Android-选择并查看任何类型的文件 [英] Android - Pick and View a file of any type

问题描述

我想让用户能够选择手机中的任何文件类型，然后使用intent再次查看.

I want to lets users able to pick any file type in their phones, then view it again using intent.

要选择文件项，我要这样写(我使用的是Kotlin，Java中的同样问题):

To pick file item I write this ( I'm using Kotlin, same issue in Java):

    fun goToDocumentPicker() {
        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
        intent.addCategory(Intent.CATEGORY_OPENABLE)
        intent.type = "*/*"
        if (intent.resolveActivity(mContext.packageManager) != null)
            mContext.startActivityForResult(intent, REQUEST_DOCUMENT)
    }

并显示选择的项目:

 fun showDocumentPreviewer(uri: Uri) {
        val i = Intent(Intent.ACTION_VIEW)
        i.data = uri
        mContext.startActivity(i)
    }

文档选择器工作正常，在onActivityResult中，我可以接收所选文档的Uri对象，但是文档预览器无法打开该对象.已经尝试将mime-type设置为预览器的意图，但未成功.我是否使用错误的方式在Android中打开文件?有什么通用的方法可以显示Android中的任何文件类型? (因为我想支持许多文件类型)

The document picker works fine, in the onActivityResult I can receive the Uri object of selected document, but the document previewer can't open the object. Already try to set mime-type to the previewer's intent but not success. Did I use incorrect way to open file in Android? Any generic way to show any file type in Android? (Because I want to support many file types)

选择了Uri:content://com.android.providers.media.documents/document/image:80

更新: 基于@CommonsWare的评论，我编辑了预览功能，如下所示:

Update: Base on @CommonsWare's comment, I edited the preview function like below:

fun showAttachmentPreviewer(uri: Uri, mimeType: String?) {
    Log.d("TEST", "Preview " + uri.toString())
    val intent = Intent(Intent.ACTION_VIEW, uri)
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)

    val chooser = Intent.createChooser(intent, "Open with")
    if (intent.resolveActivity(mContext.packageManager) != null)
        mContext.startActivity(chooser)
    else
        mContext.showSnackBar("No suitable application to open file")
}

现在，应用程序始终崩溃，并显示以下崩溃日志:

Now the app always crash with below crash-log:

java.lang.SecurityException:Uid 10202没有uri的权限 0 @ content://com.android.providers.media.documents/document/audio:17915

java.lang.SecurityException: Uid 10202 does not have permission to uri 0 @ content://com.android.providers.media.documents/document/audio:17915

更新2: 我的应用程序在mContext.startActivity(chooser)行崩溃.这是完整的崩溃日志:

Update 2: My app crash at line mContext.startActivity(chooser). Here is the full crash-log:

致命异常:主要 流程:com.makeit.lite，PID:12851 java.lang.SecurityException:Uid 10477没有对uri的许可 0 @ 内容://com.android.providers.media.documents/document/image:24776 在android.os.Parcel.readException(Parcel.java:1540) 在android.os.Parcel.readException(Parcel.java:1493) 在 android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2514) 在 android.app.Instrumentation.execStartActivity(Instrumentation.java:1494) 在android.app.Activity.startActivityForResult(Activity.java:3913) 在 android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50) 在 android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79) 在android.app.Activity.startActivityForResult(Activity.java:3860) 在 android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859) 在android.app.Activity.startActivity(Activity.java:4184) 在android.app.Activity.startActivity(Activity.java:4152) 在 com.makeit.lite.attachment.AttachmentNavigator.showAttachmentPreviewer(AttachmentNavigator.kt:92) 在 com.makeit.lite.attachment.list.AttachmentListPresenter.onAttachmentClicked(AttachmentListPresenter.kt:37) 在 com.makeit.lite.attachment.list.AttachmentListFragment $ onViewCreated $ 1.onItemClick(AttachmentListFragment.kt:39) 在 eu.davidea.viewholders.FlexibleViewHolder.onClick(FlexibleViewHolder.java:121) 在android.view.View.performClick(View.java:5156) 在android.view.View $ PerformClick.run(View.java:20755) 在android.os.Handler.handleCallback(Handler.java:739) 在android.os.Handler.dispatchMessage(Handler.java:95) 在android.os.Looper.loop(Looper.java:145) 在android.app.ActivityThread.main(ActivityThread.java:5835) 在java.lang.reflect.Method.invoke(本机方法) 在java.lang.reflect.Method.invoke(Method.java:372) 在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1399) 在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

