StickyListHeaders的用法说明（带字母索引条），安卓framework面试题

if (this.mAreHeadersSticky != areHeadersSticky) {

this.mAreHeadersSticky = areHeadersSticky;

requestLayout();

}

}

public boolean getAreHeadersSticky() {

return mAreHeadersSticky;

}

@Override

public void setAdapter(ListAdapter adapter) {

if (this.isInEditMode()) {

super.setAdapter(adapter);

return;

}

if (adapter == null) {

mAdapter = null;

reset();

super.setAdapter(null);

return;

}

if (!(adapter instanceof StickyListHeadersAdapter)) {

throw new IllegalArgumentException(

“Adapter must implement StickyListHeadersAdapter”);

}

mAdapter = wrapAdapter(adapter);

reset();

super.setAdapter(this.mAdapter);

}

private AdapterWrapper wrapAdapter(ListAdapter adapter) {

AdapterWrapper wrapper;

if (adapter instanceof SectionIndexer) {

wrapper = new SectionIndexerAdapterWrapper(getContext(),

(StickyListHeadersAdapter) adapter);

} else {

wrapper = new AdapterWrapper(getContext(),

(StickyListHeadersAdapter) adapter);

}

wrapper.setDivider(mDivider);

wrapper.setDividerHeight(mDividerHeight);

wrapper.registerDataSetObserver(mDataSetChangedObserver);

wrapper.setOnHeaderClickListener(mAdapterHeaderClickListener);

return wrapper;

}

public StickyListHeadersAdapter getWrappedAdapter() {

return mAdapter == null ? null : mAdapter.mDelegate;

}

public View getWrappedView(int position) {

View view = getChildAt(position);

if ((view instanceof WrapperView))

return ((WrapperView) view).mItem;

return view;

}

@Override

protected void dispatchDraw(Canvas canvas) {

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO) {

scrollChanged(getFirstVisiblePosition());

}

positionSelectorRect();

if (!mAreHeadersSticky || mHeader == null) {

super.dispatchDraw(canvas);

return;

}

if (!mDrawingListUnderStickyHeader) {

mClippingRect

.set(0, mHeaderBottomPosition, getWidth(), getHeight());

canvas.save();

canvas.clipRect(mClippingRect);

}

super.dispatchDraw(canvas);

if (!mDrawingListUnderStickyHeader) {

canvas.restore();

}

drawStickyHeader(canvas);

}

private void positionSelectorRect() {

if (!mSelectorRect.isEmpty()) {

int selectorPosition = getSelectorPosition();

if (selectorPosition >= 0) {

int firstVisibleItem = fixedFirstVisibleItem(getFirstVisiblePosition());

View v = getChildAt(selectorPosition - firstVisibleItem);

if (v instanceof WrapperView) {

WrapperView wrapper = ((WrapperView) v);

mSelectorRect.top = wrapper.getTop() + wrapper.mItemTop;

}

}

}

}

private int getSelectorPosition() {

if (mSelectorPositionField == null) { // not all supported andorid

// version have this variable

for (int i = 0; i < getChildCount(); i++) {

if (getChildAt(i).getBottom() == mSelectorRect.bottom) {

return i + fixedFirstVisibleItem(getFirstVisiblePosition());

}

}

} else {

try {

return mSelectorPositionField.getInt(this);

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

}

return -1;

}

private void drawStickyHeader(Canvas canvas) {

int headerHeight = getHeaderHeight();

int top = mHeaderBottomPosition - headerHeight;

// clip the headers drawing region

mClippingRect.left = getPaddingLeft();

mClippingRect.right = getWidth() - getPaddingRight();

mClippingRect.bottom = top + headerHeight;

mClippingRect.top = mClippingToPadding ? getPaddingTop() : 0;

canvas.save();

canvas.clipRect(mClippingRect);

canvas.translate(getPaddingLeft(), top);

mHeader.draw(canvas);

canvas.restore();

}

private void measureHeader() {

int widthMeasureSpec = MeasureSpec.makeMeasureSpec(getWidth()

• getPaddingLeft() - getPaddingRight()

• (isScrollBarOverlay() ? 0 : getVerticalScrollbarWidth()), MeasureSpec.EXACTLY);

int heightMeasureSpec = 0;

ViewGroup.LayoutParams params = mHeader.getLayoutParams();

if (params != null && params.height > 0) {

heightMeasureSpec = MeasureSpec.makeMeasureSpec(params.height,

MeasureSpec.EXACTLY);

} else {

heightMeasureSpec = MeasureSpec.makeMeasureSpec(0,

MeasureSpec.UNSPECIFIED);

}

mHeader.measure(widthMeasureSpec, heightMeasureSpec);

mHeader.layout(getPaddingLeft(), 0, getWidth()

• getPaddingRight(), mHeader.getMeasuredHeight());

}

private boolean isScrollBarOverlay() {

int scrollBarStyle = getScrollBarStyle();

return scrollBarStyle == SCROLLBARS_INSIDE_OVERLAY || scrollBarStyle == SCROLLBARS_OUTSIDE_OVERLAY;

}

private int getHeaderHeight() {

return mHeader == null ? 0 : mHeader.getMeasuredHeight();

}

@Override

public void setClipToPadding(boolean clipToPadding) {

super.setClipToPadding(clipToPadding);

mClippingToPadding = clipToPadding;

}

private void scrollChanged(int reportedFirstVisibleItem) {

Log.e(“parent”,“scrollChanged”);

int adapterCount = mAdapter == null ? 0 : mAdapter.getCount();

if (adapterCount == 0 || !mAreHeadersSticky) {

return;

}

final int listViewHeaderCount = getHeaderViewsCount();

final int firstVisibleItem = fixedFirstVisibleItem(reportedFirstVisibleItem)

• listViewHeaderCount;

if (firstVisibleItem < 0 || firstVisibleItem > adapterCount - 1) {

reset();

updateHeaderVisibilities();

invalidate();

return;

}

if (mHeaderPosition == null || mHeaderPosition != firstVisibleItem) {

mHeaderPosition = firstVisibleItem;

mCurrentHeaderId = mAdapter.getHeaderId(firstVisibleItem);

mHeader = mAdapter.getHeaderView(mHeaderPosition, mHeader, this);

measureHeader();

