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.content.Context; 20 import android.graphics.Canvas; 21 import android.util.AttributeSet; 22 import android.widget.ListView; 23 24 import com.android.bitmap.drawable.ExtendedBitmapDrawable; 25 import com.android.bitmap.view.BitmapDrawableImageView; 26 27 public class BitmapView extends BitmapDrawableImageView { 28 private final float mDensity; 29 30 private ListView mListView; 31 32 public BitmapView(Context c) { 33 this(c, null); 34 } 35 36 public BitmapView(Context c, AttributeSet attrs) { 37 super(c, attrs); 38 mDensity = getResources().getDisplayMetrics().density; 39 } 40 41 @Override 42 protected int getSuggestedMinimumHeight() { 43 return (int) (100 * mDensity); 44 } 45 46 @Override 47 protected void onSizeChanged(final int w, final int h, int oldw, int oldh) { 48 ExtendedBitmapDrawable drawable = getTypedDrawable(); 49 drawable.setDecodeDimensions(w, h); 50 } 51 52 public void setListView(final ListView listView) { 53 mListView = listView; 54 } 55 56 @Override 57 protected void onDraw(final Canvas canvas) { 58 ExtendedBitmapDrawable drawable = getTypedDrawable(); 59 float fraction = (float) getBottom() / (mListView.getHeight() + getHeight()); 60 drawable.setParallaxFraction(fraction); 61 62 super.onDraw(canvas); 63 } 64 }
