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());    
    }    

}