}

int childCount = getChildCount();

if (childCount != 0) {

View viewToWatch = null;

int watchingChildDistance = Integer.MAX_VALUE;

boolean viewToWatchIsFooter = false;

for (int i = 0; i < childCount; i++) {

final View child = super.getChildAt(i);

final boolean childIsFooter = mFooterViews != null

&& mFooterViews.contains(child);

final int childDistance = child.getTop()

• (mClippingToPadding ? getPaddingTop() : 0);

if (childDistance < 0) {

continue;

}

if (viewToWatch == null

|| (!viewToWatchIsFooter && !((WrapperView) viewToWatch)

.hasHeader())

|| ((childIsFooter || ((WrapperView) child).hasHeader()) && childDistance < watchingChildDistance)) {

viewToWatch = child;

viewToWatchIsFooter = childIsFooter;

watchingChildDistance = childDistance;

}

}

final int headerHeight = getHeaderHeight();

if (viewToWatch != null

&& (viewToWatchIsFooter || ((WrapperView) viewToWatch)

.hasHeader())) {

if (firstVisibleItem == listViewHeaderCount

&& super.getChildAt(0).getTop() > 0

&& !mClippingToPadding) {

mHeaderBottomPosition = 0;

} else {

final int paddingTop = mClippingToPadding ? getPaddingTop()

0;

mHeaderBottomPosition = Math.min(viewToWatch.getTop(),

headerHeight + paddingTop);

mHeaderBottomPosition = mHeaderBottomPosition < paddingTop ? headerHeight

• paddingTop

: mHeaderBottomPosition;

}

} else {

mHeaderBottomPosition = headerHeight

• (mClippingToPadding ? getPaddingTop() : 0);

}

}

updateHeaderVisibilities();

invalidate();

}

@Override

public void addFooterView(View v) {

super.addFooterView(v);

if (mFooterViews == null) {

mFooterViews = new ArrayList();

}

mFooterViews.add(v);

}

@Override

public boolean removeFooterView(View v) {

if (super.removeFooterView(v)) {

mFooterViews.remove(v);

return true;

}

return false;

}

private void updateHeaderVisibilities() {

int top = mClippingToPadding ? getPaddingTop() : 0;

int childCount = getChildCount();

for (int i = 0; i < childCount; i++) {

View child = super.getChildAt(i);

if (child instanceof WrapperView) {

WrapperView wrapperViewChild = (WrapperView) child;

if (wrapperViewChild.hasHeader()) {

View childHeader = wrapperViewChild.mHeader;

if (wrapperViewChild.getTop() < top) {

childHeader.setVisibility(View.INVISIBLE);

} else {

childHeader.setVisibility(View.VISIBLE);

}

}

}

}

}

private int fixedFirstVisibleItem(int firstVisibleItem) {

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {

return firstVisibleItem;

}

for (int i = 0; i < getChildCount(); i++) {

if (getChildAt(i).getBottom() >= 0) {

firstVisibleItem += i;

break;

}

}

// work around to fix bug with firstVisibleItem being to high because

// listview does not take clipToPadding=false into account

if (!mClippingToPadding && getPaddingTop() > 0) {

if (super.getChildAt(0).getTop() > 0) {

if (firstVisibleItem > 0) {

firstVisibleItem -= 1;

}

}

}

return firstVisibleItem;

}

public void setOnHeaderClickListener(

OnHeaderClickListener onHeaderClickListener) {

this.mOnHeaderClickListener = onHeaderClickListener;

}

public void setDrawingListUnderStickyHeader(

boolean drawingListUnderStickyHeader) {

mDrawingListUnderStickyHeader = drawingListUnderStickyHeader;

}

public boolean isDrawingListUnderStickyHeader() {

return mDrawingListUnderStickyHeader;

}

//----------注释-------------

// TODO handle touches better, multitouch etc.

@Override

public boolean onTouchEvent(MotionEvent ev) {

int action = ev.getAction();

if (action == MotionEvent.ACTION_DOWN

&& ev.getY() <= mHeaderBottomPosition) {

mHeaderDownY = ev.getY();

mHeaderBeingPressed = true;

mHeader.setPressed(true);

mHeader.invalidate();

invalidate(0, 0, getWidth(), mHeaderBottomPosition);

return true;

}

if (mHeaderBeingPressed) {

if (Math.abs(ev.getY() - mHeaderDownY) < mViewConfig

.getScaledTouchSlop()) {

if (action == MotionEvent.ACTION_UP

|| action == MotionEvent.ACTION_CANCEL) {

mHeaderDownY = -1;

mHeaderBeingPressed = false;

mHeader.setPressed(false);

mHeader.invalidate();

invalidate(0, 0, getWidth(), mHeaderBottomPosition);

if (mOnHeaderClickListener != null) {

mOnHeaderClickListener.onHeaderClick(this, mHeader,

mHeaderPosition, mCurrentHeaderId, true);

}

}

return true;

} else {

mHeaderDownY = -1;

mHeaderBeingPressed = false;

mHeader.setPressed(false);

mHeader.invalidate();

invalidate(0, 0, getWidth(), mHeaderBottomPosition);

}

}

return super.onTouchEvent(ev);

}

}

import android.view.View;

import android.view.ViewGroup;

import android.widget.ListAdapter;

public interface StickyListHeadersAdapter extends ListAdapter {

View getHeaderView(int position, View convertView, ViewGroup parent);

long getHeaderId(int position);

}

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.drawable.Drawable;

import android.os.Build;

import android.view.View;

import android.view.ViewGroup;

import android.view.ViewParent;

/**

*/

class WrapperView extends ViewGroup {

View mItem;

Drawable mDivider;

int mDividerHeight;

View mHeader;

int mItemTop;

public WrapperView(Context c) {

super©;

}

void update(View item, View header, Drawable divider, int dividerHeight) {

if (item == null) {

throw new NullPointerException(“List view item must not be null.”);

}

if (this.mItem != item) {

removeView(this.mItem);

this.mItem = item;

final ViewParent parent = item.getParent();

if(parent != null && parent != this) {

if(parent instanceof ViewGroup) {

((ViewGroup) parent).removeView(item);

}

}

addView(item);

}

if (this.mHeader != header) {

if (this.mHeader != null) {

removeView(this.mHeader);

}

this.mHeader = header;

if (header != null) {

addView(header);

}

}

if (this.mDivider != divider) {

this.mDivider = divider;

this.mDividerHeight = dividerHeight;

invalidate();

