xUtils源码阅读（6）-AsyncDrawable

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AsyncDrawable，异步图片。
源码：
/** * Author: wyouflf * Date: 13-11-17 * Time: 上午11:42 */public final class AsyncDrawable extends Drawable {    private final WeakReference<ImageLoader> imageLoaderReference;    private Drawable baseDrawable;//对原图片的包装    public AsyncDrawable(ImageLoader imageLoader, Drawable drawable) {        if (imageLoader == null) {            throw new IllegalArgumentException("imageLoader may not be null");        }        baseDrawable = drawable;        while (baseDrawable instanceof AsyncDrawable) {            baseDrawable = ((AsyncDrawable) baseDrawable).baseDrawable;        }        imageLoaderReference = new WeakReference<ImageLoader>(imageLoader);    }    public ImageLoader getImageLoader() {        return imageLoaderReference.get();    }    public void setBaseDrawable(Drawable baseDrawable) {        this.baseDrawable = baseDrawable;    }    public Drawable getBaseDrawable() {        return baseDrawable;    }    //以下几个函数作为对Drawable的包装，要调用被包装对象的方法实现    @Override    public void draw(Canvas canvas) {        if (baseDrawable != null) {            baseDrawable.draw(canvas);        }    }    @Override    public void setAlpha(int i) {        if (baseDrawable != null) {            baseDrawable.setAlpha(i);        }    }    @Override    public void setColorFilter(ColorFilter colorFilter) {        if (baseDrawable != null) {            baseDrawable.setColorFilter(colorFilter);        }    }    @Override    public int getOpacity() {        return baseDrawable == null ? PixelFormat.TRANSLUCENT : baseDrawable.getOpacity();    }    @Override    public void setBounds(int left, int top, int right, int bottom) {        if (baseDrawable != null) {            baseDrawable.setBounds(left, top, right, bottom);        }    }    @Override    public void setBounds(Rect bounds) {        if (baseDrawable != null) {            baseDrawable.setBounds(bounds);        }    }    @Override    public void setChangingConfigurations(int configs) {        if (baseDrawable != null) {            baseDrawable.setChangingConfigurations(configs);        }    }    @Override    public int getChangingConfigurations() {        return baseDrawable == null ? 0 : baseDrawable.getChangingConfigurations();    }    @Override    public void setDither(boolean dither) {        if (baseDrawable != null) {            baseDrawable.setDither(dither);        }    }    @Override    public void setFilterBitmap(boolean filter) {        if (baseDrawable != null) {            baseDrawable.setFilterBitmap(filter);        }    }    @Override    public void invalidateSelf() {        if (baseDrawable != null) {            baseDrawable.invalidateSelf();        }    }    @Override    public void scheduleSelf(Runnable what, long when) {        if (baseDrawable != null) {            baseDrawable.scheduleSelf(what, when);        }    }    @Override    public void unscheduleSelf(Runnable what) {        if (baseDrawable != null) {            baseDrawable.unscheduleSelf(what);        }    }    @Override    public void setColorFilter(int color, PorterDuff.Mode mode) {        if (baseDrawable != null) {            baseDrawable.setColorFilter(color, mode);        }    }    @Override    public void clearColorFilter() {        if (baseDrawable != null) {            baseDrawable.clearColorFilter();        }    }    @Override    public boolean isStateful() {        return baseDrawable != null && baseDrawable.isStateful();    }    @Override    public boolean setState(int[] stateSet) {        return baseDrawable != null && baseDrawable.setState(stateSet);    }    @Override    public int[] getState() {        return baseDrawable == null ? null : baseDrawable.getState();    }    @Override    public Drawable getCurrent() {        return baseDrawable == null ? null : baseDrawable.getCurrent();    }    @Override    public boolean setVisible(boolean visible, boolean restart) {        return baseDrawable != null && baseDrawable.setVisible(visible, restart);    }    @Override    public Region getTransparentRegion() {        return baseDrawable == null ? null : baseDrawable.getTransparentRegion();    }    @Override    public int getIntrinsicWidth() {        return baseDrawable == null ? 0 : baseDrawable.getIntrinsicWidth();    }    @Override    public int getIntrinsicHeight() {        return baseDrawable == null ? 0 : baseDrawable.getIntrinsicHeight();    }    @Override    public int getMinimumWidth() {        return baseDrawable == null ? 0 : baseDrawable.getMinimumWidth();    }    @Override    public int getMinimumHeight() {        return baseDrawable == null ? 0 : baseDrawable.getMinimumHeight();    }    @Override    public boolean getPadding(Rect padding) {        return baseDrawable != null && baseDrawable.getPadding(padding);    }    @Override    public Drawable mutate() {        return baseDrawable == null ? null : baseDrawable.mutate();    }    @Override    public ConstantState getConstantState() {        return baseDrawable == null ? null : baseDrawable.getConstantState();    }    @Override    protected void finalize() throws Throwable {//因为是异步，所以还要停止对应的loader        super.finalize();        ImageLoader imageLoader = this.getImageLoader();        if (imageLoader != null) {            imageLoader.cancel();        }    }}
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