我如何从库中检索图像的Picasa ID / URL [英] How do I retrieve the Picasa id/URL of an image from the gallery

问题描述

我有获取从设备的画廊图像，并上传到服务的活动。现在，优化的目的，我想避免上传是在Picasa中只存储它们的ID或URL供以后检索图像。

I have an activity that retrieves images from the device's gallery and uploads to a service. Now, for optimisation purposes, I would like to avoid uploading images that are on Picasa an just store their ID or URL for later retrieval.

所以我的问题是，我怎么检索该信息。我的意图code粘贴下面并检索图像的URI。

So my question is, how do I retrieve that information. My intent code is pasted below and retrieves the URI of the image.

Intent galleryIntent = new Intent();
galleryIntent.setType("image/*");
galleryIntent.setAction(Intent.ACTION_PICK);
startActivityForResult(galleryIntent, GALLERY_PIC_REQUEST);

我试着去找PICASA_ID（MediaStore.Images.Media.PICASA_ID），但通过使用上述方法，则返回null。任何想法？

I tried to look for the PICASA_ID (MediaStore.Images.Media.PICASA_ID), but by using the method above, it returns null. Any ideas?

推荐答案

• 启动一个 ACTION_GET_CONTENT 的意图，而不是一个 ACTION_PICK

提供一个 MediaStore.EXTRA_OUTPUT 额外与 URI 到一个临时文件。

Provide a MediaStore.EXTRA_OUTPUT extra with an URI to a temporary file.

添加到您的的调用活动的

Add this to your calling activity:

File yourFile;

现在使用的的 code获得意图的

Now use this code to get Intent:

yourFile = getFileStreamPath("yourTempFile");
yourFile.getParentFile().mkdirs();
Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT, null);
galleryIntent .setType("image/*");
galleryIntent .putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(yourFile));
galleryIntent.putExtra("outputFormat", Bitmap.CompressFormat.PNG.name());
startActivityForResult(galleryIntent, GALLERY_PIC_REQUEST);

确保 yourFile 创建

另外，在您的的调用活动的

Also in your calling activity

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch(requestCode){
    case GALLERY_PIC_REQUEST:
        File file = null;
        Uri imageUri = data.getData();
        if (imageUri == null || imageUri.toString().length() == 0) {
            imageUri = Uri.fromFile(mTempFile);
            file = mTempFile;
            //this is the file you need! Check it
        }
        //if the file did not work we try alternative method
        if (file == null) {
            if (requestCode == 101 && data != null) {
                Uri selectedImageUri = data.getData();
                String selectedImagePath = getPath(selectedImageUri);
                //check this string to extract picasa id
            }
        }
    break;
    }
}

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    if(cursor!=null)
    {
        int index = cursor
        .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(index);
    }
    else return null;
}

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