java—将数据从服务传输到活动

mf98qq94  于 2021-07-07  发布在  Java
关注(0)|答案(3)|浏览(406)

当用户杀死应用程序时,我的服务在后台运行。它有一个按钮,我可以返回到Map活动。但是,当用户在销毁应用程序后通过通知按钮返回到应用程序时,Map已创建,但我正在从我的服务传输到我的Map活动的信息为空。
当用户没有终止应用程序并通过通知按钮返回时,数据存在。
这是我的密码:

//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");

                }
          }

后台位置(服务意图)=从mapsactivity获取信息并将信息返回到mapsactivity。

//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。

4c8rllxm

4c8rllxm1#

您可以使用eventbus或广播接收器将数据从服务发送到活动/片段

mhd8tkvw

mhd8tkvw2#

有很多方法,我说其中一些:
1-在服务中使用存储数据(如SharedPreferences、db和…),在活动中使用检索
2-使用eventbus或广播接收器
3-使用从服务到活动的回调数据的回调模式

hgqdbh6s

hgqdbh6s3#

因此,感谢@mohammadreza,我在服务意图上使用了sharedpref,并且它起了作用。
我就是这么做的:

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"))));

             }

IsMyService正在运行:

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;
}

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