Question

如果手机上的所有内容都已关闭，我的位置有问题，那样我应该显示该用户应该启用GPS，但问题是我应该在哪里调用对话框的显示？

这是我的代码：

Criteria c = new Criteria();

            location = locationManager.getLastKnownLocation(locationManager.getBestProvider(c, false));

            Log.v("--", "provider " + locationManager.getBestProvider(c, false));
            if (location == null) { 
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER, 1000, 1000, mLocationListener);

            }

事情是有时if(location == null)为真且locationManager.requestLocationUpdates没有执行。我该如何检查它是否执行？我的猜测是我应该在这里显示启用GPS对话框？有人可以给我一个指南吗？

Answer 1

当用户点击地图上的myLocation按钮时，我会亲自检查位置服务是否已启用：

googleMap.setOnMyLocationButtonClickListener(new OnMyLocationButtonClickListener() {

                @Override
                public boolean onMyLocationButtonClick() {

                    LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);

                    boolean enabledGPS = service
                            .isProviderEnabled(LocationManager.GPS_PROVIDER);
                    boolean enabledWiFi = service
                            .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

                    if (!enabledGPS) {

                        Toast.makeText(getApplicationContext(),
                                "GPS signal not found", Toast.LENGTH_LONG)
                                .show();
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        startActivity(intent);

                    } else if (!enabledWiFi) {

                        Toast.makeText(getApplicationContext(),
                                "Network signal not found",
                                Toast.LENGTH_LONG).show();
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        startActivity(intent);

                    }

                    return false;
                }
            });

是你想要的吗？

Answer 2

当您调用requestLocationUpdates（...）时，还要创建一个在位置更新后稍后过期的计时器，以便您可以检查是否已调用位置更新：

private static boolean hasUpdateHappened = false;
...

locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 1000, mLocationListener);
// mLocationListener should set hasUpdateHappened to true
...
myView.postDelayed(new Runnable() {
@Override
    public void run() {
        if (!hasUpdateHappened){
            //TODO Show dialog
        }
    }
}, 2000);

未启用其他位置服务时启用GPS

2 个答案: