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一、CursorAdapter介绍

1、继承于BaseAdapter是个虚类,它为cursor和ListView提供了连接的桥梁。

如：public abstract class CursorAdapter extends BaseAdapter

2、注意cursor的必须要有个命名为"_id"的列。比如Contacts._ID就为"_id"

3、必须实现以下函数：

①newView(Context context, Cursor cursor, ViewGroup parent) newView：并不是每次都被调用的，它只在实例化的时候调用,数据增加的时候也会调用,但是在重绘(比如修改条目里的TextView的内容)的时候不会被调用

②bindView(View view, Context context, Cursor cursor)

bindView：从代码中可以看出在绘制Item之前一定会调用bindView方法它在重绘的时候也同样被调用

4、更新ListView方法：adapter.changeCursor(cursor)，它的功能类似于adapter.notifyDataSetChanged()方法

二、读取通讯录详解

1、权限

2、获取Cursor方法

Cursor phoneCursor = resolver.query(Phone.CONTENT_URI,                    PHONES_PROJECTION, null, null, null);

3、为什么不使用Adapter继承于BaseAdapter？

因为Object对象不能转型为Cursor， 所以使用的Adapter继承于CursorAdapter,才能转型为CursorWrapper。

/**     * 点击监听实现     *      * 实现：获得选中项的电话号码并拨号     */    private class onItemClickListener implements OnItemClickListener {        @Override        public void onItemClick(AdapterView
    parent, View view, int position, long id) {            //从指针的封装类中获得选中项的电话号码并拨号            //返回值是Object类需要向下转型成CursorWrapper类型            CursorWrapper wrapper = (CursorWrapper) lvContact.getItemAtPosition(position - 1);            //返回从0开始的索引，如果列名不存在将返回-1            int columnIndex = wrapper.getColumnIndex(Phone.NUMBER);            if (!wrapper.isNull(columnIndex)) {                String number = wrapper.getString(columnIndex);                // 判断电话号码的有效性                if (PhoneNumberUtils.isGlobalPhoneNumber(number)) {                    Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel://" + number));                    startActivity(intent);                }            }        }    }

三、例子代码

1、AndroidManifest.xml

2、item_contact.xml

3、activity_contact.xml

4、ContactAdapter.java

package com.guan.contentproviderwork.contact;import android.content.ContentUris;import android.content.Context;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.provider.ContactsContract;import android.support.v4.widget.CursorAdapter;import android.text.TextUtils;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.guan.contentproviderwork.R;import java.io.InputStream;import java.util.ArrayList;import butterknife.Bind;import butterknife.ButterKnife;/** * 定义适配器 * CursorAdapter为cursor和ListView提供了连接的桥梁 * * @author Guan * @file com.guan.contentproviderwork * @date 2015/9/8 * @Version 1.0 */public class ContactAdapter extends CursorAdapter {    private Context mContext;    /**     * 联系人显示名称     */    private static final int PHONES_DISPLAY_NAME_INDEX = 1;    /**     * 电话号码     **/    private static final int PHONES_NUMBER_INDEX = 2;    /**     * 头像ID     */    private static final int PHONES_PHOTO_ID_INDEX = 3;    /**     * 联系人的ID     */    private static final int PHONES_CONTACT_ID_INDEX = 4;    public ContactAdapter(Context context, Cursor cursor) {        super(context,cursor);        this.mContext = context;    }    @Override    public int getCount() {        if (mDataValid && mCursor != null) {            return mCursor.getCount();        } else {            return 0;        }    }    @Override    public Object getItem(int position) {        if (mDataValid && mCursor != null) {            mCursor.moveToPosition(position);            return mCursor;        } else {            return null;        }    }    @Override    public long getItemId(int position) {        if (mDataValid && mCursor != null) {            if ( mCursor.moveToPosition(position)) {                return mCursor.getLong( mRowIDColumn);            } else {                return 0;            }        } else {            return 0;        }    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        View view;        if (convertView == null) {            view = newView(mContext, mCursor, parent);        } else {            view = convertView;        }        bindView(view, mContext, mCursor);        return view;    }    @Override    public View newView(Context context, Cursor cursor, ViewGroup parent) {        ViewHolder viewholder = null;        View view = LayoutInflater.from(mContext).inflate(                R.layout.item_contact, null);        viewholder = new ViewHolder(view);        view.setTag(viewholder);        return view;    }    @Override    public void bindView(View view, Context context, Cursor cursor) {        /**         * 获取当前position         * final int position=cursor.getPosition();         */        ViewHolder viewholder = (ViewHolder) view.getTag();        /**         * 得到联系人名称         */        viewholder.name.setText(cursor.getString(PHONES_DISPLAY_NAME_INDEX) + "");        /**         * 得到手机号码         */        viewholder.number.setText(cursor.getString(PHONES_NUMBER_INDEX) + "");        /**         * 得到联系人头像         */        // 得到联系人ID        Long contactid = cursor                .getLong(PHONES_CONTACT_ID_INDEX);        // 得到联系人头像ID        Long photoid = cursor.getLong(PHONES_PHOTO_ID_INDEX);        // 得到联系人头像Bitamp        Bitmap contactPhoto = null;        // photoid 大于0 表示联系人有头像 如果没有给此人设置头像则给他一个默认的        if (photoid > 0) {            Uri uri = ContentUris.withAppendedId(                    ContactsContract.Contacts.CONTENT_URI,                    contactid);            InputStream input = ContactsContract.Contacts                    .openContactPhotoInputStream(mContext.getContentResolver(), uri);            contactPhoto = BitmapFactory.decodeStream(input);        } else {            contactPhoto = BitmapFactory.decodeResource(                    mContext.getResources(), R.mipmap.ic_launcher);        }        viewholder.ivHead.setImageBitmap(contactPhoto);    }    /**     * ViewHolder     */    static class ViewHolder {        @Bind(R.id.iv_head)        ImageView ivHead;        @Bind(R.id.name)        TextView name;        @Bind(R.id.number)        TextView number;        ViewHolder(View view) {            ButterKnife.bind(this, view);        }    }}

