降版本编译报错,不知道怎么回事

平台改成sdk 23编译就报这个错,但是我看了这个api是在23的时候就开始用了啊。为什么会这样。
The import android.support.annotation.RequiresApi cannot be resolved

4个回答

降库会造成很多问题,而不是单单改一下你的compileSdkVersion和targetSdkVersion,gradle文件中的dependencies也要匹配你当前sdk版本

android.support.annotation.RequiresApi cannot be resolved,看下你引用的注解在哪个版本加进去的,你目前使用的版本肯定是没有了

步骤1:在gradle中修改 compile sdk 版本,比如 8.

步骤2:在gradle中删除v7包的依赖

步骤3:在manifest中修改theme,supportsRtl。theme需要修改成当前编译版本支持的主题,可以使用DeviceDefault主题等。删除supportsRtl属性。

步骤4:将继承appcompatActivity修改为Activity

在编写安卓程序时,当我import android.support.v4.app.FragmentActivity;出现题目中的错误,主要是缺少android.support的库,解决方法为下述链接:

http://www.qbmob.com/?p=854

在ADT中需要按照以下步骤:

1、右击当前工程,查找Properties

2、选择Java Build Path

3、选择Libraries tab,点击右边面板的Add External JARs按钮

4、选择android-support-v4.jar文件,这一文件的常见路径为:YOUR_DRIVE\android-sdks\extras\android\support\v4\android-support-v4.jar

