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我有一個從SQLite數據庫接收陣列的基礎轉接器：將圖像添加到自定義baseadapter
mHelper = new MyDbHelperContacts(this);
mDb = mHelper.getWritableDatabase();
Cursor c = null;
ArrayList<String> names=new ArrayList<String>() ;
c = mDb.rawQuery("SELECT realname FROM contacts",null);
c.moveToFirst();
if(c.getCount()>0){
do{
names.add(c.getString(0));
}while(c.moveToNext());
}
並將其填充到一個異步：
@Override
protected Void doInBackground(ArrayList<String>... params) {
mListItems.clear();
mListSectionPos.clear();
ArrayList<String> items = params[0];
if (mItems.size() > 0) {
// NOT forget to sort array
Collections.sort(items);
int i = 0;
String prev_section = "";
while (i < items.size()) {
String current_item = items.get(i).toString();
String current_section =
current_item.substring(0, 1).toUpperCase(Locale.getDefault());
if (!prev_section.equals(current_section)) {
mListItems.add(current_section);
mListItems.add(current_item);
// array list of section positions
mListSectionPos.add(mListItems.indexOf(current_section));
prev_section = current_section;
} else {
mListItems.add(current_item);
}
i++;
}
}
但我不知道我該怎麼爲每個條目添加圖像，請注意，圖像位於文件夾中，並且圖像的名稱屬於每個條目，例如，對於條目admin，圖像位於/storage/sdcard/pictures/admin_image1.jpg中。 所以我沒有任何問題綁定圖像到特定條目時，我有入口的名稱。
我需要的東西是我怎樣才能添加圖片到這個adapater，我在這裏發佈的主要活動和適配器代碼，對不起他們的時間過長的存在：
Cursor mCursor;
MyDbHelperContacts mHelper;
SQLiteDatabase mDb;
// unsorted list items
ArrayList<String> mItems;
// array list to store section positions
ArrayList<Integer> mListSectionPos;
// array list to store listView data
ArrayList<String> mListItems;
// custom list view with pinned header
PinnedHeaderListView mListView;
// custom adapter
PinnedHeaderAdapter mAdaptor;
// search box
EditText mSearchView;
// loading view
ProgressBar mLoadingView;
// empty view
TextView mEmptyView;
@SuppressWarnings("unchecked")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mHelper = new MyDbHelperContacts(this);
mDb = mHelper.getWritableDatabase();
Cursor c = null;
ArrayList<String> names=new ArrayList<String>() ;
c = mDb.rawQuery("SELECT realname FROM contacts",null);
c.moveToFirst();
if(c.getCount()>0){
do{
names.add(c.getString(0));
}while(c.moveToNext());
}
System.out.println(names);
// UI elements
setupViews();
// Array to ArrayList
mItems = names;
mListSectionPos = new ArrayList<Integer>();
mListItems = new ArrayList<String>();
// for handling configuration change
if (savedInstanceState != null) {
mListItems = savedInstanceState.getStringArrayList("mListItems");
mListSectionPos =
savedInstanceState.getIntegerArrayList("mListSectionPos");
if (mListItems != null && mListItems.size() > 0
&& mListSectionPos != null &&
mListSectionPos.size() > 0) {
setListAdaptor();
}
String constraint = savedInstanceState.getString("constraint");
if (constraint != null && constraint.length() > 0) {
mSearchView.setText(constraint);
setIndexBarViewVisibility(constraint);
}
} else {
new Poplulate().execute(mItems);
}
}
private void setupViews() {
setContentView(R.layout.main_act);
mSearchView = (EditText) findViewById(R.id.search_view);
mLoadingView = (ProgressBar) findViewById(R.id.loading_view);
mListView = (PinnedHeaderListView) findViewById(R.id.list_view);
mEmptyView = (TextView) findViewById(R.id.empty_view);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
mSearchView.addTextChangedListener(filterTextWatcher);
super.onPostCreate(savedInstanceState);
}
private void setListAdaptor() {
// create instance of PinnedHeaderAdapter and set adapter to list view
mAdaptor = new PinnedHeaderAdapter(this, mListItems, mListSectionPos);
mListView.setAdapter(mAdaptor);
LayoutInflater inflater = (LayoutInflater)
getSystemService(LAYOUT_INFLATER_SERVICE);
// set header view
View pinnedHeaderView =
inflater.inflate(R.layout.section_row_view,mListView, false);
mListView.setPinnedHeaderView(pinnedHeaderView);
// set index bar view
IndexBarView indexBarView = (IndexBarView)
inflater.inflate(R.layout.index_bar_view, mListView, false);
indexBarView.setData(mListView, mListItems, mListSectionPos);
mListView.setIndexBarView(indexBarView);
// set preview text view
View previewTextView = inflater.inflate(R.layout.preview_view,mListView,
false);
mListView.setPreviewView(previewTextView);
// for configure pinned header view on scroll change
mListView.setOnScrollListener(mAdaptor);
}
private TextWatcher filterTextWatcher = new TextWatcher() {
public void afterTextChanged(Editable s) {
String str = s.toString();
if (mAdaptor != null && str != null)
mAdaptor.getFilter().filter(str);
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
};
public class ListFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
// NOTE: this function is *always* called from a background thread,
// and
// not the UI thread.