5、ContactActivity.java

package com.guan.contentproviderwork.contact;import android.app.Activity;import android.content.ContentResolver;import android.content.Intent;import android.database.Cursor;import android.database.CursorWrapper;import android.net.Uri;import android.os.Bundle;import android.provider.ContactsContract.CommonDataKinds.Phone;import android.telephony.PhoneNumberUtils;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import com.guan.contentproviderwork.R;import butterknife.Bind;import butterknife.ButterKnife;public class ContactActivity extends Activity {    @Bind(R.id.lv_contact)    ListView lvContact;    /**     * 联系人组     */    private static String[] PHONES_PROJECTION;    /**     * 联系人adapter     */    private ContactAdapter mContactAdapter;    /**     * Curosr     */    private Cursor mPhoneCursor;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_contact);        ButterKnife.bind(this);        // 初始化变量        initValiable();        // 获取联系人Cursor        getCursor();        // 初始化listview        bindData();        // 初始化监听        initListener();    }    /**     * 初始化变量     */    private void initValiable() {        PHONES_PROJECTION = new String[]{                "_id", Phone.DISPLAY_NAME, Phone.NUMBER, Phone.PHOTO_ID, Phone.CONTACT_ID};    }    /**     * 获取所有联系人Cursor     */    private Cursor getCursor() {        ContentResolver resolver = getContentResolver();        mPhoneCursor = resolver.query(Phone.CONTENT_URI,                PHONES_PROJECTION, null, null, null);        return mPhoneCursor;    }    /**     * 绑定数据     */    private void bindData() {        mContactAdapter = new ContactAdapter(ContactActivity.this, mPhoneCursor);        lvContact.setAdapter(mContactAdapter);    }    /**     * 初始化监听     */    private void initListener() {        lvContact.setOnItemClickListener(new onItemClickListener());    }    /**     * 点击监听实现     * 
     *     * 实现：获得选中项的电话号码并拨号     *     * 注意：不能使用仅是继承于BaseAdapter，因为Object对象不能转型为Cursor。     * 所以：使用的Adapter是继承于CursorAdapter,才能转型为CursorWrapper。     */    private class onItemClickListener implements OnItemClickListener {        @Override        public void onItemClick(AdapterView
    parent, View view, int position, long id) {            //从指针的封装类中获得选中项的电话号码并拨号            //返回值是Object类需要向下转型成CursorWrapper类型            CursorWrapper wrapper = (CursorWrapper) lvContact.getItemAtPosition(position - 1);            //返回从0开始的索引，如果列名不存在将返回-1            int columnIndex = wrapper.getColumnIndex(Phone.NUMBER);            if (!wrapper.isNull(columnIndex)) {                String number = wrapper.getString(columnIndex);                // 判断电话号码的有效性                if (PhoneNumberUtils.isGlobalPhoneNumber(number)) {                    Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel://" + number));                    startActivity(intent);                }            }        }    }    @Override    protected void onDestroy() {        super.onDestroy();        mPhoneCursor.close();    }     /**//     * 获取所有联系人//     *///    private void getPhoneContacts() {////        ContentResolver resolver = getContentResolver();//        try {//            // 获取手机联系人//            mPhoneCursor = resolver.query(Phone.CONTENT_URI,//                    PHONES_PROJECTION, null, null, null);//            if (mPhoneCursor != null) {////                while (mPhoneCursor.moveToNext()) {////                    // 得到手机号码//                    String phoneNumber = mPhoneCursor//                            .getString(PHONES_NUMBER_INDEX);//                    // 当手机号码为空的或者为空字段 跳过当前循环//                    if (TextUtils.isEmpty(phoneNumber))//                        continue;////                    // 得到联系人名称//                    String contactName = mPhoneCursor//                            .getString(PHONES_DISPLAY_NAME_INDEX);////                    // 得到联系人ID//                    Long contactid = mPhoneCursor//                            .getLong(PHONES_CONTACT_ID_INDEX);////                    // 得到联系人头像ID//                    Long photoid = mPhoneCursor.getLong(PHONES_PHOTO_ID_INDEX);////                    // 得到联系人头像Bitamp//                    Bitmap contactPhoto = null;////                    // photoid 大于0 表示联系人有头像 如果没有给此人设置头像则给他一个默认的//                    if (photoid > 0) {//                        Uri uri = ContentUris.withAppendedId(//                                ContactsContract.Contacts.CONTENT_URI,//                                contactid);//                        InputStream input = ContactsContract.Contacts//                                .openContactPhotoInputStream(resolver, uri);//                        contactPhoto = BitmapFactory.decodeStream(input);//                    } else {//                        contactPhoto = BitmapFactory.decodeResource(//                                getResources(), R.mipmap.ic_launcher);//                    }//                    ContactEntity mContact = new ContactEntity(contactName,//                            phoneNumber, contactPhoto);//                    mContacts.add(mContact);//                }                mPhoneCursor.close();//            }//        } catch (Exception e) {//            e.printStackTrace();//        }//    }}

四、效果图

五、推荐链接

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