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
image.png
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;
}
}
-
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
