android仿微信好友列表

android studio实现微信好友列表功能，注意有一个jar包我没有放上来，请大家到MainActivity中的那个网址里面下载即可，然后把pinyin4j-2.5.0.jar复制粘贴到项目的app/libs文件夹里面，然后clean项目就可以使用了

实现效果图：

（1）在build.gradle中引用第三方的类库

compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'compile files('libs/pinyin4j-2.5.0.jar')

（2）新建一个activity_main.xml,注意红色部分为LetterView类的包名，这个类需要自己创建

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"        xmlns:tools="http://schemas.android.com/tools"        xmlns:app="http://schemas.android.com/apk/res-auto"        android:layout_width="match_parent"        android:layout_height="match_parent">        <android.support.v7.widget.RecyclerView            android:id="@+id/contact_list"            android:layout_width="match_parent"            android:layout_height="match_parent"/>        <com.example.administratorwmk.newsdemowmk.LetterView            android:id="@+id/letter_view"            android:layout_width="30dp"            android:layout_height="match_parent"            android:layout_alignParentRight="true"/>    RelativeLayout>

（2）在MainActivity：

public class MainActivity extends AppCompatActivity {    //参考网址：https://github.com/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","奥兹","德玛","张三丰", "郭靖", "黄蓉", "黄老邪", "赵敏", "123", "天山童姥", "任我行", "于万亭", "陈家洛", "韦小宝", "$6", "穆人清", "陈圆圆", "郭芙", "郭襄", "穆念慈", "东方不败", "梅超风", "林平之", "林远图", "灭绝师太", "段誉", "鸠摩智"};        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类

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好友列表适配器，在这里设置显示的用户名和头像，并且添加点击事件 ContactAdapter

public class ContactAdapter extends RecyclerView.Adapter{    private LayoutInflater mLayoutInflater;    private Context mContext;    private String[] mContactNames; // 联系人名称字符串数组    private List mContactList; // 联系人名称List（转换成拼音）    private List resultList; // 最终结果（包含分组的字母）    private List 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 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不会滑动    }}

（4）ContactComparator 做英文字母的判断

public class ContactComparator  implements Comparator {    @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）DividerItemDecoration

public 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）LetterView

public class LetterView extends LinearLayout{    private Context mContext;    private CharacterClickListener mListener;    public LetterView(Context context,AttributeSet attrs) {        super(context, attrs);        mContext = context;//接收传进来的上下文        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) {                    mListener.clickArrow();                }            }        });        return iv;    }    public void setCharacterListener(CharacterClickListener listener) {        mListener = listener;    }    public interface CharacterClickListener {        void clickCharacter(String character);        void clickArrow();    }}

（7）Utils

public class Utils {    public static String getPingYin(String inputString) {        HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();        format.setCaseType(HanyuPinyinCaseType.LOWERCASE);        format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);        format.setVCharType(HanyuPinyinVCharType.WITH_V);        char[] input = inputString.trim().toCharArray();        String output = "";        try {            for (char curchar : input) {                if (java.lang.Character.toString(curchar).matches("[\\u4E00-\\u9FA5]+")) {                    String[] temp = PinyinHelper.toHanyuPinyinStringArray(curchar, format);                    output += temp[0];                } else {                    output += java.lang.Character.toString(curchar);                }            }        } catch (BadHanyuPinyinOutputFormatCombination e) {            e.printStackTrace();        }        return output;    }}

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