相关疑难解决方法(0)

似乎它是唯一不依赖于MuPDF的免费android的pdf阅读器.

我试图证明它,我已经下载了项目,但是为了运行它,我得到了例外:

01-17 13:45:03.960: E/AndroidRuntime(13631): FATAL EXCEPTION: main
01-17 13:45:03.960: E/AndroidRuntime(13631): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{net.sf.andpdf.pdfviewer/net.sf.andpdf.pdfviewer.PdfViewerActivity}: java.lang.InstantiationException: can't instantiate class net.sf.andpdf.pdfviewer.PdfViewerActivity
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1894)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.app.ActivityThread.access$600(ActivityThread.java:128)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.os.Looper.loop(Looper.java:137)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at android.app.ActivityThread.main(ActivityThread.java:4514)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at java.lang.reflect.Method.invokeNative(Native Method)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at java.lang.reflect.Method.invoke(Method.java:511)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
01-17 13:45:03.960: E/AndroidRuntime(13631):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) …

为什么每次我尝试使用以下代码在我的SDCARD中打开pdf文件时,它实际上并不打开pdf文件本身,而是进入adobe reader菜单？我的代码有什么问题吗？

Intent intent = new Intent();
    File pdfFile = new File("/sdcard/sample.pdf");
    Uri path = Uri.fromFile(pdfFile);
    intent.setAction(Intent.ACTION_VIEW); 
    intent.setData(path);
    intent.setType("application/pdf");
    intent.setPackage("com.adobe.reader");
    startActivity(intent);