我是Android上的初學者,我正在創建一個電影應用程序,用戶可以在其中瀏覽電影並搜索最受歡迎或最受歡迎的電影。 我使用DetailsFragment顯示電影的細節,還我使用的可擴展列表視圖中顯示影片的預告片和評論無法從靜態上下文中引用Android
我的問題是,我在這條線得到一個錯誤 listAdapter =新ExpandableListAdapter(這一點,listDataHeader ,listDataChild);
,說:這不能從靜態上下文引用,我不能使用getActivity()或DetailsFragment.this
很抱歉,如果我是極端無能,但我搜索,我沒能解決它瞭解如何解決它。謝謝。
這裏是DetailsFragment.java
package com.example.android.movies;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ToggleButton;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import static com.example.android.movies.R.id.favoriteButton;
import static com.example.android.movies.R.id.iv_poster;
/**
* A placeholder fragment containing a simple view.
*/
public class DetailsFragment extends Fragment{
static Long id;
String title, overview, poster, date;
String vote;
ImageView posterIV;
TextView titleTV, dateTV, overviewTV, voteTV;
static Context mContext;
static ExpandableListAdapter listAdapter;
static ExpandableListView expListView;
static List<String> listDataHeader;
static HashMap<String, List<Trailers>> listDataChild;
static ArrayList<Trailers> arrTrailers;
static ArrayList<Trailers> arrReviews;
ToggleButton favorite;
private MoviesDB db;
Trailers t;
public static DetailsFragment newInstance() {
return new DetailsFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_details, container, false);
// get the listview
expListView = (ExpandableListView) rootView.findViewById(R.id.lvExp);
// receiving intent
Intent gIntent = getActivity().getIntent();
Movies movie = null;
if (gIntent != null && gIntent.hasExtra("movie")) {
movie = gIntent.getParcelableExtra("movie");
id = movie.getMposter_id();
title = movie.getMtitle();
titleTV = (TextView) rootView.findViewById(R.id.tv_title);
titleTV.setText(title);
date=movie.getMdate();
dateTV = (TextView) rootView.findViewById(R.id.tv_date);
dateTV.setText(date);
vote=String.valueOf(movie.getMvote());
voteTV= (TextView) rootView.findViewById(R.id.tv_vote);
voteTV.setText(vote);
overview=movie.getMoverview();
overviewTV = (TextView) rootView.findViewById(R.id.tv_overview);
overviewTV.setText(overview);
poster = movie.getMposter_path();
posterIV = (ImageView) rootView.findViewById(iv_poster);
Picasso.with(getActivity())
.load("http://image.tmdb.org/t/p/w185".concat(poster)).into(posterIV);
favorite= (ToggleButton) rootView.findViewById(favoriteButton);
}
favorite.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
db.insert(id,title,poster,date, Double.parseDouble(vote),overview,t.getContent1());
}
});
return rootView;
}
private static void settingAdapter() {
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
}
/*
* Preparing the list data
*/
private static void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<Trailers>>();
// Adding child data
listDataHeader.add("Reviews");
listDataHeader.add("Trailers");
listDataChild.put(listDataHeader.get(0), arrReviews); // Header, Child data
listDataChild.put(listDataHeader.get(1), arrTrailers);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mContext=getActivity();
new TrailersFetcher(getActivity(), id).execute();
}
public static void updateTrailers(ArrayList<Trailers> trailers){
arrTrailers = new ArrayList<>();
for (int i = 0; i <trailers.size() ; i++) {
arrTrailers.add(trailers.get(i));
}
new ReviewsFetcher(mContext, id).execute();
}
public static void updateReviews(ArrayList<Trailers> reviews){
arrReviews = new ArrayList<>();
for (int i = 0; i <reviews.size() ; i++) {
arrReviews.add(reviews.get(i));
}
settingAdapter();
}
}
你不能用靜態的背景下,因爲這會導致MemoryLeakException在你的應用程序 –
爲什麼它是靜態的第一位? – yanivtwin
其次,你已經創建了自己的ExpandableListAdapter ..即創建一個新的類,並使用BaseExpandableListAdapter擴展它,然後使用它..看看它http://androidexample.com/Custom_Expandable_ListView_Tutorial_-_Android_Example/index.php?view=article_discription&aid = 107 –