}

}

boolean hasHeader() {

return mHeader != null;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

int measuredWidth = MeasureSpec.getSize(widthMeasureSpec);

int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(measuredWidth,

MeasureSpec.EXACTLY);

int measuredHeight = 0;

//measure header or divider. when there is a header visible it acts as the divider

if (mHeader != null) {

LayoutParams params = mHeader.getLayoutParams();

if (params != null && params.height > 0) {

mHeader.measure(childWidthMeasureSpec,

MeasureSpec.makeMeasureSpec(params.height, MeasureSpec.EXACTLY));

} else {

mHeader.measure(childWidthMeasureSpec,

MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

}

measuredHeight += mHeader.getMeasuredHeight();

} else if (mDivider != null) {

measuredHeight += mDividerHeight;

}

//measure item

LayoutParams params = mItem.getLayoutParams();

if (params != null && params.height > 0) {

mItem.measure(childWidthMeasureSpec,

MeasureSpec.makeMeasureSpec(params.height, MeasureSpec.EXACTLY));

} else {

mItem.measure(childWidthMeasureSpec,

MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

}

measuredHeight += mItem.getMeasuredHeight();

setMeasuredDimension(measuredWidth, measuredHeight);

}

@Override

protected void onLayout(boolean changed, int l, int t, int r, int b) {

l = 0;

t = 0;

r = getWidth();

b = getHeight();

if (mHeader != null) {

int headerHeight = mHeader.getMeasuredHeight();

mHeader.layout(l, t, r, headerHeight);

mItemTop = headerHeight;

mItem.layout(l, headerHeight, r, b);

} else if (mDivider != null) {

mDivider.setBounds(l, t, r, mDividerHeight);

mItemTop = mDividerHeight;

mItem.layout(l, mDividerHeight, r, b);

} else {

mItemTop = t;

mItem.layout(l, t, r, b);

}

}

@Override

protected void dispatchDraw(Canvas canvas) {

super.dispatchDraw(canvas);

if (mHeader == null && mDivider != null) {

// Drawable.setBounds() does not seem to work pre-honeycomb. So have

// to do this instead

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {

canvas.clipRect(0, 0, getWidth(), mDividerHeight);

}

mDivider.draw(canvas);

}

}

}

import android.content.Context;

import android.widget.SectionIndexer;

class SectionIndexerAdapterWrapper extends

AdapterWrapper implements SectionIndexer {

final SectionIndexer mSectionIndexerDelegate;

SectionIndexerAdapterWrapper(Context context,

StickyListHeadersAdapter delegate) {

super(context, delegate);

mSectionIndexerDelegate = (SectionIndexer) delegate;

}

@Override

public int getPositionForSection(int section) {

return mSectionIndexerDelegate.getPositionForSection(section);

}

@Override

public int getSectionForPosition(int position) {

return mSectionIndexerDelegate.getSectionForPosition(position);

}

@Override

public Object[] getSections() {

return mSectionIndexerDelegate.getSections();

}

}

import android.content.Context;

import android.widget.Checkable;

/**

• A WrapperView that implements the checkable interface

• @author Emil Sjölander

*/

class CheckableWrapperView extends WrapperView implements Checkable {

public CheckableWrapperView(final Context context) {

super(context);

}

@Override

public boolean isChecked() {

return ((Checkable) mItem).isChecked();

}

@Override

public void setChecked(final boolean checked) {

((Checkable) mItem).setChecked(checked);

}

@Override

public void toggle() {

setChecked(!isChecked());

}

}

import java.util.LinkedList;

import java.util.List;

import android.content.Context;

import android.database.DataSetObserver;

import android.graphics.drawable.Drawable;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.Checkable;

import android.widget.ListAdapter;

/**

• A {@link ListAdapter} which wraps a {@link StickyListHeadersAdapter} and

• automatically handles wrapping the result of

• {@link StickyListHeadersAdapter#getView(int, View, ViewGroup)}

• and

• {@link StickyListHeadersAdapter#getHeaderView(int, View, ViewGroup)}

• appropriately.

• @author Jake Wharton (jakewharton@gmail.com)

*/

public class AdapterWrapper extends BaseAdapter implements StickyListHeadersAdapter {

public interface OnHeaderClickListener{

public void onHeaderClick(View header, int itemPosition, long headerId);

}

final StickyListHeadersAdapter mDelegate;

private final List mHeaderCache = new LinkedList();

private final Context mContext;

private Drawable mDivider;

private int mDividerHeight;

private OnHeaderClickListener mOnHeaderClickListener;

private DataSetObserver mDataSetObserver = new DataSetObserver() {

@Override

public void onInvalidated() {

mHeaderCache.clear();

AdapterWrapper.super.notifyDataSetInvalidated();

}

@Override

public void onChanged() {

AdapterWrapper.super.notifyDataSetChanged();

}

};

AdapterWrapper(Context context,

StickyListHeadersAdapter delegate) {

this.mContext = context;

this.mDelegate = delegate;

delegate.registerDataSetObserver(mDataSetObserver);

}

void setDivider(Drawable divider) {

this.mDivider = divider;

}

void setDividerHeight(int dividerHeight) {

this.mDividerHeight = dividerHeight;

}

@Override

public boolean areAllItemsEnabled() {

return mDelegate.areAllItemsEnabled();

}

@Override

public boolean isEnabled(int position) {

return mDelegate.isEnabled(position);

}

@Override

public int getCount() {

return mDelegate.getCount();

}

@Override

public Object getItem(int position) {

return mDelegate.getItem(position);

}

@Override

public long getItemId(int position) {

return mDelegate.getItemId(position);

}

@Override

public boolean hasStableIds() {

return mDelegate.hasStableIds();

}

@Override

public int getItemViewType(int position) {

return mDelegate.getItemViewType(position);

}

@Override

public int getViewTypeCount() {

return mDelegate.getViewTypeCount();

}

@Override

public boolean isEmpty() {

return mDelegate.isEmpty();

}

/**

• Will recycle header from {@link WrapperView} if it exists

*/

private void recycleHeaderIfExists(WrapperView wv) {

View header = wv.mHeader;

if (header != null) {

mHeaderCache.add(header);

}

}

/**

• Get a header view. This optionally pulls a header from the supplied

• {@link WrapperView} and will also recycle the divider if it exists.

