java – 访问DownloadProvider时避免SecurityException

我有一个具有图片mime类型的intent过滤器 android.intent.action.SEND的活动.

一旦用户与我的活动(UploadActivity)共享图片(特别是来自下载管理器),活动将检查用户是否已登录.如果没有,它将存储原始意图(使用EXTRA_STREAM)并将用户发送到LoginActivity.该用户登录后,将使用原始保存的意图将其带回UploadActivity.

现在,即使恢复原始意图,我得到一个java.lang.SecurityException：权限拒绝：阅读com.android.providers.downloads.DownloadProvider uri ….

我理解为什么我会这样做.这是因为我没有原始意图的临时许可.

编辑：LogCat

FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example/com.example.UploadActivity}: java.lang.SecurityException: Permission Denial: reading com.android.providers.downloads.DownloadProvider uri content://downloads/all_downloads/1145 from pid=16585,uid=10086 requires android.permission.ACCESS_ALL_DOWNLOADS,or grantUriPermission()
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
    at android.app.ActivityThread.access$600(ActivityThread.java:141)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:5041)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.downloads.DownloadProvider uri content://downloads/all_downloads/1145 from pid=16585,or grantUriPermission()
    at android.os.Parcel.readException(Parcel.java:1425)
    at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:185)
    at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)
    at android.content.ContentProviderProxy.query(ContentProviderNative.java:366)
    at android.content.ContentResolver.query(ContentResolver.java:372)
    at android.content.ContentResolver.query(ContentResolver.java:315)
    at com.example.UploadActivity.getFileFromContentUri(UploadActivity.java:304)
    at com.example.UploadActivity.onCreate(UploadActivity.java:195)
    at android.app.Activity.performCreate(Activity.java:5104)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
    ... 11 more

解决方法

请发布完整的代码以查询ContentProvider.我有类似的问题.
用以下方法调用游标时：

c=MyApplication.getAppContext().getContentResolver().query(uri,null,null);

但是当我将投影设置为

String[] proj=new String[] {
                MediaStore.MediaColumns.DATA,MediaStore.MediaColumns.DISPLAY_NAME,}; 
c=MyApplication.getAppContext().getContentResolver().query(uri,proj,null);

有用.只要我将MediaStore.MediaColumns.MIME_TYPE添加到投影中,它就会再次失败.在我看来,提供程序不授予访问此(可能还有其他一些)列的权限.