Utils.java
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package com.cnlive.media.utils;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Point;
import android.graphics.PointF;
import android.view.WindowManager;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import static android.content.Context.WINDOW_SERVICE;
/**
* 基础工具类，包含了单位转换等
*/
public class Utils {
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
public static Point getScreenSize(Context context) {
WindowManager wm = (WindowManager) context.getSystemService(WINDOW_SERVICE);
Point screenSize = new Point();
wm.getDefaultDisplay().getSize(screenSize);
return screenSize;
}
/**
* 弧度换算成角度
*
* @return
*/
public static double radianToDegree(double radian) {
return radian * 180 / Math.PI;
}
/**
* 角度换算成弧度
*
* @param degree
* @return
*/
public static double degreeToRadian(double degree) {
return degree * Math.PI / 180;
}
/**
* 获取变长参数最大的值
*
* @param array
* @return
*/
public static int getMaxValue(Integer... array) {
List<Integer> list = Arrays.asList(array);
Collections.sort(list);
return list.get(list.size() - 1);
}
/**
* 获取变长参数最小的值
*
* @param array
* @return
*/
public static int getMinValue(Integer... array) {
List<Integer> list = Arrays.asList(array);
Collections.sort(list);
return list.get(0);
}
/**
* 两个点之间的距离
*
* @param pf1
* @param pf1
* @return
*/
public static float distance4PointF(PointF pf1, PointF pf2) {
float disX = pf2.x - pf1.x;
float disY = pf2.y - pf1.y;
return (float) Math.sqrt(disX * disX + disY * disY);
}
public static boolean checkDeviceHasNavigationBar(Context context) {
boolean hasNavigationBar = false;
Resources rs = context.getResources();
int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");
if (id > 0) {
hasNavigationBar = rs.getBoolean(id);
}
try {
Class<?> systemPropertiesClass = Class.forName("android.os.SystemProperties");
Method m = systemPropertiesClass.getMethod("get", String.class);
String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys");
if ("1".equals(navBarOverride)) {
hasNavigationBar = false;
} else if ("0".equals(navBarOverride)) {
hasNavigationBar = true;
}
} catch (Exception e) {
e.printStackTrace();
}
return hasNavigationBar;
}
}