BitmapDrawableImageView.java revision 9024423249c9b1779f523cc4fe757fda2d205844 
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.android.bitmap.view;
18
19import android.content.Context;
20import android.graphics.Bitmap;
21import android.graphics.drawable.Drawable;
22import android.net.Uri;
23import android.util.AttributeSet;
24import android.widget.ImageView;
25
26import com.android.bitmap.drawable.BasicBitmapDrawable;
27
28/**
29 * A helpful ImageView replacement that can generally be used in lieu of ImageView.
30 * BitmapDrawableImageView has logic to unbind its BasicBitmapDrawable when it is detached from the
31 * window.
32 */
33public class BitmapDrawableImageView extends ImageView {
34    private BasicBitmapDrawable mDrawable;
35    private boolean mAttachedToWindow;
36
37    public BitmapDrawableImageView(final Context context) {
38        this(context, null);
39    }
40
41    public BitmapDrawableImageView(final Context context, final AttributeSet attrs) {
42        this(context, attrs, 0);
43    }
44
45    public BitmapDrawableImageView(final Context context, final AttributeSet attrs,
46            final int defStyle) {
47        super(context, attrs, defStyle);
48    }
49
50    /**
51     * Get the source drawable for this BitmapDrawableImageView.
52     * @return The source drawable casted to the given type, or null if the type does not match.
53     */
54    @SuppressWarnings("unchecked") // Cast to type parameter.
55    public <E extends BasicBitmapDrawable> E getTypedDrawable() {
56        try {
57            return (E) mDrawable;
58        } catch (Exception ignored) {
59            return null;
60        }
61    }
62
63    /**
64     * Set the given drawable as the source for this BitmapDrawableImageView.
65     * @param drawable The source drawable.
66     */
67    public <E extends BasicBitmapDrawable> void setTypedDrawable(E drawable) {
68        super.setImageDrawable(drawable);
69        unbindDrawable();
70        mDrawable = drawable;
71    }
72
73    private void unbindDrawable() {
74        if (mDrawable != null) {
75            mDrawable.unbind();
76        }
77    }
78
79    @Override
80    public void setImageResource(final int resId) {
81        super.setImageResource(resId);
82        unbindDrawable();
83        mDrawable = null;
84    }
85
86    @Override
87    public void setImageURI(final Uri uri) {
88        super.setImageURI(uri);
89        unbindDrawable();
90        mDrawable = null;
91    }
92
93    @Override
94    public void setImageDrawable(final Drawable drawable) {
95        super.setImageDrawable(drawable);
96        unbindDrawable();
97        mDrawable = null;
98    }
99
100    @Override
101    public void setImageBitmap(final Bitmap bm) {
102        super.setImageBitmap(bm);
103        unbindDrawable();
104        mDrawable = null;
105    }
106
107    @Override
108    protected void onAttachedToWindow() {
109        super.onAttachedToWindow();
110        mAttachedToWindow = true;
111    }
112
113    @Override
114    protected void onDetachedFromWindow() {
115        super.onDetachedFromWindow();
116        mAttachedToWindow = false;
117        if (!hasTransientState()) {
118            unbindDrawable();
119        }
120    }
121
122    @Override
123    public void setHasTransientState(boolean hasTransientState) {
124        super.setHasTransientState(hasTransientState);
125        if (!hasTransientState && !mAttachedToWindow) {
126            unbindDrawable();
127        }
128    }
129}
130