1 /*
2  * Copyright (C) 2007 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 android.widget.focus;
18 
19 import android.app.Activity;
20 import android.graphics.Point;
21 import android.os.Bundle;
22 import android.view.View;
23 import android.view.ViewGroup;
24 import android.widget.BaseAdapter;
25 import android.widget.ListView;
26 import android.util.InternalSelectionView;
27 
28 /**
29  * A list of {@link InternalSelectionView}s paramatarized by the number of items,
30  * how many rows in each item, and how tall each item is.
31  */
32 public class ListOfInternalSelectionViews extends Activity {
33 
34     private ListView mListView;
35 
36 
37     // keys for initializing via Intent params
38     public static final String BUNDLE_PARAM_NUM_ITEMS = "com.google.test.numItems";
39     public static final String BUNDLE_PARAM_NUM_ROWS_PER_ITEM = "com.google.test.numRowsPerItem";
40     public static final String BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR = "com.google.test.itemScreenHeightFactor";
41 
42     private int mScreenHeight;
43 
44     private int mNumItems = 5;
45     private int mNumRowsPerItem = 4;
46     private double mItemScreenSizeFactor = 5 / 4;
47 
getListView()48     public ListView getListView() {
49         return mListView;
50     }
51 
52     /**
53      * Each item is screen height * this factor tall.
54      */
getItemScreenSizeFactor()55     public double getItemScreenSizeFactor() {
56         return mItemScreenSizeFactor;
57     }
58 
59     /**
60      * @return The number of rows per item.
61      */
getNumRowsPerItem()62     public int getNumRowsPerItem() {
63         return mNumRowsPerItem;
64     }
65 
66     /**
67      * @return The number of items in the list.
68      */
getNumItems()69     public int getNumItems() {
70         return mNumItems;
71     }
72 
73     /**
74      * @param position The position
75      * @return The label (closest thing to a value) for the item at position
76      */
getLabelForPosition(int position)77     public String getLabelForPosition(int position) {
78         return "position " + position;
79     }
80 
81     /**
82      * Get the currently selected view.
83      */
getSelectedView()84     public InternalSelectionView getSelectedView() {
85         return (InternalSelectionView) getListView().getSelectedView();
86     }
87 
88     /**
89      * Get the screen height.
90      */
getScreenHeight()91     public int getScreenHeight() {
92         return mScreenHeight;
93     }
94 
95     /**
96      * Initialize a bundle suitable for sending as the params of the intent that
97      * launches this activity.
98      * @param numItems The number of items in the list.
99      * @param numRowsPerItem The number of rows per item.
100      * @param itemScreenHeightFactor see {@link #getScreenHeight()}
101      * @return the intialized bundle.
102      */
getBundleFor(int numItems, int numRowsPerItem, double itemScreenHeightFactor)103     public static Bundle getBundleFor(int numItems, int numRowsPerItem, double itemScreenHeightFactor) {
104         Bundle bundle = new Bundle();
105         bundle.putInt(BUNDLE_PARAM_NUM_ITEMS, numItems);
106         bundle.putInt(BUNDLE_PARAM_NUM_ROWS_PER_ITEM, numRowsPerItem);
107         bundle.putDouble(BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR, itemScreenHeightFactor);
108         return bundle;
109     }
110 
111     @Override
onCreate(Bundle icicle)112     protected void onCreate(Bundle icicle) {
113         super.onCreate(icicle);
114 
115         Point size = new Point();
116         getWindowManager().getDefaultDisplay().getSize(size);
117         mScreenHeight = size.y;
118 
119         Bundle extras = getIntent().getExtras();
120         if (extras != null) {
121             initFromBundle(extras);
122         }
123 
124         mListView = new ListView(this);
125         mListView.setLayoutParams(new ViewGroup.LayoutParams(
126                 ViewGroup.LayoutParams.MATCH_PARENT,
127                 ViewGroup.LayoutParams.MATCH_PARENT));
128         mListView.setDrawSelectorOnTop(false);
129         mListView.setAdapter(new MyAdapter());
130         mListView.setItemsCanFocus(true);
131         setContentView(mListView);
132     }
133 
initFromBundle(Bundle icicle)134     private void initFromBundle(Bundle icicle) {
135 
136         int numItems = icicle.getInt(BUNDLE_PARAM_NUM_ITEMS, -1);
137         if (numItems != -1) {
138             mNumItems = numItems;
139         }
140         int numRowsPerItem = icicle.getInt(BUNDLE_PARAM_NUM_ROWS_PER_ITEM, -1);
141         if (numRowsPerItem != -1) {
142             mNumRowsPerItem = numRowsPerItem;
143         }
144         double screenHeightFactor = icicle.getDouble(BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR, -1.0);
145         if (screenHeightFactor > 0) {
146             mItemScreenSizeFactor = screenHeightFactor;
147         }
148     }
149 
150     private class MyAdapter extends BaseAdapter {
151 
getCount()152         public int getCount() {
153             return mNumItems;
154         }
155 
getItem(int position)156         public Object getItem(int position) {
157             return getLabelForPosition(position);
158         }
159 
getItemId(int position)160         public long getItemId(int position) {
161             return position;
162         }
163 
getView(int position, View convertView, ViewGroup parent)164         public View getView(int position, View convertView, ViewGroup parent) {
165             InternalSelectionView item =
166                     new InternalSelectionView(
167                             parent.getContext(),
168                             mNumRowsPerItem,
169                             getLabelForPosition(position));
170             item.setDesiredHeight((int) (mScreenHeight * mItemScreenSizeFactor));
171             return item;
172         }
173     }
174 }
175