Databases
StackOverflow2013
Postsdbo
POAndroid: how to get an instance of a member field via reflection
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAndroid: how to get an instance of a member field via reflection
    primarykey
    data
    text
    <p>Here's a fairly convoluted question. I am trying to access the webviewcore instance member of a webview via reflection. I want a reference to the webviewcore that is used by my webview, so that i can invoke a method that the webviewcore uses. I have to do this via reflection because the public sdk does not let you access this class. I know using reflection to do this is discouraged but i've made my peace with that. </p> <p>I've read <a href="http://tutorials.jenkov.com/java-reflection/fields.html" rel="nofollow">here</a> that to achieve this i would do something like this:</p> <pre><code>Class aClass = MyObject.class Field field = aClass.getField("someField"); MyObject objectInstance = new MyObject(); Object value = field.get(objectInstance); field.set(objetInstance, value); </code></pre> <p>The problem with doing this (and maybe im misunderstanding this) is that it looks like i have to create a new instance of the WebViewCore to work with and then set it back to my instance. First and formost, am i understanding this correctly. If so, then can someone translate the code above to do what i am looking for it to do. If my understanding is incorrect, does anyone know how else i can access the WebViewCore of an instance of a webview?</p> <p>Thanks!</p> <p>EDIT: Due to confusion i will restate my question. I have an instance of a webview. That webview has a member field called 'mWebViewCore' which is an instance of the WebViewCore class. The WebViewCore has a member class called called TextSelectionData. I need to access the the TextSelectionData object via reflection. I know how to access fields and methods of the webview through reflection. So i can get mWebViewCore field, but i don't know how to take that field and access it's fields, methods, classes etc. The broadstrokes are take an instance of an object, find a specific field in that instance, and access the fields of that field.</p> <p>Sorry for the confusion. It come from my weak understanding of reflection, and partially from the fact that i didn't adequately understand WebViewCore class. here's where i've gotten to in the code:</p> <pre><code>Class c = mWebView.getClass(); try { Field webViewCoreField = c.getDeclaredField("mWebViewCore"); webViewCoreField.setAccessible(true); //how do i get the fields of webViewCoreField? } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USaamiri
    1. USaamiri
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAndroid: how to get an instance of a member field via reflection
      1. USMysticMagicϡ
      1. VTFavorite
    1. COThe argument to `Field.get` is the instance from which you're trying to retrieve the specified field. Why would you create a new one? Then you wouldn't get the one set on the instance you care about.
      singulars
      1. POAndroid: how to get an instance of a member field via reflection
      1. USDave Newton
    2. COI see; you're following Jenkiv's tutorial, and misunderstood it: that tutorial creates an instance of the class to retrieve the field from because there isn't an instance yet--you already *have* an instance.
      singulars
      1. POAndroid: how to get an instance of a member field via reflection
      1. USDave Newton
    3. COI have an instance of the webview, not the webviewcore. I want to access one of the webviewcore's fields. The webviewcore field is an object itself so i can't just set a value, because the value of that field is an object that i can't instantiate. I'm sorry if this is confusing. Could one of you provide some code on how to do this.
      singulars
      1. POAndroid: how to get an instance of a member field via reflection
      1. USaamiri
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload