什么是 com.google.android.apps.nbu.files.provider/2? [英] What is com.google.android.apps.nbu.files.provider/2?

问题描述

我打开了来自不同来源的 pdf 文件并得到了这个 Intents:

I've opened pdf file from different sources and got this Intents:

1. 文件管理器(Google 文件)->内部存储 ->下载:Intent { act=android.intent.action.VIEW dat=content://com.google.android.apps.nbu.files.provider/1/file:///storage/emulated/0/Download/Untitled.pdf typ=application/pdf flg=0x13000001 cmp=team.sls.testapp/.ActivityMain }

文件管理器(Google 文件)->下载:Intent { act=android.intent.action.VIEW dat=content://com.google.android.apps.nbu.files.provider/2/1863 typ=application/pdf flg=0x13000001 cmp=team.sls.testapp/.ActivityMain }

File manager (Google Files) -> Downloads: Intent { act=android.intent.action.VIEW dat=content://com.google.android.apps.nbu.files.provider/2/1863 typ=application/pdf flg=0x13000001 cmp=team.sls.testapp/.ActivityMain }

下载管理器(来自通知面板):Intent { act=android.intent.action.VIEW dat=content://com.android.providers.downloads.documents/document/1508 typ=application/pdf flg=0x13000003 cmp=team.sls.testapp/.ActivityMain }

Dowdload manager (from notification panel): Intent { act=android.intent.action.VIEW dat=content://com.android.providers.downloads.documents/document/1508 typ=application/pdf flg=0x13000003 cmp=team.sls.testapp/.ActivityMain }

电报聊天:Intent { act=android.intent.action.VIEW dat=content://org.telegram.messenger.provider/media/Telegram/Telegram Documents/2_5276292126848585208.pdf typ=application/pdf flg=0x13000001 cmp=team.sls.testapp/.ActivityMain }

什么是 content://com.google.android.apps.nbu.files.provider/2/1863，为什么同一文件的路径不同?但更有趣的是 - 为什么情况 1 和 4 可以打开带有自定义扩展名的文件，而情况 2 和 3 却不能?

What is content://com.google.android.apps.nbu.files.provider/2/1863 and why the path to same file is different? But more interesting - why cases 1 and 4 can open files with custom extensions but 2 and 3 don't?

如果对案例 1 和案例 2 有误解，请查看这个问题中的截图

If there is a misunderstanding with cases 1 and 2, take a look to screenshots in this question

推荐答案

所有这四个 Uri 都遵循相同的模式

All these four Uri's are following the same pattern

content://com.google.android.apps.nbu.files.provider/1/file:///storage/emulated/0/Download/Untitled.pdf
content://com.google.android.apps.nbu.files.provider/2/1863
content://com.android.providers.downloads.documents/document/1508
content://org.telegram.messenger.provider/media/Telegram/Telegram Documents/2_5276292126848585208.pdf

content://PACKAGE_NAME.provider/CONTENT_DETAIL

content://PACKAGE_NAME.provider/CONTENT_DETAIL

• 显然，PACKAGE_NAME 取决于应用程序.
• CONTENT_DETAIL 是可选的，可以是 file_id 或 full_path.

• Obviously the PACKAGE_NAME depends on application.
• And the CONTENT_DETAIL is optional, either file_id or full_path.

如果您反编译所有这四个应用程序并查看它们的 AndroidManifest.xml，您将看到相同的 provider 标记，但有细微差别.

If you decompile all these four applications and look at their AndroidManifest.xml you will see the same provider tag with minor differences.

查看 Google Files 的 AndroidManifest.xml

Look at Google Files's AndroidManifest.xml

<application>
  <provider 
    android:name="com.google.android.libraries.storage.storagelib.FileProvider" 
    android:exported="false" 
    android:authorities="com.google.android.apps.nbu.files.provider" 
    android:grantUriPermissions="true"/>
</application>

此提供程序将生成如下所示的 HierarchicalUricontent://com.google.android.apps.nbu.files.provider/1651/2

This provider will generate the HierarchicalUri's like bellow content://com.google.android.apps.nbu.files.provider/1651/2

使用下面的代码段，您可以从所有这四个应用程序中读取文件/内容.

Using the snippet bellow, you can read file/content from all those four application's.

public final class MainActivity extends AppCompatActivity{

   @Override
    protected void onCreate(Bundle savedInstanceState) {
      Intent intent = getIntent();
      InputStream is = getContentResolver().openInputStream(intent.getData());
      String content = new String(Utils.unwrap(is));
      Log.i("TAG", "content: " + content);
   }

   public static byte[] unwrap(InputStream is) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int nRead;
        byte[] data = new byte[4096];
        while ((nRead = is.read(data, 0, data.length)) != -1) {
            baos.write(data, 0, nRead);
        }
        baos.flush();
        is.close();
        baos.close();
        return baos.toByteArray();
   }
}

我希望我已经回答了你的问题.

I hope i have answered your question.

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