Android SectionIndexer 的使用（联系人分类索引）

2021-08-09 06:54:47

// 获取标题栏索引

int position = sectionIndexter.getPositionForSection(l[idx]);

            if (position == -) {

                return true;

            }

// 设置调整到指定区域

            list.setSelection(position);

1. Main.xml

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

<RelativeLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

<ListView android:id="@+id/myListView"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

/>

<android.test.SideBar

    android:id = "@+id/sideBar"

    android:layout_height="fill_parent"

    android:layout_width="22px"

    android:layout_alignParentRight="true"

/>

</RelativeLayout>

2. listview_row.xml

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

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content">

<LinearLayout

    android:id="@+id/section"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

/>

<TextView android:id="@+id/textView"

    android:layout_width="wrap_content"

    android:layout_height="80sp"

    android:textSize="45sp"

/>

</LinearLayout>

3. MyAdapter.Java

package android.test;

import java.util.ArrayList;

import android.app.Activity;

import android.content.Context;

import android.graphics.Color;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.LinearLayout;

import android.widget.SectionIndexer;

import android.widget.TextView;

public class MyAdapter extends BaseAdapter implements SectionIndexer {

    private ArrayList<String> stringArray;

    private Context context;

    public MyAdapter(Context _context, ArrayList<String> arr) {

        stringArray = arr;

        context = _context;

    }

    public int getCount() {

        return stringArray.size();

    }

    public Object getItem(int arg0) {

        return stringArray.get(arg0);

    }

    public long getItemId(int arg0) {

        return ;

    }

    public View getView(int position, View v, ViewGroup parent) {

        LayoutInflater inflate = ((Activity) context).getLayoutInflater();

        View view = (View) inflate.inflate(R.layout.listview_row, null);

        LinearLayout header = (LinearLayout) view.findViewById(R.id.section);

        String label = stringArray.get(position);

        char firstChar = label.toUpperCase().charAt();

        if (position == ) {

            setSection(header, label);

        } else {

            String preLabel = stringArray.get(position - );

            char preFirstChar = preLabel.toUpperCase().charAt();

            if (firstChar != preFirstChar) {

                setSection(header, label);

            } else {

                header.setVisibility(View.GONE);

            }

        }

        TextView textView = (TextView) view.findViewById(R.id.textView);

        textView.setText(label);

        return view;

    }

    private void setSection(LinearLayout header, String label) {

        TextView text = new TextView(context);

        header.setBackgroundColor(0xffaabbcc);

        text.setTextColor(Color.WHITE);

        text.setText(label.substring(, ).toUpperCase());

        text.setTextSize();

        text.setPadding(, , , );

        text.setGravity(Gravity.CENTER_VERTICAL);

        header.addView(text);

    }

    public int getPositionForSection(int section) {

        if (section == ) {

            return ;

        }

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

            String l = stringArray.get(i);

            char firstChar = l.toUpperCase().charAt();

            if (firstChar == section) {

                return i;

            }

        }

        return -;

    }

    public int getSectionForPosition(int arg0) {

        return ;

    }

    public Object[] getSections() {

        return null;

    }

}

4. SideBar.java

package android.test;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.widget.ListView;

import android.widget.SectionIndexer;

public class SideBar extends View {

    private char[] l;

    private SectionIndexer sectionIndexter = null;

    private ListView list;

    private final int m_nItemHeight = ;

    public SideBar(Context context) {

        super(context);

        init();

    }

    public SideBar(Context context, AttributeSet attrs) {

        super(context, attrs);

        init();

    }

    private void init() {

        l = new char[] { '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' };

        setBackgroundColor(0x44FFFFFF);

    }

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

        super(context, attrs, defStyle);

        init();

    }

    public void setListView(ListView _list) {

        list = _list;

        sectionIndexter = (SectionIndexer) _list.getAdapter();

    }

    public boolean onTouchEvent(MotionEvent event) {

        super.onTouchEvent(event);

        int i = (int) event.getY();

        int idx = i / m_nItemHeight;

        if (idx >= l.length) {

            idx = l.length - ;

        } else if (idx < ) {

            idx = ;

        }

        if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {

            if (sectionIndexter == null) {

                sectionIndexter = (SectionIndexer) list.getAdapter();

            }

            int position = sectionIndexter.getPositionForSection(l[idx]);

            if (position == -) {

                return true;

            }

            list.setSelection(position);

        }

        return true;

    }

    protected void onDraw(Canvas canvas) {

        Paint paint = new Paint();

        paint.setColor(0xFFA6A9AA);

        paint.setTextSize(getMeasuredHeight()/);

        paint.setTextAlign(Paint.Align.CENTER);

        float widthCenter = getMeasuredWidth() / ;

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

            canvas.drawText(String.valueOf(l[i]), widthCenter, m_nItemHeight + (i * m_nItemHeight), paint);

        }

        super.onDraw(canvas);

    }

}

5. Main.java

package android.test;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ListView;

public class Main extends Activity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        ListView list = (ListView) findViewById(R.id.myListView);

        ArrayList<String> stringList = InitListViewData();

        MyAdapter adapter = new MyAdapter(this, stringList);

        list.setAdapter(adapter);

        SideBar indexBar = (SideBar) findViewById(R.id.sideBar);

        indexBar.setListView(list);

    }

    private ArrayList<String> InitListViewData() {

        ArrayList<String> stringList = new ArrayList<String>();

        stringList.add("aback");

        stringList.add("abash");

        stringList.add("abbey");

        stringList.add("abhor");

        stringList.add("abide");

        stringList.add("abuse");

        stringList.add("candidate");

        stringList.add("capture");

        stringList.add("careful");

        stringList.add("catch");

        stringList.add("cause");

        stringList.add("celebrate");

        stringList.add("forever");

        stringList.add("fable");

        stringList.add("fidelity");

        stringList.add("fox");

        stringList.add("funny");

        stringList.add("fail");

        stringList.add("jail");

        stringList.add("jade");

        stringList.add("jailor");

        stringList.add("january");

        stringList.add("jasmine");

        stringList.add("jazz");

        stringList.add("zero");

        stringList.add("zoo");

        stringList.add("zeus");

        stringList.add("zebra");

        stringList.add("zest");

        stringList.add("zing");

        return stringList;

    }

}

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