Drawable.setColorFilter（）不工作在Android 2.1 [英] Drawable.setColorFilter() not working on Android 2.1

问题描述

Drawable d = new BitmapDrawable(BitmapFactory.decodeResource(
    getResources(), R.drawable.ic_watch));
d.setColorFilter(new LightingColorFilter(color, lightenColor));
imageView.setImageDrawable(d);

在Android 2.2（模拟器）和2.3（N1）setColorFilter（）工作正常。它为什么不能在2.1的工作（在模拟器测试）？另外Android的bug？

On Android 2.2 (emulator) and 2.3 (N1) setColorFilter() works fine. Why doesn't it work on 2.1 (tested on emulator)? Another Android bug?

推荐答案

您需要让你的位图可变的。

// make a mutable Bitmap
Bitmap immutableBitmap = BitmapFactory.decodeResource(getResources(), 
    R.drawable.ic_watch);
Bitmap mutableBitmap = immutableBitmap.copy(Bitmap.Config.ARGB_8888, true);

// you have two bitmaps in memory, so clean up the mess a bit
immutableBitmap.recycle(); immutableBitmap=null;

Drawable d = new BitmapDrawable(mutableBitmap);

// mutate it
d.setColorFilter(new LightingColorFilter(color, lightenColor));

imageView.setImageDrawable(d);

您可以看到这个问题突然出现在<一个href="http://stackoverflow.com/questions/4349075/bitmapfactory-de$c$cresource-returns-a-mutable-bitmap-in-android-2-2-and-an-immut">here,了。

You can see this problem cropping up over here, too.

这篇关于Drawable.setColorFilter（）不工作在Android 2.1的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！