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      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 android.widget.focus;
     18 
     19 import android.app.Activity;
     20 import android.os.Bundle;
     21 import android.view.View;
     22 import android.view.ViewGroup;
     23 import android.widget.BaseAdapter;
     24 import android.widget.ListView;
     25 import 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  */
     31 public 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