我有一个库项目,它是MUPDF渲染库。我正在使用我的OPENER项目,要求图书馆项目显示PDF。就像这样:NullPointer打开pdf时出现异常(MUPDF Android)
String s= Environment.getExternalStorageDirectory().getAbsolutePath().toString()+"/Download/Adobe Reader/Getting Started with Adobe Reader.pdf";
Uri uri = Uri.parse(s);
Intent intent = new Intent(getBaseContext(), MuPDFActivity.class);
intent.setAction(Intent.ACTION_VIEW);
intent.setData(uri);
startActivity(intent);
我认为PDF确实打开(我看不到它曾经),因为logcat中这样说:
12月7日至16日:21:02.678:d/dalvikvm(2317 ):无JNI_OnLoad在 发现/data/data/com.example.opener/lib/libmupdf.so 0xa6ac31c8,跳过 初始化十二月7日至16日:21:02.690:E/libmupdf(2317):打开文件 ... 07-16 12:21:02.706:I/alert(2317):alert_init 07-16 12:21:02.706: E/libmupdf(231 7):完成! 12月7日至16日:21:02.738:d/dalvikvm(2317): GC_CONCURRENT释放181K,3%的游离8176K/8391K,暂停13毫秒+ 0毫秒,总 22毫秒
但上述消息后,我得到一个nullpointerException。这里是完整的错误信息:
07-16 12:21:02.830: E/AndroidRuntime(2317): FATAL EXCEPTION: main
07-16 12:21:02.830: E/AndroidRuntime(2317): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.opener/com.artifex.mupdflib.MuPDFActivity}: java.lang.NullPointerException
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.ActivityThread.access$600(ActivityThread.java:130)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.os.Handler.dispatchMessage(Handler.java:99)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.os.Looper.loop(Looper.java:137)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.ActivityThread.main(ActivityThread.java:4745)
07-16 12:21:02.830: E/AndroidRuntime(2317): at java.lang.reflect.Method.invokeNative(Native Method)
07-16 12:21:02.830: E/AndroidRuntime(2317): at java.lang.reflect.Method.invoke(Method.java:511)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-16 12:21:02.830: E/AndroidRuntime(2317): at dalvik.system.NativeStart.main(Native Method)
07-16 12:21:02.830: E/AndroidRuntime(2317): Caused by: java.lang.NullPointerException
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.CallbackApplication$MuPDFCallbackClass.sendGaiView(CallbackApplication.java:16)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.MuPDFActivity.updatePageNumView(MuPDFActivity.java:966)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.MuPDFActivity.access$5(MuPDFActivity.java:949)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.MuPDFActivity$4.onMoveToChild(MuPDFActivity.java:430)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.ReaderView.setDisplayedViewIndex(ReaderView.java:94)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.MuPDFActivity.createUI(MuPDFActivity.java:654)
07-16 12:21:02.830: E/AndroidRuntime(2317): at com.artifex.mupdflib.MuPDFActivity.onCreate(MuPDFActivity.java:396)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.Activity.performCreate(Activity.java:5008)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
07-16 12:21:02.830: E/AndroidRuntime(2317): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
问题是什么,我哪里出错了?
你有没有调试的代码呢? – JamesB
我从github.https://github.com/joniks/Android-MuPDF下载了代码 –
这不能回答我的问题。 – JamesB