获取屏幕宽高,和dp,px,sp的转化工具类

在项目适配中我们经常会用到dp装px来适应屏幕,还有就是在我们自定义View中的绘画也需要适配.

代码如下:

import java.lang.reflect.Field;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.WindowManager;

/**
* 屏幕尺寸, 像素 ,
* @author Administrator
*
*/
public final class ScreenUtil {

/**
* dp 转 px
* @param context
* @param dipValue
* @return
*/
public static int dip2px(Context context, float dipValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}

/**
* px 转 dp
* @param context
* @param pxValue
* @return
*/
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}

/**
* px 转 sp
*
* @param pxValue
* @return
*/
public static int px2sp(Context context, float pxValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (pxValue / fontScale + 0.5f);
}

/**
* sp 转 px
*
* @param spValue
* @return
*/
public static int sp2px(Context context, float spValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}

@SuppressWarnings("deprecation")
public static int getWindowsW(Context context) {
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
return wm.getDefaultDisplay().getWidth();
}

public static float getScreenDensity(Activity context) {
DisplayMetrics dm = new DisplayMetrics();

context.getWindowManager().getDefaultDisplay().getMetrics(dm);

return dm.density;

}

@SuppressWarnings("deprecation")
public static int getWindowsH(Context context) {
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
return wm.getDefaultDisplay().getHeight();
}

/**
* 获取状态栏高度
* @param context
* @return
*/
public static int getStatusHeight(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) {
Log.e("ScreenUtil", "get status bar height fail");
e1.printStackTrace();
}
Log.i("status_height", "" + sbar);
return sbar;
}

public static boolean isRunningForeground(Context context) {
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
return context.getPackageName().equals(
am.getRunningTasks(1).get(0).topActivity.getPackageName());
}
}