Home | History | Annotate | Download | only in managedprovisioning 
      1 /*
      2  * Copyright 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.managedprovisioning;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.graphics.Bitmap;
     22 import android.graphics.BitmapFactory;
     23 import android.graphics.drawable.BitmapDrawable;
     24 import android.graphics.drawable.Drawable;
     25 import android.net.Uri;
     26 import android.provider.MediaStore;
     27 import android.view.View;
     28 import android.widget.ImageView;
     29 
     30 import com.android.internal.annotations.VisibleForTesting;
     31 import com.android.managedprovisioning.ProvisionLogger;
     32 
     33 import java.io.InputStream;
     34 import java.io.IOException;
     35 import java.io.File;
     36 import java.io.FileOutputStream;
     37 import java.lang.Math;
     38 
     39 public class LogoUtils {
     40     public static void saveOrganisationLogo(Context context, Uri uri) {
     41         final File logoFile = getOrganisationLogoFile(context);
     42         try {
     43             final InputStream in = context.getContentResolver().openInputStream(uri);
     44             final FileOutputStream out = new FileOutputStream(logoFile);
     45             final byte buffer[] = new byte[1024];
     46             int bytesReadCount;
     47             while ((bytesReadCount = in.read(buffer)) != -1) {
     48                 out.write(buffer, 0, bytesReadCount);
     49             }
     50             out.close();
     51             ProvisionLogger.logi("Organisation logo from uri " + uri + " has been successfully"
     52                     + " copied to " + logoFile);
     53         } catch (IOException e) {
     54             ProvisionLogger.logi("Could not write organisation logo from " + uri + " to "
     55                     + logoFile, e);
     56             // If the file was only partly written, delete it.
     57             logoFile.delete();
     58         }
     59     }
     60 
     61     public static Drawable getOrganisationLogo(Context context) {
     62         final File logoFile = getOrganisationLogoFile(context);
     63         Bitmap bitmap = null;
     64         int maxWidth = (int) context.getResources().getDimension(R.dimen.max_logo_width);
     65         int maxHeight = (int) context.getResources().getDimension(R.dimen.max_logo_height);
     66         if (logoFile.exists()) {
     67             bitmap = getBitmapPartiallyResized(logoFile.getPath(), maxWidth, maxHeight);
     68             if (bitmap == null) {
     69                 ProvisionLogger.loge("Could not get organisation logo from " + logoFile);
     70             }
     71         }
     72         // If the app that started ManagedProvisioning didn't specify a logo or we couldn't get a
     73         // logo from the uri they specified, use the default logo.
     74         if (bitmap == null) {
     75             bitmap = BitmapFactory.decodeResource(context.getResources(),
     76                     R.drawable.briefcase_icon);
     77         }
     78         return new BitmapDrawable(context.getResources(),
     79                 resizeBitmap(bitmap, maxWidth, maxHeight));
     80     }
     81 
     82     /**
     83      * Decodes a bitmap from an input stream.
     84      * If the actual dimensions of the bitmap are larger than the desired ones, will try to return a
     85      * subsample.
     86      * The point of using this method is that the entire image may be too big to fit entirely in
     87      * memmory. Since we may not need the entire image anyway, it's better to only decode a
     88      * subsample when possible.
     89      */
     90     @VisibleForTesting
     91     static Bitmap getBitmapPartiallyResized(String filePath, int maxDesiredWidth,
     92             int maxDesiredHeight) {
     93         BitmapFactory.Options bounds = new BitmapFactory.Options();
     94         // Firstly, let's just get the dimensions of the image.
     95         bounds.inJustDecodeBounds = true;
     96         BitmapFactory.decodeFile(filePath, bounds);
     97         int streamWidth = bounds.outWidth;
     98         int streamHeight = bounds.outHeight;
     99         int ratio = Math.max(streamWidth / maxDesiredWidth, streamHeight / maxDesiredHeight);
    100         if (ratio > 1) {
    101             // Decodes a smaller bitmap. Note that this ratio will be rounded down to the nearest
    102             // power of 2. The decoded bitmap will not have the expected size, but we'll do another
    103             // round of scaling.
    104             bounds.inSampleSize = ratio;
    105         }
    106         bounds.inJustDecodeBounds = false;
    107         // Now, decode the actual bitmap
    108         return BitmapFactory.decodeFile(filePath, bounds);
    109     }
    110 
    111     /*
    112      * Returns a new Bitmap with the specified maximum width and height. Does scaling if
    113      * necessary. Keeps the ratio of the original image.
    114      */
    115     @VisibleForTesting
    116     static Bitmap resizeBitmap(Bitmap bitmap, int maxWidth, int maxHeight) {
    117         int width = bitmap.getWidth();
    118         int height = bitmap.getHeight();
    119         double ratio = Math.max((double) width / maxWidth, (double) height / maxHeight);
    120         // We don't scale up.
    121         if (ratio > 1) {
    122             width /= ratio;
    123             height /= ratio;
    124             bitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);
    125         }
    126         return bitmap;
    127     }
    128 
    129     public static void cleanUp(Context context) {
    130         getOrganisationLogoFile(context).delete();
    131     }
    132 
    133     private static File getOrganisationLogoFile(Context context) {
    134         return new File(context.getFilesDir() + File.separator + "organisation_logo");
    135     }
    136 }
    137