UriParser.java

package com.littleboss.smartnote;

import android.annotation.SuppressLint;
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.provider.DocumentsContract;
import android.provider.MediaStore;
import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

public class UriParser {

    /**
     * 获取小于api19时获取相册中图片真正的uri
     * 对于路径是：content://media/external/images/media/33517这种的，需要转成/storage/emulated/0/DCIM/Camera/IMG_20160807_133403.jpg路径，也是使用这种方法
     * @param context
     * @param uri
     * @return
     */
    private static String getFilePath_below19(Context context,Uri uri) {
        //这里开始的第二部分，获取图片的路径：低版本的是没问题的，但是sdk>19会获取不到
        Cursor cursor = null;
        String path = "";
        try {
            String[] proj = {MediaStore.Images.Media.DATA};
            //好像是android多媒体数据库的封装接口，具体的看Android文档
            cursor = context.getContentResolver().query(uri, proj, null, null, null);
            //获得用户选择的图片的索引值
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            //将光标移至开头 ，这个很重要，不小心很容易引起越界
            cursor.moveToFirst();
            //最后根据索引值获取图片路径   结果类似：/mnt/sdcard/DCIM/Camera/IMG_20151124_013332.jpg
            path = cursor.getString(column_index);
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return path;
    }
    /**
     * @param context 上下文对象
     * @param uri     当前相册照片的Uri
     * @return 解析后的Uri对应的String
     */
    @SuppressLint("NewApi")
    public static String getPath(final Context context, final Uri uri) {
        // FIXME: 2018/11/13 Added if condition for test
        if (uri != null) {
            final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
            String pathHead = "";
            // 1. DocumentProvider
            if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
                // 1.1 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 pathHead + Environment.getExternalStorageDirectory() + "/" + split[1];
                    }
                }
                // 1.2 DownloadsProvider
                else if (isDownloadsDocument(uri)) {
                    final String id = DocumentsContract.getDocumentId(uri);
                    return id.substring(4);
                }
                // 1.3 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 pathHead + getDataColumn(context, contentUri, selection, selectionArgs);
                }
            }
            // 2. MediaStore (and general)
            else if ("content".equalsIgnoreCase(uri.getScheme())) {
                if (isGooglePhotosUri(uri)) {//判断是否是google相册图片
                    return uri.getLastPathSegment();
                } else if (isGooglePlayPhotosUri(uri)) {//判断是否是Google相册图片
                    return getImageUrlWithAuthority(context, uri);
                } else {//其他类似于media这样的图片，和android4.4以下获取图片path方法类似
                    return getFilePath_below19(context, uri);
                }
            }
            // 3. 判断是否是文件形式 File
            else if ("file".equalsIgnoreCase(uri.getScheme())) {
                return pathHead + uri.getPath();
            }
        }
        return null;
    }
    /**
     * @param uri
     *         The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    private 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.
     */
    private 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.
     */
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
    /**
     *  判断是否是Google相册的图片，类似于content://com.google.android.apps.photos.content/...
     **/
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }

    /**
     *  判断是否是Google相册的图片，类似于content://com.google.android.apps.photos.contentprovider/0/1/mediakey:/local%3A821abd2f-9f8c-4931-bbe9-a975d1f5fabc/ORIGINAL/NONE/1075342619
     **/
    public static boolean isGooglePlayPhotosUri(Uri uri) {
        return "com.google.android.apps.photos.contentprovider".equals(uri.getAuthority());
    }
    /**
     * Google相册图片获取路径
     **/
    public static String getImageUrlWithAuthority(Context context, Uri uri) {
        InputStream is = null;
        if (uri.getAuthority() != null) {
            try {
                is = context.getContentResolver().openInputStream(uri);
                Bitmap bmp = BitmapFactory.decodeStream(is);
                return writeToTempImageAndGetPathUri(context, bmp).toString();
            } catch (FileNotFoundException e) {
                //e.printStackTrace();
                Log.i("err getImageUrl...() : ", e.toString());
            }finally {
                try {
                    if(is!=null)
                        is.close();
                }catch (IOException e){
                    //e.printStackTrace();
                    Log.i("err getImageUrl...() : ", e.toString());
                }
            }
        }
        return null;
    }
    /**
     * 将图片流读取出来保存到手机本地相册中
     **/
    public static Uri writeToTempImageAndGetPathUri(Context inContext, Bitmap inImage) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
        String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
        return Uri.parse(path);
    }

    /**
     * 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.
     */
    private 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;
    }
}