加速autoTextView android

Question

我有一个自动文本视图，可以从Web服务获取数据。我已经实现了TextChangedListener。从互联网上获取数据。每次在Textchanged上新的字符都是get和on afterTextChanged AsyncTask被调用。我想让它快速，因为如果用户手动输入文本...需要很长时间才能获取一些新数据。

textView.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2,
                int arg3) {

            seq = cs;

        }

        @Override
        public void beforeTextChanged(CharSequence s, int arg1, int arg2,
                int arg3)
        {

        }

        @Override
        public void afterTextChanged(Editable arg0)
        {
            new SearchTask().execute(seq.toString().trim());
        }
    });

AsyncTask是..

private class SearchTask extends AsyncTask<CharSequence, Void, String> 
{

    ArrayAdapter<String> adapter;

    String[] array;

    @Override
    protected void onPreExecute() 
    {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(CharSequence... params) 
    {
        try {
            HttpClient httpclient = new DefaultHttpClient();

            HttpPost httppost = new HttpPost(pak_url + params[0]);

            HttpResponse responce = httpclient.execute(httppost);

            HttpEntity httpEntity = responce.getEntity();

            String response = EntityUtils.toString(httpEntity);

            Log.d("response is", response);

            if (response != null) {
                String substr = response.split("\\(")[2].split("\\)")[0];

                array = substr.split(",");

                for (int i = 0; i < array.length; i++) {

                    array[i] = array[i].replace("'", "");
                }

            }

            return response;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);

        if (array != null) {
            adapter = new ArrayAdapter<String>(PlayListActivity.this,
                    android.R.layout.simple_list_item_1, array);

            textView.setAdapter(adapter);

            adapter.getFilter().filter(seq);
        } 
        /*else {
            Toast.makeText(PlayListActivity.this,
                    "Could not connect to server try again later...",
                    Toast.LENGTH_LONG).show();
        }*/
    }
}

Answer 1

您可以通过以下解决方案停止多个请求：

private SearchTask mAsync;

@Override
public void afterTextChanged(Editable arg0)
{
    if(mAsync!=null) {
        mAsync.cancel(true);
    }
    mAsync = new SearchTask().execute(seq.toString().trim());
}

现在你没有多次请求弄乱你的应用程序。

同时检查cancel()的{​​{3}}。摘录内容如下：

  

调用此方法将导致在onCancelled(Object)返回后在UI线程上调用doInBackground(Object[])。调用此方法可确保永远不会调用onPostExecute(Object)。调用此方法后，您应该定期检查isCancelled()从doInBackground(Object[])返回的值，以尽早完成任务。