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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 package com.android.messaging.ui.mediapicker;
     17 
     18 import android.app.Activity;
     19 import android.app.Fragment;
     20 import android.content.Intent;
     21 import android.net.Uri;
     22 import android.os.Bundle;
     23 
     24 import com.android.messaging.Factory;
     25 import com.android.messaging.datamodel.data.PendingAttachmentData;
     26 import com.android.messaging.ui.UIIntents;
     27 import com.android.messaging.util.ImageUtils;
     28 import com.android.messaging.util.SafeAsyncTask;
     29 
     30 /**
     31  * Wraps around the functionalities to allow the user to pick images from the document
     32  * picker.  Instances of this class must be tied to a Fragment which is able to delegate activity
     33  * result callbacks.
     34  */
     35 public class DocumentImagePicker {
     36 
     37     /**
     38      * An interface for a listener that listens for when a document has been picked.
     39      */
     40     public interface SelectionListener {
     41         /**
     42          * Called when an document is selected from picker. At this point, the file hasn't been
     43          * actually loaded and staged in the temp directory, so we are passing in a pending
     44          * MessagePartData, which the consumer should use to display a placeholder image.
     45          * @param pendingItem a temporary attachment data for showing the placeholder state.
     46          */
     47         void onDocumentSelected(PendingAttachmentData pendingItem);
     48     }
     49 
     50     // The owning fragment.
     51     private final Fragment mFragment;
     52 
     53     // The listener on the picker events.
     54     private final SelectionListener mListener;
     55 
     56     private static final String EXTRA_PHOTO_URL = "photo_url";
     57 
     58     /**
     59      * Creates a new instance of DocumentImagePicker.
     60      * @param activity The activity that owns the picker, or the activity that hosts the owning
     61      *        fragment.
     62      */
     63     public DocumentImagePicker(final Fragment fragment,
     64             final SelectionListener listener) {
     65         mFragment = fragment;
     66         mListener = listener;
     67     }
     68 
     69     /**
     70      * Intent out to open an image/video from document picker.
     71      */
     72     public void launchPicker() {
     73         UIIntents.get().launchDocumentImagePicker(mFragment);
     74     }
     75 
     76     /**
     77      * Must be called from the fragment/activity's onActivityResult().
     78      */
     79     public void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
     80         if (requestCode == UIIntents.REQUEST_PICK_IMAGE_FROM_DOCUMENT_PICKER &&
     81                 resultCode == Activity.RESULT_OK) {
     82             // Sometimes called after media item has been picked from the document picker.
     83             String url = data.getStringExtra(EXTRA_PHOTO_URL);
     84             if (url == null) {
     85                 // we're using the builtin photo picker which supplies the return
     86                 // url as it's "data"
     87                 url = data.getDataString();
     88                 if (url == null) {
     89                     final Bundle extras = data.getExtras();
     90                     if (extras != null) {
     91                         final Uri uri = (Uri) extras.getParcelable(Intent.EXTRA_STREAM);
     92                         if (uri != null) {
     93                             url = uri.toString();
     94                         }
     95                     }
     96                 }
     97             }
     98 
     99             // Guard against null uri cases for when the activity returns a null/invalid intent.
    100             if (url != null) {
    101                 final Uri uri = Uri.parse(url);
    102                 prepareDocumentForAttachment(uri);
    103             }
    104         }
    105     }
    106 
    107     private void prepareDocumentForAttachment(final Uri documentUri) {
    108         // Notify our listener with a PendingAttachmentData containing the metadata.
    109         // Asynchronously get the content type for the picked image since
    110         // ImageUtils.getContentType() potentially involves I/O and can be expensive.
    111         new SafeAsyncTask<Void, Void, String>() {
    112             @Override
    113             protected String doInBackgroundTimed(final Void... params) {
    114                 return ImageUtils.getContentType(
    115                         Factory.get().getApplicationContext().getContentResolver(), documentUri);
    116             }
    117 
    118             @Override
    119             protected void onPostExecute(final String contentType) {
    120                 // Ask the listener to create a temporary placeholder item to show the progress.
    121                 final PendingAttachmentData pendingItem =
    122                         PendingAttachmentData.createPendingAttachmentData(contentType,
    123                                 documentUri);
    124                 mListener.onDocumentSelected(pendingItem);
    125             }
    126         }.executeOnThreadPool();
    127     }
    128 }
    129