String constraintStr =
constraint.toString().toLowerCase(Locale.getDefault());
FilterResults result = new FilterResults();
if (constraint != null && constraint.toString().length() > 0) {
ArrayList<String> filterItems = new ArrayList<String>();
synchronized (this) {
for (int i = 0; i < mItems.size(); i++) {
String item = mItems.get(i);
if
(item.toLowerCase(Locale.getDefault()).startsWith(constraintStr)) {
filterItems.add(item);
}
}
result.count = filterItems.size();
result.values = filterItems;
}
} else {
synchronized (this) {
result.count = mItems.size();
result.values = mItems;
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults
results) {
ArrayList<String> filtered = (ArrayList<String>) results.values;
setIndexBarViewVisibility(constraint.toString());
// sort array and extract sections in background Thread
new Poplulate().execute(filtered);
}
}
private void setIndexBarViewVisibility(String constraint) {
// hide index bar for search results
if (constraint != null && constraint.length() > 0) {
mListView.setIndexBarVisibility(false);
} else {
mListView.setIndexBarVisibility(true);
}
}
// sort array and extract sections in background Thread here we use
// AsyncTask
private class Poplulate extends AsyncTask<ArrayList<String>, Void, Void> {
private void showLoading(View contentView, View loadingView,
View emptyView) {
contentView.setVisibility(View.GONE);
loadingView.setVisibility(View.VISIBLE);
emptyView.setVisibility(View.GONE);
}
private void showContent(View contentView, View loadingView,
View emptyView) {
contentView.setVisibility(View.VISIBLE);
loadingView.setVisibility(View.GONE);
emptyView.setVisibility(View.GONE);
}
private void showEmptyText(View contentView, View loadingView,
View emptyView) {
contentView.setVisibility(View.GONE);
loadingView.setVisibility(View.GONE);
emptyView.setVisibility(View.VISIBLE);
}
@Override
protected void onPreExecute() {
// show loading indicator
showLoading(mListView, mLoadingView, mEmptyView);
super.onPreExecute();
}
@Override
protected Void doInBackground(ArrayList<String>... params) {
mListItems.clear();
mListSectionPos.clear();
ArrayList<String> items = params[0];
if (mItems.size() > 0) {
// NOT forget to sort array
Collections.sort(items);
int i = 0;
String prev_section = "";
while (i < items.size()) {
String current_item = items.get(i).toString();
String current_section = current_item.substring(0,
1).toUpperCase(Locale.getDefault());
if (!prev_section.equals(current_section)) {
mListItems.add(current_section);
mListItems.add(current_item);
// array list of section positions
mListSectionPos.add(mListItems.indexOf(current_section));
prev_section = current_section;
} else {
mListItems.add(current_item);
}
i++;
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
if (!isCancelled()) {
if (mListItems.size() <= 0) {
showEmptyText(mListView, mLoadingView, mEmptyView);
} else {
setListAdaptor();
showContent(mListView, mLoadingView, mEmptyView);
}
}
super.onPostExecute(result);
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
if (mListItems != null && mListItems.size() > 0) {
outState.putStringArrayList("mListItems", mListItems);
}
if (mListSectionPos != null && mListSectionPos.size() > 0) {
outState.putIntegerArrayList("mListSectionPos", mListSectionPos);
}
String searchText = mSearchView.getText().toString();
if (searchText != null && searchText.length() > 0) {
outState.putString("constraint", searchText);
}
super.onSaveInstanceState(outState);
}
}
，這是適配器：
// Customized adaptor to populate data in PinnedHeaderListView
public class PinnedHeaderAdapter extends BaseAdapter implements OnScrollListener,
IPinnedHeader, Filterable {
private static final int TYPE_ITEM = 0;
private static final int TYPE_SECTION = 1;
private static final int TYPE_MAX_COUNT = TYPE_SECTION + 1;
LayoutInflater mLayoutInflater;
