| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.apis.view; |
| |
| import android.app.Activity; |
| import android.os.Bundle; |
| import android.view.ViewGroup; |
| import android.widget.LinearLayout; |
| import android.widget.ScrollView; |
| |
| /** |
| * Demonstrates how a well behaved view with internal selection |
| * ({@link InternalSelectionView}) can cause its parent {@link android.widget.ScrollView} |
| * to scroll to keep the internally interesting rectangle on the screen. |
| * |
| * {@link InternalSelectionView} achieves this by calling {@link android.view.View#requestRectangleOnScreen} |
| * each time its internal selection changes. |
| * |
| * {@link android.widget.ScrollView}, in turn, implements {@link android.view.View#requestRectangleOnScreen} |
| * thereby acheiving the result. Note that {@link android.widget.ListView} also implements the |
| * method, so views that call {@link android.view.View#requestRectangleOnScreen} that are embedded |
| * within either {@link android.widget.ScrollView}s or {@link android.widget.ListView}s can |
| * expect to keep their internal interesting rectangle visible. |
| */ |
| public class InternalSelectionScroll extends Activity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| ScrollView sv = new ScrollView(this); |
| ViewGroup.LayoutParams svLp = new ScrollView.LayoutParams( |
| ViewGroup.LayoutParams.MATCH_PARENT, |
| ViewGroup.LayoutParams.WRAP_CONTENT); |
| |
| LinearLayout ll = new LinearLayout(this); |
| ll.setLayoutParams(svLp); |
| sv.addView(ll); |
| |
| InternalSelectionView isv = new InternalSelectionView(this, 10); |
| int screenHeight = getWindowManager().getDefaultDisplay().getHeight(); |
| LinearLayout.LayoutParams llLp = new LinearLayout.LayoutParams( |
| ViewGroup.LayoutParams.MATCH_PARENT, |
| 2 * screenHeight); // 2x screen height to ensure scrolling |
| isv.setLayoutParams(llLp); |
| ll.addView(isv); |
| |
| setContentView(sv); |
| } |
| } |