【移動應用開發(fā)技術】怎么在android中仿微信好友列表功能

這期內容當中在下將會給大家?guī)碛嘘P怎么在android中仿微信好友列表功能，文章內容豐富且以專業(yè)的角度為大家分析和敘述，閱讀完這篇文章希望大家可以有所收獲。（1）在build.gradle中引用第三方的類庫compile

'com.android.support:recyclerview-v7:26.0.0-alpha1'

compile

files('libs/pinyin4j-2.5.0.jar')（2）在MainActivity：public

class

MainActivity

extends

AppCompatActivity

{

//參考網(wǎng)址：/JanecineJohn/WeChatList

private

RecyclerView

contactList;

private

String[]

contactNames;

private

LinearLayoutManager

layoutManager;

private

LetterView

letterView;

private

ContactAdapter

adapter;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

contactNames

=

new

String[]

{"安然","奧茲","德瑪","張三豐",

"郭靖",

"黃蓉",

"黃老邪",

"趙敏",

"123",

"天山童姥",

"任我行",

"于萬亭",

"陳家洛",

"韋小寶",

"$6",

"穆人清",

"陳圓圓",

"郭芙",

"郭襄",

"穆念慈",

"東方不敗",

"梅超風",

"林平之",

"林遠圖",

"滅絕師太",

"段譽",

"鳩摩智"};

contactList

=

(RecyclerView)

findViewById(R.id.contact_list);

letterView

=

(LetterView)

findViewById(R.id.letter_view);

layoutManager

=

new

LinearLayoutManager(this);

adapter

=

new

ContactAdapter(this,

contactNames);

contactList.setLayoutManager(layoutManager);

contactList.addItemDecoration(new

DividerItemDecoration(this,

DividerItemDecoration.VERTICAL_LIST));

contactList.setAdapter(adapter);

letterView.setCharacterListener(new

LetterView.CharacterClickListener()

{

@Override

public

void

clickCharacter(String

character)

{

layoutManager.scrollToPositionWithOffset(adapter.getScrollPosition(character),0);

}

@Override

public

void

clickArrow()

{

layoutManager.scrollToPositionWithOffset(0,0);

}

});

}

}

（3）Contact類

public

class

Contact

implements

Serializable

{

private

String

mName;

private

int

mType;

public

Contact(String

name,

int

type)

{

mName

=

name;

mType

=

type;

}

public

String

getmName()

{

return

mName;

}

public

int

getmType()

{

return

mType;

}

}（3）listview好友列表適配器，在這里設置顯示的用戶名和頭像，并且添加點擊事件

ContactAdapterpublic

class

ContactAdapter

extends

RecyclerView.Adapter<RecyclerView.ViewHolder>{

private

LayoutInflater

mLayoutInflater;

private

Context

mContext;

private

String[]

mContactNames;

//

聯(lián)系人名稱字符串數(shù)組

private

List<String>

mContactList;

//

聯(lián)系人名稱List（轉換成拼音）

private

List<Contact>

resultList;

//

最終結果（包含分組的字母）

private

List<String>

characterList;

//

字母List

public

enum

ITEM_TYPE

{

ITEM_TYPE_CHARACTER,

ITEM_TYPE_CONTACT

}

public

ContactAdapter(Context

context,

String[]

contactNames)

{

mContext

=

context;

mLayoutInflater

=

LayoutInflater.from(context);

mContactNames

=

contactNames;

handleContact();

}

private

void

handleContact()

{

mContactList

=

new

ArrayList<>();

Map<String,

String>

map

=

new

HashMap<>();

for

(int

i

=

0;

i

<

mContactNames.length;

i++)

{

String

pinyin

=

Utils.getPingYin(mContactNames[i]);

map.put(pinyin,

mContactNames[i]);

mContactList.add(pinyin);

}

Collections.sort(mContactList,

new

ContactComparator());

resultList

=

new

ArrayList<>();

characterList

=

new

ArrayList<>();

for

(int

i

=

0;

i

<

mContactList.size();

i++)

{

String

name

=

mContactList.get(i);

String

character

=

(name.charAt(0)

+

"").toUpperCase(Locale.ENGLISH);

if

(!characterList.contains(character))

{

if

(character.hashCode()

>=

"A".hashCode()

&&

character.hashCode()

<=

"Z".hashCode())

