在画布上绘制位图时出现质量不佳

Question

我正在尝试使用此代码绘制头像位图。但是位图是像素化的。这是我的代码。目前我使用createScaledBitmap来调整头像图片的大小。此外，文字在高分辨率的某些设备上稍小一些

BitmapFactory.Options opt = new BitmapFactory.Options(); 
     opt.inMutable = true; 

    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), 
      R.drawable.card_nodpi, opt) ; 

Canvas canvas = new Canvas(bitmap); 

    Paint paint = new Paint(); 
    paint.setColor(Color.BLACK); 
    paint.setTextSize(40); 
    paint.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.BOLD)); 
    canvas.drawText("The quick brown fox", x, y, paint); 

    Paint paint2 = new Paint(); 
    paint2.setColor(Color.BLACK); 
    paint2.setTextSize(30); 


    canvas.drawText("The quick brown fox", x, y + (40), paint2); 
    canvas.drawText("The quick brown fox", x, y + ((40 * 2)), paint2); 

    if (avatar != null) { 
     Bitmap img = Bitmap.createScaledBitmap(avatar, 250, 250, false); 
     canvas.drawBitmap(img, bitmap.getWidth() - img.getWidth() - x, y - 40, new Paint(Paint.FILTER_BITMAP_FLAG)); 
    } 

imageView.setImageBitmap(bitmap); 

Answer 1

createScaledBitmap可能会产生一些质朴/质量差的图像。 试试这里的解决方案： https://stackoverflow.com/a/7468636/4557530

让我知道，如果这对你做任何事情！

另外， 试试这个，我用这个代码感谢一些博客，我不记得了

Bitmap newBM = Bitmap.createBitmap(newWidth, newHeight, Config.ARGB_8888); 

    float scaleX = newWidth/(float) origBM.getWidth(); 
    float scaleY = newHeight/(float) origBM.getHeight(); 
    float pivX = 0; 
    float pivY = 0; 

    Matrix scaleMatrix = new Matrix(); 
    scaleMatrix.setScale(scaleX, scaleY, pivotX, pivotY); 

    Canvas canvas = new Canvas(newBM); 
    canvas.setMatrix(scaleMatrix); 
    canvas.drawBitmap(origBM, 0, 0, new Paint(Paint.FILTER_BITMAP_FLAG));