Android - ImageView:setImageBitmap VS setImageDrawable

问题描述

setImageBitmap 和 setImageDrawable 有什么区别?

我有一个图像，我想从文件中动态设置它.我遵循的教程说将我的 Bitmap 转换为 BitmapDrawable 然后使用 setImageDrawable 设置它.我注意到直接使用 setImageBitmap 设置 Bitmap 也有效，但我没有注意到任何区别.

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);

或

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

推荐答案

两者内部没有区别setImageBitmap就是调用setImageDrawable.

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

以下代码摘自 AOSP 的 ImageView.java

Below code is picked from ImageView.java of AOSP

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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