java - 在我的项目中实现 ACTION_OPEN_DOCUMENT 时遇到问题

Question

我有 AddActivity，它可以让您从相机拍摄的照片或从图库中选择的图像中获取 URI。然后就可以去DetailsActivity查看图片了。在您重新启动设备之前，我现在可以正常工作。在您重新启动并尝试转到该图像的 DetailsActivity 后，这是错误:

Caused by: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.media.MediaDocumentsProvider from ProcessRecord{3a5e86d 2915:jeremy.com.wineofmine/u0a321} (pid=2915, uid=10321) requires that you obtain access using ACTION_OPEN_DOCUMENT or related APIs

我去了"Open Files Using Storage Access Framework" Android 开发页面并阅读 Persist Permissions 部分。不过，我在将它应用到我的项目时遇到了问题。

我认为我不明白的主要事情是您似乎需要调用一个 Intent (在我的例子中是在 DetailsActivity 中)，但我什至没有一个 Intent 。

这是让您选择图库图像的 Intent 。这是在 AddActivity 中:

Intent intentGallery = new Intent(Intent.ACTION_OPEN_DOCUMENT);
            intentGallery.addCategory(Intent.CATEGORY_OPENABLE);
            intentGallery.setType("image/*");
            intentGallery.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intentGallery.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
            startActivityForResult(intentGallery, SELECT_IMAGE);

在 DetailsActivity 中，这是它实际崩溃的地方:

imageURI = Uri.parse(cursor.getString(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_IMAGE)));

bitmap = null;
    try {
        //If the cursor does not have anything in the image column, set the image to null, with a height so the textviews look decent
        if (cursor.isNull(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_IMAGE))){
            mFullImage.setImageBitmap(null);
            mFullImage.setMaxHeight(300);
        }else{
            //remake the bitmap from the URI in the image column
      //********This next line is where the program crashes**********
            bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), imageURI);
            mFullImage.setImageBitmap(bitmap);

        }

我能否获得一些帮助来弄清楚如何将其应用到我的项目中？

Answer 1

如下处理权限结果覆盖 onRequestPermissionsResult

 @Override
 public void onRequestPermissionsResult (int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case General.REQUESTPERMISSION:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //reload my activity with permission granted or use the features that required the permission

            } else {
                Messenger.makeToast(getContext(), R.string.noPermissionMarshmallow);
            }
            break;
    }
}

并在您的 onActivityResult 方法中持久化权限实现，如下所示

@Override
public void onActivityResult (int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    //if ok user selected a file
    if (resultCode == RESULT_OK) {
        Uri sourceTreeUri = data.getData();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            getContext().getContentResolver().takePersistableUriPermission(sourceTreeUri, Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        }
    }
}