android 图片倒影 bitmap与drawable的转换 把图片处理成指定大小 图片圆角处理 dip转换成px

//图片倒影处理
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
final int reflectionGap = 0;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false);
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 4), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(bitmap, 0, 0, null);
Paint deafalutPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap , null);
Paint paint = new Paint();
//创建线性渐变LinearGradient对象
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()+ reflectionGap, paint);
return bitmapWithReflection;
}

//drawable转换成bitmap类型public static Bitmap drawableToBitmap(Drawable drawable) {Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);Canvas canvas = new Canvas(bitmap);// canvas.setBitmap(bitmap);drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());drawable.draw(canvas);return bitmap;}

//图片缩放成指定的大小 csj start    private static Bitmap zoomDrawable(Drawable drawable, int w, int h) {        int width = drawable.getIntrinsicWidth();        int height = drawable.getIntrinsicHeight();        Bitmap oldbmp = drawableToBitmap(drawable);        Matrix matrix = new Matrix();        float scaleWidth = ((float) w / width);        float scaleHeight = ((float) h / height);        matrix.postScale(scaleWidth, scaleHeight);        Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,matrix, true);        newbmp = getRCB(newbmp, 20f);        return newbmp;    }

//图片圆角处理
public static Bitmap getRCB(Bitmap bitmap, float roundPX) {
Bitmap dstbmp = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(dstbmp);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(0xff424242);
canvas.drawRoundRect(rectF, roundPX, roundPX, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return dstbmp;
}

//dip转换成px
private int dip2px(Context context, float dipValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}