以前都是這麼用:
//轉換dip爲px
public static int convertDipOrPx(Context context, int dip) {
float scale = context.getResources().getDisplayMetrics().density;
return (int)(dip*scale + 0.5f*(dip>=0?1:-1));
}
//轉換px爲dip
public static int convertPxOrDip(Context context, int px) {
float scale = context.getResources().getDisplayMetrics().density;
return (int)(px/scale + 0.5f*(px>=0?1:-1));
}
現在可以這麼做:
//把數值轉換爲各種單位響應的數值:
//以下是轉換爲單位是DIP
int padding = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,4, getActivity().getResources().getDisplayMetrics());
關於TypedValue.applyDimension的源碼是這樣的:
public static float applyDimension(int unit, float value,
DisplayMetrics metrics)
{
switch (unit) {
case COMPLEX_UNIT_PX:
return value;
case COMPLEX_UNIT_DIP:
return value * metrics.density;
case COMPLEX_UNIT_SP:
return value * metrics.scaledDensity;
case COMPLEX_UNIT_PT:
return value * metrics.xdpi * (1.0f/72);
case COMPLEX_UNIT_IN:
return value * metrics.xdpi;
case COMPLEX_UNIT_MM:
return value * metrics.xdpi * (1.0f/25.4f);
}
return 0;
}