*/

private View configureHeader(WrapperView wv, final int position) {

View header = wv.mHeader == null ? popHeader() : wv.mHeader;

header = mDelegate.getHeaderView(position, header, wv);

if (header == null) {

throw new NullPointerException(“Header view must not be null.”);

}

//if the header isn’t clickable, the listselector will be drawn on top of the header

header.setClickable(true);

header.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if(mOnHeaderClickListener != null){

long headerId = mDelegate.getHeaderId(position);

mOnHeaderClickListener.onHeaderClick(v, position, headerId);

}

}

});

return header;

}

private View popHeader() {

if(mHeaderCache.size() > 0) {

return mHeaderCache.remove(0);

}

return null;

}

private boolean previousPositionHasSameHeader(int position) {

return position != 0

&& mDelegate.getHeaderId(position) == mDelegate

.getHeaderId(position - 1);

}

@Override

public WrapperView getView(int position, View convertView, ViewGroup parent) {

WrapperView wv = (convertView == null) ? new WrapperView(mContext) : (WrapperView) convertView;

View item = mDelegate.getView(position, wv.mItem, wv);

View header = null;

if (previousPositionHasSameHeader(position)) {

recycleHeaderIfExists(wv);

} else {

header = configureHeader(wv, position);

}

if((item instanceof Checkable) && !(wv instanceof CheckableWrapperView)) {

// Need to create Checkable subclass of WrapperView for ListView to work correctly

wv = new CheckableWrapperView(mContext);

} else if(!(item instanceof Checkable) && (wv instanceof CheckableWrapperView)) {

wv = new WrapperView(mContext);

}

wv.update(item, header, mDivider, mDividerHeight);

return wv;

}

public void setOnHeaderClickListener(OnHeaderClickListener onHeaderClickListener){

this.mOnHeaderClickListener = onHeaderClickListener;

}

@Override

public boolean equals(Object o) {

return mDelegate.equals(o);

}

@Override

public View getDropDownView(int position, View convertView, ViewGroup parent) {

return ((BaseAdapter) mDelegate).getDropDownView(position, convertView, parent);

}

@Override

public int hashCode() {

return mDelegate.hashCode();

}

@Override

public void notifyDataSetChanged() {

((BaseAdapter) mDelegate).notifyDataSetChanged();

}

@Override

public void notifyDataSetInvalidated() {

((BaseAdapter) mDelegate).notifyDataSetInvalidated();

}

@Override

public String toString() {

return mDelegate.toString();

}

@Override

public View getHeaderView(int position, View convertView, ViewGroup parent) {

return mDelegate.getHeaderView(position, convertView, parent);

}

@Override

public long getHeaderId(int position) {

return mDelegate.getHeaderId(position);

}

}

上面的几个类大家直接建一个目录拷贝进去就行 下面开始写项目的代码

Activity

public class CitySelectListActivity extends Activity implements

StickyListHeadersListView.OnHeaderClickListener, AdapterView.OnItemClickListener

, StickyListHeadersListView.OnLoadingMoreLinstener {

CityLetterSortAdapter mAdapter;

StickyListHeadersListView stickyLV;

private static final String TAG = CitySelectListActivity.class.getSimpleName();

private CharacterParser mCharacterParser;

private List sourceDateFilterList = new ArrayList();

private EditText searchEt;

private List sourceDateList;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_city_select);

initView();

}

public void initView() {

mCharacterParser = CharacterParser.getInstance();

PinyinComparator pinyinComparator = new PinyinComparator();

sourceDateList = filledData(getResources().getStringArray(R.array.cities_data));

Collections.sort(sourceDateList, pinyinComparator);

mAdapter = new CityLetterSortAdapter(this, sourceDateList);

stickyLV = (StickyListHeadersListView) this.findViewById(R.id.stickyList);

stickyLV.setAdapter(mAdapter);

stickyLV.setOnItemClickListener(this);

stickyLV.setOnHeaderClickListener(this);

stickyLV.setLoadingMoreListener(this);

LetterSideBar letterSideBar = (LetterSideBar) findViewById(R.id.cs_letter_sb);

letterSideBar.setOnTouchingLetterChangedListener(

new LetterSideBar.OnTouchingLetterChangedListener() {

@Override

public void onTouchingLetterChanged(String letter) {

Logger.d(TAG, "onTouchingLetterChanged letter: " + letter);

int jumpPos = mAdapter.getPositionForSection(letter.charAt(0));

stickyLV.setSelection(jumpPos);

}

});

letterSideBar.setTextView((TextView) findViewById(R.id.cs_selected_letter_tv));

searchEt = (EditText) findViewById(R.id.cs_search_et);

searchEt.setVisibility(View.VISIBLE);

searchEt.addTextChangedListener(new TextWatcher() {

@Override

public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

}

@Override

public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

if (charSequence.toString().length() == 0) {

mAdapter.updateListView(sourceDateList);

mAdapter.notifyDataSetChanged();

} else {

String searchText = searchEt.getText().toString();

if (TextUtils.isEmpty(searchText)) {

SingleToast.show(getApplicationContext(), R.string.msg_keyword_is_empty);

}

sourceDateFilterList.clear();

for (int h = 0; h < sourceDateList.size(); h++) {

if (sourceDateList.get(h).getName().contains(searchText)) {

sourceDateFilterList.add(sourceDateList.get(h));

}

}

if (sourceDateFilterList.size() <= 0) {

// noFilterPhoneFriends();

} else {

mAdapter.updateListView(sourceDateFilterList);

mAdapter.notifyDataSetChanged();

}

}

}

@Override

public void afterTextChanged(Editable editable) {

}

});

}

private List filledData(String[] date) {

List mSortList = new ArrayList();

for (int i = 0, n = date.length; i < n; i++) {

SortModel sortModel = new SortModel();

sortModel.setName(date[i]);

String pinyin = mCharacterParser.getSelling(date[i]);

sortModel.setPinyin(pinyin);

String sortString = pinyin.substring(0, 1).toUpperCase();

if (sortString.matches(“[A-Z]”)) {

sortModel.setSortLetter(sortString.toUpperCase());

} else {

sortModel.setSortLetter(“#”);

}

mSortList.add(sortModel);

}

return mSortList;

