通訊錄的旁邊有A-Z

1.定義一個類，繼承View，三個有參構造方法，以及onDraw方法，用接口回調的方法設定點選事件。寫一個dispatchTouchEvent方法，判斷如果松開就隐藏，按下則顯示。 2.在activity_main中定義Textview控件和自定義的類，并設定id,在MainActivity中找到控件，。代碼: MainActivity:

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.widget.ListView;

import android.widget.TextView;

import java.util.Collections;

import java.util.List;

public class MainActivity extends AppCompatActivity {

private ListView mListview;

private AddressAdapter adapter;

private List<Address> addressList;

private SlideBar mSlideBar;

private TextView mTextletter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout. activity_main);

mListview = (ListView) findViewById(R.id. mListView);

mSlideBar = (SlideBar) findViewById(R.id. sb_right);

mTextletter = (TextView) findViewById(R.id. txt_letter);

mSlideBar.setText( mTextletter);

addressList = Address. getAddress();

Collections. sort( addressList, new Sort.AddressCompartor());

adapter = new AddressAdapter( this, addressList);

adapter.setIndex();

mListview.setAdapter( adapter);

mSlideBar.setListener( new SlideBar.OnTouchDownListener() {

@Override

public void onTouch(String letter) {

int index = adapter.getIndex(letter);

if (index != - 1) {

// listview設定目前的位置

mListview.setSelection(index);

}

});

}

} address:

import java.util.ArrayList;

import java.util.List;

public class Address {

private int id;

private String name;

public int getId() {

return id;

}

public void setId( int id) {

this. id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this. name = name;

}

public static List<Address> getAddress() {

List<String> list = getAllMember();

List<Address> addresses = new ArrayList<>();

for ( int i = 0; i < list.size(); i++) {

Address address = new Address();

address.setId(i);

address.setName(list.get(i));

addresses.add(address);

}

return addresses;

}

public static List<String> getAllMember() {

List<String> addresses = new ArrayList<>();

addresses.add( "bdvs");

addresses.add( "馬你不");

addresses.add( "王九");

addresses.add( "李廣");

addresses.add( "李飛");

addresses.add( "張偉");

addresses.add( "馬田");

addresses.add( "商具體");

addresses.add( "韓可以");

addresses.add( "張交易");

addresses.add( "韓嗎");

addresses.add( "張近一");

addresses.add( "李進度");

addresses.add( "1512薛美女");

addresses.add( "楊今天");

addresses.add( "行核對");

addresses.add( "郭按時");

addresses.add( "郭方式");

addresses.add( "李百度");

addresses.add( "王過的");

addresses.add( "段更多");

addresses.add( "李和他");

addresses.add( "張舒服");

addresses.add( "劉方式");

addresses.add( "靳廣東人");

addresses.add( "徐是");

addresses.add( "李黃飛");

addresses.add( "崔廣辦");

addresses.add( "宋答複");

addresses.add( "廉幹部");

addresses.add( "張水電");

addresses.add( "繩可以");

addresses.add( "陳監獄");

addresses.add( "黃回調");

addresses.add( "李背景");

addresses.add( "王菊花");

addresses.add( "叢好熱");

addresses.add( "劉三個");

addresses.add( "龐黃飛");

addresses.add( "楊嗨翻天");

addresses.add( "尹聽過");

return addresses;

}

PinyinUtils: import net.sourceforge.pinyin4j.PinyinHelper;

import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;

import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;

import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;

import net.sourceforge.pinyin4j.format.HanyuPinyinVCharType;

import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;

public class PinyinUtils {

/**
	 * 傳回首字母，大寫
 	*/
  public static String getFirstLetter(String str) {
    if (TextUtils.isEmpty(str)) {
        return "";
    }
    // 得到一個字元串的拼音的大寫
    String pinyinStr = getPinyin(str).toUpperCase();
    // 取拼音字元串的第一個字母
    char firstCahr = pinyinStr.charAt(0);
    // 不是A-Z字母
    if (firstCahr > 90 || firstCahr < 65) {
        return "#";
    }else{ // 代表是A-Z
        return String.valueOf(firstCahr);
    }
}
    /**
     * 得到一個字元串的拼音讀音
     */
    public static String getPinyin(String chineseStr) {
        StringBuffer sb = new StringBuffer();
        // 将漢字拆分成一個個的char
        char[] chars = chineseStr.toCharArray();
        // 周遊漢字的每一個char
        for (int i = 0; i < chars.length; i++) {
            try {
                // 漢字的所有讀音放在一個pinyins數組
                String[] strings = PinyinHelper.toHanyuPinyinStringArray(chars[i], getDefaultFormat());
                if (strings == null) {
                    sb.append(chars[i]);
                } else {
                    sb.append(strings[0]);
                }
            } catch (BadHanyuPinyinOutputFormatCombination badHanyuPinyinOutputFormatCombination) {
                badHanyuPinyinOutputFormatCombination.printStackTrace();
            }
        }
        return sb.toString();
    }
    /**
     * 設定預設的輸出格式
     */
    public static HanyuPinyinOutputFormat getDefaultFormat() {
        HanyuPinyinOutputFormat outputFormat = new HanyuPinyinOutputFormat();
        //去除聲調
        outputFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        //小寫
        outputFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        // 包含Unicode特殊字元
        outputFormat.setVCharType(HanyuPinyinVCharType.WITH_U_UNICODE);
        return outputFormat;
    }
}

