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
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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);
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Color值转Bitmap
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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);
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字节数组转Bitmap
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private Bitmap getBitmapFromByteArray(byte[] array) {
return BitmapFactory.decodeByteArray(array, 0, array.length);
}
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读取文件转Bitmap
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private Bitmap getBitmapFromFile(String pathName) {
return BitmapFactory.decodeFile(pathName);
}
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读取资源转Bitmap
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private Bitmap getBitmapFromResource(Resources res, int resId) {
return BitmapFactory.decodeResource(res, resId);
}
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输入流转Bitmap
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private Bitmap getBitmapFromStream(InputStream inputStream) {
return BitmapFactory.decodeStream(inputStream);
}
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Drawable转Bitmap
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Bitmap icon = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_resource);
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转为Drawable
资源转Drawable
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Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);
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Bitmap转Drawable
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Drawable d = new BitmapDrawable(getResources(),bitmap);
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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。
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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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