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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.example.rscamera;
     18 
     19 import java.io.FileNotFoundException;
     20 import java.io.IOException;
     21 import java.io.OutputStream;
     22 
     23 import android.content.ContentResolver;
     24 import android.content.ContentUris;
     25 import android.content.ContentValues;
     26 import android.graphics.Bitmap;
     27 import android.graphics.Matrix;
     28 import android.net.Uri;
     29 import android.provider.MediaStore;
     30 import android.provider.MediaStore.Images;
     31 
     32 /**
     33  * Utility class to save images into android image database
     34  */
     35 public class MediaStoreSaver {
     36     public static interface StreamWriter {
     37         void write(OutputStream imageOut) throws IOException;
     38     }
     39 
     40     public static final String insertImage(ContentResolver contentResolver,
     41                                            Bitmap image,
     42                                            String title,
     43                                            String description) {
     44         final Bitmap source = image;
     45         StreamWriter streamWriter = new StreamWriter() {
     46             public void write(OutputStream imageOut) {
     47                 source.compress(Bitmap.CompressFormat.JPEG, 50, imageOut);
     48             }
     49         };
     50         return insertImage(contentResolver, streamWriter, title, description);
     51     }
     52 
     53 
     54     public static final String insertImage(ContentResolver cr,
     55                                            StreamWriter source,
     56                                            String title,
     57                                            String description) {
     58 
     59         ContentValues values = new ContentValues();
     60         values.put(Images.Media.TITLE, title);
     61         values.put(Images.Media.DISPLAY_NAME, title);
     62         values.put(Images.Media.DESCRIPTION, description);
     63         values.put(Images.Media.MIME_TYPE, "image/jpeg");
     64         // Add the date meta data to ensure the image is added at the front of the gallery
     65         values.put(Images.Media.DATE_ADDED, System.currentTimeMillis());
     66         values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis());
     67 
     68         Uri url = null;
     69         String stringUrl = null;    /* value to be returned */
     70 
     71         try {
     72             url = cr.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
     73 
     74             if (source != null) {
     75                 OutputStream imageOut = cr.openOutputStream(url);
     76                 try {
     77                     source.write(imageOut);
     78                 } finally {
     79                     imageOut.close();
     80                 }
     81 
     82                 long id = ContentUris.parseId(url);
     83                 // Wait until MINI_KIND thumbnail is generated.
     84                 Bitmap miniThumb = Images.Thumbnails.getThumbnail(cr, id, Images.Thumbnails.MINI_KIND, null);
     85                 // This is for backward compatibility.
     86                 storeThumbnail(cr, miniThumb, id, 50F, 50F, Images.Thumbnails.MICRO_KIND);
     87             } else {
     88                 cr.delete(url, null, null);
     89                 url = null;
     90             }
     91         } catch (Exception e) {
     92             if (url != null) {
     93                 cr.delete(url, null, null);
     94                 url = null;
     95             }
     96         }
     97 
     98         if (url != null) {
     99             stringUrl = url.toString();
    100         }
    101 
    102         return stringUrl;
    103     }
    104 
    105     /**
    106      * A copy of the Android internals StoreThumbnail method, it used with the insertImage to
    107      * populate the android.provider.MediaStore.Images.Media#insertImage with all the correct
    108      * meta data. The StoreThumbnail method is private so it must be duplicated here.
    109      *
    110      * @see android.provider.MediaStore.Images.Media (StoreThumbnail private method)
    111      */
    112     private static final Bitmap storeThumbnail(
    113             ContentResolver cr,
    114             Bitmap source,
    115             long id,
    116             float width,
    117             float height,
    118             int kind) {
    119 
    120         // create the matrix to scale it
    121         Matrix matrix = new Matrix();
    122 
    123         float scaleX = width / source.getWidth();
    124         float scaleY = height / source.getHeight();
    125 
    126         matrix.setScale(scaleX, scaleY);
    127 
    128         Bitmap thumb = Bitmap.createBitmap(source, 0, 0,
    129                 source.getWidth(),
    130                 source.getHeight(), matrix,
    131                 true
    132         );
    133 
    134         ContentValues values = new ContentValues(4);
    135         values.put(Images.Thumbnails.KIND, kind);
    136         values.put(Images.Thumbnails.IMAGE_ID, (int) id);
    137         values.put(Images.Thumbnails.HEIGHT, thumb.getHeight());
    138         values.put(Images.Thumbnails.WIDTH, thumb.getWidth());
    139 
    140         Uri url = cr.insert(Images.Thumbnails.EXTERNAL_CONTENT_URI, values);
    141 
    142         try {
    143             OutputStream thumbOut = cr.openOutputStream(url);
    144             thumb.compress(Bitmap.CompressFormat.JPEG, 100, thumbOut);
    145             thumbOut.close();
    146             return thumb;
    147         } catch (FileNotFoundException ex) {
    148             return null;
    149         } catch (IOException ex) {
    150             return null;
    151         }
    152     }
    153 
    154 
    155 }
    156