Sort: import java.util.Comparator;

public class Sort {

public static class AddressCompartor implements Comparator< Address>{

@Override public int compare( Address o1, Address o2) {

String o1f = PinyinUtils. getFirstLetter(o1.getName());

String o2f = PinyinUtils. getFirstLetter(o2.getName());

if (o1f.equals( "#")) {

return 1;

} else if (o2f.equals( "#")) {

return - 1;

} else {

return o1f.compareTo(o2f);

}

} AddressAdapter: import android.content.Context;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

import java.util.List;

public class AddressAdapter extends BaseAdapter {

private Context context;

private List<Address> list;

private Map<String, Integer> indexMap = new HashMap<>();
    public AddressAdapter(Context context, List<Address> list) {
        this.context = context;
        this.list = list;
    }
       public void setIndex() {
      indexMap.clear();
     for (int i = 0; i < list.size(); i++) {
        // 周遊資料，得到首字母
        String index = PinyinUtils.getFirstLetter(list.get(i).getName());
        // 如果索引map中不包含這個字母，就添加進索引map，key是字母，value是第一次出現的位置
        if (!indexMap.containsKey(index)) {
            indexMap.put(index, i);
          }
      }
  }
    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(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=View.inflate(context, R.layout.activity_address,null);      
    holder.title= (TextView) convertView.findViewById(R.id.text_title);
            holder.mTextName = (TextView) convertView.findViewById(R.id.mTextName);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }      
    // 拿到目前條目
     String str = addressList.get(position).getName();
     // 取目前條目的首字母
     String first = PinyinUtils.getFirstLetter(str);
      if (indexMap.get(first) == position) {
          holder.title.setVisibility(View.VISIBLE);
          holder.title.setText(first);
       } else {
            holder.title.setVisibility(View.GONE);
        }
        holder.mTextName.setText(list.get(position).getName());
        return convertView;
    }

    class ViewHolder {      
    TextView title;
        TextView mTextName;
    }
}

SlideBar:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
import java.util.Date;
public class SlideBar extends View {
    private static final String TAG = "SlideBar";
    private String[] letters = {
            "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 OnTouchDownListener listener;
    private TextView textView;
    private int choose = -1;
    private int oldChoose = -1;
    public void setListener(OnTouchDownListener listener) {
        this.listener = listener;
    }
    public SlideBar(Context context) {
        super(context);
    }
    public SlideBar(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
    public SlideBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    public void setText(TextView textView) {
        this.textView = textView;
    }
    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        int action = event.getAction();
        // 手指觸摸的縱坐标
        float y = event.getY();
        // 計算公式,字母的位置 = y*字母的總個數/總高度
        int pos = (int) (y * letters.length / getHeight());
        oldChoose = choose;
        switch (action) {
            case MotionEvent.ACTION_UP: // 手指擡起
                // 把顯示字母的textview隐藏
                if (textView != null) {
                    textView.setVisibility(View.INVISIBLE);
                }
                // 按下的位置設定成-1，未選中
                choose = -1;
                // 重新整理，重繪
                invalidate();
                break;
            default: // 手指按下和移動
                // 在邊界内，也就是在letters範圍之内
                if (pos >= 0 && pos < letters.length) {
                    // 按下的時候顯示 顯示字母的textview，并且把字母設定成我們按下的位置的字母
                    if (textView != null) {
                        textView.setVisibility(VISIBLE);
                        textView.setText(letters[pos]);
                    }
                    // 手指按下和移動的時候把目前選中的字母傳出去
                    if (listener != null) {
                        listener.onTouch(letters[pos]);
                    }
                    // 改變目前選中的字母
                    // 優化，隻有當目前選中位置和上次選中的位置不同的時候才重繪
                    if (oldChoose != pos){
                        choose = pos;
                        invalidate();
                    }
                }
                break;
        }
        return true;
    }
    @Override
    protected void onDraw(Canvas canvas) {
        Log.i(TAG, "onDraw: " + new Date(System.currentTimeMillis()));
        super.onDraw(canvas);
        int width = getWidth();
        int height = getHeight();
        int singleHeight = height / letters.length;
        Paint bgPaint = new Paint();
        bgPaint.setColor(Color.parseColor("#44000000"));
        bgPaint.setAntiAlias(true);
        canvas.drawPaint(bgPaint);
        bgPaint.reset();

        for (int i = 0; i < letters.length; i++) {
            Paint paint = new Paint();
            paint.setColor(Color.parseColor("#FFFFFF"));
            paint.setTextSize(30);
            // 字元占的寬度
            float f = paint.measureText(letters[i]);
            float xPos = width / 2 - f / 2;
            float yPos = singleHeight * (i + 1);
            if (i == choose) {
                paint.setColor(Color.parseColor("#FF0000"));
                paint.setFakeBoldText(true);
            }
            canvas.drawText(letters[i], xPos, yPos, paint);
            paint.reset();
        }
    }
    interface OnTouchDownListener {
        void onTouch(String letter);
    }
}

通訊錄的旁邊有A-Z

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