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@@ -0,0 +1,119 @@
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+package com.yingyangfly.baselib.utils;
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+
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+import android.app.Activity;
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+import android.app.Application;
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+import android.content.ComponentCallbacks;
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+import android.content.res.Configuration;
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+import android.util.DisplayMetrics;
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+
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+import androidx.annotation.NonNull;
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+import androidx.annotation.Nullable;
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+
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+import java.text.DecimalFormat;
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+
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+/**
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+ * author: 王可可
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+ * Created on 2018/6/29.
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+ * description: 摇摇摆摆又是一年
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+ * <p>
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+ * <p>
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+ * 个人理解：拿到设计图后，尺寸除以2，xml指定测量后的值/2，单位为dp，如果使用原图，字体scaleDensity*2
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+ * 宽高只能以某个为适配基准，要么以宽为基准，要么以高为基准。
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+ * <p>
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+ * <p>
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+ * 比如：UI给的效果图为：1334*750，宽高除以2后为667，375，在setAppOrientation方法里设置宽高值667，375，
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+ * 在xml里通过markman测量的大小除以2，然后以dp为单位写死即可。
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+ */
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+public class DensityUtils {
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+
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+ private static float appDensity;
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+ private static float appScaledDensity;
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+ private static DisplayMetrics appDisplayMetrics;
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+
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+ public static void setDensity(@NonNull final Application application) {
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+ //获取application的DisplayMetrics
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+ appDisplayMetrics = application.getResources().getDisplayMetrics();
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+ if (appDensity == 0) {
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+ //初始化的时候赋值
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+ appDensity = appDisplayMetrics.density;
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+ appScaledDensity = appDisplayMetrics.scaledDensity;
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+ //添加字体变化的监听
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+ application.registerComponentCallbacks(new ComponentCallbacks() {
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+ @Override
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+ public void onConfigurationChanged(Configuration newConfig) {
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+ //字体改变后,将appScaledDensity重新赋值
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+ if (newConfig != null && newConfig.fontScale > 0) {
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+ appScaledDensity = application.getResources().getDisplayMetrics().scaledDensity;
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+ }
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+ }
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+
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+ @Override
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+ public void onLowMemory() {
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+ }
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+ });
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+ }
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+ }
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+
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+ //此方法在BaseActivity中做初始化(如果不封装BaseActivity的话,直接用下面那个方法就好了)
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+ public static void setDefault(Activity activity) {
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+ setAppOrientation(activity, AppUtils.WIDTH);
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+ }
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+
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+ //此方法用于在某一个Activity里面更改适配的方向
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+ public static void setOrientation(Activity activity, String orientation) {
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+ setAppOrientation(activity, orientation);
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+ }
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+
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+ /**
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+ * targetDensity
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+ * targetScaledDensity
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+ * targetDensityDpi
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+ * 这三个参数是统一修改过后的值
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+ * <p>
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+ * orientation:方向值,传入width或height
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+ */
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+ private static void setAppOrientation(@Nullable Activity activity, String orientation) {
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+ float targetDensity = 0;
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+ try {
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+ Double division;
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+ //根据带入参数选择不同的适配方向
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+ if (orientation.equals("height")) {
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+ division = division(appDisplayMetrics.heightPixels, 598);
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+ } else {
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+ division = division(appDisplayMetrics.widthPixels, 417);
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+ }
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+ //由于手机的长宽不尽相同,肯定会有除不尽的情况,有失精度,所以在这里把所得结果做了一个保留两位小数的操作
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+ DecimalFormat df = new DecimalFormat("0.00");
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+ String s = df.format(division);
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+ targetDensity = Float.parseFloat(s);
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+ } catch (NumberFormatException e) {
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+ e.printStackTrace();
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+ }
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+
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+ float targetScaledDensity = targetDensity * (appScaledDensity / appDensity);
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+ int targetDensityDpi = (int) (160 * targetDensity);
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+
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+ /**
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+ *
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+ * 最后在这里将修改过后的值赋给系统参数
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+ *
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+ * 只修改Activity的density值
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+ */
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+
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+ DisplayMetrics activityDisplayMetrics = activity.getResources().getDisplayMetrics();
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+ activityDisplayMetrics.density = targetDensity;
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+ activityDisplayMetrics.scaledDensity = targetScaledDensity;
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+ activityDisplayMetrics.densityDpi = targetDensityDpi;
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+ }
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+
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+ //除法
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+ public static final Double division(double a, double b) {
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+ double div = 0;
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+ if (b != 0) {
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+ div = a / b;
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+ } else {
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+ div = 0;
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+ }
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+ return div;
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+ }
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+}
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王鹏鹏