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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.graphics.Point;
     21 import android.os.Bundle;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 import android.widget.BaseAdapter;
     25 import android.widget.ListView;
     26 import android.util.InternalSelectionView;
     27 
     28 /**
     29  * A list of {@link InternalSelectionView}s paramatarized by the number of items,
     30  * how many rows in each item, and how tall each item is.
     31  */
     32 public class ListOfInternalSelectionViews extends Activity {
     33 
     34     private ListView mListView;
     35 
     36 
     37     // keys for initializing via Intent params
     38     public static final String BUNDLE_PARAM_NUM_ITEMS = "com.google.test.numItems";
     39     public static final String BUNDLE_PARAM_NUM_ROWS_PER_ITEM = "com.google.test.numRowsPerItem";
     40     public static final String BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR = "com.google.test.itemScreenHeightFactor";
     41 
     42     private int mScreenHeight;
     43 
     44     private int mNumItems = 5;
     45     private int mNumRowsPerItem = 4;
     46     private double mItemScreenSizeFactor = 5 / 4;
     47 
     48     public ListView getListView() {
     49         return mListView;
     50     }
     51 
     52     /**
     53      * Each item is screen height * this factor tall.
     54      */
     55     public double getItemScreenSizeFactor() {
     56         return mItemScreenSizeFactor;
     57     }
     58 
     59     /**
     60      * @return The number of rows per item.
     61      */
     62     public int getNumRowsPerItem() {
     63         return mNumRowsPerItem;
     64     }
     65 
     66     /**
     67      * @return The number of items in the list.
     68      */
     69     public int getNumItems() {
     70         return mNumItems;
     71     }
     72 
     73     /**
     74      * @param position The position
     75      * @return The label (closest thing to a value) for the item at position
     76      */
     77     public String getLabelForPosition(int position) {
     78         return "position " + position;
     79     }
     80 
     81     /**
     82      * Get the currently selected view.
     83      */
     84     public InternalSelectionView getSelectedView() {
     85         return (InternalSelectionView) getListView().getSelectedView();
     86     }
     87 
     88     /**
     89      * Get the screen height.
     90      */
     91     public int getScreenHeight() {
     92         return mScreenHeight;
     93     }
     94 
     95     /**
     96      * Initialize a bundle suitable for sending as the params of the intent that
     97      * launches this activity.
     98      * @param numItems The number of items in the list.
     99      * @param numRowsPerItem The number of rows per item.
    100      * @param itemScreenHeightFactor see {@link #getScreenHeight()}
    101      * @return the intialized bundle.
    102      */
    103     public static Bundle getBundleFor(int numItems, int numRowsPerItem, double itemScreenHeightFactor) {
    104         Bundle bundle = new Bundle();
    105         bundle.putInt(BUNDLE_PARAM_NUM_ITEMS, numItems);
    106         bundle.putInt(BUNDLE_PARAM_NUM_ROWS_PER_ITEM, numRowsPerItem);
    107         bundle.putDouble(BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR, itemScreenHeightFactor);
    108         return bundle;
    109     }
    110 
    111     @Override
    112     protected void onCreate(Bundle icicle) {
    113         super.onCreate(icicle);
    114 
    115         Point size = new Point();
    116         getWindowManager().getDefaultDisplay().getSize(size);
    117         mScreenHeight = size.y;
    118 
    119         Bundle extras = getIntent().getExtras();
    120         if (extras != null) {
    121             initFromBundle(extras);
    122         }
    123 
    124         mListView = new ListView(this);
    125         mListView.setLayoutParams(new ViewGroup.LayoutParams(
    126                 ViewGroup.LayoutParams.MATCH_PARENT,
    127                 ViewGroup.LayoutParams.MATCH_PARENT));
    128         mListView.setDrawSelectorOnTop(false);
    129         mListView.setAdapter(new MyAdapter());
    130         mListView.setItemsCanFocus(true);
    131         setContentView(mListView);
    132     }
    133 
    134     private void initFromBundle(Bundle icicle) {
    135 
    136         int numItems = icicle.getInt(BUNDLE_PARAM_NUM_ITEMS, -1);
    137         if (numItems != -1) {
    138             mNumItems = numItems;
    139         }
    140         int numRowsPerItem = icicle.getInt(BUNDLE_PARAM_NUM_ROWS_PER_ITEM, -1);
    141         if (numRowsPerItem != -1) {
    142             mNumRowsPerItem = numRowsPerItem;
    143         }
    144         double screenHeightFactor = icicle.getDouble(BUNDLE_PARAM_ITEM_SCREEN_HEIGHT_FACTOR, -1.0);
    145         if (screenHeightFactor > 0) {
    146             mItemScreenSizeFactor = screenHeightFactor;
    147         }
    148     }
    149 
    150     private class MyAdapter extends BaseAdapter {
    151 
    152         public int getCount() {
    153             return mNumItems;
    154         }
    155 
    156         public Object getItem(int position) {
    157             return getLabelForPosition(position);
    158         }
    159 
    160         public long getItemId(int position) {
    161             return position;
    162         }
    163 
    164         public View getView(int position, View convertView, ViewGroup parent) {
    165             InternalSelectionView item =
    166                     new InternalSelectionView(
    167                             parent.getContext(),
    168                             mNumRowsPerItem,
    169                             getLabelForPosition(position));
    170             item.setDesiredHeight((int) (mScreenHeight * mItemScreenSizeFactor));
    171             return item;
    172         }
    173     }
    174 }
    175