MessageFileViewFragment.java revision 61eec98d398358f61cf601e805e8bfd01e4b3418 
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
17package com.android.email.activity;
18
19import com.android.email.R;
20import com.android.email.Utility;
21import com.android.email.provider.EmailContent.Message;
22
23import android.app.Activity;
24import android.net.Uri;
25import android.os.Bundle;
26import android.view.LayoutInflater;
27import android.view.View;
28import android.view.ViewGroup;
29
30import java.security.InvalidParameterException;
31
32/**
33 * A {@link MessageViewFragmentBase} subclass for file based messages. (aka EML files)
34 *
35 * See {@link MessageViewBase} for the class relation diagram.
36 */
37public class MessageFileViewFragment extends MessageViewFragmentBase {
38    private Uri mFileEmailUri;
39    /**
40     * # of instances of this class.  When it gets 0, and the last one is not destroying for
41     * a config change, we delete all the EML files.
42     */
43    private static int sFragmentCount;
44
45    @Override
46    public void onCreate(Bundle savedInstanceState) {
47        super.onCreate(savedInstanceState);
48        sFragmentCount++;
49    }
50
51    /**
52     * Loads the layout.
53     *
54     * This class uses the same layout as {@link MessageViewFragment}, but hides the star.
55     */
56    @Override
57    public View onCreateView(
58            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
59        View view = super.onCreateView(inflater, container, savedInstanceState);
60
61        view.findViewById(R.id.favorite).setVisibility(View.GONE);
62        return view;
63    }
64
65    @Override
66    public void onDestroy() {
67        super.onDestroy();
68
69        // If this is the last fragment of its kind, delete any/all attachment messages
70        sFragmentCount--;
71        if ((sFragmentCount == 0) && !getActivity().isChangingConfigurations()) {
72            getController().deleteAttachmentMessages();
73        }
74    }
75
76    /** Called by activities with a URI to an EML file. */
77    public void openMessage(Uri fileEmailUri) {
78        if (fileEmailUri == null) {
79            throw new InvalidParameterException();
80        }
81        mFileEmailUri = fileEmailUri;
82        openMessageIfStarted();
83    }
84
85    @Override
86    public void clearContent() {
87        super.clearContent();
88        mFileEmailUri = null;
89    }
90
91    @Override
92    protected boolean isMessageSpecified() {
93        return mFileEmailUri != null;
94    }
95
96    @Override
97    protected Message openMessageSync() {
98        final Activity activity = getActivity();
99        // Put up a toast; this can take a little while...
100        Utility.showToast(activity, R.string.message_view_parse_message_toast);
101        Message msg = getController().loadMessageFromUri(mFileEmailUri);
102        if (msg == null) {
103            // Indicate that the attachment couldn't be loaded
104            Utility.showToast(activity, R.string.message_view_display_attachment_toast);
105            return null;
106        }
107        return msg;
108    }
109
110    /**
111     * {@inheritDoc}
112     *
113     * Does exactly same as the super class method, but does an extra sanity check.
114     */
115    @Override
116    protected void reloadUiFromMessage(Message message, boolean okToFetch) {
117        // EML file should never be partially loaded.
118        if (message.mFlagLoaded != Message.FLAG_LOADED_COMPLETE) {
119            throw new IllegalStateException();
120        }
121        super.reloadUiFromMessage(message, okToFetch);
122    }
123}
124