Android系统色彩模式RGB_565的问题
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 25/100
- Issue type
- Documentation
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- android, java
- Domain
- documentation, mobile-dev
Research direction
Start by reviewing the chapter that states Android’s default color mode is RGB_565, then inspect the shown onDraw example using BitmapFactory.decodeResource, Bitmap, Canvas, and R.mipmap.maps. Compare the documented claim with the reported bitmap dimensions and byte count, and update the relevant explanation so it clearly distinguishes image configuration from device behavior.
Written by the indexing model from the issue text.
Description
记得作者之前章节写过，Android的默认色彩模式是RGB_565.
我在后面章节在做测试时发现一个问题：
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.maps);
canvas.drawBitmap(bitmap, new Matrix(), null);
}
我的bitmap的大小是byte[394383], 图片分辨率是314 * 314。计算一下，394383 / (314 * 314) = 4。也就是说一个像素点占位4个字节。（RGB_565我记得是1个像素占位2个字节，而ARGB_8888是1个像素4个字节）
问下，是不是Android的默认色彩模式不同的手机系统不一样？还是只是图片色彩模式不一样？
- Dominant language
- Java
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- 9.3k
- Forks
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- PR merge metrics
- No merged PRs in 30d
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