在畫布上繪製位圖時出現質量不佳

Question

我正在嘗試使用此代碼繪製頭像位圖。但是位圖是像素化的。這是我的代碼。目前我使用createScaledBitmap來調整頭像圖片的大小。此外，文字在高分辨率的某些設備上稍小一些

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可能會產生一些質樸/質量差的圖像。 試試這裏的解決方案： https://stackoverflow.com/a/7468636/4557530

讓我知道，如果這對你做任何事情！

另外， 試試這個，我用這個代碼感謝一些博客，我不記得了

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));