BitmapView.java revision 2e4d0863dba53435372ec96538f2ef3e1c3675bf 
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
17package com.example.bitmapsample;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.util.AttributeSet;
22import android.widget.ListView;
23
24import com.android.bitmap.drawable.BasicBitmapDrawable;
25import com.android.bitmap.drawable.ExtendedBitmapDrawable;
26import com.android.bitmap.view.BitmapDrawableImageView;
27
28public class BitmapView extends BitmapDrawableImageView {
29    private final float mDensity;
30
31    private ListView mListView;
32    private float mParallaxSpeedMultiplier;
33
34    public BitmapView(Context c) {
35        this(c, null);
36    }
37
38    public BitmapView(Context c, AttributeSet attrs) {
39        super(c, attrs);
40        mDensity = getResources().getDisplayMetrics().density;
41    }
42
43    @Override
44    protected int getSuggestedMinimumHeight() {
45        return (int) (100 * mDensity);
46    }
47
48    @Override
49    protected void onSizeChanged(final int w, final int h, int oldw, int oldh) {
50        ExtendedBitmapDrawable drawable = (ExtendedBitmapDrawable) getBasicBitmapDrawable();
51        drawable.setDecodeDimensions(w, (int) (h * mParallaxSpeedMultiplier));
52    }
53
54    public void setListView(final ListView listView) {
55        mListView = listView;
56    }
57
58    @Override
59    protected void onDraw(final Canvas canvas) {
60        ExtendedBitmapDrawable drawable = (ExtendedBitmapDrawable) getBasicBitmapDrawable();
61        float fraction = (float) getBottom() / (mListView.getHeight() + getHeight());
62        drawable.setParallaxFraction(fraction);
63
64        super.onDraw(canvas);
65    }
66
67    public void setParallaxSpeedMultiplier(final float parallaxSpeedMultiplier) {
68        mParallaxSpeedMultiplier = parallaxSpeedMultiplier;
69    }
70}