在我的应用程序中，我有2个片段，Fragment A和Fragment B.在这两个片段中我做了一些XML解析和填充listviews。我想为我的app实现一个启动画面。所以它在解析和填充期间显示列表视图和完成时完成。为此，我创建了一个SplashActivity活动。我已经在FragmentA上实现了asyntask并在preexecute部分调用了SplashActivity。现在，当应用启动SplashActivity时，我开始了。但是我无法在FragmentA的postexecute上完成这个活动。 getActivity（）。finishActivity（）不起作用。请帮助我解决这个问题，或者建议我在Fragment Activity上实现Splash屏幕的另一种方法。提前谢谢....
这是我的FragmentA =＆gt;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflating layout
View v = inflater
.inflate(R.layout.headlines_fragment, container, false);
return v;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Log.i("Tag", "onCreateView");
// We set clear listener
loading = (ProgressBar) getActivity().findViewById(R.id.progressBar1);
if (Headlines.headflag == "malayalam") {
urls = "http://www.abc.com/rssfeeds/19_18_17_25/1/rss.xml";
}
if (Headlines.headflag == "english") {
urls = "http://www.abc.com/en/rssfeeds/1_2_3_5/latest/rss.xml";
}
new ProgressAsyncTask().execute();
MainActivity.refresh.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
new ProgressAsyncTask().execute();
}
});
}
public void populate_listview() {
newsList = new ArrayList<HashMap<String, String>>();
// looping through all song nodes <song>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
newsList.add(map);
MarqueeStr = MarqueeStr + " *** " + Title[i];
}
}
public void StartProgress() {
new ProgressAsyncTask().execute();
}
public class ProgressAsyncTask extends AsyncTask<Void, Integer, Void> {
int myProgress;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
myProgress = 0;
Intent intent = new Intent(getActivity(), Splash.class);
startActivityForResult(intent, 5); //Here I called Splash Activity
loading.setVisibility(View.VISIBLE);
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
getActivity().finishActivity(5);// Here I tried to finish flash activity
if (Title == null) {
final AlertDialog.Builder alertbox = new AlertDialog.Builder(
getActivity());
alertbox.setMessage("Error in connection.Do you want to retry");
alertbox.setPositiveButton("retry",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// getActivity().finish();
// Intent intent = new Intent(getActivity(),
// MainActivity.class);
// startActivityForResult(intent,1);
}
});
alertbox.setNegativeButton("exit",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// getActivity().finish();
}
});
alertbox.show();
}
list = (GridView) getActivity().findViewById(R.id.grid);
// Getting adapter by passing xml data ArrayList
adapter = new HeadlinesAdapter(getActivity(), newsList);
list.setAdapter(adapter);
loading.setVisibility(View.INVISIBLE);
Typeface tf = Typeface.createFromAsset(getActivity().getAssets(),
"fonts/karthika.TTF");
MainActivity.flashnews.setText(MarqueeStr);
if (Headlines.headflag == "malayalam") {
MainActivity.flashnews.setTypeface(tf);
}
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent myintent = new Intent(
"com.abc.malayalam2headlinespodcast.PODCAST");
Bundle mybundle = new Bundle();
mybundle.putInt("number", position);
myintent.putExtras(mybundle);
startActivity(myintent);
}
});
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
parse();
if (Title != null) {
populate_listview();
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
}
}
public static void parse() {
//parsing done here
}
}
答案 0 :(得分：4)
您不应该将您的Splash实现为Activity，而应该DialogFragment。只需设置该对话框片段的样式，使其显示为全屏。
关于显示：
SplashDialogFragment splashDlg = new SplashDialogFragment();
splashDlg.show(getSupportFragmentManager(), "SplashScreen");
然后关闭：
SplashDialogFragment splashDlg = (SplashDialogFragment) getSupportFragmentManager().findByTag("SplashScreen");
splashDlg.dismiss();
答案 1 :(得分：1)
只是回答问题实际上是你的标题＆＃34;要从Fragment＆＃34;完成一项活动，它总是使用界面根据文档从Fragment到Activity进行交互的好方法： Communicating with Activity from Fragment。因此，必须始终在Fragment中声明一个接口，该接口将在您的活动中实现，如下所示：
public class SplashActivity extends Activity implements FragmentA.FragmentListenerCallback {
public void onFragmentInteraction() {
//finish your activity or do whatever you like
finish();
}
}
public class FragmentA extends Fragment {
private FragmentListenerCallback fragmentListenerCallback;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
fragmentListenerCallback = (FragmentListenerCallback) activity;
}
public interface FragmentListenerCallback {
void onFragmentInteraction();
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if(fragmentListenerCallback != null){
fragmentListenerCallback.onFragmentInteraction();
}
}
}