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POHow to return anonymous List or ArrayList on AsyncTask in Android
 

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  1. POHow to return anonymous List or ArrayList on AsyncTask in Android
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    <p>I've 6 different type of <code>List</code> results after completing <code>AsyncTask</code>. And the <code>List</code> results are should be returned to an <code>Activity</code>. For example: <code>List&lt;A&gt;</code>, <code>List&lt;B&gt;</code>, <code>List&lt;C&gt;</code>, <code>List&lt;D&gt;</code>, <code>List&lt;E&gt;</code> and finally <code>List&lt;F&gt;</code>. </p> <p>This is my <code>AsyncTask</code>:</p> <pre class="lang-java prettyprint-override"><code>public class myAsync extends AsyncTask&lt;String, String, List&gt; { private List resultList; @Override protected List doInBackground(String... params) { //params[0] is url //params[1] is type callAPI api = new callAPI(params[0], params[1]); // According to type api decides type of List and generates return api.getJSON(); // returns a List which already parse JSON } @Override protected void onPostExecute(List result) { // Result is here now, may be 6 different List type. this.resultList = result } // returns result public List getResultList() { return this.resultList; } } </code></pre> <p>I'll call AsyncTask like this:</p> <pre class="lang-java prettyprint-override"><code>myAsync task = new myAsync(); task.execute(params); List myList = task.getResultList(); // type is uncertain Log.d("Tag", Integer.toString(myList.size()); </code></pre> <p>You know, I must point out the return type (Result) between &lt;> tags. If I choose specific type for <code>List</code>, it does not work for other types. </p> <p>Indeed, I already tried to return <code>List&lt;Object&gt;</code> and only <code>List</code> types. But doesn't worked. </p> <p>I don't want to use <strong>6 different <code>Async</code></strong>. Is it possible to solve this with an only <code>AsyncTask</code>? I guess I need anonymous List or something similiar not sure. Can anyone explain this?</p>
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    1. USMarvin Pinto
    1. USOgulcan Orhan
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    1. COYou can ignore <>, it won't be an error, it just warns you.
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      1. USkosa
    2. COYou mean I should use this definition: `AsyncTask<String, String, List>` . If it is, what's going to be return types? I already returned all types as a normal List, got an NullException error.
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      1. USOgulcan Orhan
    3. COPost stacktrace here, I suspect the NullPointer you are getting might be from somewhere else.
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