[英]Asynctask with HttpClient and Progressbar
我試圖讓我的HttpClient與Asynctask一起工作,包括一個進度條。 我已經有了Asynctask的代碼:
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
}
}
我的問題是如何在Asynctask中正確放置代碼,並且Progressbar也正常工作。 有人可以幫忙嗎?
/******* 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();
我得到了解決方案。 我需要將Textfields包含在Asynctask中,以避免異常。
EditText uname = (EditText)findViewById(R.id.txt_username);
EditText pword = (EditText)findViewById(R.id.txt_password);
我決定使用ProgressDialog而不是Progressbar,需要添加以下內容:
//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();
}
那就是..
嘗試使用onPreExecute for ProgressBar init以及其他不重要的東西:
@Override
protected void onPreExecute()
{
publishProgress(true);
}
@Override
protected String doInBackground(String... params)
{
funtiontoallthatbigcodeorcodeitselfhere();
}
...
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