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.android.bitmap.view; 18 19 import android.content.Context; 20 import android.graphics.Bitmap; 21 import android.graphics.drawable.Drawable; 22 import android.net.Uri; 23 import android.os.Build; 24 import android.util.AttributeSet; 25 import android.widget.ImageView; 26 27 import com.android.bitmap.drawable.BasicBitmapDrawable; 28 29 /** 30 * A helpful ImageView replacement that can generally be used in lieu of ImageView. 31 * BitmapDrawableImageView has logic to unbind its BasicBitmapDrawable when it is detached from the 32 * window. 33 */ 34 public class BitmapDrawableImageView extends ImageView { 35 private static final boolean HAS_TRANSIENT_STATE_SUPPORTED = 36 Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN; 37 private static final boolean TEMPORARY = true; 38 private static final boolean PERMANENT = !TEMPORARY; 39 40 private BasicBitmapDrawable mDrawable; 41 private boolean mAttachedToWindow; 42 BitmapDrawableImageView(final Context context)43 public BitmapDrawableImageView(final Context context) { 44 this(context, null); 45 } 46 BitmapDrawableImageView(final Context context, final AttributeSet attrs)47 public BitmapDrawableImageView(final Context context, final AttributeSet attrs) { 48 this(context, attrs, 0); 49 } 50 BitmapDrawableImageView(final Context context, final AttributeSet attrs, final int defStyle)51 public BitmapDrawableImageView(final Context context, final AttributeSet attrs, 52 final int defStyle) { 53 super(context, attrs, defStyle); 54 } 55 56 /** 57 * Get the source drawable for this BitmapDrawableImageView. 58 * @return The source drawable casted to the given type, or null if the type does not match. 59 */ 60 @SuppressWarnings("unchecked") // Cast to type parameter. getTypedDrawable()61 public <E extends BasicBitmapDrawable> E getTypedDrawable() { 62 try { 63 return (E) mDrawable; 64 } catch (Exception ignored) { 65 return null; 66 } 67 } 68 69 /** 70 * Set the given drawable as the source for this BitmapDrawableImageView. 71 * @param drawable The source drawable. 72 */ setTypedDrawable(E drawable)73 public <E extends BasicBitmapDrawable> void setTypedDrawable(E drawable) { 74 super.setImageDrawable(drawable); 75 unbindDrawable(); 76 mDrawable = drawable; 77 } 78 unbindDrawable()79 private void unbindDrawable() { 80 unbindDrawable(PERMANENT); 81 } 82 unbindDrawable(boolean temporary)83 private void unbindDrawable(boolean temporary) { 84 if (mDrawable != null) { 85 mDrawable.unbind(temporary); 86 } 87 } 88 89 @Override setImageResource(final int resId)90 public void setImageResource(final int resId) { 91 super.setImageResource(resId); 92 unbindDrawable(); 93 mDrawable = null; 94 } 95 96 @Override setImageURI(final Uri uri)97 public void setImageURI(final Uri uri) { 98 super.setImageURI(uri); 99 unbindDrawable(); 100 mDrawable = null; 101 } 102 103 @Override setImageDrawable(final Drawable drawable)104 public void setImageDrawable(final Drawable drawable) { 105 super.setImageDrawable(drawable); 106 unbindDrawable(); 107 mDrawable = null; 108 } 109 110 @Override setImageBitmap(final Bitmap bm)111 public void setImageBitmap(final Bitmap bm) { 112 super.setImageBitmap(bm); 113 unbindDrawable(); 114 mDrawable = null; 115 } 116 117 @Override onAttachedToWindow()118 protected void onAttachedToWindow() { 119 super.onAttachedToWindow(); 120 mAttachedToWindow = true; 121 if (mDrawable != null && mDrawable.getKey() == null 122 && mDrawable.getPreviousKey() != null) { 123 mDrawable.bind(mDrawable.getPreviousKey()); 124 } 125 } 126 127 @Override onDetachedFromWindow()128 protected void onDetachedFromWindow() { 129 super.onDetachedFromWindow(); 130 mAttachedToWindow = false; 131 if (HAS_TRANSIENT_STATE_SUPPORTED && !hasTransientState()) { 132 unbindDrawable(TEMPORARY); 133 } 134 } 135 136 @Override setHasTransientState(boolean hasTransientState)137 public void setHasTransientState(boolean hasTransientState) { 138 super.setHasTransientState(hasTransientState); 139 if (!hasTransientState && !mAttachedToWindow) { 140 unbindDrawable(TEMPORARY); 141 } 142 } 143 } 144