让我们从顶部开始。我正在尝试创建一个应用程序，该应用程序需要一个 ISBN，然后连接到 Google Books 并从那里获取有关这本书的信息。我能够使用纯 java 做到这一点：
import java.net.URL;
import com.google.gdata.client.books.BooksService;
import com.google.gdata.client.books.VolumeQuery;
import com.google.gdata.data.books.VolumeEntry;
import com.google.gdata.data.books.VolumeFeed;
public class books
{
public static void main(String[] args)
{
////////////////////////////////////////////////
try
{
BooksService booksService = new BooksService("UAH");
String isbn = "9780262140874";
URL url = new URL("http://www.google.com/books/feeds/volumes/?q=ISBN%3C" + isbn + "%3E");
VolumeQuery volumeQuery = new VolumeQuery(url);
VolumeFeed volumeFeed = booksService.query(volumeQuery, VolumeFeed.class);
VolumeEntry bookInfo=volumeFeed.getEntries().get(0);
System.out.println("Title: " + bookInfo.getTitles().get(0));
System.out.println("Id: " + bookInfo.getId());
System.out.println("Authors: " + bookInfo.getCreators());
System.out.println("Description: "+bookInfo.getDescriptions()+"\n");
}catch(Exception ex){System.out.println(ex.getMessage());}
/////////////////////////////////////////////////
}}
我使用了来自 \gdata-src.java-1.46.0\gdata\java\lib 的罐子书和客户端以及来自 google-api-java-client-1.5.0-beta\dependencies 的依赖项，并且效果很好。当我尝试将其转换为 android 时，它给了我错误“转换为 Dalvik 格式失败，错误 1”，因此无法编译。然后我尝试使用 android 工具 -> 修复项目，但仍然没有运气，我尝试更改构建目标中的级别。我已经清洗了 100 次，仍然没有用。所以然后我决定删除 google-api-java-client-1.5.0-beta\dependencies （导致错误的罐子），然后它会编译但崩溃，因为
11-02 20:44:27.093: WARN/System.err(485): java.lang.NoClassDefFoundError: com.google.gdata.client.books.BooksService
我的安卓代码如下：
import java.net.URL;
import com.google.gdata.client.books.BooksService;
import com.google.gdata.client.books.VolumeQuery;
import com.google.gdata.data.books.VolumeEntry;
import com.google.gdata.data.books.VolumeFeed;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AndroidBooksApiActivity extends Activity {
Button btnSearch;
TextView tvTitle,tvISBN,tvAuthor,tvDatePublished;
EditText etSearch;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnSearch=(Button)findViewById(R.id.btnFindBook);
tvTitle=(TextView)findViewById(R.id.tvTitle);
tvISBN=(TextView)findViewById(R.id.tvISBN);
tvAuthor=(TextView)findViewById(R.id.tvAuthor);
tvDatePublished=(TextView)findViewById(R.id.tvDatePublished);
etSearch=(EditText)findViewById(R.id.etSearch);
btnSearch.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try
{
//String isbn;
//isbn=etSearch.getText().toString();
String isbn = "9780262140874";
BooksService booksService = new BooksService("UAH");
URL url = new URL("http://www.google.com/books/feeds/volumes/?q=ISBN%3C" + isbn + "%3E");
VolumeQuery volumeQuery = new VolumeQuery(url);
VolumeFeed volumeFeed = booksService.query(volumeQuery, VolumeFeed.class);
VolumeEntry bookInfo=volumeFeed.getEntries().get(0);
tvTitle.setText("Title: " + bookInfo.getTitles().get(0));
tvISBN.setText("ISBN: " + isbn);
tvAuthor.setText("Authors: " + bookInfo.getCreators());
tvDatePublished.setText("DatePublished: "+bookInfo.getDates()+"\n");
}catch(Throwable ex){tvTitle.setText(ex.getMessage()); ex.printStackTrace();}
}
});
}
}
如果您还有什么问题，我会尽我所能回答。我仍在学习，所以我的错误可能很简单，我只是没有看到。
java.lang.IllegalArgumentException: already added: Lcom/google/common/annotations/GwtCompatible;
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.dex.file.DexFile.add(DexFile.java:143)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main.processClass(Main.java:372)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main.processFileBytes(Main.java:346)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main.access$400(Main.java:59)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:294)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:244)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main.processOne(Main.java:313)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main.processAllFiles(Main.java:233)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.dx.command.dexer.Main.run(Main.java:185)
[2011-11-03 14:25:51 - androidBooksApi] Dx at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[2011-11-03 14:25:51 - androidBooksApi] Dx at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[2011-11-03 14:25:51 - androidBooksApi] Dx at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[2011-11-03 14:25:51 - androidBooksApi] Dx at java.lang.reflect.Method.invoke(Unknown Source)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.ide.eclipse.adt.internal.build.DexWrapper.run(DexWrapper.java:179)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.ide.eclipse.adt.internal.build.BuildHelper.executeDx(BuildHelper.java:652)
[2011-11-03 14:25:51 - androidBooksApi] Dx at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:510)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
[2011-11-03 14:25:51 - androidBooksApi] Dx at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
[2011-11-03 14:25:53 - androidBooksApi] Dx warning: Ignoring InnerClasses attribute for an anonymous inner class
(org.joda.time.DateTimeZone$1) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class.
[2011-11-03 14:25:57 - androidBooksApi] Dx
trouble processing "javax/transaction/HeuristicCommitException.class":
Ill-advised or mistaken usage of a core class (java.* or javax.*)
when not building a core library.
This is often due to inadvertently including a core library file
in your application's project, when using an IDE (such as
Eclipse). If you are sure you're not intentionally defining a
core class, then this is the most likely explanation of what's
going on.
However, you might actually be trying to define a class in a core
namespace, the source of which you may have taken, for example,
from a non-Android virtual machine project. This will most
assuredly not work. At a minimum, it jeopardizes the
compatibility of your app with future versions of the platform.
It is also often of questionable legality.
If you really intend to build a core library -- which is only
appropriate as part of creating a full virtual machine
distribution, as opposed to compiling an application -- then use
the "--core-library" option to suppress this error message.
If you go ahead and use "--core-library" but are in fact
building an application, then be forewarned that your application
will still fail to build or run, at some point. Please be
prepared for angry customers who find, for example, that your
application ceases to function once they upgrade their operating
system. You will be to blame for this problem.
If you are legitimately using some code that happens to be in a
core package, then the easiest safe alternative you have is to
repackage that code. That is, move the classes in question into
your own package namespace. This means that they will never be in
conflict with core system classes. JarJar is a tool that may help
you in this endeavor. If you find that you cannot do this, then
that is an indication that the path you are on will ultimately
lead to pain, suffering, grief, and lamentation.
[2011-11-03 14:25:57 - androidBooksApi] Dx 2 errors; aborting
[2011-11-03 14:25:57 - androidBooksApi] Conversion to Dalvik format failed with error 1
我已经尝试使用 gdata-src.java-1.46.0.zip\gdata\java\deps 中的 deps 并再次适用于 java 应用程序但不适用于 android 应用程序。当我在 android 应用程序中使用 deps 文件夹时，它说
11-03 20:48:50.894: WARN/System.err(334): java.lang.NoClassDefFoundError: com.google.gdata.client.books.BooksService
我知道这不可能是因为 java 应用程序有一个定义。