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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
      5  * use this file except in compliance with the License. You may obtain a copy of
      6  * 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, WITHOUT
     12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
     13  * License for the specific language governing permissions and limitations under
     14  * the License.
     15  */
     16 
     17 package com.example.android.apis.accessibility;
     18 
     19 import com.example.android.apis.R;
     20 
     21 import android.content.Context;
     22 import android.util.AttributeSet;
     23 import android.view.LayoutInflater;
     24 import android.view.View;
     25 import android.view.ViewGroup;
     26 import android.view.accessibility.AccessibilityEvent;
     27 import android.widget.BaseAdapter;
     28 import android.widget.CheckBox;
     29 import android.widget.ListView;
     30 import android.widget.TextView;
     31 
     32 
     33 /** Acts as a go-between for all AccessibilityEvents sent from items in the ListView, providing the
     34  *  option of sending more context to an AccessibilityService by adding more AccessiblityRecords to
     35  *  an event.
     36  */
     37 public class TaskListView extends ListView {
     38 
     39     public TaskListView(Context context, AttributeSet attributeSet) {
     40         super(context, attributeSet);
     41     }
     42 
     43     /**
     44      * This method will fire whenever a child event wants to send an AccessibilityEvent.  As a
     45      * result, it's a great place to add more AccessibilityRecords, if you want.  In this case,
     46      * the code is grabbing the position of the item in the list, and assuming that to be the
     47      * priority for the task.
     48      */
     49     @Override
     50     public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) {
     51         // Add a record for ourselves as well.
     52         AccessibilityEvent record = AccessibilityEvent.obtain();
     53         super.onInitializeAccessibilityEvent(record);
     54 
     55         int priority = (Integer) child.getTag();
     56         String priorityStr = "Priority: " + priority;
     57         record.setContentDescription(priorityStr);
     58 
     59         event.appendRecord(record);
     60         return true;
     61     }
     62 }
     63 
     64 /** Adds Accessibility information to individual child views of rows in the list. */
     65 final class TaskAdapter extends BaseAdapter{
     66 
     67     private String[] mLabels = null;
     68     private boolean[] mCheckboxes = null;
     69     private Context mContext = null;
     70 
     71     public TaskAdapter(Context context, String[] labels, boolean[] checkboxes) {
     72         super();
     73         mContext = context;
     74         mLabels = labels;
     75         mCheckboxes = checkboxes;
     76     }
     77 
     78     @Override
     79     public int getCount() {
     80         return mLabels.length;
     81     }
     82 
     83     /** Expands the views for individual list entries, and sets content descriptions for use by the
     84      *  TaskBackAccessibilityService.
     85      */
     86     @Override
     87     public View getView(int position, View convertView, ViewGroup parent) {
     88         if(convertView == null) {
     89             LayoutInflater inflater = LayoutInflater.from(mContext);
     90             convertView = inflater.inflate(R.layout.tasklist_row, parent, false);
     91         }
     92 
     93         CheckBox checkbox = (CheckBox) convertView.findViewById(R.id.tasklist_finished);
     94         checkbox.setChecked(mCheckboxes[position]);
     95 
     96         TextView label = (TextView)(convertView.findViewById(R.id.tasklist_label));
     97         label.setText(mLabels[position]);
     98 
     99         String contentDescription = new StringBuilder()
    100                 .append(mContext.getString(R.string.task_name))
    101                 .append(' ')
    102                 .append(mLabels[position]).toString();
    103         label.setContentDescription(contentDescription);
    104 
    105         convertView.setTag(position);
    106 
    107         return convertView;
    108     }
    109 
    110     @Override
    111     public Object getItem(int position) {
    112         return mLabels[position];
    113     }
    114 
    115     @Override
    116     public long getItemId(int position) {
    117         return position;
    118     }
    119 }
    120