}

@Override

public void OnLoadingMore() {

}

@Override

public void onHeaderClick(StickyListHeadersListView l, View header,

int itemPosition, long headerId, boolean currentlySticky) {

}

@Override

public void onItemClick(AdapterView<?> parent, View view, int position,

long id) {

String city = ((SortModel) mAdapter.getItem(position)).getName();

setResult(RESULT_OK, getIntent().putExtra(Constants.EXTRA_KEY_SELECT_CITY, city));

finish();

}

}

Adapter

import java.util.ArrayList;

import java.util.List;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.Filter;

import android.widget.Filterable;

import android.widget.SectionIndexer;

import android.widget.TextView;

import com.ccvideo.R;

import com.yizhibo.video.bean.SortModel;

import com.yizhibo.video.utils.Utils;

import com.yizhibo.video.view.stickylistview.StickyListHeadersAdapter;

public class CityLetterSortAdapter extends BaseAdapter

implements StickyListHeadersAdapter, SectionIndexer, Filterable {

private static final String TAG = CityLetterSortAdapter.class.getSimpleName();

private List mListAll = new ArrayList();

private List mList = null;

private Context mContext;

public CityLetterSortAdapter(Context mContext, List list) {

this.mContext = mContext;

this.mList = list;

mListAll.clear();

this.mListAll.addAll(list);

}

public void updateListView(List list) {

this.mList = list;

this.mListAll = list;

notifyDataSetChanged();

}

public int getCount() {

return this.mList.size();

}

public Object getItem(int position) {

return mList.get(position);

}

public long getItemId(int position) {

return position;

}

public View getView(final int position, View view, ViewGroup viewGroup) {

ViewHolder viewHolder = null;

if (view == null) {

viewHolder = new ViewHolder();

view = LayoutInflater.from(mContext).inflate(R.layout.item_city_letter_sort, viewGroup, false);

viewHolder.tvTitle = (TextView) view.findViewById(R.id.title);

view.setTag(viewHolder);

} else {

viewHolder = (ViewHolder) view.getTag();

}

if (position >= mList.size()) {

Utils.statisticError(TAG, “City list adapter size error !”);

return view;

}

viewHolder.tvTitle.setText(this.mList.get(position).getName());

return view;

}

@Override

public Filter getFilter() {

return new Filter() {

@Override

protected FilterResults performFiltering(CharSequence charSequence) {

FilterResults filterResults = new FilterResults();

ArrayList filterArrayName = new ArrayList();

String search = charSequence.toString().toLowerCase();

for (int i = 0, n = mListAll.size(); i < n; i++) {

String name = mListAll.get(i).getPinyin();

if (name.toLowerCase().startsWith(search)) {

filterArrayName.add(mListAll.get(i));

}

}

filterResults.count = filterArrayName.size();

filterResults.values = filterArrayName;

return filterResults;

}

@Override

protected void publishResults(CharSequence charSequence, FilterResults filterResults) {

mList.clear();

mList.addAll((List) filterResults.values);

notifyDataSetChanged();

}

};

}

@Override

public View getHeaderView(int position, View view, ViewGroup viewGroup) {

HeaderViewHolder hViewHolder;

if (view == null) {

hViewHolder = new HeaderViewHolder();

view = LayoutInflater.from(mContext).inflate(R.layout.item_sticky_header, viewGroup, false);

hViewHolder.tvLetter = (TextView) view.findViewById(R.id.sticky_header_letter_tv);

view.setTag(hViewHolder);

} else {

hViewHolder = (HeaderViewHolder) view.getTag();

}

hViewHolder.tvLetter.setText(mList.get(position).getSortLetter());

return view;

}

@Override

public long getHeaderId(int position) {

return mList.get(position).getSortLetter().subSequence(0, 1).charAt(0);

}

final static class HeaderViewHolder {

TextView tvLetter;

}

final static class ViewHolder {

TextView tvTitle;

}

/**

• 根据ListView的当前位置获取分类的首字母的Char ascii值

*/

public int getSectionForPosition(int position) {

return mList.get(position).getSortLetter().charAt(0);

}

/**

• 根据分类的首字母的Char ascii值获取其第一次出现该首字母的位置

*/

public int getPositionForSection(int section) {

for (int i = 0; i < getCount(); i++) {

String sortStr = mList.get(i).getSortLetter();

char firstChar = sortStr.toUpperCase().charAt(0);

if (firstChar == section) {

return i;

}

}

return -1;

}

/**

• 提取英文的首字母，非英文字母用#代替。

*/

private String getAlpha(String letter) {

String sortStr = letter.trim().substring(0, 1).toUpperCase();

// 正则表达式，判断首字母是否是英文字母

if (sortStr.matches(“[A-Z]”)) {

return sortStr;

} else {

return “#”;

}

}

@Override

public Object[] getSections() {

return null;

}

}

Layout

activity_city_select.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android=“http://schemas.android.com/apk/res/android”

android:fitsSystemWindows=“true”

android:layout_width=“match_parent”

android:layout_height=“match_parent”

android:orientation=“vertical”>

<EditText

android:id=“@+id/cs_search_et”

android:layout_width=“match_parent”

android:layout_height=“34dp”

android:layout_margin=“10dp”

android:paddingLeft=“5dp”

android:singleLine=“true”

android:imeOptions=“actionSearch”

android:layout_gravity=“center_vertical”

android:hint=“@string/city_select”

android:visibility=“gone”

android:drawableLeft=“@drawable/icon_search”

android:textSize=“12sp”

android:background=“@drawable/search_box_shape”/>

<com.yizhibo.video.view.stickylistview.StickyListHeadersListView

android:id=“@+id/stickyList”

android:layout_width=“match_parent”

android:layout_below=“@id/cs_search_et”

android:layout_height=“wrap_content”

android:cacheColorHint=“@android:color/transparent”

android:listSelector=“@drawable/list_item_selector”/>

<com.yizhibo.video.view.LetterSideBar

android:id=“@+id/cs_letter_sb”

android:layout_width=“20dp”

android:layout_height=“match_parent”

android:layout_below=“@id/cs_search_et”

android:layout_alignParentRight=“true”/>

<TextView

android:id=“@+id/cs_selected_letter_tv”

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_centerInParent=“true”

android:textSize=“60sp”

android:textColor=“@color/text_gray”/>

item_city_letter_sort.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android=“http://schemas.android.com/apk/res/android”

android:layout_width=“match_parent”

android:layout_height=“@dimen/list_item_video_limit_height”

android:paddingLeft=“9dp”

android:paddingRight=“15dp”

android:gravity=“center_vertical”

android:background=“@color/white”

android:orientation=“horizontal”>

<TextView

android:id=“@+id/title”

