android - android中位图的大小

Question

我有一张位图:

    private Bitmap bitmap;

    public newStar(Context context) {
        super(context);

    }

    @Override
    protected void onDraw(Canvas canvas) {
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.star_bez_nog);
        canvas.drawBitmap(bitmap, 100, 100, null);
    }
}

我如何更改此位图的大小并在我的 Activity 中进行绘制？

Answer 1

Use the below code::
Bitmap b = returnBitmap(mIcon_val,150,150);////where mIcon_val is bitmap to resize  


private Bitmap  returnBitmap(Bitmap mIcon_val,int width,int height){
Matrix matrix = new Matrix();   
if(width==0)
width = mIcon_val.getWidth();
if(height==0)
height = mIcon_val.getHeight();
matrix.postScale((float)width/mIcon_val.getWidth(), (float)height/mIcon_val.getHeight()); 
Bitmap resizedBitmap = Bitmap.createBitmap(mIcon_val, 0, 0, mIcon_val.getWidth(),  mIcon_val.getHeight(), matrix, true);
return resizedBitmap
}