Android处理图像数据全记录

技术小黑屋

发布于 2018-09-04 17:20:31

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发布于 2018-09-04 17:20:31

文章被收录于专栏：技术小黑屋

Android中处理图像是一件很常见的事情，这里记录备忘一些亲身使用过的处理图片数据的方法。

转为Bitmap

RGB值转Bitmap

1 2 3 4 5 6 7 8 9	private Bitmap createColorBitmap(String rgb, int width, int height) { Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int color = Color.parseColor(rgb); bmp.eraseColor(color); return bmp; } //Usage Bitmap bmp = createColorBitmap("#cce8cf", 200, 50);

Color值转Bitmap

1 2 3 4 5 6 7	private Bitmap createColorBitmap(int color, int width, int height) { Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bmp.eraseColor(color); return bmp; } //Usage Bitmap bmp = createColorBitmap(Color.BLUE, 200, 50);

字节数组转Bitmap

1 2 3	private Bitmap getBitmapFromByteArray(byte[] array) { return BitmapFactory.decodeByteArray(array, 0, array.length); }

读取文件转Bitmap

1 2 3	private Bitmap getBitmapFromFile(String pathName) { return BitmapFactory.decodeFile(pathName); }

读取资源转Bitmap

1 2 3	private Bitmap getBitmapFromResource(Resources res, int resId) { return BitmapFactory.decodeResource(res, resId); }

输入流转Bitmap

1 2 3	private Bitmap getBitmapFromStream(InputStream inputStream) { return BitmapFactory.decodeStream(inputStream); }

Drawable转Bitmap

1	Bitmap icon = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_resource);

转为Drawable

资源转Drawable

1	Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);

Bitmap转Drawable

1	Drawable d = new BitmapDrawable(getResources(),bitmap);

图片圆角展示

通过对图片数据bitmap进行处理即可，其中pixels为边角的半径。

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap .getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); final float roundPx = pixels; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; }

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