Question

我想在我的应用中获取当前位置。我试过这个solution。

我必须检查权限，但我找不到如何检查权限nonActivity类。

我试过了：

public class MyLocation {

    public MyLocation(Context context){
        this.context = context;
    }

    public boolean getLocation(Context context, LocationResult result) {

        locationResult = result;
        if (lm == null)
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);



        if (gps_enabled)
            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                return true;
            }
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
        if (network_enabled)
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
        timer1 = new Timer();


        timer1.schedule(new GetLastLocation(context), 10000);

        return true;
    }



    class GetLastLocation extends TimerTask {
        Context context;

        public GetLastLocation(Context context){
           this.context = context;
        }
        @Override
        public void run() {

            //Context context = getClass().getgetApplicationContext();
            Location net_loc = null, gps_loc = null;
            if (gps_enabled)
                if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                    return;
                }gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if(network_enabled)
                net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        }
    }

}

在我的活动中，我传递了上下文;

MyLocation myLocation = new MyLocation(this);

我在GetLastLocation类中获得了权限错误;

E/AndroidRuntime: FATAL EXCEPTION: Timer-1
                                                                               Process: com.example.merve.myapplication, PID: 4124
                                                                               java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.Context.checkPermission(java.lang.String, int, int)' on a null object reference
                                                                                   at android.support.v4.content.ContextCompat.checkSelfPermission(ContextCompat.java:439)
                                                                                   at other.MyLocation$GetLastLocation.run(MyLocation.java:124)
                                                                                   at java.util.TimerThread.mainLoop(Timer.java:555)
                                                                                   at java.util.TimerThread.run(Timer.java:505)

MyLocation.java第124行：

            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && 
ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

我无法添加完整代码。

Answer 1

如果我不得不猜测，我会说这个

    public GetLastLocation(Context context){
        context = this.context;
    }

应该是

    public GetLastLocation(Context context){
        this.context = context;
    }

Answer 2

只需将您的活动或上下文对象传递给非活动类。 timertask不会在主线程上运行，因此您必须在其他地方请求权限。也许在创建GetLastLocation对象之前

如何检查nonActivity Class中的权限？

2 个答案: