Android 打开pdf时发生java.lang.NoClassDefFoundError

我正在尝试实现一个pdf查看器，该应用程序用于检测存储在sd卡中的pdf，如图所示。

但当我点击任何文件查看它时。。。错误

这是LOGCAT：

06-28 07:32:46.963: WARN/dalvikvm(330): Unable to resolve superclass of Lcom/example/trypdf/Second; (496)
06-28 07:32:46.983: WARN/dalvikvm(330): Link of class 'Lcom/example/trypdf/Second;' failed
06-28 07:32:46.983: ERROR/dalvikvm(330): Could not find class 'com.example.trypdf.Second', referenced from method com.example.trypdf.PDFViewerActivity.openPdfIntent
06-28 07:32:47.013: WARN/dalvikvm(330): VFY: unable to resolve const-class 419 (Lcom/example/trypdf/Second;) in Lcom/example/trypdf/PDFViewerActivity;
06-28 07:32:47.013: DEBUG/dalvikvm(330): VFY: replacing opcode 0x1c at 0x0002
06-28 07:32:47.013: DEBUG/dalvikvm(330): VFY: dead code 0x0004-000e in Lcom/example/trypdf/PDFViewerActivity;.openPdfIntent (Ljava/lang/String;)V
06-28 07:32:47.373: INFO/ActivityManager(59): Displayed activity com.example.trypdf/.PDFViewerActivity: 1665 ms (total 1665 ms)
06-28 07:32:52.593: DEBUG/dalvikvm(131): GC_EXPLICIT freed 1336 objects / 74064 bytes in 149ms
06-28 07:33:28.634: DEBUG/SntpClient(59): request time failed: java.net.SocketException: Address family not supported by protocol
06-28 07:33:55.655: DEBUG/AndroidRuntime(330): Shutting down VM
06-28 07:33:55.663: WARN/dalvikvm(330): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
06-28 07:33:55.684: ERROR/AndroidRuntime(330): FATAL EXCEPTION: main
06-28 07:33:55.684: ERROR/AndroidRuntime(330): java.lang.NoClassDefFoundError: com.example.trypdf.Second
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at com.example.trypdf.PDFViewerActivity.openPdfIntent(PDFViewerActivity.java:46)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at com.example.trypdf.PDFViewerActivity.onListItemClick(PDFViewerActivity.java:41)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.app.ListActivity$2.onItemClick(ListActivity.java:321)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.widget.ListView.performItemClick(ListView.java:3382)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.os.Handler.handleCallback(Handler.java:587)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.os.Looper.loop(Looper.java:123)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at android.app.ActivityThread.main(ActivityThread.java:4627)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at java.lang.reflect.Method.invokeNative(Native Method)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at java.lang.reflect.Method.invoke(Method.java:521)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-28 07:33:55.684: ERROR/AndroidRuntime(330):     at dalvik.system.NativeStart.main(Native Method)
06-28 07:33:55.693: WARN/ActivityManager(59):   Force finishing activity com.example.trypdf/.PDFViewerActivity
06-28 07:33:56.213: WARN/ActivityManager(59): Activity pause timeout for HistoryRecord{44fe47a0 com.example.trypdf/.PDFViewerActivity}

我几乎什么都试过了：

• 创建新项目并复制类
• 使用其他目标（API lvl10），（2.2，_lvl8）
• 清洁和建设
• 重置亚洲开发银行
• 使用从其他站点下载的PDFViewer库

但我总是犯同样的错误：

06-28 07:32:46.983: ERROR/dalvikvm(330): Could not find class 'com.example.trypdf.Second', referenced from method com.example.trypdf.PDFViewerActivity.openPdfIntent
06-28 07:33:55.684: ERROR/AndroidRuntime(330): java.lang.NoClassDefFoundError: com.example.trypdf.Second

在这里，您还可以看到我的两个类以及清单

PDFViewerActivity.java

  package com.example.trypdf;

import java.io.File;
import java.io.FilenameFilter;

import com.example.trypdf.Second;
import net.sf.andpdf.pdfviewer.PdfViewerActivity;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class PDFViewerActivity extends ListActivity {

    String[] pdflist;
    File[] imagelist;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);

        File images = Environment.getExternalStorageDirectory();
        imagelist = images.listFiles(new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return ((name.endsWith(".pdf")));
            }
        });
        pdflist = new String[imagelist.length];
        for (int i = 0; i < imagelist.length; i++) {
            pdflist[i] = imagelist[i].getName();
        }
        this.setListAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, pdflist));
    }

    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        String path = imagelist[(int) id].getAbsolutePath();
        openPdfIntent(path);
    }

    private void openPdfIntent(String path) {
        try {
            final Intent intent = new Intent(PDFViewerActivity.this, Second.class);
            intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, path);
            startActivity(intent);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

显示

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.trypdf"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
 <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="com.example.trypdf.PDFViewerActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
        android:name="com.example.trypdf.Second"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
</manifest>

---

谢谢

要解决此问题，您需要：

在项目中创建一个命名的“libs”文件夹。 2将项目所需的库导入到此新文件夹。 2.1. 要导入它们：右键单击libs文件夹-->导入-->文件系统-->选择.jar并接受

清理、构建和引导

---

资料来源：

快速、简单、非常好的答案！你也可以投票支持这个答案，因为现在你已经有了投票权

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.trypdf"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
 <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="com.example.trypdf.PDFViewerActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
        android:name="com.example.trypdf.Second"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
</manifest>