android - 来自 MediaDocumentsProvider 的权限拒绝

Question

我有这些作为我的权限:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.MANAGE_DOCUMENTS" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

我在 openInputStream 行收到权限拒绝错误:

if(bgUri != null && !bgUri.isEmpty()) {
            try {
                InputStream inputStream = context.getContentResolver().openInputStream(Uri.parse(bgUri));   // <-- error
                return Drawable.createFromStream(inputStream, bgUri);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

我首先加载我的图像

@Override
public void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
    if (requestCode == SELECT_PHOTO && resultCode == Activity.RESULT_OK) {
        try {
            final Uri imageUri = imageReturnedIntent.getData();

            final int takeFlags = imageReturnedIntent.getFlags()
                    & (Intent.FLAG_GRANT_READ_URI_PERMISSION
                    | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
            // Check for the freshest data.
            mContext.getContentResolver().takePersistableUriPermission(imageUri, takeFlags);

然后保存图片uri:

            String backgroundURI = imageUri.toString();
            int backgroundID = 0;
            mStore.backgroundImageURI = backgroundURI;
            mStore.backgroundImageNumber= backgroundID;
            mStore.save();

堆栈跟踪:

﹕ FATAL EXCEPTION: main
Process: com.myapp.pocketandroid, PID: 1284
java.lang.RuntimeException: Unable to resume activity {com.myapp.pocketandroid/com.myapp.pocketandroid.MainActivity}: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.media.MediaDocumentsProvider from ProcessRecord{52946004 1284:com.myapp.pocketandroid/u0a60} (pid=1284, uid=10060) requires android.permission.MANAGE_DOCUMENTS or android.permission.MANAGE_DOCUMENTS
        at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2774)
        at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2803)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2238)
        at android.app.ActivityThread.access$800(ActivityThread.java:135)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5001)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.media.MediaDocumentsProvider from ProcessRecord{52946004 1284:com.myapp.pocketandroid/u0a60} (pid=1284, uid=10060) requires android.permission.MANAGE_DOCUMENTS or android.permission.MANAGE_DOCUMENTS
        at android.os.Parcel.readException(Parcel.java:1465)
        at android.os.Parcel.readException(Parcel.java:1419)
        at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:2848)
        at android.app.ActivityThread.acquireProvider(ActivityThread.java:4399)
        at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2208)
        at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1425)
        at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1047)
        at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:904)
        at android.content.ContentResolver.openInputStream(ContentResolver.java:629)
        at com.myapp.pocketandroid.Utils.BackgroundImageManager.background(BackgroundImageManager.java:29)
        at com.myapp.pocketandroid.BaseActivity.setBackground(BaseActivity.java:83)
        at com.myapp.pocketandroid.BaseActivity.onResume(BaseActivity.java:44)

为什么当我恢复 Activity 并尝试加载 URI 时，MediaDocumentsProvider 权限崩溃？我认为通过获得许可我可以永久保留许可。

Answer 1

看来您正在使用 here 中的“获取最新数据”和来自 here 的 SELECT_PHOTO .正确的？假设是这样---

SELECT_PHOTO 示例使用ACTION_PICK 来选择照片。 Quoting :

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);  

然而，作为pointed out , Intent.ACTION_PICK 不保证持久性。相反，请使用 Intent.ACTION_OPEN_DOCUMENT。来自API docs ，适用于 API 19 或更高版本:

All selected documents are returned to the calling application with persistable read and write permission grants. If you want to maintain access to the documents across device reboots, you need to explicitly take the persistable permissions using takePersistableUriPermission(Uri, int).

尝试

Intent photoPickerIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);  

看看你怎么做。