android中的后台服务没有运行像oppo，vivo等设备

Posted 2021-05-05

我想在后台运行服务，即使应用程序被从堆栈中杀死。此功能在某些设备上正常运行。但是在oppo和vivo手机中，如果应用程序被杀，它就无法运行。对此有什么解决方案吗？如果没有，那么我如何打开允许权限屏幕。

这是我的代码：

timer_service.Java

import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.text.LoginFilter;
import android.util.Log;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import static com.gov.ojas1.WebView.TimerReceiver.CUSTOM_INTENT;


public class Timer_Service extends Service {

    public static String str_receiver = "com.countdowntimerservice.receiver";

    private Handler mHandler = new Handler();
    Calendar calendar;
    SimpleDateFormat simpleDateFormat;
    String strDate;
    Date date_current, date_diff;
    SharedPreferences mpref;
    SharedPreferences.Editor mEditor;

    private Timer mTimer = null;
    public static final long NOTIFY_INTERVAL = 1000;
    Intent intent;
    long int_timer;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        mEditor = mpref.edit();
        calendar = Calendar.getInstance();
        simpleDateFormat = new SimpleDateFormat("HH:mm:ss");

        mTimer = new Timer();
        mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);
        intent = new Intent(str_receiver);

        Random r = new Random();
        int i1 = r.nextInt(10800000 - 7200000) + 7200000;
//        int i1 = r.nextInt(300000 - 180000) + 180000;
//        int_timer = (long) (int) i1;

        int_timer =10000;
    }


    class TimeDisplayTimerTask extends TimerTask {

        @Override
        public void run() {
            mHandler.post(new Runnable() {

                @Override
                public void run() {

                    calendar = Calendar.getInstance();
                    simpleDateFormat = new SimpleDateFormat("HH:mm:ss");
                    strDate = simpleDateFormat.format(calendar.getTime());
                    Log.e("strDate", strDate);
                    twoDatesBetweenTime();

                }

            });
        }

    }

    public String twoDatesBetweenTime() {


        try {
            date_current = simpleDateFormat.parse(strDate);
        } catch (Exception e) {

        }

        try {
            date_diff = simpleDateFormat.parse(mpref.getString("data", ""));
        } catch (Exception e) {

        }

        try {


            long diff = date_current.getTime() - date_diff.getTime();
            Log.e("Diff", diff + "");


            Log.e("TImer", int_timer + "");


            long long_hours = int_timer - diff;
            long diffSeconds2 = long_hours / 1000 % 60;
            long diffMinutes2 = long_hours / (60 * 1000) % 60;
            long diffHours2 = long_hours / (60 * 60 * 1000) % 24;


            if (long_hours > 0) {
                String str_testing = diffHours2 + ":" + diffMinutes2 + ":" + diffSeconds2;

                Log.e("TIME", str_testing);

            } else {
                String str_testing = diffHours2 + ":" + diffMinutes2 + ":" + diffSeconds2;
                mEditor.putString("data", strDate).commit();
                fn_update();
                Log.e("TIME", "Finish");


            }
        } catch (Exception e) {
            mTimer.cancel();
            mTimer.purge();
            mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);
            e.printStackTrace();


        }

        return "";

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e("Service finish", "Finish");
    }

    private void fn_update() {

        Intent i = new Intent();
        i.setAction(CUSTOM_INTENT);
        i.putExtra("boolean", true);
        sendBroadcast(i);

    }

}

提前致谢。

答案

您可以使您的服务在前台运行，这应该可以解决此问题。

您可以参考以下链接执行相同操作：

Android - implementing startForeground for a service?

另一答案

对我有用的是在服务标签的清单中使用android:process标签：

<service [name, etc]
    android:process=":externalprocess"/>

这使得它在一个单独的进程上运行，因此服务不会与应用程序一起被杀死。