1 /* 2 * Copyright (C) 2013 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.bitmapsample; 18 19 import android.app.Activity; 20 import android.content.res.Resources; 21 import android.graphics.Color; 22 import android.graphics.drawable.Drawable; 23 import android.os.Bundle; 24 import android.view.View; 25 import android.view.ViewGroup; 26 import android.widget.BaseAdapter; 27 import android.widget.ListView; 28 29 import com.android.bitmap.BitmapCache; 30 import com.android.bitmap.DecodeAggregator; 31 import com.android.bitmap.UnrefedBitmapCache; 32 import com.android.bitmap.drawable.ExtendedBitmapDrawable; 33 import com.android.bitmap.drawable.ExtendedBitmapDrawable.ExtendedOptions; 34 35 public class MainActivity extends Activity { 36 37 private ListView mListView; 38 private final BitmapCache mCache = new UnrefedBitmapCache(TARGET_CACHE_SIZE_BYTES, 0, 0); 39 private final DecodeAggregator mDecodeAggregator = new DecodeAggregator(); 40 41 private static Drawable PLACEHOLDER; 42 private static Drawable PROGRESS; 43 44 private static final float NORMAL_PARALLAX_MULTIPLIER = 1.5f; 45 private static final int TARGET_CACHE_SIZE_BYTES = 5 * 1024 * 1024; 46 47 @Override onCreate(Bundle savedInstanceState)48 protected void onCreate(Bundle savedInstanceState) { 49 super.onCreate(savedInstanceState); 50 setContentView(R.layout.activity_main); 51 52 if (PLACEHOLDER == null) { 53 Resources res = getResources(); 54 PLACEHOLDER = res.getDrawable(R.drawable.ic_placeholder); 55 PROGRESS = res.getDrawable(R.drawable.progress); 56 } 57 58 mListView = (ListView) findViewById(R.id.list); 59 mListView.setAdapter(new MyAdapter()); 60 } 61 62 private class MyAdapter extends BaseAdapter { 63 64 private final String[] mItems; 65 66 private final String[] ITEMS = new String[]{ 67 "https://www.google.com/images/srpr/logo4w.png", 68 "http://www.google.com/logos/2012/celibidache12-hp.jpg", 69 "http://www.google.com/logos/2012/clara_schuman-2012-hp.jpg", 70 "http://www.google.com/logos/2011/royalwedding11-hp.png", 71 "http://www.google.com/logos/2012/vets_day-12-hp.jpg", 72 "http://www.google.com/logos/2011/firstmaninspace11-hp-js.jpg", 73 "http://www.google.com/logos/2011/nat-sov-and-childrens-turkey-hp.png", 74 "http://www.google.com/logos/2012/First_Day_Of_School_Isreal-2012-hp.jpg", 75 "http://www.google.com/logos/2012/celibidache12-hp.jpg", 76 "http://www.google.com/logos/2012/korea12-hp.png" 77 }; 78 79 private static final int COPIES = 50; 80 MyAdapter()81 public MyAdapter() { 82 mItems = new String[ITEMS.length * COPIES]; 83 for (int i = 0; i < COPIES; i++) { 84 for (int j = 0; j < ITEMS.length; j++) { 85 mItems[i * ITEMS.length + j] = ITEMS[j]; 86 } 87 } 88 } 89 90 @Override getCount()91 public int getCount() { 92 return mItems.length; 93 } 94 95 @Override getItem(int position)96 public Object getItem(int position) { 97 return mItems[position]; 98 } 99 100 @Override getItemId(int position)101 public long getItemId(int position) { 102 return position; 103 } 104 105 @Override getView(int position, View convertView, ViewGroup parent)106 public View getView(int position, View convertView, ViewGroup parent) { 107 BitmapView v; 108 if (convertView != null) { 109 v = (BitmapView) convertView; 110 } else { 111 v = new BitmapView(MainActivity.this); 112 ExtendedOptions opts = new ExtendedOptions( 113 ExtendedOptions.FEATURE_ORDERED_DISPLAY | ExtendedOptions.FEATURE_PARALLAX 114 | ExtendedOptions.FEATURE_STATE_CHANGES, PLACEHOLDER, PROGRESS); 115 opts.decodeAggregator = mDecodeAggregator; 116 opts.parallaxSpeedMultiplier = NORMAL_PARALLAX_MULTIPLIER; 117 opts.backgroundColor = Color.LTGRAY; 118 final ExtendedBitmapDrawable drawable = new ExtendedBitmapDrawable(getResources(), 119 mCache, true /* limit density */, opts); 120 121 v.setTypedDrawable(drawable); 122 v.setListView(mListView); 123 } 124 v.getTypedDrawable().bind(new BitmapRequestKeyImpl(mItems[position])); 125 return v; 126 } 127 } 128 } 129
