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      1 /*
      2  * Copyright (C) 2010 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.email.activity;
     18 
     19 import android.app.Activity;
     20 import android.net.Uri;
     21 import android.os.Bundle;
     22 import android.util.Log;
     23 import android.view.LayoutInflater;
     24 import android.view.View;
     25 import android.view.ViewGroup;
     26 
     27 import com.android.email.Email;
     28 import com.android.email.R;
     29 import com.android.emailcommon.Logging;
     30 import com.android.emailcommon.provider.EmailContent.Message;
     31 import com.android.emailcommon.utility.Utility;
     32 
     33 /**
     34  * A {@link MessageViewFragmentBase} subclass for file based messages. (aka EML files)
     35  */
     36 public class MessageFileViewFragment extends MessageViewFragmentBase {
     37     /**
     38      * URI of message to open.
     39      */
     40     private Uri mFileEmailUri;
     41 
     42     /**
     43      * # of instances of this class.  When it gets 0, and the last one is not destroying for
     44      * a config change, we delete all the EML files.
     45      */
     46     private static int sFragmentCount;
     47 
     48     @Override
     49     public void onCreate(Bundle savedInstanceState) {
     50         super.onCreate(savedInstanceState);
     51         sFragmentCount++;
     52     }
     53 
     54     @Override
     55     public View onCreateView(
     56             LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
     57         View result = super.onCreateView(inflater, container, savedInstanceState);
     58 
     59         // Actions are not available in this view.
     60         UiUtilities.setVisibilitySafe(result, R.id.favorite, View.GONE);
     61         UiUtilities.setVisibilitySafe(result, R.id.reply, View.GONE);
     62         UiUtilities.setVisibilitySafe(result, R.id.reply_all, View.GONE);
     63         UiUtilities.setVisibilitySafe(result, R.id.forward, View.GONE);
     64         UiUtilities.setVisibilitySafe(result, R.id.more, View.GONE);
     65 
     66         return result;
     67     }
     68 
     69 
     70     @Override
     71     public void onActivityCreated(Bundle savedInstanceState) {
     72         super.onActivityCreated(savedInstanceState);
     73         if (mFileEmailUri == null) { // sanity check.  setFileUri() must have been called.
     74             throw new IllegalStateException();
     75         }
     76     }
     77 
     78     @Override
     79     public void onDestroy() {
     80         super.onDestroy();
     81 
     82         // If this is the last fragment of its kind, delete any/all attachment messages
     83         sFragmentCount--;
     84         if ((sFragmentCount == 0) && !getActivity().isChangingConfigurations()) {
     85             getController().deleteAttachmentMessages();
     86         }
     87     }
     88 
     89     /**
     90      * Called by the host activity to set the URL to the EML file to open.
     91      * Must be called before {@link #onActivityCreated(Bundle)}.
     92      *
     93      * Note: We don't use the fragment transaction for this fragment, so we can't use
     94      * {@link #getArguments()} to pass arguments.
     95      */
     96     public void setFileUri(Uri fileEmailUri) {
     97         if (Logging.DEBUG_LIFECYCLE && Email.DEBUG) {
     98             Log.d(Logging.LOG_TAG, this + " openMessage");
     99         }
    100         if (mFileEmailUri != null) {
    101             throw new IllegalStateException();
    102         }
    103         if (fileEmailUri == null) {
    104             throw new IllegalArgumentException();
    105         }
    106         mFileEmailUri = fileEmailUri;
    107     }
    108 
    109     /**
    110      * NOTE See the comment on the super method.  It's called on a worker thread.
    111      */
    112     @Override
    113     protected Message openMessageSync(Activity activity) {
    114         if (Logging.DEBUG_LIFECYCLE && Email.DEBUG) {
    115             Log.d(Logging.LOG_TAG, this + " openMessageSync");
    116         }
    117         // Put up a toast; this can take a little while...
    118         Utility.showToast(activity, R.string.message_view_parse_message_toast);
    119         Message msg = getController().loadMessageFromUri(mFileEmailUri);
    120         if (msg == null) {
    121             // Indicate that the EML couldn't be loaded
    122             Utility.showToast(activity, R.string.message_view_display_attachment_toast);
    123             return null;
    124         }
    125         return msg;
    126     }
    127 
    128     @Override
    129     protected Message reloadMessageSync(Activity activity) {
    130         // EML files will never change, so just return the same copy.
    131         return getMessage();
    132     }
    133 
    134     /**
    135      * {@inheritDoc}
    136      *
    137      * Does exactly same as the super class method, but does an extra sanity check.
    138      */
    139     @Override
    140     protected void reloadUiFromMessage(Message message, boolean okToFetch) {
    141         // EML file should never be partially loaded.
    142         if (message.mFlagLoaded != Message.FLAG_LOADED_COMPLETE) {
    143             throw new IllegalStateException();
    144         }
    145         super.reloadUiFromMessage(message, okToFetch);
    146     }
    147 }
    148