Android (Studio) FileNotFoundException 但文件在 SD 卡上

Question

所以现在我一直在尝试实现 joanzapata 的 pdfview，来自： "http://joanzapata.com/android-pdfview/"

主要关注的是 API-10+ 友好。

无论我做什么，我都会遇到一个或另一个错误，不知何故，现在我的项目正在运行（显然）但是当我找到我的 PDF 文件并尝试使用与项目示例相同的代码加载它时，我得到了以下问题。

首先是我的代码：

...
//File currentLoc = new File(string_pdfLoc);
...
//File thePdf  = currentLoc;
//thePdf is of type File
    if( thePdf != null ) {
        Log.d("MyDebug", "1/3 File not Null");
        if( thePdf.exists() ) {
            Log.d("MyDebug", "2/3 File exists");
            if (thePdf.canRead()) {
                Log.d("MyDebug", "3/3 File can be Read");
                Log.d("MyDebug", "thePDF: " + thePdf.getAbsolutePath());

                //------ PDF should Exist ----------------------
                Log.d("MyDebug","Should now load thePDFView");
                //pdfView.fromAsset(pdfName)
                Log.d("MyDebug","thePDFView.fromAsset");
                thePDFView.fromAsset(thePdf.getAbsolutePath() );
                Log.d("MyDebug","thePDFView.fromAsset.load");
                thePDFView.fromAsset(thePdf.getAbsolutePath() ).load();

            } else {
                Log.d("MyDebug", "File exists, but cannot Read");
            }
        }else{
            Log.d("MyDebug", "File != null, but !exists");
        }
    }else{
        Log.d("MyDebug","thePDF, is still null");
    }

---

现在出现错误，请注意“公司”和“项目名称”通常命名不同，但仍然是小写字符，但我隐藏了它们的名称。

Found a PDF File
D/MyDebug? 1/3 File not Null
D/MyDebug? 2/3 File exists
D/MyDebug? 3/3 File can be Read
D/MyDebug? thePDF: /storage/emulated/0/Android/data/com.projectname.company.projectname/files/ThisisaPDF.pdf
D/MyDebug? Should now load thePDFView
D/MyDebug? thePDFView.fromAsset
D/AndroidRuntime? Shutting down VM
W/dalvikvm? threadid=1: thread exiting with uncaught exception (group=0x41942da0)
E/AndroidRuntime? FATAL EXCEPTION: main
Process: com.projectname.company.projectname, PID: 9591
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.projectname.tpub.projectname/com.projectname.company.projectname.PdfViewActivity}: com.joanzapata.pdfview.exception.FileNotFoundException: /storage/emulated/0/Android/data/com.projectname.company.projectname/files/ThisisaPDF.pdf does not exist.
...
 Caused by: com.joanzapata.pdfview.exception.FileNotFoundException: /storage/emulated/0/Android/data/com.projectname.company.projectname/files/ThisisaPDF.pdf does not exist.
        at com.joanzapata.pdfview.PDFView.fromAsset(PDFView.java:905)
        at     com.projectname.company.projectname.PdfViewActivity.onCreate(PdfViewActivity.java:88)

---

这是我在清单中的权限：

<uses-permission
    android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    />

这是我的 Gradle(app).Build 文件：

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
    compile 'com.android.support:support-v4:21.0.3'
    compile 'com.joanzapata.pdfview:android-pdfview:1.0.+@aar'
}

---

据我所知，应该引入插件，否则我预计会出现一些错误，例如我过去遇到的关于 Gradle 的错误。

欢迎任何建议，我会经常检查，任何建议我都可以轻松尝试并回复。

Answer 1

根据我对the source code 的阅读，fromAsset() 用于阅读资产。请改用fromFile()。