{

//

是字母

characterList.add(character);

resultList.add(new

Contact(character,

ITEM_TYPE.ITEM_TYPE_CHARACTER.ordinal()));

}

else

{

if

(!characterList.contains("#"))

{

characterList.add("#");

resultList.add(new

Contact("#",

ITEM_TYPE.ITEM_TYPE_CHARACTER.ordinal()));

}

}

}

resultList.add(new

Contact(map.get(name),

ITEM_TYPE.ITEM_TYPE_CONTACT.ordinal()));

}

}

@Override

public

RecyclerView.ViewHolder

onCreateViewHolder(ViewGroup

parent,

int

viewType)

{

if

(viewType

==

ITEM_TYPE.ITEM_TYPE_CHARACTER.ordinal())

{

return

new

CharacterHolder(mLayoutInflater.inflate(R.layout.item_character,

parent,

false));

}

else

{

return

new

ContactHolder(mLayoutInflater.inflate(R.layout.item_contact,

parent,

false));

}

}

@Override

public

void

onBindViewHolder(RecyclerView.ViewHolder

holder,

int

position)

{

if

(holder

instanceof

CharacterHolder)

{

((CharacterHolder)

holder).mTextView.setText(resultList.get(position).getmName());

}

else

if

(holder

instanceof

ContactHolder)

{

((ContactHolder)

holder).mTextView.setText(resultList.get(position).getmName());

}

}

@Override

public

int

getItemViewType(int

position)

{

return

resultList.get(position).getmType();

}

@Override

public

int

getItemCount()

{

return

resultList

==

null

?

0

:

resultList.size();

}

public

class

CharacterHolder

extends

RecyclerView.ViewHolder

{

TextView

mTextView;

CharacterHolder(View

view)

{

super(view);

mTextView

=

(TextView)

view.findViewById(R.id.character);

}

}

public

class

ContactHolder

extends

RecyclerView.ViewHolder

{

TextView

mTextView;

ContactHolder(View

view)

{

super(view);

mTextView

=

(TextView)

view.findViewById(R.id.contact_name);

}

}

public

int

getScrollPosition(String

character)

{

if

(characterList.contains(character))

{

for

(int

i

=

0;

i

<

resultList.size();

i++)

{

if

(resultList.get(i).getmName().equals(character))

{

return

i;

}

}

}

return

-1;

//

-1不會滑動

}

}（4）ContactComparator

做英文字母的判斷public

class

ContactComparator

implements

Comparator<String>

{

@Override

public

int

compare(String

o1,

String

o2)

{

int

c1

=

(o1.charAt(0)

+

"").toUpperCase().hashCode();

int

c2

=

(o2.charAt(0)

+

"").toUpperCase().hashCode();

boolean

c1Flag

=

(c1

<

"A".hashCode()

||

c1

>

"Z".hashCode());

//

不是字母

boolean

c2Flag

=

(c2

<

"A".hashCode()

||

c2

>

"Z".hashCode());

//

不是字母

if

(c1Flag

&&

!c2Flag)

{

return

1;

}

else

if

(!c1Flag

&&

c2Flag)

{

return

-1;

}

return

c1

-

c2;

}

}（5）DividerItemDecorationpublic

class

DividerItemDecoration

extends

RecyclerView.ItemDecoration

{

private

static

final

int[]

ATTRS

=

new

int[]{

android.R.attr.listDivider

};

public

static

final

int

HORIZONTAL_LIST

=

LinearLayoutManager.HORIZONTAL;

public

static

final

int

VERTICAL_LIST

=

LinearLayoutManager.VERTICAL;

private

Drawable

mDivider;

private

int

mOrientation;

public

DividerItemDecoration(Context

context,

int

orientation)

{

final

TypedArray

a

=

context.obtainStyledAttributes(ATTRS);

mDivider

=

a.getDrawable(0);

a.recycle();

setOrientation(orientation);

}

private

void

setOrientation(int

orientation)

{

if

(orientation

!=

HORIZONTAL_LIST

&&

orientation

!=

VERTICAL_LIST)

{

throw

new

IllegalArgumentException("invalid

orientation");

}

mOrientation

=

orientation;

}

@Override

public

void

onDraw(Canvas

c,

RecyclerView

parent)

{

if

(mOrientation

==

VERTICAL_LIST)

{

drawVertical(c,

parent);

