ContentResolver操作uri权限问题

在Android中使用ContentResolver通过uri代开输入流&＃xff1a;

ContentResolver contentResolver &＃61; getContentResolver();
InputStream inputStream &＃61; contentResolver.openInputStream(uri);


报了以下错误&＃xff1a;

java.lang.SecurityException: Permission Denial: reading com.android.externalstorage.ExternalStorageProvider uri content://com.android.externalstorage.documents/document/primary%3ADownload%2Fxxx from pid&＃61;15575, uid&＃61;10079 requires android.permission.MANAGE_DOCUMENTS, or grantUriPermission()

或报

Caused by: java.lang.SecurityException: UID 10173 does not have permission to content://com.android.fileexplorer.myprovider/external_files/Android/data/com.tencent.mobileqq/Tencent/QQfile_recv/6.%E5%B9%BF%E5%B7%.pdf [user 0]

查看官方文档&＃xff1a;

当接收uri的activity销毁之后&＃xff0c;这个uri也就失去权限&＃xff0c;它是跟随接收它的activity生命周期的&＃xff0c;那么我们只需要在接收的activity销毁之前&＃xff0c;将权限传递给其他的activity即可&＃xff1a;

Intent intent &＃61; new Intent(MainActivity.this, BActivity.class);
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setDataAndType(uri,Intent.ACTION_OPEN_DOCUMENT);
intent.setType(Intent.ACTION_CREATE_DOCUMENT);
startActivity(intent);


注意&＃xff1a;

1. activity只能逐级传递权限&＃xff0c;比如你的跳转流程是a-》b-》c&＃xff0c;需要每次跳转都使用上面的方法。
2. 在跳转过程中确保在其他地方intent的flags没被修改&＃xff0c;比如在前面做了intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)&＃xff0c;后面的步骤中可能需要用到其他的flags&＃xff0c;务必要使用addFlags而不能用setFlags&＃xff0c;因为setFlags会把前面设置的给覆盖掉&＃xff01;

以上是一个URI传递权限的情况&＃xff0c;那如果是一个URI集合呢&＃xff0c;要怎么传递&＃xff0c;比如&＃xff1a;

List<Uri> uris &＃61; intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);


要想把uris的权限传递到下一个activity&＃xff0c;也比较简单&＃xff0c;只需要这么做&＃xff1a;

Intent intent &＃61; new Intent(MainActivity.this, BActivity.class);
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setAction(Intent.ACTION_SEND_MULTIPLE);
intent.setType(Intent.ACTION_CREATE_DOCUMENT);
intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
startActivity(intent);


注意&＃xff1a;如果少了intent.setAction(Intent.ACTION_SEND_MULTIPLE)&＃xff0c;则报错&＃xff1a;java.lang.SecurityException: Permission Denial: reading com.android.externalstorage.ExternalStorageProvider uri content://com.android.externalstorage.documents/document/primary%3ADownload%2Fxxx from pid&＃61;15575, uid&＃61;10079 requires android.permission.MANAGE_DOCUMENTS, or grantUriPermission()