假设我有文本输入和输出以及要发布的按钮。所以，我将一些json（nameValuePairs）发布到给定的API。我知道如何通过Strict模式制作这个东西线程策略技巧，但是，我需要使用AsyncTask来使用ProgressBar。
public class MainActivity extends Activity {
//Toast.makeText(getBaseContext(), str_text_input, Toast.LENGTH_LONG).show();
public String URL = "someurl";
EditText text_input;
EditText output;
ProgressBar progressbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.user_interface);
text_input = (EditText) findViewById(R.id.text_input);
output = (EditText) findViewById(R.id.text_output);
progressbar = (ProgressBar) findViewById(R.id.progressBar);
progressbar.setVisibility(View.GONE);
}
public void button_called(View view) {
progressbar.setVisibility(View.VISIBLE);
String txt = text_input.getText().toString();
sendPostRequest(txt, "somecheckcode", Integer.toString(int1), Integer.toString(int2));
// Here I want result of posting http request = Response
output.setText(Response);
}
String sendPostRequest(String txt, String Code, String dir, String topic ) {
class SendPostReqAsyncTask extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
String text = params[0];
String code = params[1];
String direction = params[2];
String topics = params[3];
String finalResult = "";
//System.out.println("*** doInBackground ** paramUsername " + paramUsername + " paramPassword :" + paramPassword);
HttpClient httpClient = new DefaultHttpClient();
// In a POST request, we don't pass the values in the URL.
//Therefore we use only the web page URL as the parameter of the HttpPost argument
HttpPost httpPost = new HttpPost(URL);
// Because we are not passing values over the URL, we should have a mechanism to pass the values that can be
//uniquely separate by the other end.
//To achieve that we use BasicNameValuePair
//Things we need to pass with the POST request
BasicNameValuePair srctxt = new BasicNameValuePair("param1", text);
BasicNameValuePair chkcode = new BasicNameValuePair("param2", code);
BasicNameValuePair direct = new BasicNameValuePair("param3", direction);
BasicNameValuePair sbjbs = new BasicNameValuePair("param4", topics);
// We add the content that we want to pass with the POST request to as name-value pairs
//Now we put those sending details to an ArrayList with type safe of NameValuePair
List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();
nameValuePairList.add(srctxt);
nameValuePairList.add(chkcode);
nameValuePairList.add(direct);
nameValuePairList.add(sbjbs);
try {
// UrlEncodedFormEntity is an entity composed of a list of url-encoded pairs.
//This is typically useful while sending an HTTP POST request.
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nameValuePairList, HTTP.UTF_8);
// setEntity() hands the entity (here it is urlEncodedFormEntity) to the request.
httpPost.setEntity(urlEncodedFormEntity);
try {
// HttpResponse is an interface just like HttpPost.
//Therefore we can't initialize them
HttpResponse httpResponse = httpClient.execute(httpPost);
// According to the JAVA API, InputStream constructor do nothing.
