服务中的Android位置更新

Question

我想做这样的事情:

• 当我的应用程序启动时,我想启动一个应检查我的位置的服务

• 当应用程序进入后台时,我想停止服务

我有两个主要问题:

1. 如何检测到我的应用程序转到后台？我有几个活动,我在我的MainActivity中尝试覆盖onPause,但是当我开始其他活动时也会调用onPause.

2. 这个问题更重要:我的服务如何检查我的位置是什么样的？我尝试了几种方法,但没有成功.

我的服务看起来像这样,但它不起作用.我应该改变什么来使它工作？

package com.pivoscore.service;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;

public class LocationService extends Service {

    private LocationListener locationListener;

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

    @Override
    public int onStartCommand(final Intent intent, final int flags, final int startId) {
        super.onStartCommand(intent, flags, startId);
        return Service.START_STICKY;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        final LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        this.locationListener = new MyLocationListener();
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 100, 0, this.locationListener);
    }

    private static class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(final Location location) {
        }

        @Override
        public void onProviderDisabled(final String provider) {
        }

        @Override
        public void onProviderEnabled(final String provider) {
        }

        @Override
        public void onStatusChanged(final String provider, final int status, final Bundle extras) {
        }

    }

}

Answer 1

尝试此代码。通过使用此代码，您可以确定您的应用程序是在前台还是后台。希望对你有帮助。

try {
    foreground = new ForegroundCheckTask().execute(ctx).get();
}

======================================


class ForegroundCheckTask extends AsyncTask<Context, Void, Boolean> {

@Override
protected Boolean doInBackground(Context... params) {
    final Context context = params[0].getApplicationContext();
    return isAppOnForeground(context);
}

private boolean isAppOnForeground(Context context) {
    ActivityManager activityManager = (ActivityManager) context
            .getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningAppProcessInfo> appProcesses = activityManager
            .getRunningAppProcesses();
    if (appProcesses == null) {
        return false;
    }
    final String packageName = context.getPackageName();


    String activePackageName = activityManager.getRunningTasks(1).get(0).topActivity.getPackageName();
    if (activePackageName.equals(packageName)) {
        return true;
    }
    else{
        return false;
    }


}

}