Android - ImageView：setImageBitmap VS setImageDrawable [英] Android - ImageView: setImageBitmap VS setImageDrawable

问题描述

setImageBitmap 和 setImageDrawable 之间有什么区别？

我有一个我想从文件中动态设置的图像。我遵循的教程说我将位图转换为 BitmapDrawable 然后使用 setImageDrawable设置它。我注意到直接用 setImageBitmap 设置位图也有效，但我没有发现任何差异。

I have an image which I would like to set dynamically from file. The tutorial that I followed says to convert my Bitmap to a BitmapDrawable then set it using setImageDrawable. I've notice that setting the Bitmap directly with setImageBitmap also works but I don't notice any difference.

Bitmap image = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
BitmapDrawable bitmapDrawable = new BitmapDrawable(image);
imageView.setImageDrawable(bitmapDrawable);

OR

Bitmap image = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
imageView.setImageBitmap(image);

推荐答案

内部两个没有区别 setImageBitmap 正在调用 setImageDrawable 。

There is no difference between the two internally setImageBitmap is calling setImageDrawable.

下面的代码是从 AOSP的ImageView.java

public void setImageBitmap(Bitmap bm) {
    // if this is used frequently, may handle bitmaps explicitly
    // to reduce the intermediate drawable object
    setImageDrawable(new BitmapDrawable(mContext.getResources(), bm));
}

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