}

else

{

drawHorizontal(c,

parent);

}

}

//

@Override

//

public

void

onDraw(Canvas

c,

RecyclerView

parent,

RecyclerView.State

state)

{

//

//super.onDraw(c,

parent,

state);

//

if

(mOrientation

==

VERTICAL_LIST)

{

//

drawVertical(c,

parent);

//

}

else

{

//

drawHorizontal(c,

parent);

//

}

//

}

public

void

drawVertical(Canvas

c,

RecyclerView

parent)

{

final

int

left

=

parent.getPaddingLeft();

final

int

right

=

parent.getWidth()

-

parent.getPaddingRight();

final

int

childCount

=

parent.getChildCount();

for

(int

i

=

0;

i

<

childCount;

i++)

{

final

View

child

=

parent.getChildAt(i);

final

RecyclerView.LayoutParams

params

=

(RecyclerView.LayoutParams)

child

.getLayoutParams();

final

int

top

=

child.getBottom()

+

params.bottomMargin

+

Math.round(ViewCompat.getTranslationY(child));

final

int

bottom

=

top

+

mDivider.getIntrinsicHeight();

mDivider.setBounds(left,

top,

right,

bottom);

mDivider.draw(c);

}

}

public

void

drawHorizontal(Canvas

c,

RecyclerView

parent)

{

final

int

top

=

parent.getPaddingTop();

final

int

bottom

=

parent.getHeight()

-

parent.getPaddingBottom();

final

int

childCount

=

parent.getChildCount();

for

(int

i

=

0;

i

<

childCount;

i++)

{

final

View

child

=

parent.getChildAt(i);

final

RecyclerView.LayoutParams

params

=

(RecyclerView.LayoutParams)

child

.getLayoutParams();

final

int

left

=

child.getRight()

+

params.rightMargin

+

Math.round(ViewCompat.getTranslationX(child));

final

int

right

=

left

+

mDivider.getIntrinsicHeight();

mDivider.setBounds(left,

top,

right,

bottom);

mDivider.draw(c);

}

}

@Override

public

void

getItemOffsets(Rect

outRect,

int

itemPosition,

RecyclerView

parent)

{

if

(mOrientation

==

VERTICAL_LIST)

{

outRect.set(0,

0,

0,

mDivider.getIntrinsicHeight());

}

else

{

outRect.set(0,

0,

mDivider.getIntrinsicWidth(),

0);

}

}

//

@Override

//

public

void

getItemOffsets(Rect

outRect,

View

view,

RecyclerView

parent,

RecyclerView.State

state)

{

//

if

(mOrientation

==

VERTICAL_LIST){

//

outRect.set(0,0,0,mDivider.getIntrinsicHeight());

//

}else

{

//

outRect.set(0,0,mDivider.getIntrinsicWidth(),0);

//

}

//

}

}（6）LetterViewpublic

class

LetterView

extends

LinearLayout{

private

Context

mContext;

private

CharacterClickListener

mListener;

public

LetterView(Context

context,AttributeSet

attrs)

{

super(context,

attrs);

mContext

=

context;//接收傳進來的上下文

setOrientation(VERTICAL);

initView();

}

private

void

initView(){

addView(buildImageLayout());

for

(char

i

=

'A';i<='Z';i++){

final

String

character

=

i

+

"";

TextView

tv

=

buildTextLayout(character);

addView(tv);

}

addView(buildTextLayout("#"));

}

private

TextView

buildTextLayout(final

String

character){

LinearLayout.LayoutParams

layoutParams

=

new

LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,

ViewGroup.LayoutParams.MATCH_PARENT,1);

TextView

tv

=

new

TextView(mContext);

tv.setLayoutParams(layoutParams);

tv.setGravity(Gravity.CENTER);

tv.setClickable(true);

tv.setText(character);

tv.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

view)

{

if

(mListener

!=

null){

mListener.clickCharacter(character);

}

}

});

return

tv;

}

private

ImageView

buildImageLayout()

{

LinearLayout.LayoutParams

layoutParams

=

new

LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,

LayoutParams.MATCH_PARENT,

1);

ImageView

iv

=

new

ImageView(mContext);

iv.setLayoutParams(layoutParams);

iv.setBackgroundResource(R.mipmap.ic_launcher);

iv.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

if

(mListener

!=

null)