旺仔：Content Provider读取手机联系人

//联系人信息
    public void bt5_OnClick(View v)
    {
        //得到调用者
        ContentResolver contentResolver=getContentResolver();
        //准备URI
       // ContactsContract.Contacts.CONTENT_URI;
        //调用提供者
        Cursor cursor=contentResolver.query(ContactsContract.Contacts.CONTENT_URI,
                null, null, null, null);
        //遍历数据集合
        if (cursor!=null)
        {
            while (cursor.moveToNext())
            {
                long id=cursor.getLong(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                String sName=cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                Log.e("TAG","id="+id+"Name="+sName);
                //读这个联系人的电话信息
               Cursor c= getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=?", new String[]{id + ""}, null);
               if (c!=null)
               {
                   while (c.moveToNext())
                   {
                       //读电话
                       long Pid=c.getLong(c.getColumnIndex(ContactsContract.CommonDataKinds.Phone._ID));
                       String number=c.getString(c.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                       Log.e("TAG",sName+"电话号码="+number+"id="+Pid);
                   }
                   c.close();
               }
            }
            Toast.makeText(MainActivity.this, "联系人的数量="+cursor.getCount(), Toast.LENGTH_SHORT).show();
        }else {
            Toast.makeText(MainActivity.this, "未查到联系人的信息", Toast.LENGTH_SHORT).show();
        }
    }