数据存储：ContentProvider获取联系人

系统自带的contentprovider：联系人照片音乐等
获取联系人：
首先添加权限
<uses-permission android:name="android.permission.READ_CONTACTS" />

先获得内容解析器ContentResolver
ContentResolver resolver = getContentResolver();
获取联系人的uri
Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;

//                Cursor cursor = resolver.query(uri,null,null,null,null);

获取联系人的号码和姓名

Cursor cursor = resolver.query(uri,new String[]{ ContactsContract.CommonDataKinds.Phone.NUMBER,ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME},null,null,null);

cursor.moveToFirst();
while(!cursor.isAfterLast()){
                    String[] names = cursor.getColumnNames();
                    StringBuffer buffer = new StringBuffer();
for(String name:names){
                        String value = cursor.getString(cursor.getColumnIndex(name));
                        buffer.append("字段名：" + name + "字段值：" + value);
                    }
                    Log.d("kaka", buffer.toString());
                    cursor.moveToNext();
                }