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This article is about how to use the SAP OData offline library to achieve Android application offline mode, the editor feels very practical, so share with you to learn, I hope you can learn something after reading this article, say no more, follow the editor to have a look.

Open Android studio, add the following dependency to the build.gradle of the project, and import the SAP OData offline library:

Implementation group:'com.sap.cloud.android', name:'offline-odata', version: sdkVersion

Click Sync now:

Create a new java file: SAPServiceManager.java

The import used is as follows:

Import android.content.Context;import android.util.Log;import android.widget.Toast;import com.sap.cloud.mobile.odata.core.AndroidSystem;import com.sap.cloud.mobile.odata.offline.OfflineODataDefiningQuery;import com.sap.cloud.mobile.odata.offline.OfflineODataException;import com.sap.cloud.mobile.odata.offline.OfflineODataParameters;import com.sap.cloud.mobile.odata.offline.OfflineODataProvider;import java.net.MalformedURLException;import java.net.URL;// commented out OfflineODataProvider and changed it to OfflineODataProvider//private OnlineODataProvider provider;private OfflineODataProvider provider Private static final String TAG = SAPServiceManager.class.getName ()

The setup method of OData offiline datastore:

Public void openODataStore (Action0 callback, Context context) {setupOfflineOData (callback, context);} private void setupOfflineOData (Action0 callback, Context context) {try {if (configurationData.loadData ()) {Toast.makeText (context, "Opening the offline store which may take a few moments the first time it is opened.", Toast.LENGTH_LONG). Show (); / / Initialize application context for use by OfflineODataProvider AndroidSystem.setContext (context) / commonly set parameters include setStoreEncryptionKey, setStoreName, setStorePath OfflineODataParameters offParam = new OfflineODataParameters (); String serviceUrl = configurationData.getServiceUrl (); URL url = new URL (serviceUrl + CONNECTION_ID_ESPMCONTAINER); provider = new OfflineODataProvider (url, offParam, ClientProvider.get ()); / / Specifies which entities we wish to include in the offline store provider.addDefiningQuery (new OfflineODataDefiningQuery ("Customers", "Customers", false)) } catch (MalformedURLException e) {e.printStackTrace ();} catch (OfflineODataException e) {e.printStackTrace ();} / / opens the offline store. This can take a minute or so the first time it is called as it is created and populated. Log.d (TAG, "About to call open on the offline store."); provider.open (()-> {Log.d (TAG, "Offline store opened."); eSPMContainer = new ESPMContainer (provider); callback.call (); syncOfflineData (); / / TODO could be triggered via a menu action}, (OfflineODataException offlineODataException)-> {Log.d (TAG, "Offline store did not open.", offlineODataException);}) } public void syncOfflineData () {/ / send the local changes to the back end OData service Log.d (TAG, "About to call provider.upload."); provider.upload (()-> {Log.d (TAG, "Successfully uploaded the changed data."); / / get changes from the back end OData service. Provider.download (()-> {Log.d (TAG, "Successfully downloaded the changed data.");}, (error)-> {Log.d (TAG, "Failed when downloading the changed data with error:" + error.getMessage ();});}, (error)-> {Log.d (TAG, "Failed when uploading the changed data with error:" + error.getMessage ()) };} public String getServiceRoot () {if (configurationData.loadData ()) {String serviceUrl = configurationData.getServiceUrl (); if (serviceRoot = = null) {serviceRoot = serviceUrl + "/" + CONNECTION_ID_ESPMCONTAINER;}} else {throw new IllegalStateException ("SAPService manager configurationData.loadData () failed.");} return serviceRoot;}

Create a new LogonActivity.java and call the previously implemented sapServiceManager.openODataStore:

The first time you run the application, you will find the initialization log of offline OData store:

Now you can test the offline mode and turn on the flight mode of the mobile device:

Select a customer stored on OData offline store and click the Edit button:

Modify the city field:

Close the application, turn off the flight mode of the device, start the application again, and observe in logcat that the data previously modified in offline mode has been automatically synchronized to the background online store:

The above is how to use the SAP OData offline library to achieve the offline mode of Android applications. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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