Android运行时错误"java.lang.NoClassDefFoundError:org.apache.commons.collections.CollectionUtils"

Question

我想在Android中使用org.apache.commons.collections.CollectionUtils.样品如下

import java.util.ArrayList;

import org.apache.commons.collections.CollectionUtils;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class CheckCommonsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String email1 = "xyz@gmail.com";
    String email2 = "abc@gmail.com";
    String email3 = "mnp@gmail.com";
    String email4 = null;       

    ArrayList<String> emailList1 = new ArrayList<String>();
    emailList1.add(email4);
    emailList1.add(email1);
    emailList1.add(email2);
    emailList1.add(email3);

    ArrayList<String> emailList2 = new ArrayList<String>();
    emailList2.add(email3);
    emailList2.add(email2);
    emailList2.add(email1);

    boolean isEqual = CollectionUtils.isEqualCollection(emailList1,
 emailList2);
    TextView text = (TextView) findViewById(R.id.text);
    text.setText(String.valueOf(isEqual));
   }
 }

我已将commons-collections-3.2.1.jar导入到Android项目的Build Path中,但我java.lang.NoClassDefFoundError: org.apache.commons.collections.CollectionUtils在运行时遇到错误.

EDIT1

谢谢

Answer 1

你必须把库放在你的android项目的/ libs(不是/ lib)文件夹中

编辑:我假设你把它放在/ lib文件夹中,因为这是一个常见的失败.在您添加的屏幕截图中可以看到您将lib作为外部jar包含在内.无论如何..无论你把它放在/ lib还是作为外部jar,解决方案都是一样的:create/libs文件夹并将lib放在那里