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 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
