Android处理图像数据转换的各种方法

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

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

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

private Bitmap getBitmapFromByteArray(byte[] array) {

  return BitmapFactory.decodeByteArray(array, 0, array.length);

}

读取文件转Bitmap

private Bitmap getBitmapFromFile(String pathName) {

      return BitmapFactory.decodeFile(pathName);

}

读取资源转Bitmap

private Bitmap getBitmapFromResource(Resources res, int resId) {

      return BitmapFactory.decodeResource(res, resId);

  }

输入流转Bitmap

private Bitmap getBitmapFromStream(InputStream inputStream) {

      return BitmapFactory.decodeStream(inputStream);

}

Drawable转Bitmap

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

转为Drawable

资源转Drawable

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

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。

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;

    }