int mCurrentSectionPosition = 0, mNextSectionPostion = 0;
// array list to store section positions
ArrayList<Integer> mListSectionPos;
// array list to store list view data
ArrayList<String> mListItems;
// context object
Context mContext;
public PinnedHeaderAdapter(Context context, ArrayList<String>
listItems,ArrayList<Integer> listSectionPos) {
this.mContext = context;
this.mListItems = listItems;
this.mListSectionPos = listSectionPos;
mLayoutInflater = (LayoutInflater)
mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mListItems.size();
}
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public boolean isEnabled(int position) {
return !mListSectionPos.contains(position);
}
@Override
public int getViewTypeCount() {
return TYPE_MAX_COUNT;
}
@Override
public int getItemViewType(int position) {
return mListSectionPos.contains(position) ? TYPE_SECTION : TYPE_ITEM;
}
@Override
public Object getItem(int position) {
return mListItems.get(position);
}
@Override
public long getItemId(int position) {
return mListItems.get(position).hashCode();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
int type = getItemViewType(position);
switch (type) {
case TYPE_ITEM:
convertView = mLayoutInflater.inflate(R.layout.row_view,
null);
break;
case TYPE_SECTION:
convertView =
mLayoutInflater.inflate(R.layout.section_row_view, null);
break;
}
holder.textView = (TextView)
convertView.findViewById(R.id.row_title);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(mListItems.get(position).toString());
return convertView;
}
@Override
public int getPinnedHeaderState(int position) {
// hide pinned header when items count is zero OR position is less than
// zero OR
// there is already a header in list view
if (getCount() == 0 || position < 0 || mListSectionPos.indexOf(position)
!= -1) {
return PINNED_HEADER_GONE;
}
// the header should get pushed up if the top item shown
// is the last item in a section for a particular letter.
mCurrentSectionPosition = getCurrentSectionPosition(position);
mNextSectionPostion = getNextSectionPosition(mCurrentSectionPosition);
if (mNextSectionPostion != -1 && position == mNextSectionPostion - 1) {
return PINNED_HEADER_PUSHED_UP;
}
return PINNED_HEADER_VISIBLE;
}
public int getCurrentSectionPosition(int position) {
String listChar = mListItems.get(position).toString().substring(0,
1).toUpperCase(Locale.getDefault());
return mListItems.indexOf(listChar);
}
public int getNextSectionPosition(int currentSectionPosition) {
int index = mListSectionPos.indexOf(currentSectionPosition);
if ((index + 1) < mListSectionPos.size()) {
return mListSectionPos.get(index + 1);
}
return mListSectionPos.get(index);
}
@Override
public void configurePinnedHeader(View v, int position) {
// set text in pinned header
TextView header = (TextView) v;
mCurrentSectionPosition = getCurrentSectionPosition(position);
header.setText(mListItems.get(mCurrentSectionPosition));
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount,
int totalItemCount) {
if (view instanceof PinnedHeaderListView) {
((PinnedHeaderListView)
view).configureHeaderView(firstVisibleItem);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
@Override
public Filter getFilter() {
return ((MainActivity) mContext).new ListFilter();
}
public static class ViewHolder {
public TextView textView;
}
}
和XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<EditText
android:id="@+id/search_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:drawableLeft="@drawable/ic_search"
android:hint="@string/search_hint"
android:singleLine="true" />
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<include
layout="@layout/loading_empty_view"
/>
<com.example.listviewfilter.ui.PinnedHeaderListView
android:id="@+id/list_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollingCache="false" />
</FrameLayout>
</LinearLayout>
任何提示將是真正appreciatd