我有一个用Android Studio编写的简单类:
package com.mysite.myapp;
import org.apache.http.client.HttpClient;
public class Whatever {
public void headBangingAgainstTheWallExample () {
HttpClient client = new DefaultHttpClient();
}
}
从这里我得到以下编译时错误:
Cannot resolve symbol HttpClient
不HttpClient包含在Android Studio SDK中？即使不是,我也将它添加到我的Gradle构建中:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.0.0'
compile 'org.apache.httpcomponents:httpclient:4.5'
}
无论有没有最后一个编译行,错误都是一样的.我错过了什么？
我正在尝试开发XML导出功能,以便我的应用程序用户以XML格式导出他们的数据.我已经准备好这个功能,直到它开始失败了一些情况.然后我意识到这是因为需要编码的一些特殊字符.例如,数据可能包含&或!或%或'或#等等,这需要妥善转义.我想知道是否有可用的通用实用程序可以根据XML规范转义所有特殊字符.我在谷歌上找不到任何东西.
那里有类似的东西吗？或者还有其他办法吗？
这是我用来生成XML的代码
Document xmldoc = new DocumentImpl();
Element root = xmldoc.createElement("Report");
Element name= xmldoc.createElement((exportData.getChartName() == null) ? "Report" : exportData.getChartName());
if (exportData.getExportDataList().size() > 0
&& exportData.getExportDataList().get(0) instanceof Vector) {
// First row is the HEADER, i.e name
Vector name = exportData.getExportDataList().get(0);
for (int i = 1; i value = exportData.getExportDataList().get(i);
Element sub_root = xmldoc.createElement("Data");
//I had to remove a for loop from here. StackOverflow description field would not take that. :(
// Insert header row
Element node = xmldoc.createElementNS(null, replaceUnrecognizedChars(name.get(j))); …我正在开发一个项目.这适用于Android studio 2.3.3,但是当我更新我的Android Studio 3.0并打开我的项目然后它无法组装并且它发送给我下面的错误日志时会发生什么.
错误日志
Error:Error converting bytecode to dex:
Cause: com.android.dex.DexException: Multiple dex files define Lorg/apache/commons/io/IOCase;
Error:com.android.dex.DexException: Multiple dex files define Lorg/apache/commons/io/IOCase;
Error: at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:661)
Error: at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:616)
Error: at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:598)
Error: at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)
Error: at com.android.dx.merge.DexMerger.merge(DexMerger.java:198)
Error: at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:61)
Error: at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:36)
Error: at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1424)
Error: at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
Error: at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
Error: at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
Error: at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Error:Execution failed for task ':app:transformDexArchiveWithDexMergerForDebug'.
> com.android.build.api.transform.TransformException: com.android.dex.DexException: Multiple dex files define Lorg/apache/commons/io/IOCase;
请不要重复,因为我已经尝试过以下所有的事情