gpsdemo

安卓8.0定位适配

官方安卓8.0改动介绍

https://developer.android.google.cn/about/versions/oreo/background-location-limits

截取部分图片

根据以上图片介绍，我们决定用Service显示一个前台通知，将获取的定位信息传给Activity。

1.services中bind部分

     public class LocalBinder extends Binder {
                public LocationForegroundService getLocationForegroundService() {
                    //Android O上才显示通知栏
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                        showNotify();
                    }
                    return LocationForegroundService.this;
                }
            }

2. 显示后台定位通知栏

    private void showNotify() {
        if (channel == null) {
            channel = createNotificationChannel();
        }
        NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext(), getPackageName());
        Intent intent = new Intent(this, MainActivity.class);
        builder.setContentIntent(PendingIntent.getActivity(this, 0, intent, 0))
                .setLargeIcon(BitmapFactory.decodeResource(this.getResources(), R.mipmap.ic_launcher))
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("正在后台定位")
                .setContentText("定位进行中")
                .setWhen(System.currentTimeMillis());
        Notification build = builder.build();
        //调用这个方法把服务设置成前台服务
        startForeground(110, build);
    }
   
    @TargetApi(Build.VERSION_CODES.O)
    private NotificationChannel createNotificationChannel() {
        NotificationChannel notificationChannel = new NotificationChannel(getPackageName(), getPackageName(), NotificationManager.IMPORTANCE_HIGH);
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(notificationChannel);
        return notificationChannel;
    }
   

3.获取定位信息

  public Location gps() {
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        Location location = null;
        //不加这段话会导致下面爆红,（这个俗称版本压制，哈哈哈哈哈哈）
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return null;
        }
        if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {//是否支持Network定位
            //获取最后的network定位信息
            location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

        }
        //网络获取定位为空时，每隔1秒请求一次
        if (location == null) {
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 1, locationListener);
        }

        return location;
    }

4.定位监听

 public interface LocationCallback {
        /**
         * 当前位置
         */
        void onLocation(Location location);
    }

private LocationCallback mLocationCallback;

public void setLocationCallback(LocationCallback mLocationCallback) {
    this.mLocationCallback = mLocationCallback;
}

private class LocationListener implements android.location.LocationListener {
    public LocationListener(String provider) {
        Log.e(TAG, "LocationListener " + provider);
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.e(TAG, "onLocationChanged: " + "当前坐标：" + location.getLatitude() + " : " + location.getLongitude());
        if (mLocationCallback != null) {
            mLocationCallback.onLocation(location);
        }
    }

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

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
}

5.记得释放Service

  @Override
    public void onDestroy() {
        stopForeground(true);
        stopSelf();
        super.onDestroy();
    }

services准备工作已经完成，记得在AndroidManifest中注册

1.Activity中记得请求运行时权限，否则无法获取定位

private ServiceConnection connection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        Log.e(TAG, "--->onServiceConnected");
        LocationForegroundService locationForegroundService = ((LocationForegroundService.LocalBinder) service).getLocationForegroundService();
        Location location = locationForegroundService.gps();
        if (location != null) {
            txt.setText("经度" + location.getLatitude() + "\n纬度:" + location.getLongitude());
        } else {
            txt.setText("无法获取地理位置1111");
        }

        locationForegroundService.setLocationCallback(new LocationForegroundService.LocationCallback() {
            @Override
            public void onLocation(Location location) {
                if (location != null) {
                    txt.setText("经度" + location.getLatitude() + "\n纬度:" + location.getLongitude());
                } else {
                    txt.setText("无法获取地理位置2222");
                }
            }
        });
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
};

2.安卓8.0获取定位需要打开定位服务，反正无法获取定位信息

   private boolean GPSOpen() {
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        // 通过GPS卫星定位,定位级别可以精确到街(通过24颗卫星定位,在室外和空旷的地方定位准确、速度快)
        boolean gps = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        // 通过WLAN或移动网络(3G/2G)确定的位置(也称作AGPS,辅助GPS定位。主要用于在室内或遮盖物(建筑群或茂密的深林等)密集的地方定位)
        boolean network = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        return gps || network;
    }


public void getLocation(View view) {
    
    if (android.os.Build.VERSION.SDK_INT >= 26) {
        //判断定位服务开启没有,没有跳转到设置页面
        if (!GPSOpen()) {
            Intent i = new Intent();
            i.setAction(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(i);
        }
    }
    //绑定服务
    Intent intent = new Intent(this, LocationForegroundService.class);
    isBound= bindService(intent, connection, Context.BIND_AUTO_CREATE);
}

3.同样的Activity销毁后也要解绑Service,为了避免ServiceConnection空指针需要定义一个变量 isBound

         @Override
    protected void onDestroy() {
        if (isBound) {
            unbindService(connection)
            isBound = false
        }
        super.onDestroy();
    }

到此适配已经完成了。看不明白的同学可以下载demo查看。demo中无 isBound 变量自行按照文章中的方式添加

demo地址：https://github.com/Lans/gpsdemo