contentProvider的工作原理

public class MyProvider extends ContentProvider {

private static final UriMatcher matcher =new UriMatcher(UriMatcher.NO_MATCH);
private MySqliteOpenHelper helper;

static{
    //authority  认证  需要写 在清单文件中配置   android:authorities="cn.cn.provider" >
    //path  路径  相当二级路径  https://www.baidu.com/game 里的/game
    //code  uri匹配成功以后返回的数  必须正数
    matcher.addURI("cn.cn.provider", "query", 1);
    matcher.addURI("cn.cn.provider", "insert", 2);
    matcher.addURI("cn.cn.provider", "delete", 3);
    matcher.addURI("cn.cn.provider", "update", 4);
}