java多線程編程之應用Synchronized症結字同步類辦法

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Android中處置圖象是一件很罕見的工作，這裡記載備忘一些親自應用過的處置圖片數據的辦法。

轉為Bitmap

RGB值轉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值轉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);

字節數組轉Bitmap

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

讀取文件轉Bitmap

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

讀取資本轉Bitmap

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

輸出流轉Bitmap

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

Drawable轉Bitmap

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

轉為Drawable

資本轉Drawable

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

Bitmap轉Drawable

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

圖片圓角展現

經由過程對圖片數據bitmap停止處置便可，個中pixels為邊角的半徑。

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;
    }