Android Intent ACTION_VIEW 无法从外部 SD 卡打开文件

Question

当用户选择文件时，它会触发此代码...

public static void openFiles(File file, Context context) {
        Uri uri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID, file);
        MimeTypeMap mimeType = MimeTypeMap.getSingleton();
        String type = mimeType.getMimeTypeFromExtension(file.getName().substring(file.getName().lastIndexOf(".") + 1).toLowerCase());
        //Toast.makeText(context, type, Toast.LENGTH_SHORT).show();
        if (type == null) type = "*/*";
        Intent share = new Intent(Intent.ACTION_VIEW);
        share.setDataAndType(uri, type);
        share.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        context.startActivity(share);
        //context.startActivity(Intent.createChooser(share, file.getName()));
    }

问题

当我从内部存储中选择文件时，它工作正常，但是当我尝试从外部 SD 卡打开文件时，出现此异常

I/ViewRootImpl@f0cb2c4[MainActivity]: ViewPostIme pointer 0
I/ViewRootImpl@f0cb2c4[MainActivity]: ViewPostIme pointer 1
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.files, PID: 21495
    java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/5A85-D438/DCIM/Camera/20200406_100806.jpg
        at androidx.core.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:744)
        at androidx.core.content.FileProvider.getUriForFile(FileProvider.java:418)
        at com.example.files.JFileAdapter.openFiles(MainActivity.java:596)
        at com.example.files.JFileAdapter.clickItem(MainActivity.java:579)
        at com.example.files.JFileAdapter.lambda$getView$0$JFileAdapter(MainActivity.java:501)
        at com.example.files.-$$Lambda$JFileAdapter$7O8geCTLRGHMEPzMgOfCRCbnWso.onClick(Unknown Source:8)
        at android.view.View.performClick(View.java:7862)
        at android.view.View.performClickInternal(View.java:7831)
        at android.view.View.access$3600(View.java:879)
        at android.view.View$PerformClick.run(View.java:29359)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:237)
        at android.app.ActivityThread.main(ActivityThread.java:8167)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)
I/Process: Sending signal. PID: 21495 SIG: 9

res/xml/文件路径

<?xml version="1.0" encoding="utf-8"?>
<paths >
    <cache-path name="cache" path="." />
    <files-path name="files" path="." />
    <external-path name="files" path="." />
</paths>

清单

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

我做错了什么，他无法打开外部 SD 卡文件？

Answer 1

FileProvider 通常不通过可移动微型 SD 卡提供服务。

但对于 Android 10 - 如果您在 xml 文件中添加一行即可：

<root-path name="root" path="." />

您甚至可以删除所有其他路径声明。