CODEWITHSUNDEEP
androidioscordovacross-platform
raghu
raghu

Reputation: 841

Migrating local storage from Cordova app to Android App

We have an application in Playstore which is developed using Cordova. Now we have rebuilt the total app in Native Android.

Now we want to upgrade the user from the previous app to the new app without logout.

For that, how to migrate local data of Cordova(window.localStorage) to Android shared preferences?

Upvotes: 1

Views: 920

Answers (2)

raghu
raghu

Reputation: 841

Finally, I have migrated local data as follows

  1. In Activity/Fragment view add webView and
        final WebView webView = findViewById(R.id.webView);
        WebSettings webSetting = webView.getSettings();
        webSetting.setJavaScriptEnabled(true);
        webSetting.setDomStorageEnabled(true);

        webView.setWebViewClient(new WebViewClient());

        //set callback to get data from webview to Native
        webView.addJavascriptInterface(new MyJavaScriptInterface(), "MyHandler");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            WebView.setWebContentsDebuggingEnabled(true);
        }

        //Create HTML file to read stored data in webView local storage and pass it to Native
        webView.loadUrl("file:///android_asset/readData.html");
  1. Create Class MyJavaScriptInterface to communicate between webView and native as follows
public class MyJavaScriptInterface {
        
        @JavascriptInterface
        public void sendKeyValue(String key, String value) {
            Log.d("sendKeyValue", "key:" + key + " value:" + value);
        }
     }

  1. In assets folder add following readData.html file

     <html>
 <body>
 <div id="result"></div>
 <div id="resultCount"></div>
 <script>
          // Check browser support
          if (typeof(Storage) !== "undefined") {

          for(i = 0; i < localStorage.length; i++) {
             console.log("key "+i+" "+localStorage.key(i));
             console.log("value"+i+" "+localStorage.key(i)+"= "+localStorage.getItem(localStorage.key(i)));
             window.MyHandler.sendKeyValue(localStorage.key(i), localStorage.getItem(localStorage.key(i)));
             }
          }

       </script>
 </body>
 </html>

Upvotes: 2

kalidoss rajendran
kalidoss rajendran

Reputation: 640

Use cordova-plugin-nativestorage.

It allows a simple yet native persistant method to save data in Android and iOS by natively implementing SharedPreferences in Android and NSDefault in iOS.

JavaScript:

cordova plugin add cordova-plugin-nativestorage

NativeStorage.setItem("username","kalidoss",setSuccess, setError);
            function setSuccess(obj) {
               alert(obj);
            }
            function setError(error) {
               alert(error.code);
            }

Java:

Context context =this;
String MyPREFERENCES = "NativeStorage";
SharedPreferences sharedpreferences = context.getSharedPreferences(MyPREFERENCES,Context.MODE_PRIVATE);
String name= sharedpreferences.getString("username","");

Upvotes: 0

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