        @Override
        protected Void doInBackground(Void... params) {
            Log.d("DoItTask", "Working here...");
            startService(new Intent(getApplicationContext(), BlePowerService.class));
            return null;
        }
    }
}

在我的活动中,这是启动 JobService 的代码:

JobInfo jobInfo;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            jobInfo = new JobInfo.Builder(1, componentName)
                    .setMinimumLatency(5000)
                    /*.setExtras(bundle)*/.build();
        } else {
            jobInfo = new JobInfo.Builder(1, componentName)
                    .setPeriodic(5000)
                    /*.setExtras(bundle)*/.build();
        }
        jobScheduler.schedule(jobInfo);

但是这段代码不起作用,因为服务启动了两次,然后作业没有执行任务。

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