我正在使用此代码/概念：
我想要实现的是，在选择的项目上（如下所示），我想将项目发送到服务器，让它在那一侧处理（我可以做）并检索String发回并使用该字符串更新列表/详细信息片段的详细信息部分。是否有人通过一些代码帮助我实现这一目标？
到目前为止我的代码如下：
public class MainActivity extends FragmentActivity implements HeadlinesFragment.OnHeadlineSelectedListener
{
XMLCreator x = new XMLCreator();
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null)
{
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null)
{
return;
}
// Create an instance of ExampleFragment
HeadlinesFragment firstFragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
firstFragment.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
postToServer();
}
public void postToServer()
{
new Connection().execute();
}
public void onArticleSelected(int position)
{
// The user selected the headline of an article from the HeadlinesFragment
// Capture the article fragment from the activity layout
ArticleFragment articleFrag = (ArticleFragment)getSupportFragmentManager().findFragmentById(R.id.article_fragment);
if (articleFrag != null)
{
// If article frag is available, we're in two-pane layout...
// Call a method in the ArticleFragment to update its content
String Day = "";
Day = Ipsum.Headlines[position];
Document doc;
try
{
doc = x.createDoc();
Element tutor = doc.createElement("Query");
tutor.appendChild(x.createDay(doc, Day, "GetSessionByDay"));
doc.appendChild(tutor);
String s = x.getStringFromDocument(doc);
//connection.sendData(s);
//Want to send and receive strings here
}
catch (Exception e)
{
e.printStackTrace();
}
articleFrag.updateArticleView(position);
}
else
{
// If the frag is not available, we're in the one-pane layout and must swap frags...
// Create fragment and give it an argument for the selected article
ArticleFragment newFragment = new ArticleFragment();
Bundle args = new Bundle();
args.putInt(ArticleFragment.ARG_POSITION, position);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
}
public class Connection extends AsyncTask<Void, Void, String>
{
// the I/O streams that will be receiving/sending data from/to the
// server
private ObjectOutputStream output;
private ObjectInputStream input;
private String message = "";
private Socket client;
@Override
protected void onPreExecute()
{
// IMPORTANT: this method is synched with UI thread, so can access UI
super.onPreExecute();
}
@Override
protected String doInBackground(Void... params)
{
try
{
client = new Socket("10.111.1.1", 5001);
} catch (UnknownHostException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
output = new ObjectOutputStream(client.getOutputStream());
output.flush();
input = new ObjectInputStream(client.getInputStream());
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
do
{
try
{
message = (String) input.readObject();
}
catch (ClassNotFoundException classNotFoundException)
{
} catch (OptionalDataException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
while (!message.equals("SERVER>>> TERMINATE"));
try
{
output.writeObject(message);
output.flush();
} catch (IOException ioException)
{
}
// sleep a bit, so this task isn't over before it starts
try
{
Thread.sleep(500);
} catch (InterruptedException e)
{
Log.e("TASK", "Error sleeping in CalculateTask");
}
// return value to be passed to onPostExecute of task initiator
return message;
}
@Override
protected void onProgressUpdate(Void... progress)
{
// IMPORTANT: this method is synched with UI thread, so can access UI
}
@Override
protected void onPostExecute(String result)
{
// IMPORTANT: this method is synched with UI thread, so can access UI
super.onPostExecute(result);
// update UI
}
}
}
答案 0 :(得分：0)
在postToServer()中创建方法MainActivity以执行AsyncTask。在片段
OnItemClickListner内调用此方法
((MainActivity)getActivity).postToServer();
在Fragment中，创建一个处理UI更新的方法updateUI(String response)，并在Activity完成后从您的父AsyncTask调用此方法。在OnPostExecute();
AsyncTask中调用此方法
答案 1 :(得分：0)
只需在方法getData()中调用Fragment中的服务器，我认为你必须实现AsynkTask。当您在DoInBackground()中收到该请求的回复时，只需将其传递给onPostExecute()并使用该响应并根据需要更新您的UI。