MessageFileViewFragment.java revision deda053f7c78755f7ce9a87ae5d7df3355e95cd7
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 /** 39 * URI of message to open. Protect with {@link #mLock}. 40 */ 41 private Uri mFileEmailUri; 42 43 /** Lock object to protect {@link #mFileEmailUri} */ 44 private final Object mLock = new Object(); 45 46 /** 47 * # of instances of this class. When it gets 0, and the last one is not destroying for 48 * a config change, we delete all the EML files. 49 */ 50 private static int sFragmentCount; 51 52 @Override 53 public void onCreate(Bundle savedInstanceState) { 54 super.onCreate(savedInstanceState); 55 sFragmentCount++; 56 } 57 58 /** 59 * Loads the layout. 60 * 61 * This class uses the same layout as {@link MessageViewFragment}, but hides the star. 62 */ 63 @Override 64 public View onCreateView( 65 LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 66 View view = super.onCreateView(inflater, container, savedInstanceState); 67 68 view.findViewById(R.id.favorite).setVisibility(View.GONE); 69 return view; 70 } 71 72 @Override 73 public void onDestroy() { 74 super.onDestroy(); 75 76 // If this is the last fragment of its kind, delete any/all attachment messages 77 sFragmentCount--; 78 if ((sFragmentCount == 0) && !getActivity().isChangingConfigurations()) { 79 getController().deleteAttachmentMessages(); 80 } 81 } 82 83 /** Called by activities with a URI to an EML file. */ 84 public void openMessage(Uri fileEmailUri) { 85 if (fileEmailUri == null) { 86 throw new InvalidParameterException(); 87 } 88 synchronized (mLock) { 89 mFileEmailUri = fileEmailUri; 90 } 91 loadMessageIfResumed(); 92 } 93 94 @Override 95 public void clearContent() { 96 synchronized (mLock) { 97 super.clearContent(); 98 mFileEmailUri = null; 99 } 100 } 101 102 @Override 103 protected boolean isMessageSpecified() { 104 synchronized (mLock) { 105 return mFileEmailUri != null; 106 } 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 synchronized (mLock) { 115 Uri messageUri = mFileEmailUri; 116 if (messageUri == null) { 117 return null; // Called after clearContent(). 118 } 119 // Put up a toast; this can take a little while... 120 Utility.showToast(activity, R.string.message_view_parse_message_toast); 121 Message msg = getController().loadMessageFromUri(messageUri); 122 if (msg == null) { 123 // Indicate that the attachment couldn't be loaded 124 Utility.showToast(activity, R.string.message_view_display_attachment_toast); 125 return null; 126 } 127 return msg; 128 } 129 } 130 131 /** 132 * {@inheritDoc} 133 * 134 * Does exactly same as the super class method, but does an extra sanity check. 135 */ 136 @Override 137 protected void reloadUiFromMessage(Message message, boolean okToFetch) { 138 // EML file should never be partially loaded. 139 if (message.mFlagLoaded != Message.FLAG_LOADED_COMPLETE) { 140 throw new IllegalStateException(); 141 } 142 super.reloadUiFromMessage(message, okToFetch); 143 } 144} 145