android收藏夹功能,android – 在列表视图中添加收藏夹按钮

我有一个listview,每个列表项都有一个收藏夹按钮,点击后应该将列表项添加到另一个名为my fav9rites的活动中.我使用Baseadapter作为listview,使用Sharedpreference添加收藏夹.

当我单击收藏夹按钮时,列表视图项目将添加到我的收藏夹活动中,但我遇到以下问题：

1)单击时的收藏夹按钮应变暗,表示列表项已添加到收藏夹.发生这种情况但是当我关闭活动并再次返回时,按钮会恢复而不是变暗

2)在我的收藏夹活动中长按列表项目时,应从收藏夹中删除列表项,但这不会发生.

希望大家都明白我的问题

我的代码

我的基础适配器

public View getView(final int position, View view, ViewGroup parent)

{

final ViewHolder holder;

if(view == null){

holder = new ViewHolder();

view = inflater.inflate(R.layout.beg_list_item,null);

holder.listHeading = (TextView) view.findViewById(R.id.beg_list_itemTextView);

// holder.listHash = (TextView) view.findViewById(R.id.listview_hashtags);

holder.alphabetList = (ImageView) view.findViewById(R.id.beg_list_itemImageView);

holder.favoriteImg = (ImageView) view.findViewById(R.id.favbtn);

view.setTag(holder);

}else{

holder = (ViewHolder) view.getTag();

}

CodeList code = (CodeList) getItem(position);

holder.listHeading.setText(codeList.get(position).getListHeading());

imageLoader.DisplayImage(codeList.get(position).getAlphabetimg(),

holder.alphabetList);

// holder.listHash.setText(codeList.get(position).getListHashTags());

if (checkFavoriteItem(code)) {

holder.favoriteImg.setImageResource(R.drawable.favorite);

holder.favoriteImg.setTag("yes");

} else {

holder.favoriteImg.setImageResource(R.drawable.unfavorite);

holder.favoriteImg.setTag("no");

}

view.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View arg0){

Intent intent = new Intent(context, SingleItemView.class);

//intent.putExtra("listheading",

// (codeList.get(position).getListHeading()));

//intent.putExtra("alphabetimg",

// (codeList.get(position).getAlphabetimg()));

intent.putExtra("demovideo",

(codeList.get(position).getDailogdemovideo()));

intent.putExtra("download",

(codeList.get(position).getDownloadCode()));

// Start SingleItemView Class

context.startActivity(intent);

}

});

final ImageView favoritesbutton = (ImageView) view.findViewById(R.id.favbtn);

favoritesbutton.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v){

String tag = favoritesbutton.getTag().toString();

if(tag.equalsIgnoreCase("no")){

shrdPrefence.addFavorite(context, codeList.get(position));

Toast.makeText(context, R.string.fav_added, Toast.LENGTH_SHORT).show();

favoritesbutton.setTag("yes");

favoritesbutton.setImageResource(R.drawable.favorite);

}else{

shrdPrefence.removeFavorite(context, codeList.get(position));

favoritesbutton.setTag("no");

favoritesbutton.setImageResource(R.drawable.unfavorite);

Toast.makeText(context, R.string.fav_removed, Toast.LENGTH_SHORT).show();

}

}

});

return view;

}

//Checks whether a particular product exists in SharedPreferences*/

public boolean checkFavoriteItem(CodeList checkCode) {

boolean check = false;

List favorites = shrdPrefence.getFavorites(context);

if (favorites != null) {

for (CodeList code : favorites) {

if (code.equals(checkCode)) {

check = true;

break;

}

}

}

return check;

}

public void add(CodeList code) {

codeList.add(code);

notifyDataSetChanged();

}

public void remove(CodeList code) {

codeList.remove(code);

notifyDataSetChanged();

}

sharedpreference.java

public class SharedPreference

{

public static final String PREFS_NAME = "MY_APP";

public static final String FAVORITES = "code_Favorite";

public SharedPreference(){

super();

}

public void saveFavorites(Context context, List favorites){

SharedPreferences settings;

Editor editor;

settings = context.getSharedPreferences(PREFS_NAME,

Context.MODE_PRIVATE);

editor = settings.edit();

Gson gson = new Gson();

String jsonFavorites = gson.toJson(favorites);

editor.putString(FAVORITES, jsonFavorites);

editor.commit();

}

public void addFavorite(Context context, CodeList code){

List favorites = getFavorites(context);

if(favorites == null)

favorites = new ArrayList();

favorites.add(code);

saveFavorites(context,favorites);

}

public void removeFavorite(Context context, CodeList code) {

ArrayList favorites = getFavorites(context);

if (favorites != null) {

favorites.remove(code);

saveFavorites(context, favorites);

}

}

public ArrayList getFavorites(Context context) {

SharedPreferences settings;

List favorites;

settings = context.getSharedPreferences(PREFS_NAME,

Context.MODE_PRIVATE);

if (settings.contains(FAVORITES)) {

String jsonFavorites = settings.getString(FAVORITES, null);

Gson gson = new Gson();

CodeList[] favoriteItems = gson.fromJson(jsonFavorites,

CodeList[].class);

favorites = Arrays.asList(favoriteItems);

favorites = new ArrayList(favorites);

} else

return null;

return (ArrayList) favorites;

}

}

我最喜欢的..java

public class MyFavActivity extends Activity

{

SharedPreference shrdPrfence;

List favorites;

FinalAdapter fnlAdpter;

Context context = this.context;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.fav_layout);

shrdPrfence = new SharedPreference();

favorites = shrdPrfence.getFavorites(MyFavActivity.this);

if(favorites == null){

Dialog dialog = new Dialog(MyFavActivity.this);

dialog.setTitle(R.string.nofav_title);

dialog.show();

}else{

if(favorites.size() == 0){

Dialog dialog = new Dialog(MyFavActivity.this);

dialog.setTitle(R.string.nofav_title);

dialog.show();

}

ListView favList = (ListView) findViewById(R.id.fav_layoutListView);

if(favorites != null){

fnlAdpter = new FinalAdapter(MyFavActivity.this, favorites);

favList.setAdapter(fnlAdpter);

favList.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView> parent, View arg1,

int position, long arg3) {

}

});

favList.setOnItemLongClickListener(new OnItemLongClickListener() {

@Override

public boolean onItemLongClick(AdapterView> parent, View view,

int position, long id) {

ImageView button = (ImageView) view

.findViewById(R.id.favbtn);

String tag = button.getTag().toString();

if (tag.equalsIgnoreCase("no")) {

shrdPrfence.addFavorite(MyFavActivity.this,

favorites.get(position));

Toast.makeText(

MyFavActivity.this,

R.string.fav_added,

Toast.LENGTH_SHORT).show();

button.setTag("yes");

button.setImageResource(R.drawable.favorite);

} else {

shrdPrfence.removeFavorite(MyFavActivity.this,

favorites.get(position));

button.setTag("no");

button.setImageResource(R.drawable.unfavorite);

fnlAdpter.remove(favorites.get(position));

Toast.makeText(

MyFavActivity.this,

R.string.fav_removed,

Toast.LENGTH_SHORT).show();

}

return true;

}

});

}

}

}

}