从照片棒棒糖Android中打开图像

Question

我正在尝试打开图像以在我的应用中显示。这最初适用于具有以下代码的任何本地文件：

...
if ("content".equalsIgnoreCase(uri.getScheme())) {
        return getDataColumn(context, uri, null, null);
...

public static String getDataColumn(Context context, Uri uri, String selection,
                                   String[] selectionArgs) {
    Cursor cursor = null;
    final String column = "_data";
    final String[] projection = {
            column
    };
    try {
        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                null);
        if (cursor != null && cursor.moveToFirst()) {
            final int column_index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(column_index);
        }
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return null;
}

但是，当我使用棒棒糖从上传的照片库中打开图像时，图像似乎已下载，但“_data”返回 null，因此我无法在我的应用中找到要打开的本地地址。

我的问题：如何打开从照片库下载的图像？

我已经阅读了很多关于 isMediaDocument 和 isDownloadedDocument 的内容，但都为图片返回 false。

Answer 1

import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.ParcelFileDescriptor;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.util.Log;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
* Created by HP-HP on 09-08-2015.
*/
public class ImagePathUtils {

/**
 * Get a file path from a Uri. This will get the the path for Storage Access
 * Framework Documents, as well as the _data field for the MediaStore and
 * other file-based ContentProviders.
 *
 * @param context The context.
 * @param uri The Uri to query.
 * @author paulburke
 */

@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {

    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;


    // Google Drive Uri
    if(isGoogleDriveUri(uri))
    {
        ParcelFileDescriptor parcelFileDescriptor;
        try {
            parcelFileDescriptor = context.getContentResolver().openFileDescriptor(uri, "r");
            FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();

            BitmapFactory.Options bmOptions = new BitmapFactory.Options();
            bmOptions.inJustDecodeBounds = true;
            bmOptions.inSampleSize = 1;
            bmOptions.inJustDecodeBounds = false;
            bmOptions.inDither = false;
            bmOptions.inPurgeable = true;
            bmOptions.inInputShareable = true;

            Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor,null,bmOptions);
            parcelFileDescriptor.close();
            return storeGoogleDriveImage(context,image).getPath();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    // DocumentProvider
    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
        // ExternalStorageProvider
        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            }

            // TODO handle non-primary volumes
        }
        // DownloadsProvider
        else if (isDownloadsDocument(uri)) {
            final String id = DocumentsContract.getDocumentId(uri);
            final Uri contentUri = ContentUris.withAppendedId(
                    Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

            return getDataColumn(context, contentUri, null, null);
        }
        // MediaProvider
        else if (isMediaDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            Uri contentUri = null;
            if ("image".equals(type)) {
                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            } else if ("video".equals(type)) {
                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            } else if ("audio".equals(type)) {
                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            }

            final String selection = "_id=?";
            final String[] selectionArgs = new String[] {
                    split[1]
            };

            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
    }
    // MediaStore (and general)
    else if ("content".equalsIgnoreCase(uri.getScheme())) {
        // Return the remote address
        if (isGooglePhotosUri(uri))
            return uri.getLastPathSegment();

        return getDataColumn(context, uri, null, null);
    }
    // File
    else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }

    return null;
}

/**
 * Get the value of the data column for this Uri. This is useful for
 * MediaStore Uris, and other file-based ContentProviders.
 *
 * @param context The context.
 * @param uri The Uri to query.
 * @param selection (Optional) Filter used in the query.
 * @param selectionArgs (Optional) Selection arguments used in the query.
 * @return The value of the _data column, which is typically a file path.
 */
public static String getDataColumn(Context context, Uri uri, String selection,
                                   String[] selectionArgs) {

    Cursor cursor = null;
    final String column = "_data";
    final String[] projection = {MediaStore.Images.Media.DATA};

    try {
        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                null);
        if (cursor != null && cursor.moveToFirst()) {
            final int index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(index);
        }
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return null;
}

public static Uri storeGoogleDriveImage(Context context, Bitmap bitmap)
{
    File pictureFile = ImageUtils.getOutputMediaFile(context,"share");
    if (pictureFile == null) {
        Log.d("","Error creating media file, check storage permissions: ");// e.getMessage());
    }
    try {
        FileOutputStream fos = new FileOutputStream(pictureFile);
        bitmap.compress(Bitmap.CompressFormat.PNG, 80, fos);
        fos.flush();
        fos.close();

    } catch (FileNotFoundException e) {
        Log.d("", "File not found: " + e.getMessage());
    } catch (IOException e) {
        Log.d("", "Error accessing file: " + e.getMessage());
    }

    return Uri.parse("file://" + pictureFile.getAbsolutePath());
}


/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is ExternalStorageProvider.
 */
public static boolean isExternalStorageDocument(Uri uri) {
    return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is DownloadsProvider.
 */
public static boolean isDownloadsDocument(Uri uri) {
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is MediaProvider.
 */
public static boolean isMediaDocument(Uri uri) {
    return "com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is Google Photos.
 */
public static boolean isGooglePhotosUri(Uri uri) {
    return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is GoogleDrive.
 */
public static boolean isGoogleDriveUri(Uri uri) {
    //com.google.android.apps.docs.storage.legacy from google drive share to bakar
    //com.google.android.apps.docs.storage from bakar  publish activity to google drive
    return "com.google.android.apps.docs.storage.legacy".equals(uri.getAuthority()) || "com.google.android.apps.docs.storage".equals(uri.getAuthority());
}

}

Answer 2

如何打开从照片库下载的图像？

这取决于“打开图像”的含义。

如果您的目标是在 ImageView 或类似的小部件中显示图像，请使用任何可用的 image loading libraries for Android，例如 Picasso 或 Universal Image Loader。他们将在后台线程、缓存等方面为您处理这项工作。

如果您需要更直接地处理图像，请在您的ContentResolver 上使用openInputStream()，将Uri 传递给图像，以获得InputStream。

Answer 3

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

}

如果它不起作用。我想你打开 google+ 驱动器照片库而不是手机存储库。我过去使用棒棒糖有同样的问题。我改变了调用画廊的意图，它起作用了