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android_dp_analysis_code's Issues

线程池中非主线程更新ImageView,更新成功的问题。

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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