FATAL EXCEPTION: main Process: com.makeit.lite, PID: 12851 java.lang.SecurityException: Uid 10477 does not have permission to uri 0 @ content://com.android.providers.media.documents/document/image:24776 at android.os.Parcel.readException(Parcel.java:1540) at android.os.Parcel.readException(Parcel.java:1493) at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2514) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1494) at android.app.Activity.startActivityForResult(Activity.java:3913) at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79) at android.app.Activity.startActivityForResult(Activity.java:3860) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859) at android.app.Activity.startActivity(Activity.java:4184) at android.app.Activity.startActivity(Activity.java:4152) at com.makeit.lite.attachment.AttachmentNavigator.showAttachmentPreviewer(AttachmentNavigator.kt:92) at com.makeit.lite.attachment.list.AttachmentListPresenter.onAttachmentClicked(AttachmentListPresenter.kt:37) at com.makeit.lite.attachment.list.AttachmentListFragment$onViewCreated$1.onItemClick(AttachmentListFragment.kt:39) at eu.davidea.viewholders.FlexibleViewHolder.onClick(FlexibleViewHolder.java:121) at android.view.View.performClick(View.java:5156) at android.view.View$PerformClick.run(View.java:20755) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:5835) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

更新3: 如果将mimeType设置为intent:intent.type = mimeType，该应用程序将不再崩溃. mimeType是我从选择器意图中获得的字符串(在content: uri旁边). mimeType值可以为image/jpeg或基于所选文件类型的任何值.尽管不会崩溃，但给定uri的文件也不会显示.如果我从Intent-Chooser中选择Gallery，则图库"将打开并显示所有图像.我猜第三个应用程序不知道如何在给定的uri上确定文件.

Update 3: If I set mimeType to intent: intent.type = mimeType and the app won't crash anymore. The mimeType is the string I get from the picker intent (beside the content: uri). The mimeType value canbe image/jpeg or anything base on selected file type. Although it won't crash, the file at given uri won't display as well. If I choose the Gallery from Intent-Chooser, the Gallery open and show all images. I guess the 3rd app don't know how to determinate the file at given uri.

这是我功能的最新来源:

Here is the latest source of my function:

fun showAttachmentPreviewer(uri: Uri, mimeType: String?) {
        Log.d("TEST", "Preview " + uri.toString() + " For type" + mimeType)
        val intent = Intent(Intent.ACTION_VIEW, uri)
        intent.type = mimeType //Can be "image/jpeg" or sth corresponding to the filetype.
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
        val chooser = Intent.createChooser(intent, "Open with")
        if (intent.resolveActivity(mContext.packageManager) != null)
            mContext.startActivity(chooser)
        else
            mContext.showSnackBar("No suitable application to open file")
    }

推荐答案

我首先要对@ GreenApps，@ Ankit和@CommonsWare表示感谢.谁花时间调查我的问题.

Fist of all, I want to say thank-you to @GreenApps, @Ankit, and @CommonsWare. Who spent time to investigate my issue.

我终于找到了将源代码提取到分离的简单项目中的根本原因.这是因为我以这种方式将uri-string解析为uri-instance(我的问题中没有包含root-cause的代码.我很抱歉):

I finally found the root cause when extracting the source to separated simple project. It's because I parse uri-string into uri-instance this way (the code of root-cause didn't included in my question. My apologies):

val uri = Uri.parse(URLDecoder.decode(uriString, "UTF-8")) as Uri

当我更改为val uri = Uri.parse(uriString)时，问题已解决.

when I changed to val uri = Uri.parse(uriString) them problem solved.

顺便说一句，我想在我的Github中共享用于选择器和预览器的示例代码，因为有人可能需要看看. Java源位于master分支上，而Kotlin源位于kotlin-version分支上.现在，使用此简单代码，我可以选择任何文件类型(图像，音频，视频，pdf，xlsx等)，然后稍后通过Intent.ACTION_VIEW将其打开.

Btw, I want to share the sample code for picker and previewer in my Github for someone may need to take a look. The java source is on master branch, and the Kotlin source is on kotlin-version branch. Using this simple code, now I can pick any file type (image, audio, video, pdf, xlsx,...) and then open it later via Intent.ACTION_VIEW.

这里是:

https://github.com/IHNEL/UriPickerPreviewer

这篇关于Android-选择并查看任何类型的文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！