public class ImageUtil {public static Intent getGalleryIntent(Intent intent){/**19之后的系統相冊的圖片都存在于MediaStore數據庫中；19之前的系統相冊中可能包含不存在與數據庫中的圖片，所以如果是19之上的系統* 跳轉到19之前的系統相冊選擇了一張不存在與數據庫中的圖片，解析uri時就可能會出現null*/if (Build.VERSION.SDK_INT < 19) {intent.setAction(Intent.ACTION_GET_CONTENT);intent.setType("image/*");} else {intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");}return intent;}/*** 專為Android4.4設計的從Uri獲取文件絕對路徑，以前的方法已不好使* 可以用在 解析 uri 數據的地方（相冊回傳數據）*/@RequiresApi(api = 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;// DocumentProviderif (isKitKat && DocumentsContract.isDocumentUri(context, uri)){// ExternalStorageProviderif (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];}}// DownloadsProviderelse 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);}// MediaProviderelse 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 getDataColumn(context, uri, null, null);}// Fileelse 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 = {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;}/*** @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());} }

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