public void restartApp() {
        //启动页
        Intent intent = new Intent(OuYuBaseApplication.getBaseApplication(), SplashActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        OuYuBaseApplication.getBaseApplication().startActivity(intent);
        android.os.Process.killProcess(android.os.Process.myPid());
    }

在低版本中可以使用以下方法重启

/**
 * @author chenli
 * @create 2019/10/12
 * @Describe
 */
public class killSelfService extends Service {
    /**关闭应用后多久重新启动*/
    private static  long stopDelayed=50;
    private Handler handler;
    private String PackageName;
    public killSelfService() {
        handler=new Handler();
    }

    @Override
    public int onStartCommand(final Intent intent, int flags, int startId) {
        stopDelayed=intent.getLongExtra("Delayed",50);
        PackageName=intent.getStringExtra("PackageName");
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage(PackageName);
                startActivity(LaunchIntent);
                killSelfService.this.stopSelf();
            }
        },stopDelayed);
        return super.onStartCommand(intent, flags, startId);
    }


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

}

/**
 * 此工具类用来重启APP，只是单纯的重启，不做任何处理。
 * Created by 13itch on 2016/8/5.
 */
public class RestartAPPTool {

    /**
     * 重启整个APP
     * @param context
     * @param Delayed 延迟多少毫秒
     */
    public static void restartAPP(Context context, long Delayed){

        /**开启一个新的服务，用来重启本APP*/
        Intent intent1=new Intent(context, killSelfService.class);
        intent1.putExtra("PackageName",context.getPackageName());
        intent1.putExtra("Delayed",Delayed);
        context.startService(intent1);

        Observable.timer(Delayed/2, TimeUnit.MILLISECONDS).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<Long>() {
                    @Override
                    public void accept(Long aLong) throws Exception {
                        /**杀死整个进程**/
                        android.os.Process.killProcess(android.os.Process.myPid());
                    }
                });
    }
    /***重启整个APP*/
    public static void restartAPP(Context context){
        restartAPP(context,2000);
    }
}