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      1 /*
      2  * Copyright (C) 2009 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.example.android.notepad;
     18 
     19 import com.example.android.notepad.NotePad;
     20 
     21 import android.app.Activity;
     22 import android.content.Intent;
     23 import android.content.Intent.ShortcutIconResource;
     24 import android.os.Bundle;
     25 import android.provider.LiveFolders;
     26 
     27 /**
     28  * This Activity creates a live folder Intent and
     29  * sends it back to HOME. From the data in the Intent, HOME creates a live folder and displays
     30  * its icon in the Home view.
     31  * When the user clicks the icon, Home uses the data it got from the Intent to retrieve information
     32  * from a content provider and display it in a View.
     33  *
     34  * The intent filter for this Activity is set to ACTION_CREATE_LIVE_FOLDER, which
     35  * HOME sends in response to a long press and selection of Live Folder.
     36  */
     37 public class NotesLiveFolder extends Activity {
     38 
     39     /**
     40      * All of the work is done in onCreate(). The Activity doesn't actually display a UI.
     41      * Instead, it sets up an Intent and returns it to its caller (the HOME activity).
     42      */
     43     @Override
     44     protected void onCreate(Bundle savedInstanceState) {
     45         super.onCreate(savedInstanceState);
     46 
     47         /*
     48          * Gets the incoming Intent and its action. If the incoming Intent was
     49          * ACTION_CREATE_LIVE_FOLDER, then create an outgoing Intent with the
     50          * necessary data and send back OK. Otherwise, send back CANCEL.
     51          */
     52         final Intent intent = getIntent();
     53         final String action = intent.getAction();
     54 
     55         if (LiveFolders.ACTION_CREATE_LIVE_FOLDER.equals(action)) {
     56 
     57             // Creates a new Intent.
     58             final Intent liveFolderIntent = new Intent();
     59 
     60             /*
     61              * The following statements put data into the outgoing Intent. Please see
     62              * {@link android.provider.LiveFolders for a detailed description of these
     63              * data values. From this data, HOME sets up a live folder.
     64              */
     65             // Sets the URI pattern for the content provider backing the folder.
     66             liveFolderIntent.setData(NotePad.Notes.LIVE_FOLDER_URI);
     67 
     68             // Adds the display name of the live folder as an Extra string.
     69             String foldername = getString(R.string.live_folder_name);
     70             liveFolderIntent.putExtra(LiveFolders.EXTRA_LIVE_FOLDER_NAME, foldername);
     71 
     72             // Adds the display icon of the live folder as an Extra resource.
     73             ShortcutIconResource foldericon =
     74                 Intent.ShortcutIconResource.fromContext(this, R.drawable.live_folder_notes);
     75             liveFolderIntent.putExtra(LiveFolders.EXTRA_LIVE_FOLDER_ICON, foldericon);
     76 
     77             // Add the display mode of the live folder as an integer. The specified
     78             // mode causes the live folder to display as a list.
     79             liveFolderIntent.putExtra(
     80                     LiveFolders.EXTRA_LIVE_FOLDER_DISPLAY_MODE,
     81                     LiveFolders.DISPLAY_MODE_LIST);
     82 
     83             /*
     84              * Adds a base action for items in the live folder list, as an Intent. When the
     85              * user clicks an individual note in the list, the live folder fires this Intent.
     86              *
     87              * Its action is ACTION_EDIT, so it triggers the Note Editor activity. Its
     88              * data is the URI pattern for a single note identified by its ID. The live folder
     89              * automatically adds the ID value of the selected item to the URI pattern.
     90              *
     91              * As a result, Note Editor is triggered and gets a single note to retrieve by ID.
     92              */
     93             Intent returnIntent
     94                     = new Intent(Intent.ACTION_EDIT, NotePad.Notes.CONTENT_ID_URI_PATTERN);
     95             liveFolderIntent.putExtra(LiveFolders.EXTRA_LIVE_FOLDER_BASE_INTENT, returnIntent);
     96 
     97             /* Creates an ActivityResult object to propagate back to HOME. Set its result indicator
     98              * to OK, and sets the returned Intent to the live folder Intent that was just
     99              * constructed.
    100              */
    101             setResult(RESULT_OK, liveFolderIntent);
    102 
    103         } else {
    104 
    105             // If the original action was not ACTION_CREATE_LIVE_FOLDER, creates an
    106             // ActivityResult with the indicator set to CANCELED, but do not return an Intent
    107             setResult(RESULT_CANCELED);
    108         }
    109 
    110         // Closes the Activity. The ActivityObject is propagated back to the caller.
    111         finish();
    112     }
    113 }
    114