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_gravity=“center_vertical”

android:layout_marginLeft=“12dip”

android:gravity=“center_vertical”

android:paddingBottom=“10dip”

android:paddingTop=“10dip”

android:layout_weight=“1”

android:text=“”

android:textSize=“@dimen/text_size_13”

android:textColor=“@color/text_subtitle”/>

<TextView

android:id=“@+id/name_code_txv”

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_gravity=“center_vertical|right”

android:gravity=“right”

android:layout_weight=“1”

android:paddingRight=“10dip”

android:paddingBottom=“10dip”

android:paddingTop=“10dip”

android:text=“”

android:textSize=“@dimen/text_size_13”

android:textColor=“@color/text_subtitle”/>

LetterSideBar

package com.yizhibo.video.view;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Typeface;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.widget.TextView;

import com.ccvideo.*;

public class LetterSideBar extends View {

private OnTouchingLetterChangedListener onTouchingLetterChangedListener;

public static String[] mLetters = { “#”, “A”, “B”, “C”, “D”, “E”, “F”, “G”, “H”, “I”, “J”, “K”, “L”, “M”,

“N”, “O”, “P”, “Q”, “R”, “S”, “T”, “U”, “V”, “W”, “X”, “Y”, “Z”

};

private int mChooseIndex = -1;

private Paint mPaint = new Paint();

private TextView mTextDialog;

public LetterSideBar(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

public LetterSideBar(Context context, AttributeSet attrs) {

super(context, attrs);

}

public LetterSideBar(Context context) {

super(context);

}

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

int height = getHeight();

int width = getWidth();

int singleHeight = height / mLetters.length;

for (int i = 0; i < mLetters.length; i++) {

mPaint.setColor(Color.rgb(33, 65, 98));

// mPaint.setColor(Color.WHITE);

mPaint.setTypeface(Typeface.DEFAULT);

mPaint.setAntiAlias(true);

mPaint.setTextSize(30);

// Selected state

if (i == mChooseIndex) {

mPaint.setColor(getResources().getColor(R.color.text_common));

mPaint.setFakeBoldText(true);

}

float x = width / 2 - mPaint.measureText(mLetters[i]) / 2;

float y = singleHeight * i + singleHeight;

canvas.drawText(mLetters[i], x, y, mPaint);

mPaint.reset();

}

}

@Override

public boolean dispatchTouchEvent(MotionEvent event) {

final int action = event.getAction();

final float y = event.getY();

final int oldChooseIndex = mChooseIndex;

final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;

// 点击y坐标所占总高度的比例*b数组的长度就等于点击b中的个数.

final int chooseIndex = (int) (y / getHeight() * mLetters.length);

switch (action) {

case MotionEvent.ACTION_UP:

setBackgroundResource(android.R.color.transparent);

mChooseIndex = -1;//

invalidate();

if (mTextDialog != null) {

mTextDialog.setVisibility(View.INVISIBLE);

}

break;

default:

setBackgroundResource(R.color.black_alpha_percent_30);

if (oldChooseIndex != chooseIndex) {

if (chooseIndex >= 0 && chooseIndex < mLetters.length) {

if (listener != null) {

listener.onTouchingLetterChanged(mLetters[chooseIndex]);

}

if (mTextDialog != null) {

mTextDialog.setText(mLetters[chooseIndex]);

mTextDialog.setVisibility(View.VISIBLE);

}

mChooseIndex = chooseIndex;

invalidate();

}

}

break;

}

return true;

}

public void setTextView(TextView mTextDialog) {

this.mTextDialog = mTextDialog;

}

public void setOnTouchingLetterChangedListener(

OnTouchingLetterChangedListener onTouchingLetterChangedListener) {

this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;

}

public interface OnTouchingLetterChangedListener {

void onTouchingLetterChanged(String letter);

}

}

item_sticky_header.xml

<?xml version="1.0" encoding="utf-8"?>

<TextView

xmlns:android=“http://schemas.android.com/apk/res/android”

android:id=“@+id/sticky_header_letter_tv”

android:layout_width=“match_parent”

android:layout_height=“wrap_content”

android:background=“@color/default_line_color”

android:gravity=“center_vertical|left”

android:padding=“9dip”

android:text=“”

android:textColor=“@color/text_brown”

android:textSize=“@dimen/text_size_12”/>

SortModel.java

public class SortModel extends BaseSortModel {

private String name;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

CharacterParser.java

package com.yizhibo.video.utils;

/**

* Java汉字转换为拼音

*/

public class CharacterParser {

private static int[] pyvalue = new int[]{-20319, -20317, -20304, -20295, -20292, -20283, -20265, -20257, -20242, -20230, -20051, -20036, -20032,

-20026, -20002, -19990, -19986, -19982, -19976, -19805, -19784, -19775, -19774, -19763, -19756, -19751, -19746, -19741, -19739, -19728,

-19725, -19715, -19540, -19531, -19525, -19515, -19500, -19484, -19479, -19467, -19289, -19288, -19281, -19275, -19270, -19263, -19261,

-19249, -19243, -19242, -19238, -19235, -19227, -19224, -19218, -19212, -19038, -19023, -19018, -19006, -19003, -18996, -18977, -18961,

-18952, -18783, -18774, -18773, -18763, -18756, -18741, -18735, -18731, -18722, -18710, -18697, -18696, -18526, -18518, -18501, -18490,

-18478, -18463, -18448, -18447, -18446, -18239, -18237, -18231, -18220, -18211, -18201, -18184, -18183, -18181, -18012, -17997, -17988,

-17970, -17964, -17961, -17950, -17947, -17931, -17928, -17922, -17759, -17752, -17733, -17730, -17721, -17703, -17701, -17697, -17692,

-17683, -17676, -17496, -17487, -17482, -17468, -17454, -17433, -17427, -17417, -17202, -17185, -16983, -16970, -16942, -16915, -16733,

-16708, -16706, -16689, -16664, -16657, -16647, -16474, -16470, -16465, -16459, -16452, -16448, -16433, -16429, -16427, -16423, -16419,

-16412, -16407, -16403, -16401, -16393, -16220, -16216, -16212, -16205, -16202, -16187, -16180, -16171, -16169, -16158, -16155, -15959,

