Android單位轉換類 DensityUtils

 import android.content.Context;

import android.util.TypedValue;

/**

常用單位轉換的輔助類 


*/

public class DensityUtils

{

private DensityUtils()

{

/* cannot be instantiated */  
throw new UnsupportedOperationException("cannot be instantiated");  

}
/**

dp轉px 

@param context 
@param val 
@return 
*/

public static int dp2px(Context context, float dpVal)

{

 return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,  
     dpVal, context.getResources().getDisplayMetrics());  

}  

/**

sp轉px 

@param context 
@param val 
@return 
*/

public static int sp2px(Context context, float spVal)

{

 return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,  
     spVal, context.getResources().getDisplayMetrics());  

}  

/**

px轉dp 

@param context 
@param pxVal 
@return 
*/

public static float px2dp(Context context, float pxVal)

{

 final float scale = context.getResources().getDisplayMetrics().density;

 return (pxVal / scale);

}  

/**

px轉sp 

@param fontScale 
@param pxVal 
@return 
*/

public static float px2sp(Context context, float pxVal)

{

 return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);

}  



}  </pre>