//So we can't initialize InputStream although it is not an interface
InputStream inputStream = httpResponse.getEntity().getContent();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
StringBuilder stringBuilder = new StringBuilder();
String bufferedStrChunk = null;
while((bufferedStrChunk = bufferedReader.readLine()) != null){
stringBuilder.append(bufferedStrChunk);
}
finalResult = stringBuilder.toString();
return stringBuilder.toString();
} catch (ClientProtocolException cpe) {
System.out.println("First Exception of HttpResponese :" + cpe);
cpe.printStackTrace();
} catch (IOException ioe) {
System.out.println("Second Exception of HttpResponse :" + ioe);
ioe.printStackTrace();
}
} catch (UnsupportedEncodingException uee) {
System.out.println("An Exception given because of UrlEncodedFormEntity argument :" + uee);
uee.printStackTrace();
}
return finalResult;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
}
}
SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
sendPostReqAsyncTask.execute(txt, Code, dir, topic);
return "RESULT_I_WANTED";
}
答案 0 :(得分：1)
在activity中创建另一个方法来设置输出文本并获取输入字符串参数，如下所示。
public void setOutputText(String outputText) {
output.setText(outputText);
}
然后在AsyncTask的onPostExecute方法中调用此方法，如下所示。
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
setOutputText(result);
}
答案 1 :(得分：0)
public class MainActivity extends Activity {
//Toast.makeText(getBaseContext(), str_text_input, Toast.LENGTH_LONG).show();
public String URL = "someurl";
EditText text_input;
EditText output;
ProgressBar progressbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.user_interface);
text_input = (EditText) findViewById(R.id.text_input);
output = (EditText) findViewById(R.id.text_output);
progressbar = (ProgressBar) findViewById(R.id.progressBar);
progressbar.setVisibility(View.GONE);
}
public void button_called(View view) {
progressbar.setVisibility(View.VISIBLE);
String txt = text_input.getText().toString();
//sendPostRequest(txt, "somecheckcode", Integer.toString(int1), Integer.toString(int2));
// Here I want result of posting http request = Response
SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
sendPostReqAsyncTask.execute(txt, "somecheckcode", Integer.toString(int1), Integer.toString(int2));
}
void sendPostRequest(String response) {
output.setText(response);
}
class SendPostReqAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String text = params[0];
String code = params[1];
String direction = params[2];
String topics = params[3];
String finalResult = "";
//System.out.println("*** doInBackground ** paramUsername " + paramUsername + " paramPassword :" + paramPassword);
HttpClient httpClient = new DefaultHttpClient();
// In a POST request, we don't pass the values in the URL.
//Therefore we use only the web page URL as the parameter of the HttpPost argument
HttpPost httpPost = new HttpPost(URL);
// Because we are not passing values over the URL, we should have a mechanism to pass the values that can be
//uniquely separate by the other end.
//To achieve that we use BasicNameValuePair
//Things we need to pass with the POST request
BasicNameValuePair srctxt = new BasicNameValuePair("param1", text);
BasicNameValuePair chkcode = new BasicNameValuePair("param2", code);
BasicNameValuePair direct = new BasicNameValuePair("param3", direction);
BasicNameValuePair sbjbs = new BasicNameValuePair("param4", topics);
// We add the content that we want to pass with the POST request to as name-value pairs
//Now we put those sending details to an ArrayList with type safe of NameValuePair
List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();
nameValuePairList.add(srctxt);
nameValuePairList.add(chkcode);
nameValuePairList.add(direct);
nameValuePairList.add(sbjbs);
try {
// UrlEncodedFormEntity is an entity composed of a list of url-encoded pairs.
//This is typically useful while sending an HTTP POST request.
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nameValuePairList, HTTP.UTF_8);
// setEntity() hands the entity (here it is urlEncodedFormEntity) to the request.
httpPost.setEntity(urlEncodedFormEntity);
try {
// HttpResponse is an interface just like HttpPost.
//Therefore we can't initialize them
HttpResponse httpResponse = httpClient.execute(httpPost);
// According to the JAVA API, InputStream constructor do nothing.
//So we can't initialize InputStream although it is not an interface
InputStream inputStream = httpResponse.getEntity().getContent();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
StringBuilder stringBuilder = new StringBuilder();
String bufferedStrChunk = null;
while ((bufferedStrChunk = bufferedReader.readLine()) != null) {
stringBuilder.append(bufferedStrChunk);
}
finalResult = stringBuilder.toString();
return stringBuilder.toString();
} catch (ClientProtocolException cpe) {
System.out.println("First Exception of HttpResponese :" + cpe);
cpe.printStackTrace();
} catch (IOException ioe) {
System.out.println("Second Exception of HttpResponse :" + ioe);
ioe.printStackTrace();
}
} catch (UnsupportedEncodingException uee) {
System.out.println("An Exception given because of UrlEncodedFormEntity argument :" + uee);
uee.printStackTrace();
}
return finalResult;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
sendPostRequest(result);
}
}
}