ListOfInternalSelectionViews.java revision 1d3165f10b12165f02b7015ac1a817c5f60e6399 
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
17package android.widget.focus;
18
19import android.app.Activity;
20import android.os.Bundle;
21import android.view.View;
22import android.view.ViewGroup;
23import android.widget.BaseAdapter;
24import android.widget.ListView;
25import android.util.InternalSelectionView;
26
27/**
28 * A list of {@link InternalSelectionView}s paramatarized by the number of items,
29 * how many rows in each item, and how tall each item is.
30 */
31public class ListOfInternalSelectionViews extends Activity {
32
33    private ListView mListView;
34
35
36    // keys for initializing via Intent params
37    public static final String BUNDLE_PARAM_NUM_ITEMS = "com.google.test.numItems";
38    public static final String BUNDLE_PARAM_NUM_ROWS_PER_ITEM = "com.google.test.numRowsPerItem";
39    public static final String BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR = "com.google.test.itemScreenHeightFactor";
40
41    private int mScreenHeight;
42
43    private int mNumItems = 5;
44    private int mNumRowsPerItem = 4;
45    private double mItemScreenSizeFactor = 5 / 4;
46
47    public ListView getListView() {
48        return mListView;
49    }
50
51    /**
52     * Each item is screen height * this factor tall.
53     */
54    public double getItemScreenSizeFactor() {
55        return mItemScreenSizeFactor;
56    }
57
58    /**
59     * @return The number of rows per item.
60     */
61    public int getNumRowsPerItem() {
62        return mNumRowsPerItem;
63    }
64
65    /**
66     * @return The number of items in the list.
67     */
68    public int getNumItems() {
69        return mNumItems;
70    }
71
72    /**
73     * @param position The position
74     * @return The label (closest thing to a value) for the item at position
75     */
76    public String getLabelForPosition(int position) {
77        return "position " + position;
78    }
79
80    /**
81     * Get the currently selected view.
82     */
83    public InternalSelectionView getSelectedView() {
84        return (InternalSelectionView) getListView().getSelectedView();
85    }
86
87    /**
88     * Get the screen height.
89     */
90    public int getScreenHeight() {
91        return mScreenHeight;
92    }
93
94    /**
95     * Initialize a bundle suitable for sending as the params of the intent that
96     * launches this activity.
97     * @param numItems The number of items in the list.
98     * @param numRowsPerItem The number of rows per item.
99     * @param itemScreenHeightFactor see {@link #getScreenHeight()}
100     * @return the intialized bundle.
101     */
102    public static Bundle getBundleFor(int numItems, int numRowsPerItem, double itemScreenHeightFactor) {
103        Bundle bundle = new Bundle();
104        bundle.putInt(BUNDLE_PARAM_NUM_ITEMS, numItems);
105        bundle.putInt(BUNDLE_PARAM_NUM_ROWS_PER_ITEM, numRowsPerItem);
106        bundle.putDouble(BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR, itemScreenHeightFactor);
107        return bundle;
108    }
109
110    @Override
111    protected void onCreate(Bundle icicle) {
112        super.onCreate(icicle);
113        mScreenHeight = getWindowManager().getDefaultDisplay().getHeight();
114
115        Bundle extras = getIntent().getExtras();
116        if (extras != null) {
117            initFromBundle(extras);
118        }
119
120        mListView = new ListView(this);
121        mListView.setLayoutParams(new ViewGroup.LayoutParams(
122                ViewGroup.LayoutParams.MATCH_PARENT,
123                ViewGroup.LayoutParams.MATCH_PARENT));
124        mListView.setDrawSelectorOnTop(false);
125        mListView.setAdapter(new MyAdapter());
126        mListView.setItemsCanFocus(true);
127        setContentView(mListView);
128    }
129
130    private void initFromBundle(Bundle icicle) {
131
132        int numItems = icicle.getInt(BUNDLE_PARAM_NUM_ITEMS, -1);
133        if (numItems != -1) {
134            mNumItems = numItems;
135        }
136        int numRowsPerItem = icicle.getInt(BUNDLE_PARAM_NUM_ROWS_PER_ITEM, -1);
137        if (numRowsPerItem != -1) {
138            mNumRowsPerItem = numRowsPerItem;
139        }
140        double screenHeightFactor = icicle.getDouble(BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR, -1.0);
141        if (screenHeightFactor > 0) {
142            mItemScreenSizeFactor = screenHeightFactor;
143        }
144    }
145
146    private class MyAdapter extends BaseAdapter {
147
148        public int getCount() {
149            return mNumItems;
150        }
151
152        public Object getItem(int position) {
153            return getLabelForPosition(position);
154        }
155
156        public long getItemId(int position) {
157            return position;
158        }
159
160        public View getView(int position, View convertView, ViewGroup parent) {
161            InternalSelectionView item =
162                    new InternalSelectionView(
163                            parent.getContext(),
164                            mNumRowsPerItem,
165                            getLabelForPosition(position));
166            item.setDesiredHeight((int) (mScreenHeight * mItemScreenSizeFactor));
167            return item;
168        }
169    }
170}
171