[jira] [Created] (CB-6890) Android plugins which use pluginManager fields break on 4.0.x branch

[Ian Clelland (JIRA)]

Ian Clelland created CB-6890:
--------------------------------

             Summary: Android plugins which use pluginManager fields break on 
4.0.x branch
                 Key: CB-6890
                 URL: https://issues.apache.org/jira/browse/CB-6890
             Project: Apache Cordova
          Issue Type: Bug
          Components: Android, Plugin File, Plugin File Transfer, Plugin Media 
Capture
    Affects Versions: 4.0.0
            Reporter: Ian Clelland
            Assignee: Ian Clelland


The field {{CordovaWebView.pluginManager}} was changed from a public field to a 
getter, {{getPluginManager()}}, for Cordova-Android v4.0.0. (to support 
pluggable webviews)

This means that code in plugins like this:

{code}
PluginManager pm = webView.pluginManager;
{code}

will break. However, the replacement code,

{code}
PluginManager pm = webView.getPluginManager();
{code}

will break on existing 3.x versions of Cordova.

The solution is to use reflection in the plugin to determine whether the method 
or the field is available, and to use the appropriate access method to get the 
plugin manager. This code works in both old and new versions of Cordova:

{code}
Class webViewClass = webView.getClass();
PluginManager pm = null;
try {
    Method gpm = webViewClass.getMethod("getPluginManager");
    pm = (PluginManager) gpm.invoke(webView);
} catch (NoSuchMethodException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
if (pm == null) {
    try {
        Field pmf = webViewClass.getField("pluginManager");
        pm = (PluginManager)pmf.get(webView);
    } catch (NoSuchFieldException e) {
    } catch (IllegalAccessException e) {
    }
}
{code}



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