解决android4.4以后 媒体库打开闪退的问题

Uri转换成路径问题

Android4.4之后和以前的Uri不同,用以下代码进行转换

package com.huayin.huiyan.util;

import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

public class UriUtils {

    /**        * 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.        */        @SuppressLint("NewApi")    public static String getPath(final Context context, final Uri uri) {           final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;            // 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 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 = {                    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());        }    

}