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[英]How to get a value from onPostExecute() to if I have a separate class that extends an <AsyncTask> class?
[英]Android, can I put AsyncTask in a separate class and have a callback?
我只是在學習AsyncTask並希望將它用作一個單獨的類,而不是一個子類。
例如,
class inetloader extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String response = "";
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(urls[0]);
try {
HttpResponse execute = client.execute(httpGet);
InputStream content = execute.getEntity().getContent();
BufferedReader buffer = new BufferedReader(
new InputStreamReader(content));
String s = "";
while ((s = buffer.readLine()) != null) {
response += s;
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
@Override
protected void onPostExecute(String result) {
Log.e("xx",result);
// how do I pass this result back to the thread, that created me?
}
}
和主(ui)線程:
inetloader il = new inetloader();
il.execute("http://www.google.com");
//il.onResult()
//{
///do something...
//}
謝謝!
使用界面。 就像是:
interface CallBackListener{
public void callback();
}
然后在UI線程中執行此操作:
inetloader il = new inetloader();
li.setListener(this);
il.execute("http://www.google.com");
在inetloader中,添加:
CallBackListener mListener;
public void setListener(CallBackListener listener){
mListener = listener;
}
然后在postExecute()中,執行:
mListener.callback();
你可以將活動實例傳遞給構造函數並從那里調用活動函數...
喜歡使用界面:
public interface ResultUpdatable {
public void setResult(Object obj);
}
在Activity中實現它並傳入Async任務的構造函數,並使用setResult
函數從onPostExecute
更新結果。
inetloader il = new inetloader();
il.execute("http://www.google.com");
String result = il.get();//put it in try-catch
^^^^^^^^
here you get result which is in onPostExecute(String result)
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