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在 Android 中创建一个空位图并通过画布进行绘制

发布于 2024-11-01 20:03:41 字数 40 浏览 1 评论 0原文

我想创建一个空位图并将画布设置为该位图，然后在位图上绘制任何形状。

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金兰素衣 2024-11-08 20:03:41

这可能比您想象的要简单：

int w = WIDTH_PX, h = HEIGHT_PX;

Bitmap.Config conf = Bitmap.Config.ARGB_8888; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);

// ready to draw on that bitmap through that canvas

这是有关该主题的官方文档：自定义绘图

This is probably simpler than you're thinking:

int w = WIDTH_PX, h = HEIGHT_PX;

Bitmap.Config conf = Bitmap.Config.ARGB_8888; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);

// ready to draw on that bitmap through that canvas

Here's the official documentation on the topic: Custom Drawing

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Oo萌小芽oO 2024-11-08 20:03:41

不要使用 Bitmap.Config.ARGB_8888

而是使用
int w = WIDTH_PX, h = HEIGHT_PX;

Bitmap.Config conf = Bitmap.Config.ARGB_4444; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);

// ready to draw on that bitmap through that canvas

在处理更多位图或大位图时，ARGB_8888 可能会导致内存不足问题。
或者更好的是，尝试避免使用 ARGB 选项本身。

Do not use Bitmap.Config.ARGB_8888

Instead use
int w = WIDTH_PX, h = HEIGHT_PX;

Bitmap.Config conf = Bitmap.Config.ARGB_4444; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);

// ready to draw on that bitmap through that canvas

ARGB_8888 can land you in OutOfMemory issues when dealing with more bitmaps or large bitmaps.
Or better yet, try avoiding usage of ARGB option itself.

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