-15958, -15944, -15933, -15920, -15915, -15903, -15889, -15878, -15707, -15701, -15681, -15667, -15661, -15659, -15652, -15640, -15631,

-15625, -15454, -15448, -15436, -15435, -15419, -15416, -15408, -15394, -15385, -15377, -15375, -15369, -15363, -15362, -15183, -15180,

-15165, -15158, -15153, -15150, -15149, -15144, -15143, -15141, -15140, -15139, -15128, -15121, -15119, -15117, -15110, -15109, -14941,

-14937, -14933, -14930, -14929, -14928, -14926, -14922, -14921, -14914, -14908, -14902, -14894, -14889, -14882, -14873, -14871, -14857,

-14678, -14674, -14670, -14668, -14663, -14654, -14645, -14630, -14594, -14429, -14407, -14399, -14384, -14379, -14368, -14355, -14353,

-14345, -14170, -14159, -14151, -14149, -14145, -14140, -14137, -14135, -14125, -14123, -14122, -14112, -14109, -14099, -14097, -14094,

-14092, -14090, -14087, -14083, -13917, -13914, -13910, -13907, -13906, -13905, -13896, -13894, -13878, -13870, -13859, -13847, -13831,

-13658, -13611, -13601, -13406, -13404, -13400, -13398, -13395, -13391, -13387, -13383, -13367, -13359, -13356, -13343, -13340, -13329,

-13326, -13318, -13147, -13138, -13120, -13107, -13096, -13095, -13091, -13076, -13068, -13063, -13060, -12888, -12875, -12871, -12860,

-12858, -12852, -12849, -12838, -12831, -12829, -12812, -12802, -12607, -12597, -12594, -12585, -12556, -12359, -12346, -12320, -12300,

-12120, -12099, -12089, -12074, -12067, -12058, -12039, -11867, -11861, -11847, -11831, -11798, -11781, -11604, -11589, -11536, -11358,

-11340, -11339, -11324, -11303, -11097, -11077, -11067, -11055, -11052, -11045, -11041, -11038, -11024, -11020, -11019, -11018, -11014,

-10838, -10832, -10815, -10800, -10790, -10780, -10764, -10587, -10544, -10533, -10519, -10331, -10329, -10328, -10322, -10315, -10309,

-10307, -10296, -10281, -10274, -10270, -10262, -10260, -10256, -10254};

public static String[] pystr = new String[]{“a”, “ai”, “an”, “ang”, “ao”, “ba”, “bai”, “ban”, “bang”, “bao”, “bei”, “ben”, “beng”, “bi”, “bian”,

“biao”, “bie”, “bin”, “bing”, “bo”, “bu”, “ca”, “cai”, “can”, “cang”, “cao”, “ce”, “ceng”, “cha”, “chai”, “chan”, “chang”, “chao”, “che”,

“chen”, “cheng”, “chi”, “chong”, “chou”, “chu”, “chuai”, “chuan”, “chuang”, “chui”, “chun”, “chuo”, “ci”, “cong”, “cou”, “cu”, “cuan”,

“cui”, “cun”, “cuo”, “da”, “dai”, “dan”, “dang”, “dao”, “de”, “deng”, “di”, “dian”, “diao”, “die”, “ding”, “diu”, “dong”, “dou”, “du”,

“duan”, “dui”, “dun”, “duo”, “e”, “en”, “er”, “fa”, “fan”, “fang”, “fei”, “fen”, “feng”, “fo”, “fou”, “fu”, “ga”, “gai”, “gan”, “gang”,

“gao”, “ge”, “gei”, “gen”, “geng”, “gong”, “gou”, “gu”, “gua”, “guai”, “guan”, “guang”, “gui”, “gun”, “guo”, “ha”, “hai”, “han”, “hang”,

“hao”, “he”, “hei”, “hen”, “heng”, “hong”, “hou”, “hu”, “hua”, “huai”, “huan”, “huang”, “hui”, “hun”, “huo”, “ji”, “jia”, “jian”,

“jiang”, “jiao”, “jie”, “jin”, “jing”, “jiong”, “jiu”, “ju”, “juan”, “jue”, “jun”, “ka”, “kai”, “kan”, “kang”, “kao”, “ke”, “ken”,

“keng”, “kong”, “kou”, “ku”, “kua”, “kuai”, “kuan”, “kuang”, “kui”, “kun”, “kuo”, “la”, “lai”, “lan”, “lang”, “lao”, “le”, “lei”, “leng”,

“li”, “lia”, “lian”, “liang”, “liao”, “lie”, “lin”, “ling”, “liu”, “long”, “lou”, “lu”, “lv”, “luan”, “lue”, “lun”, “luo”, “ma”, “mai”,

“man”, “mang”, “mao”, “me”, “mei”, “men”, “meng”, “mi”, “mian”, “miao”, “mie”, “min”, “ming”, “miu”, “mo”, “mou”, “mu”, “na”, “nai”,

“nan”, “nang”, “nao”, “ne”, “nei”, “nen”, “neng”, “ni”, “nian”, “niang”, “niao”, “nie”, “nin”, “ning”, “niu”, “nong”, “nu”, “nv”, “nuan”,

“nue”, “nuo”, “o”, “ou”, “pa”, “pai”, “pan”, “pang”, “pao”, “pei”, “pen”, “peng”, “pi”, “pian”, “piao”, “pie”, “pin”, “ping”, “po”, “pu”,

“qi”, “qia”, “qian”, “qiang”, “qiao”, “qie”, “qin”, “qing”, “qiong”, “qiu”, “qu”, “quan”, “que”, “qun”, “ran”, “rang”, “rao”, “re”,

“ren”, “reng”, “ri”, “rong”, “rou”, “ru”, “ruan”, “rui”, “run”, “ruo”, “sa”, “sai”, “san”, “sang”, “sao”, “se”, “sen”, “seng”, “sha”,

“shai”, “shan”, “shang”, “shao”, “she”, “shen”, “sheng”, “shi”, “shou”, “shu”, “shua”, “shuai”, “shuan”, “shuang”, “shui”, “shun”,

“shuo”, “si”, “song”, “sou”, “su”, “suan”, “sui”, “sun”, “suo”, “ta”, “tai”, “tan”, “tang”, “tao”, “te”, “teng”, “ti”, “tian”, “tiao”,