5、完成添加后,选择Order and Export标签,确认即可。

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这是个求霍夫曼编码的java程序,其实是改的c程序:没有任何明显逻辑错误,但是似乎存在我不知道的问题rn[code=Java]rnpackage test;rnrnimport java.io.BufferedReader;rnimport java.io.IOException;rnimport java.io.InputStreamReader;rnrnclass Nodernrn int weight; //结点权值rn int parent,lchild,rchild; //结点的父指针,左右孩子指针rnrn//HuffmanTree -->[]Nodern//HuffmanCode = char[]rnclass HuffmanTree rnrn @SuppressWarnings("null")rn HuffmanTree(Node[] HT,char [] HC,int []w,int n)rn //将有n个叶子结点的霍夫曼树HT进行编码, 所编的码存放在HC中rn //方法是从叶子到根逆向求每个叶子结点的霍夫曼编码rn //w存放n个结点的权值,将构造一棵霍夫曼树HTrn int i,c,f,start;rn char []cd = null;rn int m;rn int s1 = 0,s2 = 0;rn //Node p;rn if(n<=1) rn return;rn m = 2*n-1; //n个叶子结点的霍夫曼树,有2*n-1个结点rn //HT = (HuffmanTree)malloc((m+1)*sizeof(HTNode)); //开辟2*n各结点空间,0号单元不用rn for(i=1;i<=n;++i) //进行初始化rn rn HT[i+1].weight=w[i];rn HT[i+1].parent=0;rn HT[i+1].lchild=0;rn HT[i+1].rchild=0;rn rn for(;i<=m;++i)rn rn HT[i+1].weight=0;rn HT[i+1].parent=0;rn HT[i+1].lchild=0;rn HT[i+1].rchild=0;rn rn for(i=n+1;i<=m;++i) //建霍夫曼树rn rn Select(HT,i-1,s1,s2); rn //从HT[1...i-1]中选择parent为0且weight最小的两个结点,其序号分别为s1和s2rn HT[s1].parent=i; HT[s2].parent=i; //修改s1和s2结点的父指针parentrn HT[i].lchild=s1; HT[i].rchild=s2; //修改i结点的左右孩子指针rn HT[i].weight=HT[s1].weight+HT[s2].weight; //修改权值rn rn rn //HC=(HuffmanCode)malloc((n+1)*sizeof(char *)); //分配n个编码的头指针向量rn //cd=(char *)malloc(n*sizeof(char)); //开辟一个求编码的工作空间rn //cd[n-1]='\0'; //编码结束符rn for(i=1;i<=n;++i) //逐个地求霍夫曼编码rn rn start=n-1; //编码结束位置rn for(c=i,f=HT[i].parent;f!=0;c=f,f=HT[f].parent) //从叶子到根逆向求编码rn if(HT[f].lchild==c) rn cd[--start]='0'; //若是左孩子编为'0'rn else rn cd[--start]='1'; //若是右孩子编为'1' rn //HC[i]=(char *)malloc((n-start)*sizeof(char)); //为第i个编码分配空间rn HC[i]= cd[start]; //将编码从cd复制到HC中rn rn //free(cd); //释放工作空间rn rn rn static //rn void PrintHuffmanCode(char[] HC,int []w,int n)rn //显示有n个叶子结点的霍夫曼树的编码表rn int i;rn System.out.print("HuffmanCode is :\n");rn for(i=1;i<=n;i++)rn rn System.out.print(w[i-1]+"---"+HC[i]);rn rn System.out.print("\n");rn rn //rn void Select(Node[] HT,int t,int s1,int s2)rn //在HT[1...t]中选择parent不为0且权值最小的两个结点,其序号分别为s1和s2 rn int i,m,n;rn m = n = 1000;rn for(i=1;i<=t;i++) //在HT上进行遍历,同时获取权值最小的结点对应的序号rn rn if (HT[i].parent==0&&(HT[i].weights2) //s1放较小的序号rn rn i=s1;rn s1=s2;rn s2=i;rn rn rn public static void main(String args[]) throws IOExceptionrn rn Node []HT = null; //霍夫曼树HTrn char []HC = null; //霍夫曼编码表HCrn int n; //n是霍夫曼树叶子结点数rn int []w ; //w存放叶子结点权值 rn char Mark=' ';rn rn while(Mark!='N' && Mark!='n')rn rn System.out.println("请输入叶子结点数目:");rn BufferedReader bin = new BufferedReader(new InputStreamReader(System.in));rn String s = bin.readLine(); rn n = Integer.parseInt(s); //输入叶子结点数rn w = new int[n];rn if(n<=1) rn rn System.out.print("该数不合理!\n");rn continue;rn rn //w=(unsigned int*)malloc(n*sizeof(unsigned int)); //开辟空间存放权值rn System.out.print("请输入各叶子结点的权值:\n");rn for(int i=0;i(HuffmanTree.java:32)rn at test.HuffmanTree.main(HuffmanTree.java:143)rn[/code]
很简单!!!但是不知道怎么回事??
我在页面中加入了rn<%=now()%>rn但是无法显示时间啊!!!!
老是出错,不知道怎么回事?
我在装vs.net,装到第;二步的时候就会终止,提示错误1606,未能访问网络位置、2052。rn请指点。
不知道怎么回事求助!!
fatal error C1010: unexpected end of file while looking for precompiled header directivernError executing cl.exe.rn------------------------------------------------报错信息rn是怎么一回事啊?
不知道是怎么回事
大家好:我是一个新手,今天我的机子死了好多次我不知道是怎么回事!?我检查了很多次后来一个人说,你看看是不是有病了!我不知道是怎么回事!我各位能看看是怎么了??rnrnrnrn
不知道是怎么回事?
