android Drawable 缩放

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.Drawable;

public class FunctionUtil {

/*********************图形缩放**************************/
public static Bitmap imageScale(Bitmap bitmap, int dst_w, int dst_h){

int src_w = bitmap.getWidth();
int src_h = bitmap.getHeight();
floatscale_w = ((float)dst_w)/src_w;
float scale_h = ((float)dst_h)/src_h;
Matrix matrix = new Matrix();
matrix.postScale(scale_w, scale_h);
Bitmap dstbmp = Bitmap.createBitmap(bitmap, 0, 0, src_w, src_h, matrix, true);

return dstbmp;
}

/*********************Drawable转Bitmap************************/
public static Bitmap drawabletoBitmap(Drawable drawable){

intwidth = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicWidth();

Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ?
Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);

drawable.draw(canvas);

return bitmap;
}

/***************************图片圆角处理********************************/
public static Bitmap getRCB(Bitmap bitmap, float roundPX)//RCB means Rounded Corner Bitmap
{
Bitmap dstbmp = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(dstbmp);

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);
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 dstbmp;
}
}

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