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);

Bitmap转Drawable

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;
    }