Asynctask with HttpClient and Progressbar

Question

我试图让我的HttpClient与Asynctask工作，包括一个进度条。我已经有了Asynctask的代码:

private class httpClient extends AsyncTask<String, Boolean, String> {
private HttpClient httpClient = getHttpClient();
@Override
protected String doInBackground(String... params) {
    publishProgress(true); 
    // Do the usual httpclient thing to get the result
    return null;
} 
@Override 
protected void onProgressUpdate(Boolean... progress) { 
    // line below coupled with  
    //    getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS)  
    //    before setContentView  
    // will show the wait animation on the top-right corner 
    AndroidLogin.this.setProgressBarIndeterminateVisibility(progress[0]); 
} 
@Override 
protected void onPostExecute(String result) { 
    publishProgress(false); 
    // Do something with result in your activity 
} 
}

我的问题是如何在Asynctask中正确地放置下面的代码，并且进度条也在工作。有人能帮帮我吗?

/******* INPUT USERNAME AND PASSWORD *******/
        EditText uname = (EditText)findViewById(R.id.txt_username); // user input through EditText
        String username = uname.getText().toString();
        EditText pword = (EditText)findViewById(R.id.txt_password); // password input through EditText
        String password = pword.getText().toString();
/******* INSTANTIATE THE CUSTOM HTTPCLIENT *******/
        HttpClient httpClient = getHttpClient();
        HttpPost request = new HttpPost("https://xxx"); 
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
        nameValuePairs.add(new BasicNameValuePair("usr_name", username)); 
        nameValuePairs.add(new BasicNameValuePair("usr_password", password)); 
        request.setEntity(new UrlEncodedFormEntity(nameValuePairs));
/******* EXECUTE HTTPCLIENT *******/
        try  
        { 
        HttpResponse response = httpClient.execute(request); 
/******* READ CONTENT IN BUFFER *******/
        InputStream inputStreamActivity = response.getEntity().getContent();  
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStreamActivity));
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
        sb.append(line + "n");
        }
/******* CLOSE CONNECTION AND STREAM *******/
        System.out.println(sb);
            inputStreamActivity.close();
        httpClient.getConnectionManager().shutdown();

Answer 1

我找到解决办法了。我需要将Textfields包含到Asynctask中，以避免异常。

EditText uname = (EditText)findViewById(R.id.txt_username);
EditText pword = (EditText)findViewById(R.id.txt_password);

我决定使用ProgressDialog而不是Progressbar，需要添加以下内容:

//Create a Progressdialog
ProgressDialog pd = new ProgressDialog(MyApp.this);
@Override 
    protected void onPreExecute()  
    { 
        //Set the Progressdialog
        pd.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
        pd.setMessage("Getting data....");
                 }
 @Override
    protected void onProgressUpdate(Integer... args) { 
           //Update the Progressdialog
           pd.setProgress(args[0]); 
           } 
  @Override 
    protected void onPostExecute(String result) { 
        //Dismiss Progressdialog
        pd.dismiss();
                 }

就是这样. .

Answer 2

尝试使用onPreExecute for ProgressBar init和其他不重要的东西:

@Override
protected void onPreExecute() 
{
     publishProgress(true); 
}
@Override
protected String doInBackground(String... params)
{
     funtiontoallthatbigcodeorcodeitselfhere(); 
}
...