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package se.emilsjolander.stickylistheaders;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.SectionIndexer;
import android.widget.TextView;
/**
* @author Emil Sjölander
*/
public class TestBaseAdapter extends BaseAdapter implements
StickyListHeadersAdapter, SectionIndexer {
private final Context mContext;
private String[] mCountries;
private int[] mSectionIndices;
private Character[] mSectionLetters;
private LayoutInflater mInflater;
public TestBaseAdapter(Context context) {
mContext = context;
mInflater = LayoutInflater.from(context);
mCountries = context.getResources().getStringArray(R.array.countries);
mSectionIndices = getSectionIndices();
mSectionLetters = getSectionLetters();
}
private int[] getSectionIndices() {
ArrayList<Integer> sectionIndices = new ArrayList<Integer>();
char lastFirstChar = mCountries[0].charAt(0);
sectionIndices.add(0);
for (int i = 1; i < mCountries.length; i++) {
if (mCountries[i].charAt(0) != lastFirstChar) {
lastFirstChar = mCountries[i].charAt(0);
sectionIndices.add(i);
}
}
int[] sections = new int[sectionIndices.size()];
for (int i = 0; i < sectionIndices.size(); i++) {
sections[i] = sectionIndices.get(i);
}
return sections;
}
private Character[] getSectionLetters() {
Character[] letters = new Character[mSectionIndices.length];
for (int i = 0; i < mSectionIndices.length; i++) {
letters[i] = mCountries[mSectionIndices[i]].charAt(0);
}
return letters;
}
@Override
public int getCount() {
return mCountries.length;
}
@Override
public Object getItem(int position) {
return mCountries[position];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.test_list_item_layout, parent, false);
holder.text = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(mCountries[position]);
return convertView;
}
@Override
public View getHeaderView(int position, View convertView, ViewGroup parent) {
HeaderViewHolder holder;
if (convertView == null) {
holder = new HeaderViewHolder();
convertView = mInflater.inflate(R.layout.header, parent, false);
holder.text = (TextView) convertView.findViewById(R.id.text1);
convertView.setTag(holder);
} else {
holder = (HeaderViewHolder) convertView.getTag();
}
// set header text as first char in name
CharSequence headerChar = mCountries[position].subSequence(0, 1);
holder.text.setText(headerChar);
return convertView;
}
/**
* Remember that these have to be static, postion=1 should always return
* the same Id that is.
*/
@Override
public long getHeaderId(int position) {
// return the first character of the country as ID because this is what
// headers are based upon
return mCountries[position].subSequence(0, 1).charAt(0);
}
@Override
public int getPositionForSection(int section) {
if (section >= mSectionIndices.length) {
section = mSectionIndices.length - 1;
} else if (section < 0) {
section = 0;
}
return mSectionIndices[section];
}
@Override
public int getSectionForPosition(int position) {
for (int i = 0; i < mSectionIndices.length; i++) {
if (position < mSectionIndices[i]) {
return i - 1;
}
}
return mSectionIndices.length - 1;
}
@Override
public Object[] getSections() {
return mSectionLetters;
}
public void clear() {
mCountries = new String[0];
mSectionIndices = new int[0];
mSectionLetters = new Character[0];
notifyDataSetChanged();
}
public void restore() {
mCountries = mContext.getResources().getStringArray(R.array.countries);
mSectionIndices = getSectionIndices();
mSectionLetters = getSectionLetters();
notifyDataSetChanged();
}
class HeaderViewHolder {
TextView text;
}
class ViewHolder {
TextView text;
}
}
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