Lukas Plevac Developer Lukas Plevac Developer - 19 days ago 10
Android Question

How get data from cordova-plugin-nativestorage in android java

Good day,
I making native background mod for Cordova and I need get data from js to java.
I save data in js with plugin cordova-plugin-nativestorage, with this code:

<!DOCTYPE html>
<html>
<head>
<title>Save data</title>

<script type="text/javascript" charset="utf-8" src="cordova.js"></script>
<script type="text/javascript" charset="utf-8">

function onLoad() {
document.addEventListener("deviceready", onDeviceReady, false);
}

function onDeviceReady() {
NativeStorage.setItem("somekey", "value", null, null);
}

</script>
</head>
<body onload="onLoad()">
</body>
</html>


but my problem is: I don’t know how to get this data ("value") with java in background services without Cordova activity.

Backgroud services java:

package cz.oznameni;

public class Backgroundoznameni extends Service {

}

Answer

I've made a change, so you chould conviently access the saved value.

Please first reinstall the plugin:

cordova plugin remove cordova-plugin-nativestorage
cordova plugin add https://github.com/TheCocoaProject/cordova-plugin-nativestorage

This will install the dev version. This because this updated code isn't pushed to NPM (UPDATE: it is now not necessary to use the dev version, the version on NPM is just fine).

For retrieving the value with a key , I've written the following method:

String getValue(Context context, String key, String defaultValue) {
        SharedPreferences settings = context.getSharedPreferences(PREFS_NAME, Activity.MODE_PRIVATE);
        return settings.getString(key, defaultValue);
    }

The PREFS_NAME should be declared as follows:

public static final String PREFS_NAME = "NativeStorage";

The context should be this accessable within the onCreate method.

So overall it should look something like this:

    public class Backgroundoznameni extends Service {
    public static final String PREFS_NAME = "NativeStorage";
      @Override
      public void onCreate() {
        String value = getValue(Backgroundoznameni.this, "somekey", null);
      }

      String getValue(Context context, String key, String defaultValue) {
            SharedPreferences settings = context.getSharedPreferences(PREFS_NAME, Activity.MODE_PRIVATE);
            return settings.getString(key, defaultValue);
        }
    }

NOTE: Code not tested!

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