getPixels

public void getPixels (int[] pixels, int offset, int stride, int x, int y, int width, int height)

Since: API Level 1

Returns in pixels[] a copy of the data in the bitmap. Each value is a packed int representing a Color. The stride parameter allows the caller to allow for gaps in the returned pixels array between rows. For normal packed results, just pass width for the stride value.

Parameters

pixels	The array to receive the bitmap's colors
offset	The first index to write into pixels[]
stride	The number of entries in pixels[] to skip between rows (must be >= bitmap's width). Can be negative.
x	The x coordinate of the first pixel to read from the bitmap
y	The y coordinate of the first pixel to read from the bitmap
width	The number of pixels to read from each row
height	The number of rows to read

 

IllegalArgumentException    if x, y, width, height exceed the bounds of the bitmap, or if abs(stride) <  width ArrayIndexOutOfBoundsException   if the pixels array is too small to receive the specified number of pixels IllegalArgumentException if x, y, width, height exceed the bounds of the bitmap, or if abs(stride) < width. ArrayIndexOutOfBoundsException

 

 

 

例：

      mBarPixels = new int[mWidth * mHeight];

     mBarBitmap.getPixels(mBarPixels, 0, mWidth, i, 0, mWidth, mHeight);

//从（i,0）点 开始截取像素，放入 mBarPixels 数组中。

      canvas.drawBitmap(mBarPixels, 0, mWidth, 0, 0, mWidth, mHeight, true, null);

//使用像素

public void drawBitmap (int[] colors, int offset, int stride, float x, float y, int width, int height, boolean hasAlpha, Paint paint)

colors	Array of colors representing the pixels of the bitmap
offset	Offset into the array of colors for the first pixel
stride	The number of colors in the array between rows (must be >= width or <= -width).
x	The X coordinate for where to draw the bitmap
y	The Y coordinate for where to draw the bitmap
width	The width of the bitmap
height	The height of the bitmap
hasAlpha	True if the alpha channel of the colors contains valid values. If false, the alpha byte is ignored (assumed to be 0xFF for every pixel).
paint	May be null. The paint used to draw the bitmap