我写了一段代码如下:rnpData是一个640个数double类型的指针。进行如下操作rnpData中保证有640个数。rnrn......rnTRACE("*********begin***********")rnfor(int i = 0;i < 640;i++)rnrn TRACE("%d %f",i,pData[i]);rn TRACE("\n");rnrnTRACE("**********end*****************")rnrn可是输出的结果是rn1 2.333rn.....rn130 1.9797rnrn468 2.7879rn.....rn598 rnrn就没有了不知道是什么原因,请大虾们指教。
一个问题,不知道怎么回事……
我使用Set objOcx = Me.Controls.Add("Com.Test", "objOcx", Me.fraParam)rn开始都没有问题,突然有一天不知道什么原因就出错了,错误是下标越界
问题,不知道怎么回事?
为什么我打开我的程序,再进行编辑时,在编辑过程中,加.(比如:Form.ShowModal)就会出现这样的提示:rn[Fatal Error] MainForm.pas(107): Could not compile used unit 'C:\Documents and Settings\administrator.JONE\桌面\NcvConsumeApp\ConsumeUnit.pas'rn[Pascal Error] MainForm.pas(1): Unable to invoke Code Completion due to errors in source codern
求助!新手不知道怎么回事
[img=https://img-bbs.csdn.net/upload/201612/04/1480843800_695484.png][/img][img=https://img-bbs.csdn.net/upload/201612/04/1480843805_360962.png][/img][img=https://img-bbs.csdn.net/upload/201612/04/1480843809_962852.png][/img]
很简单的问题,不知道怎么回事?
在当前目录下有一个位图文件111.bmp,我用CBitmap的LoadBitmap("111.bmp")返回false,用LoadBitmap(AfxGetApp()->m_hInstance, "111.bmp")返回NULL,是不是我用的不对?????????
请指教!!不知道怎么回事??
rnrnrnrnrn rn rn rn New Page 1rnrnrnrn rn rn dddrn dddrn sdfsarn rn rn dddsfrn sadfrn sadfrn rn rn dddrn ddddrn rn rnrn ddddrn rnrnrnrn为什么我导出来的excel是空的数据没有导过来呢?rn
不知道怎么回事,结果没反应。。
#includern#includern#includernchar* my_strrstr(char *s1,char *s2)rnrn char *current,*last;rn if(*s2!='\0')rn current=strstr(s1,s2);rn last=current;rn while(current!=NULL)rn rn last=current;rn current=(last+1,s2);rn rn rn rn return last;rnrnrnint main()rnrn char a[40]="you son of a bitch!,son";rn char b[10]="so";rn puts(my_strrstr(a,b));rn return EXIT_SUCCESS;rn
不知道这是怎么回事。
数据库中字段FY_CHECK1的值是null可是我在程序里进行判断rnFY_CHECK1=rss("FY_CHECK1")rn response.write FY_CHECK1rn if FY_CHECK1=null then rn response.write "未审核"rn end if rn结果就是不出“未审核”。rn这是为什么呢,应该如何写呀?
我的IIS不知道怎么回事了!
今天中午的我dllhost.exe占用系统资源90%以上,本来可以用的IIS变成了:rn您没有权限查看该网页 rn您无权通过所用 Web 浏览器的 Internet 地址查看该目录或网页。 rnrn--------------------------------------------------------------------------------rnrn如果您确信应该能够查看该目录或网页,请与 Web 站点管理员联系,其电子邮件地址或电话号码请参阅 192.168.0.246:81 主页。rnrnHTTP 403.6 - 禁止访问:IP 地址被拒绝rnInternet 信息服务rnrn--------------------------------------------------------------------------------rnrn技术信息(支持个人)rnrnrn背景:rn导致此错误的原因是:服务器中有不能访问该站点的 IP 地址列表,并且您使用的 IP 地址在该列表中。rnrnrn详细信息:rnMicrosoft 支持 rn rn
我不知道怎么回事
我宿舍里有三台机子,用一台当服务器用,DCAD-620U Dial-up ppp conetion拨号上网,用一个Hub连接。其他都能上,但是我的不能上,在网上邻居两台机子都能访问,也能Ping通其中的一台,但就是ping不到主机(但是在网上邻居能访问),能上QQ但是打不开网页(总是显示WEB地址已经找到,但打不开不知怎么回事)。请高手指教rn
没声音,不知道怎么回事?
我电脑是IBM x200 驱动程序也是从IBM.com.cn上下载的,rn装的也正确,可就是没声音,rn郁闷。。音箱是好的。rn
崩溃了,完全不知道怎么回事?
[code=c][/code]rn[img=https://img-bbs.csdn.net/upload/201605/22/1463908180_884163.png][/img]rn#includernrnint main()rnrn int a[10];rn int i,j,swap=0;rn a[10] = 0;rn for (i = 0; i <= 9; i++)rn rnrn printf("请输入a[%d]:", i);rn scanf("%d", &a[i]);rn rn for (i = 8; i >=0; i--)rn for (j = 0; j <= i;j++)rn rn if (a[j] > a[j + 1])rn rn swap=a[j];rn a[j]=a[j+1];rn a[j+1]=swap;rn rn rn rnrn for (i = 0; i <= 9; i++)rn printf("a[%d]=%d\n", i, a[i]);rn return 0;rnrn
卡壳了,不知道怎么回事:(
我打算在jScollPane的jTextArea画图,当我定义方法rnpublic void paint(Graphics g)时,出现:rn ‘class’ or ‘interface’ expected at line ....rn这是怎么回事呀?
糟糕,不知道怎么回事?
我不小心把显示桌面的那个图片拉到SQL查询分析器中,然后就提示 “已成功装载查询文件”,rn并出现如下的字母:rn[Shell]rnCommand=2rnIconFile=explorer.exe,3rn[Taskbar]rnCommand=ToggleDesktoprnrn请问这样对数据库有没有什么影响的啊?
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