当我收到以下错误时,我正在我的项目中实现 pdf 阅读器..
E/AndroidRuntime(1495): FATAL EXCEPTION: main
E/AndroidRuntime(1495): Process: com.example.testqstn, PID: 1495
E/AndroidRuntime(1495): java.lang.NoClassDefFoundError: com.questionpoint.pdf.Pdf
E/AndroidRuntime(1495): at com.question_point.main.Question_Point_Main.openPdfIntent(Question_Point_Main.java:272)
E/AndroidRuntime(1495): at com.question_point.main.Question_Point_Main.CopyReadAssets(Question_Point_Main.java:266)
E/AndroidRuntime(1495): at com.question_point.main.Question_Point_Main.pdfSelection(Question_Point_Main.java:128)
E/AndroidRuntime(1495): at com.question_point.main.Question_Point_Main$2.onClick(Question_Point_Main.java:104)
E/AndroidRuntime(1495): at android.view.View.performClick(View.java:4438)
E/AndroidRuntime(1495): at android.view.View$PerformClick.run(View.java:18422)
E/AndroidRuntime(1495): at android.os.Handler.handleCallback(Handler.java:733)
E/AndroidRuntime(1495): at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(1495): at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime(1495): at android.app.ActivityThread.main(ActivityThread.java:5017)
E/AndroidRuntime(1495): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(1495): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(1495): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
E/AndroidRuntime(1495): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
E/AndroidRuntime(1495): at dalvik.system.NativeStart.main(Native Method)
I/Process(1495): Sending signal. PID: 1495 SIG: 9
我已将一个项目导入到我的代码中..我的库文件名为 libs,并且我已反复清理我的项目..但错误仍然存在..提前致谢..
导致错误的代码
public void CopyReadAssets(String url) {
AssetManager assetManager = getAssets();
InputStream in = null;
OutputStream out = null;
File file = new File(getFilesDir(), url);
try {
in = assetManager.open(url);
out = openFileOutput(file.getName(),
Context.MODE_WORLD_READABLE);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
}
catch (Exception e) {
Log.e("tag", e.getMessage());
}
String path = "file://" + getFilesDir() + "/"+url;
openPdfIntent(path);
}
private void openPdfIntent(String path) {
// TODO Auto-generated method stub
try {
final Intent intent = new Intent(Question_Point_Main.this, Pdf.class);
intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, path);
startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
最佳答案
尝试以下步骤:
第1步:创建一个文件夹“lib”,并将所有第三方jar复制到此处;
第 2 步:将这些 jar 添加到构建路径;
第 3 步:使用该文件夹作为源文件夹(如下所示)。
关于java.lang.NoClassDefFoundError,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22472774/