将数据从服务转移到活动

Question

当用户杀死应用程序时，我的服务正在后台运行。它有一个按钮，我可以返回到地图活动。然而，当用户在销毁应用程序后通过通知按钮返回应用程序时，创建的地图，但我从服务转移到地图活动的信息为空。

当用户没有杀死应用程序并通过通知按钮返回时，数据就存在了。

这是我的代码：

//Map Activity
//OnPause = transfer the data to service intent(Working fine)
BackgroundLocation backgroundLocation = new BackgroundLocation();
mServiceIntent = new Intent(this, backgroundLocation.getClass());
if (!isMyServiceRunning(backgroundLocation.getClass())) {
mServiceIntent.putExtra("AddressBackgound",mAddress);
mServiceIntent.putExtra("AddressLatBackgound",destinationLat);
mServiceIntent.putExtra("AddressLngBackgound",destinationLng);
startService(mServiceIntent);
}

// OnMapReady = Getting the data from service intent(return null for all data)
if (myLocation != null) {
BackgroundLocation backgroundLocation = new BackgroundLocation();
mServiceIntent = new Intent(this, backgroundLocation.getClass());
Bundle extras = getIntent().getExtras();
if (isMyServiceRunning(backgroundLocation.getClass()) && extras != null) {
String mAddress2 = extras.getString("AddressBackgound22");
Double destinationLat2 = extras.getDouble("AddressLatBackgound22");
Double destinationLng2 = extras.getDouble("AddressLngBackgound22");
Log.e("onResume", "onResume stats");
Log.e("Address", "" + mAddress2);
Log.e("Lat", String.valueOf(destinationLat2));
Log.e("Lng", String.valueOf(destinationLng2));
Log.e("OnMapReady","Service is running....");
}
else{
Log.e("OnMapReady","Service is not running");
}
}

Background Location(Service Intent(=从MapsActivity获取信息，并将信息返回给MapsActivation。

//Service Intent 
// OnStartCommand

Bundle extras = intent.getExtras();
if (extras != null) {
//getting the data to the service is working fine even when the app killed the service still working with the data.
mAddress = extras.getString("AddressBackgound");
destinationLat = extras.getDouble("AddressLatBackgound");
destinationLng = extras.getDouble("AddressLngBackgound");

//This is what I am trying to send to MapsActivity:
extras.putString("AddressBackgound22",mAddress);
extras.putDouble("AddressLatBackgound22",destinationLat);
extras.putDouble("AddressLngBackgound22",destinationLng);

Log.e("onStartCommand", "onStartCommand started");
Log.e("Address","" + mAddress);
Log.e("Lat",  "" + destinationLat);
Log.e("Lng",  "" + destinationLng);

}

谢谢你抽出时间。

Answer 1

有很多方法，我说其中一些：

1-在服务中使用存储数据(如SharedPrefrences、DB和…(，并在活动中检索

2-使用事件总线或广播接收器

3-使用回调模式从服务到活动的回调数据

Answer 2

所以多亏了@Mohammadreza，我在服务意图上使用了sharedPref。

这就是我所做的：

public static final String MY_PREFS_NAME = "MyData";

//保存SharedPref(BackgroundActivity(：

SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
editor.putString("AddressBackgound",mAddress);
editor.putString("AddressLatBackgound", String.valueOf(destinationLat));
editor.putString("AddressLngBackgound", String.valueOf(destinationLng));
editor.apply();

//读取SharedPref(MapsActivity(：

SharedPreferences prefs = getSharedPreferences(BackgroundLocation.MY_PREFS_NAME, MODE_PRIVATE);

BackgroundLocation BackgroundLocation=新的BackgroundLocation((；

if (isMyServiceRunning(backgroundLocation.getClass()) && prefs != null ) {

String mAddress = prefs.getString("AddressBackgound","mAddress");
Double UserStartLocationLat = Double.parseDouble(String.valueOf(Double.valueOf(prefs.getString("UserStartLocationLat", "UserStartLocationLatNull"))));
Double UserStartLocationLng = Double.parseDouble(String.valueOf(Double.valueOf(prefs.getString("UserStartLocationLng", "UserStartLocationLngNull"))));
}

isMyServiceRunning：

private boolean isMyServiceRunning(Class<?> serviceClass) {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (serviceClass.getName().equals(service.service.getClassName())) {
Log.i ("Service status", "Running");
return true;
}
}
Log.i ("Service status", "Not running");
return false;
}

Answer 3

您可以使用事件总线或广播接收器将数据从服务发送到Activity/Fragment