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

复制代码 代码如下:

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

复制代码 代码如下:
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

复制代码 代码如下:
private Bitmap getBitmapFromByteArray(byte[] array) {
return BitmapFactory.decodeByteArray(array, 0, array.length);
}

读取文件转Bitmap

复制代码 代码如下:
private Bitmap getBitmapFromFile(String pathName) {
return BitmapFactory.decodeFile(pathName);
}

读取资源转Bitmap

复制代码 代码如下:
private Bitmap getBitmapFromResource(Resources res, int resId) {
return BitmapFactory.decodeResource(res, resId);
}

输入流转Bitmap

复制代码 代码如下:
private Bitmap getBitmapFromStream(InputStream inputStream) {
return BitmapFactory.decodeStream(inputStream);
}

Drawable转Bitmap

复制代码 代码如下:
Bitmap icon = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_resource);

转为Drawable

资源转Drawable

复制代码 代码如下:
Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);

Bitmap转Drawable

复制代码 代码如下:
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。

复制代码 代码如下:

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;
}