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

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

（4）ContactComparator  做英文字母的判断

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）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;
    }
}