| /* |
| * Copyright (C) 2008 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 android.util; |
| |
| import com.google.android.collect.Lists; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.os.Bundle; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.Window; |
| import android.widget.Button; |
| import android.widget.LinearLayout; |
| import android.widget.ScrollView; |
| import android.widget.TextView; |
| |
| import java.util.List; |
| |
| /** |
| * Utility base class for creating scroll view scenarios, allowing you to add |
| * a series of different kinds of views arranged vertically, taking up a |
| * specified amount of the screen height. |
| */ |
| public abstract class ScrollViewScenario extends Activity { |
| |
| /** |
| * Holds content of scroll view |
| */ |
| private LinearLayout mLinearLayout; |
| |
| /** |
| * The actual scroll view |
| */ |
| private ScrollView mScrollView; |
| |
| |
| /** |
| * What we need of each view that the user wants: the view, and the ratio |
| * to the screen height for its desired height. |
| */ |
| private interface ViewFactory { |
| View create(final Context context); |
| |
| float getHeightRatio(); |
| } |
| |
| /** |
| * Partially implement ViewFactory given a height ratio. |
| */ |
| private static abstract class ViewFactoryBase implements ViewFactory { |
| |
| private float mHeightRatio; |
| |
| @SuppressWarnings({"UnusedDeclaration"}) |
| private ViewFactoryBase() {throw new UnsupportedOperationException("don't call this!");} |
| |
| protected ViewFactoryBase(float heightRatio) { |
| mHeightRatio = heightRatio; |
| } |
| |
| public float getHeightRatio() { |
| return mHeightRatio; |
| } |
| } |
| |
| /** |
| * Builder for selecting the views to be vertically arranged in the scroll |
| * view. |
| */ |
| @SuppressWarnings({"JavaDoc"}) |
| public static class Params { |
| |
| List<ViewFactory> mViewFactories = Lists.newArrayList(); |
| |
| /** |
| * Add a text view. |
| * @param text The text of the text view. |
| * @param heightRatio The view's height will be this * the screen height. |
| */ |
| public Params addTextView(final String text, float heightRatio) { |
| mViewFactories.add(new ViewFactoryBase(heightRatio) { |
| public View create(final Context context) { |
| final TextView tv = new TextView(context); |
| tv.setText(text); |
| return tv; |
| } |
| }); |
| return this; |
| } |
| |
| /** |
| * Add multiple text views. |
| * @param numViews the number of views to add. |
| * @param textPrefix The text to prepend to each text view. |
| * @param heightRatio The view's height will be this * the screen height. |
| */ |
| public Params addTextViews(int numViews, String textPrefix, float heightRatio) { |
| for (int i = 0; i < numViews; i++) { |
| addTextView(textPrefix + i, heightRatio); |
| } |
| return this; |
| } |
| |
| /** |
| * Add a button. |
| * @param text The text of the button. |
| * @param heightRatio The view's height will be this * the screen height. |
| */ |
| public Params addButton(final String text, float heightRatio) { |
| mViewFactories.add(new ViewFactoryBase(heightRatio) { |
| public View create(final Context context) { |
| final Button button = new Button(context); |
| button.setText(text); |
| return button; |
| } |
| }); |
| return this; |
| } |
| |
| /** |
| * Add multiple buttons. |
| * @param numButtons the number of views to add. |
| * @param textPrefix The text to prepend to each button. |
| * @param heightRatio The view's height will be this * the screen height. |
| */ |
| public Params addButtons(int numButtons, String textPrefix, float heightRatio) { |
| for (int i = 0; i < numButtons; i++) { |
| addButton(textPrefix + i, heightRatio); |
| } |
| return this; |
| } |
| |
| /** |
| * Add an {@link InternalSelectionView}. |
| * @param numRows The number of rows in the internal selection view. |
| * @param heightRatio The view's height will be this * the screen height. |
| */ |
| public Params addInternalSelectionView(final int numRows, float heightRatio) { |
| mViewFactories.add(new ViewFactoryBase(heightRatio) { |
| public View create(final Context context) { |
| return new InternalSelectionView(context, numRows, "isv"); |
| } |
| }); |
| return this; |
| } |
| |
| /** |
| * Add a sublayout of buttons as a single child of the scroll view. |
| * @param numButtons The number of buttons in the sub layout |
| * @param heightRatio The layout's height will be this * the screen height. |
| */ |
| public Params addVerticalLLOfButtons(final String prefix, final int numButtons, float heightRatio) { |
| mViewFactories.add(new ViewFactoryBase(heightRatio) { |
| |
| public View create(Context context) { |
| final LinearLayout ll = new LinearLayout(context); |
| ll.setOrientation(LinearLayout.VERTICAL); |
| |
| // fill width, equally weighted on height |
| final LinearLayout.LayoutParams lp = |
| new LinearLayout.LayoutParams( |
| ViewGroup.LayoutParams.MATCH_PARENT, 0, 1f); |
| for (int i = 0; i < numButtons; i++) { |
| final Button button = new Button(context); |
| button.setText(prefix + i); |
| ll.addView(button, lp); |
| } |
| |
| return ll; |
| } |
| }); |
| return this; |
| } |
| } |
| |
| /** |
| * Override this and initialized the views in the scroll view. |
| * @param params Used to configure the contents of the scroll view. |
| */ |
| protected abstract void init(Params params); |
| |
| public LinearLayout getLinearLayout() { |
| return mLinearLayout; |
| } |
| |
| public ScrollView getScrollView() { |
| return mScrollView; |
| } |
| |
| /** |
| * Get the child contained within the vertical linear layout of the |
| * scroll view. |
| * @param index The index within the linear layout. |
| * @return the child within the vertical linear layout of the scroll view |
| * at the specified index. |
| */ |
| @SuppressWarnings({"unchecked"}) |
| public <T extends View> T getContentChildAt(int index) { |
| return (T) mLinearLayout.getChildAt(index); |
| } |
| |
| /** |
| * Hook for changing how scroll view's are created. |
| */ |
| @SuppressWarnings({"JavaDoc"}) |
| protected ScrollView createScrollView() { |
| return new ScrollView(this); |
| } |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| // for test stability, turn off title bar |
| requestWindowFeature(Window.FEATURE_NO_TITLE); |
| int screenHeight = getWindowManager().getDefaultDisplay().getHeight() |
| - 25; |
| mLinearLayout = new LinearLayout(this); |
| mLinearLayout.setOrientation(LinearLayout.VERTICAL); |
| |
| // initialize params |
| final Params params = new Params(); |
| init(params); |
| |
| // create views specified by params |
| for (ViewFactory viewFactory : params.mViewFactories) { |
| final LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams( |
| ViewGroup.LayoutParams.MATCH_PARENT, |
| (int) (viewFactory.getHeightRatio() * screenHeight)); |
| mLinearLayout.addView(viewFactory.create(this), lp); |
| } |
| |
| mScrollView = createScrollView(); |
| mScrollView.addView(mLinearLayout, new ViewGroup.LayoutParams( |
| ViewGroup.LayoutParams.MATCH_PARENT, |
| ViewGroup.LayoutParams.MATCH_PARENT)); |
| |
| // no animation to speed up tests |
| mScrollView.setSmoothScrollingEnabled(false); |
| |
| setContentView(mScrollView); |
| } |
| } |