更改 ImageView 源 [英] Changing ImageView source

问题描述

我有一个 ImageView，其中使用以下语法在 xml 中设置了源图像:

I have an ImageView with a source image set in the xml using the following syntax:

   <ImageView 
      android:id="@+id/articleImg"
      style="@style/articleImgSmall_2"
      android:src="@drawable/default_m" />

现在我需要以编程方式更改此图像.我需要做的是删除旧图像并添加一个新图像.我所做的是:

Now I need to change this image programmatically. What I need to do is delete the old image and add a new one though. What I have done is this:

myImgView.setBackgroundResource(R.drawable.monkey);

它有效，但我注意到 android 将新图像堆叠在旧图像之上(不要问我是如何发现它与讨论无关的:).在设置新图像之前，我肯定需要摆脱旧图像.

It works but I noticed android stacks the new image on top of the old one (dont ask me how I found out it's not relevant for the discussion :). I definitely need to get rid of the old one before setting the new image.

我怎样才能做到这一点?

How can I achieve that?

推荐答案

更改 ImageView 源:

使用setBackgroundResource() 方法:

  myImgView.setBackgroundResource(R.drawable.monkey);

你把那只猴子放在了背景中.

you are putting that monkey in the background.

我建议使用 setImageResource() 方法:

I suggest the use of setImageResource() method:

  myImgView.setImageResource(R.drawable.monkey);

或使用 setImageDrawable() 方法:

or with setImageDrawable() method:

myImgView.setImageDrawable(getResources().getDrawable(R.drawable.monkey));

*** 使用新的 android API 22 getResources().getDrawable() 现在已弃用.这是现在如何使用的示例:

*** With new android API 22 getResources().getDrawable() is now deprecated. This is an example how to use now:

myImgView.setImageDrawable(getResources().getDrawable(R.drawable.monkey, getApplicationContext().getTheme()));

以及如何验证旧 API 版本:

and how to validate for old API versions:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
     myImgView.setImageDrawable(getResources().getDrawable(R.drawable.monkey, getApplicationContext().getTheme()));
   } else {
     myImgView.setImageDrawable(getResources().getDrawable(R.drawable.monkey));
}

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