JobScheduler 不会运行在后台

Question

我正在尝试使用 JobScheduler 在后台运行一个会计计算器，但不知何故，它不会进行计算。该程序运行很顺利，这就是为什么它不起作用的原因让我感到困惑。感谢您的帮助。

这是我的工作服务class：

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public class MyJobService  extends JobService {
private JobParameters params;

int num1a;
int num1b;
int num2a;
int num2b;
int num3a;
int num3b;
int num4a;
int num4b;
int num5a;
int num5b;

int sum1;
int sum2;
int sum3;
int sum4;
int sum5;

SharedPreferences preferences;
SharedPreferences.Editor editor;

@Override
public boolean onStartJob(JobParameters params) {
    this.params = params;
    Toast.makeText(getApplicationContext(), "Start", Toast.LENGTH_LONG).show();
    new MonthlyTask().execute();
    return true;
}

@Override
public boolean onStopJob(JobParameters params) {
    return false;
}

private class MonthlyTask extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPostExecute(Void xVoid) {
        super.onPostExecute(xVoid);
        jobFinished(params, false);
        Toast.makeText(getApplicationContext(), "Finish", Toast.LENGTH_LONG).show();
    }

    @Override
    protected Void doInBackground(Void... params) {
        preferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        editor = preferences.edit();
        try {
            num1a = preferences.getInt("expense1", 0);
            num1b = preferences.getInt("subtotal1", 0);
            num2a = preferences.getInt("expense2", 0);
            num2b = preferences.getInt("subtotal2", 0);
            num3a = preferences.getInt("expense3", 0);
            num3b = preferences.getInt("subtotal3", 0);
            num4a = preferences.getInt("expense4", 0);
            num4b = preferences.getInt("subtotal4", 0);
            num5a = preferences.getInt("expense5", 0);
            num5b = preferences.getInt("subtotal5", 0);

        } catch (NumberFormatException nfe) {
            nfe.printStackTrace();
        }
        sum1 = num1a + num1b;
        sum2 = num2a + num2b;
        sum3 = num3a + num3b;
        sum4 = num4a + num4b;
        sum5 = num5a + num5b;

        editor.putInt("subtotal1", sum1);
        editor.putInt("subtotal2", sum2);
        editor.putInt("subtotal3", sum3);
        editor.putInt("subtotal4", sum4);
        editor.putInt("subtotal5", sum5);
        return null;
    }
}
}

这是我的主要内容Activity

    public class MainActivity extends AppCompatActivity implements android.view.View.OnClickListener{
    //Do stuffs
    public void onClick(View view) {
    if (view == findViewById(R.id.btnSave)) {
     JobInfo.Builder builder = new JobInfo.Builder(1, new ComponentName(getPackageName(),
                MyJobService.class.getName()));
        //run job service after every 5 seconds, which put back to 15 mins...but thats fine
        builder.setPeriodic(5000);
        builder.setPersisted(true);
        jobScheduler.schedule(builder.build());
        finish();
    }}

Answer 1

I am trying to run an accounting calculator in the background using JobScheduler

这个例子真的很奇怪。

but somehow, it won't do the calculation

嗯，嗯，如果按"the calculation"，你的意思是加法，就是做加法。但是，您随后丢弃了结果。您 edit() SharedPreferences 而没有调用 apply() 或 commit() 来保存更改。

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