Question

我尝试在Oreo中打开PDF文件，但无法打开。我没有任何错误。有什么问题PDF文件无法打开。仅显示黑屏。在logcat中没有错误显示。怎么了？

如何解决此问题？我提到了许多链接，但没有得到解决方案。我也尝试了很多代码，但没有帮助。

我的代码是：

   File file11 = new File(Environment.getExternalStorageDirectory().
   getAbsolutePath(), 
   "AtmiyaImages/" + nameoffile1);
    Intent target = new Intent(Intent.ACTION_VIEW);
    target.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if(Build.VERSION.SDK_INT>24){
        Uri uri=FileProvider.getUriForFile(AssignmentActivity.this,
        getPackageName()+".provider",file11);
        target.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);
        target.putExtra(Intent.EXTRA_STREAM,uri);
        target.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        target.setType("application/pdf");
        Intent intent=Intent.createChooser(target,"Open File");
        try
        {
        startActivity(intent);
        }
        catch(ActivityNotFoundException e)
        {
        Toast.makeText(AssignmentActivity.this,"No Apps 
       can performs This acttion",Toast.LENGTH_LONG).show();
        }
        }

        else
        {
        target.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        target.setDataAndType(Uri.fromFile(file11),"application/pdf");
        target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
        Intent intent=Intent.createChooser(target,"Open File");
        try
        {
        startActivity(intent);
        }
        catch(ActivityNotFoundException e)
        {
        Toast.makeText(AssignmentActivity.this,"No Apps can performs This 
        acttion",Toast.LENGTH_LONG).show();
        }

        }

在清单中，我还添加

   <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.infinity.infoway.atmiya.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
       </provider>

我的 Xml代码是：

 <?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
 name="Phonestorage"
path="/storage/emulated/0/AtmiyaImages"/>
</paths>

Answer 1

一些调整Bhoomika的答案对我有用

xml/providers_path.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path name="files" path="."/>
</paths>

AndroidManifest.xml

<provider
         android:name="androidx.core.content.FileProvider"
         android:authorities="APPLICATION_ID.provider"
         android:exported="false"
         android:grantUriPermissions="true">
         <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
</provider>

Kotlin扩展功能可从活动中打开PDF

fun Activity.openPdf(filename: String?) {
    val file =  File(filesDir, filename)

    if(file.exists()) {
        Intent(Intent.ACTION_VIEW).apply {
            setDataAndType(FileProvider.getUriForFile(this@openPdf, BuildConfig.APPLICATION_ID + ".provider", file), "application/pdf")
            flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
            try {
                startActivity(this)
            } catch (e: Exception) {
                showErrorDialog(unable_to_open_doc)
            }
        }
    } else {
        showErrorDialog(file_doesnt_exist)
    }
}

Answer 2

将路径值替换为“”。 -看下面：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

在清单中，“提供程序”代码是这样的，您的代码也是如此。

<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths" />
        </provider>

要访问正确的文件路径，请遵循以下代码：

File  pdfFile = new File(getExternalFilesDir(GlobalUtils.AppFolder), fileName);
     Uri path = FileProvider.getUriForFile(this, BuildConfig.APPLICATION_ID + ".provider", pdfFile);
                Log.e("create pdf uri path==>", "" + path);

                try {
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(path, "application/pdf");
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    startActivity(intent);
                    finish();
                } catch (ActivityNotFoundException e) {
                    Toast.makeText(getApplicationContext(),
                            "There is no any PDF Viewer",
                            Toast.LENGTH_SHORT).show();
                    finish();
                }

希望这会对您有所帮助。

如何打开Oreo内部存储器中的PDF文件？

2 个答案: