android开发，灵活根据手机屏幕密度，设置x dip的效果

具体通过使用

/** * Converts an unpacked complex data value holding a dimension to its final floating * point value.

The two parameters unit and value * are as in {

@link #TYPE_DIMENSION}. * * 

@param unit The unit to convert from. * 

@param value The value to apply the unit to. *

@param metrics Current display metrics to use in the conversion -- * supplies display density and scaling information. * *

@return The complex floating point value multiplied by the appropriate * metrics depending on its unit. */

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; }

方法，可以在代码中设置x dip的效果。