“tie”, “ting”, “tong”, “tou”, “tu”, “tuan”, “tui”, “tun”, “tuo”, “wa”, “wai”, “wan”, “wang”, “wei”, “wen”, “weng”, “wo”, “wu”, “xi”,

“xia”, “xian”, “xiang”, “xiao”, “xie”, “xin”, “xing”, “xiong”, “xiu”, “xu”, “xuan”, “xue”, “xun”, “ya”, “yan”, “yang”, “yao”, “ye”, “yi”,

“yin”, “ying”, “yo”, “yong”, “you”, “yu”, “yuan”, “yue”, “yun”, “za”, “zai”, “zan”, “zang”, “zao”, “ze”, “zei”, “zen”, “zeng”, “zha”,

“zhai”, “zhan”, “zhang”, “zhao”, “zhe”, “zhen”, “zheng”, “zhi”, “zhong”, “zhou”, “zhu”, “zhua”, “zhuai”, “zhuan”, “zhuang”, “zhui”,

“zhun”, “zhuo”, “zi”, “zong”, “zou”, “zu”, “zuan”, “zui”, “zun”, “zuo”};

private StringBuilder buffer;

private String resource;

private static CharacterParser characterParser = new CharacterParser();

public static CharacterParser getInstance() {

return characterParser;

}

public String getResource() {

return resource;

}

public void setResource(String resource) {

this.resource = resource;

}

/**

* 汉字转成ASCII码 * * @param chs * @return

*/

private int getChsAscii(String chs) {

int asc = 0;

try {

byte[] bytes = chs.getBytes(“gb2312”);

if (bytes.length > 2 || bytes.length <= 0) {

throw new RuntimeException(“illegal resource string”);

}

if (bytes.length == 1) {

asc = bytes[0];

}

if (bytes.length == 2) {

int hightByte = 256 + bytes[0];

int lowByte = 256 + bytes[1];

asc = (256 * hightByte + lowByte) - 256 * 256;

}

} catch (Exception e) {

System.out.println(“ERROR:ChineseSpelling.class-getChsAscii(String chs)” + e);

}

return asc;

}

/**

* 单字解析 * * @param str * @return

*/

public String convert(String str) {

String result = null;

int ascii = getChsAscii(str);

if (ascii > 0 && ascii < 160) {

result = String.valueOf((char) ascii);

} else {

for (int i = (pyvalue.length - 1); i >= 0; i–) {

if (pyvalue[i] <= ascii) {

result = pystr[i];

break;

}

}

}

return result;

}

/**

* 词组解析 * * @param chs * @return

*/

public String getSelling(String chs) {

String key, value;

buffer = new StringBuilder();

for (int i = 0; i < chs.length(); i++) {

key = chs.substring(i, i + 1);

if (key.getBytes().length >= 2) {

value = convert(key);

if (value == null) {

value = “unknown”;
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CharacterParser getInstance() {

return characterParser;

}

public String getResource() {

return resource;

}

public void setResource(String resource) {

this.resource = resource;

}

/**

* 汉字转成ASCII码 * * @param chs * @return

*/

private int getChsAscii(String chs) {

int asc = 0;

try {

byte[] bytes = chs.getBytes(“gb2312”);

if (bytes.length > 2 || bytes.length <= 0) {

throw new RuntimeException(“illegal resource string”);

}

if (bytes.length == 1) {

asc = bytes[0];

}

if (bytes.length == 2) {

int hightByte = 256 + bytes[0];

int lowByte = 256 + bytes[1];

asc = (256 * hightByte + lowByte) - 256 * 256;

}

} catch (Exception e) {

System.out.println(“ERROR:ChineseSpelling.class-getChsAscii(String chs)” + e);

}

return asc;

}

/**

* 单字解析 * * @param str * @return

*/

public String convert(String str) {

String result = null;

int ascii = getChsAscii(str);

if (ascii > 0 && ascii < 160) {

result = String.valueOf((char) ascii);

} else {

for (int i = (pyvalue.length - 1); i >= 0; i–) {

if (pyvalue[i] <= ascii) {

result = pystr[i];

break;

}

}

}

return result;

}

/**

* 词组解析 * * @param chs * @return

*/

public String getSelling(String chs) {

String key, value;

buffer = new StringBuilder();

for (int i = 0; i < chs.length(); i++) {

key = chs.substring(i, i + 1);

if (key.getBytes().length >= 2) {

value = convert(key);

if (value == null) {

value = “unknown”;
自我介绍一下，小编13年上海交大毕业，曾经在小公司待过，也去过华为、OPPO等大厂，18年进入阿里一直到现在。

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[外链图片转存中…(img-RmBkJhyk-1712553856119)]

[外链图片转存中…(img-HLhsQVW3-1712553856120)]

[外链图片转存中…(img-hS3emSyF-1712553856120)]

[外链图片转存中…(img-ZpSjLDvw-1712553856121)]

[外链图片转存中…(img-KB9pQUXQ-1712553856121)]

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最后

其实Android开发的知识点就那么多，面试问来问去还是那么点东西。所以面试没有其他的诀窍，只看你对这些知识点准备的充分程度。so，出去面试时先看看自己复习到了哪个阶段就好。

上面分享的腾讯、头条、阿里、美团、字节跳动等公司2019-2021年的高频面试题，博主还把这些技术点整理成了视频和PDF（实际上比预期多花了不少精力），包含知识脉络 + 诸多细节，由于篇幅有限，上面只是以图片的形式给大家展示一部分。

【Android思维脑图（技能树）】

知识不体系？这里还有整理出来的Android进阶学习的思维脑图，给大家参考一个方向。

[外链图片转存中…(img-IGmlilAK-1712553856122)]

【Android高级架构视频学习资源】

**Android部分精讲视频领取学习后更加是如虎添翼！**进军BATJ大厂等（备战）！现在都说互联网寒冬，其实无非就是你上错了车，且穿的少（技能），要是你上对车，自身技术能力够强，公司换掉的代价大，怎么可能会被裁掉，都是淘汰末端的业务Curd而已！现如今市场上初级程序员泛滥，这套教程针对Android开发工程师1-6年的人员、正处于瓶颈期，想要年后突破自己涨薪的，进阶Android中高级、架构师对你更是如鱼得水，赶快领取吧！

《互联网大厂面试真题解析、进阶开发核心学习笔记、全套讲解视频、实战项目源码讲义》点击传送门即可获取！