Question

我正在尝试实现一个应用程序，在打开时，开始将联系人上传到localhost数据库（apache），同时显示进度指示器。我想将此作为异步任务。

到目前为止，这是我的代码，我对如何从这里开始感到失望。

主要活动：

public class MainActivity extends Activity{

private ProgressBar pb;

   private ProgressDialog progress;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      progress = new ProgressDialog(this);
   }


   public void open(View view){
      progress.setMessage("Downloading Contacts ");
      progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
      progress.setIndeterminate(true);
      progress.show();


class MyAsyncTask extends AsyncTask<String, Integer, Double>{

    @Override
    protected Double doInBackground(String... params) {
        // TODO Auto-generated method stub
        postData(params[0]);
        return null;
    }

    protected void onPostExecute(Double result){
        pb.setVisibility(View.GONE);
    }
    protected void onProgressUpdate(Integer... progress){
        pb.setProgress(progress[0]);
    }

    public void postData(String valueIWantToSend) {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(localhost/reg.php");

        try {
            // WHAT DO I ADD HERE?? A LITTLE CONFUSED ABOUT THIS PART TOO
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("myHttpData", valueIWantToSend));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);

        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
        } catch (IOException e) {
            // TODO Auto-generated catch block
        }
    }
    }
   }

}

Answer 1

程序你在做什么是错的。 PostExecute用于与用户界面交互以显示结果。 DoInBackground，您将执行高分析等操作，

PreExecute用于显示一些进度对话框以解析并显示结果。

请查看本教程。希望你能得到它。

Connect android through async task

使用HTTP POST上传联系人

1 个答案: