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View Code? Open in Web Editor NEW《Android 源码设计模式解析与实战》示例代码
《Android 源码设计模式解析与实战》示例代码
在书中第二页第一章的例子中,为什么没有使用Handler就可以直接在子线程中更新ImageView?代码通过我调试,发现确实更新了ImageView,并且没有报异常。部分代码如下:
public void displayImage(final String url, final ImageView imageView) {
imageView.setTag(url);
mExecutorService.submit(new Runnable() {
@Override
public void run() {
Bitmap bitmap = downloadImage(url);
if (bitmap == null) {
return;
}
if (imageView.getTag().equals(url)) {
imageView.setImageBitmap(bitmap);
}
bitmap.recycle();
mImageCache.put(url, bitmap);
}
});
}
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