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本篇文章給大家分享的是有關(guān)如何使用SAP OData offline庫(kù)實(shí)現(xiàn)Android應(yīng)用的離線模式,小編覺(jué)得挺實(shí)用的,因此分享給大家學(xué)習(xí),希望大家閱讀完這篇文章后可以有所收獲,話不多說(shuō),跟著小編一起來(lái)看看吧。
打開(kāi)Android studio,在工程的build.gradle里加入下面的依賴(lài),導(dǎo)入SAP OData offline庫(kù):
點(diǎn)擊Sync now:
新建一個(gè)java文件:SAPServiceManager.java
使用的import如下:
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; // 將OfflineODataProvider注釋掉,改為OfflineODataProvider //private OnlineODataProvider provider; private OfflineODataProvider provider; private static final String TAG = SAPServiceManager.class.getName();
OData offiline datastore的setup方法:
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; }
新建LogonActivity.java,調(diào)用之前實(shí)現(xiàn)的sapServiceManager.openODataStore:
第一次運(yùn)行應(yīng)用,會(huì)發(fā)現(xiàn)offline OData store的初始化日志:
現(xiàn)在可以測(cè)試離線模式了,打開(kāi)移動(dòng)設(shè)備的飛行模式:
選擇存儲(chǔ)于OData offline store上的某個(gè)客戶,點(diǎn)擊編輯按鈕:
修改city字段:
關(guān)閉該應(yīng)用,關(guān)閉設(shè)備的飛行模式,再啟動(dòng)該應(yīng)用,在logcat里能觀察到之前處于離線模式修改的數(shù)據(jù)已經(jīng)自動(dòng)同步到了后臺(tái)online store里:
以上就是如何使用SAP OData offline庫(kù)實(shí)現(xiàn)Android應(yīng)用的離線模式,小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘9ぷ鲿?huì)見(jiàn)到或用到的。希望你能通過(guò)這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注億速云行業(yè)資訊頻道。
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