【发布时间】：2011-12-21 20:18:23
【问题描述】：
我正在 Eclipse 中构建一个使用 google-api-java-client 的简单 Android 项目。我正在尝试关注this tutorial 以启动并运行它。我已经通过 SO 搜索了有关如何在 Eclipse 中将 JAR 添加到 Android 项目的答案。他们中的大多数建议将 JAR 添加到 Android 项目内的 lib/ 文件夹中，然后将这些 JAR 添加到项目的构建路径中。这两件事我都做过。该项目编译良好（无论如何，Eclipse 不会抱怨任何错误）。但是当我在模拟器中运行 Android 应用程序时，每当我尝试实例化 google-api-java-client JAR 中的任何类时，我都会得到 ClassDefNotFoundError。例如
new com.google.api.client.http.apache.ApacheHttpTransport();
提高ClassDefNotFoundError。
这是导致错误的代码：
package com.mycom.android;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
public class SearchRunner implements OnClickListener {
private static final String API_KEY = "AIzaSyA1Mg3xWXfoov4HdPUzYY2NwTxuvCev1-E";
private static final String PLACES_SEARCH_URL = "";
@Override
public void onClick(View v) {
EditText editText = (EditText) v;
String searchText = editText.getText().toString();
runSearch(searchText);
}
protected void runSearch(String searchText) {
new com.google.api.client.http.apache.ApacheHttpTransport();
}
}
这是 Eclipse LogCat 的更完整输出：
12-21 15:42:11.402: E/dalvikvm(3412): Could not find class 'com.google.api.client.http.apache.ApacheHttpTransport', referenced from method com.mycom.android.SearchRunner.runSearch
12-21 15:42:11.402: W/dalvikvm(3412): VFY: unable to resolve new-instance 70 (Lcom/google/api/client/http/apache/ApacheHttpTransport;) in Lcom/mycom/android/SearchRunner;
12-21 15:42:11.402: D/dalvikvm(3412): VFY: replacing opcode 0x22 at 0x0000
12-21 15:42:11.402: D/dalvikvm(3412): DexOpt: unable to opt direct call 0x00ca at 0x02 in Lcom/mycom/android/SearchRunner;.runSearch
12-21 15:42:11.682: I/MapActivity(3412): Handling network change notification:CONNECTED
12-21 15:42:11.682: E/MapActivity(3412): Couldn't get connection factory client
12-21 15:42:11.791: D/gralloc_goldfish(3412): Emulator without GPU emulation detected.
12-21 15:42:12.532: D/dalvikvm(3412): GC_CONCURRENT freed 102K, 3% free 10520K/10823K, paused 5ms+7ms
12-21 15:42:18.422: D/AndroidRuntime(3412): Shutting down VM
12-21 15:42:18.422: W/dalvikvm(3412): threadid=1: thread exiting with uncaught exception (group=0x409951f8)
12-21 15:42:18.482: E/AndroidRuntime(3412): FATAL EXCEPTION: main
12-21 15:42:18.482: E/AndroidRuntime(3412): java.lang.NoClassDefFoundError: com.google.api.client.http.apache.ApacheHttpTransport
12-21 15:42:18.482: E/AndroidRuntime(3412): at com.mycom.android.SearchRunner.runSearch(SearchRunner.java:20)
【问题讨论】：