java - 为什么位图大小在不同的屏幕上会发生变化？

Question

我使用这种方法将文本转换为位图:

 private Bitmap textToBitmap(String text)
{
    Bitmap myBitmap = Bitmap.createBitmap(400, 50, Bitmap.Config.ARGB_4444);
    Canvas myCanvas = new Canvas(myBitmap);
    Paint paint = new Paint();
    Typeface clock = Typeface.createFromAsset(context.getAssets(),"fonts/myfont.ttf");
    paint.setAntiAlias(true);
    paint.setSubpixelText(true);
    paint.setTypeface(clock);
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.WHITE  );
    paint.setTextSize(38);
    paint.setTextAlign(Paint.Align.RIGHT);
    myCanvas.drawText(text, 400, 30, paint);
    return myBitmap;
}

但在某些手机中，我的位图非常小，而在其他手机中，它非常大为什么会这样？

Answer 1

Bitmap myBitmap = Bitmap.createBitmap(400, 50, Bitmap.Config.ARGB_4444);//its unit is px, practical size of 1 px is different in various device.

您应该根据设备调整位图大小scaledDensity , 这里是 a good solution