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   源码介绍

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该实例成功解决了 android 4.4 系统 选择照片后  截图失败问题，这是路径取值问题， 详细看代码吧

package com.xzw.utils;

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;
/**
 * 
 * @author XuZhiwei (xuzw13@gmail.com)
 * Create at 2012-8-17 上午10:14:40
 */
public class Tools {
	/**
	 * 检查是否存在SDCard
	 * @return
	 */
	public static boolean hasSdcard(){
		String state = Environment.getExternalStorageState();
		if(state.equals(Environment.MEDIA_MOUNTED)){
			return true;
		}else{
			return false;
		}
	}
	
	
	
	/**
	 * 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
	 */
	@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());
	}
	
	
	
}