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 com.example.android.apis.view;
18 
19 import android.app.Activity;
20 import android.os.Bundle;
21 import android.view.ViewGroup;
22 import android.widget.LinearLayout;
23 
24 /**
25  * {@link android.view.View#requestFocus(int, android.graphics.Rect)}
26  * and
27  * {@link android.view.View#onFocusChanged(boolean, int, android.graphics.Rect)}
28  * work together to give a newly focused item a hint about the most interesting
29  * rectangle of the previously focused view.  The view taking focus can use this
30  * to set an internal selection more appropriate using this rect.
31  *
32  * This Activity excercises that behavior using three adjacent {@link InternalSelectionView}
33  * that report interesting rects when giving up focus, and use interesting rects
34  * when taking focus to best select the internal row to show as selected.
35  *
36  * Were {@link InternalSelectionView} not to override {@link android.view.View#getFocusedRect}, or
37  * {@link android.view.View#onFocusChanged(boolean, int, android.graphics.Rect)}, the focus would
38  * jump to some default internal selection (the top) and not allow for the smooth handoff.
39  */
40 public class InternalSelectionFocus extends Activity {
41 
42     @Override
onCreate(Bundle savedInstanceState)43     protected void onCreate(Bundle savedInstanceState) {
44         super.onCreate(savedInstanceState);
45 
46         final LinearLayout layout = new LinearLayout(this);
47         layout.setOrientation(LinearLayout.HORIZONTAL);
48         layout.setLayoutParams(new ViewGroup.LayoutParams(
49                 ViewGroup.LayoutParams.MATCH_PARENT,
50                 ViewGroup.LayoutParams.MATCH_PARENT));
51 
52         LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0,
53                 ViewGroup.LayoutParams.MATCH_PARENT, 1);
54 
55         final InternalSelectionView leftColumn = new InternalSelectionView(this, 5, "left column");
56         leftColumn.setLayoutParams(params);
57         leftColumn.setPadding(10, 10, 10, 10);
58         layout.addView(leftColumn);
59 
60         final InternalSelectionView middleColumn = new InternalSelectionView(this, 5, "middle column");
61         middleColumn.setLayoutParams(params);
62         middleColumn.setPadding(10, 10, 10, 10);
63         layout.addView(middleColumn);
64 
65         final InternalSelectionView rightColumn = new InternalSelectionView(this, 5, "right column");
66         rightColumn.setLayoutParams(params);
67         rightColumn.setPadding(10, 10, 10, 10);
68         layout.addView(rightColumn);
69 
70         setContentView(layout);
71     }
72 
73 
74 }
75