Android中获取屏幕分辨率、StatusBar高度、dp p

在项目中遇到了这样的需求，记录下来

/** 
 * 根据手机的分辨率从 px(像素) 的单位 转成为 dp 
 */
public int px2dip(Context context, float pxValue) {    
    final float scale = context.getResources().getDisplayMetrics().density;  
    return (int) (pxValue / scale + 0.5f); 
}

/** 
 * 根据手机的分辨率从 dp 单位 转成为 px(像素) 
 * 
 * @param dipValue
 * @return 
 */
public static int dip2px(Context context, float dipValue) {    
    final float scale = context.getResources().getDisplayMetrics().density;  
    return (int) (dipValue * scale + 0.5f);
}

/** 
 * 获取状态栏/通知栏的高度 
 * 
 * @return 
 */
private int getStatusBarHeight(Context context) {    
    Class<?> c = null;    
    Object obj = null;    
    Field field = null;    
    int x = 0, sbar = 0;    
    try {       
         c = Class.forName("com.android.internal.R$dimen");
        obj = c.newInstance();        
        field = c.getField("status_bar_height");        
        x = Integer.parseInt(field.get(obj).toString());        
        sbar = context.getResources().getDimensionPixelSize(x);   
    } catch (Exception e1) {        
            e1.printStackTrace();    
    }    
    return sbar;
}

/** 
 * 获取屏幕的宽高 
 */
private void measure(Context context) {    
    Point point = new Point();   
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);    
    //不含虚拟按键    
    windowManager.getDefaultDisplay().getSize(point);    
    //包含虚拟按键    
    //windowManager.getDefaultDisplay().getRealSize(point);    
    //屏幕宽度    
    int height = point.y;    
    //屏幕高度    
    int width = point.x;
}