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2025-11-18 15:12:24 +08:00
parent c173c425ce
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+/*
+ *  Copyright (c) 2015 The CCP project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a Beijing Speedtong Information Technology Co.,Ltd license
+ *  that can be found in the LICENSE file in the root of the web site.
+ *
+ *   http://www.yuntongxun.com
+ *
+ *  An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */package cn.shangyu.gdxzExpert.utils;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
+import android.util.DisplayMetrics;
+import android.view.Display;
+import android.view.WindowManager;
+
+import java.lang.reflect.Method;
+
+import cn.shangyu.gdxzExpert.application.BaseApplication;
+
+/**
+ * Created by Jorstin on 2015/3/18.
+ */
+public class DensityUtil {
+
+    // 根据屏幕密度转换
+    private static float mPixels = 0.0F;
+    private static float density = -1.0F;
+
+    /**
+     *
+     * @param context
+     * @param pixels
+     * @return
+     */
+    public static int getDisplayMetrics(Context context, float pixels) {
+        if (mPixels == 0.0F)
+            mPixels = context.getResources().getDisplayMetrics().density;
+        return (int) (0.5F + pixels * mPixels);
+    }
+
+
+    public static int getImageWeidth(Context context , float pixels) {
+        LogUtil.e("screen width " + context.getResources().getDisplayMetrics().widthPixels);
+        return context.getResources().getDisplayMetrics().widthPixels - 66 - getDisplayMetrics(context, pixels);
+    }
+
+    /**
+     * 像素转化dip
+     * @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);
+
+    }
+
+    /**
+     * dip转化像素
+     * @param dipValue
+     * @return
+     */
+    public static int dip2px(float dipValue){
+        final float scale = Resources.getSystem().getDisplayMetrics().density;
+        return (int)(dipValue * scale + 0.5f);
+
+    }
+
+    /**
+     * @param context
+     * @param height
+     * @return
+     */
+    public static int getMetricsDensity(Context context , float height) {
+        DisplayMetrics localDisplayMetrics = new DisplayMetrics();
+        ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE))
+                .getDefaultDisplay().getMetrics(localDisplayMetrics);
+        return Math.round(height * localDisplayMetrics.densityDpi / 160.0F);
+    }
+
+
+    public static int fromDPToPix(Context context, int dp) {
+        return Math.round(getDensity(context) * dp);
+    }
+
+    /**
+     * @param context
+     * @return
+     */
+    public static float getDensity(Context context) {
+        if (context == null)
+            context = BaseApplication.getInstance().getApplicationContext();
+        if (density < 0.0F)
+            density = context.getResources().getDisplayMetrics().density;
+        return density;
+    }
+
+    public static int round(Context context, int paramInt) {
+        return Math.round(paramInt / getDensity(context));
+    }
+
+    /**
+     * 保持字体大小不随系统设置变化（用在界面加载之前）
+     * 要重写Activity的attachBaseContext()
+     */
+    public static Context attachBaseContext(Context context, float fontScale) {
+        Configuration config = context.getResources().getConfiguration();
+        //正确写法
+        config.fontScale = fontScale;
+        return context.createConfigurationContext(config);
+    }
+
+    /**
+     * 保持字体大小不随系统设置变化（用在界面加载之前）
+     * 要重写Activity的getResources()
+     */
+    public static Resources getResources(Context context, Resources resources, float fontScale) {
+        Configuration config = resources.getConfiguration();
+        if(config.fontScale != fontScale) {
+            config.fontScale = fontScale;
+            return context.createConfigurationContext(config).getResources();
+        } else {
+            return resources;
+        }
+    }
+
+    /**
+     * 保存字体大小，后通知界面重建，它会触发attachBaseContext，来改变字号
+     */
+    public static void recreate(Activity activity) {
+        activity.recreate();
+    }
+
+
+        /**
+         * 系统设置"显示大小"时原有UI样式保持不变：
+         * <p>
+         * 1、当调节手机系统"显示大小"【调大】的时候，相应的dpi会变大【dp = (dpi/160) * px】,此时dp就会变大，所以相应的UI布局就会变大。
+         * 2、当调节手机系统"分辨率"【调小】的时候，相应的dpi会变小【比如由480-->320】。如果此时使用技术手段使dpi保持不变，那么相同的dp就会占用更多的px，所以UI布局就会变大。
+         *
+         * @param context
+         */
+        public static void setDefaultDisplay(Context context) {
+            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
+                Configuration origConfig = context.getResources().getConfiguration();
+                //获取手机出厂时默认的densityDpi【注释1】
+                origConfig.densityDpi = getDefaultDisplayDensity();
+
+                context.getResources().updateConfiguration(origConfig, context.getResources().getDisplayMetrics());
+            }
+        }
+
+        public static int getDefaultDisplayDensity() {
+            try {
+                Class clazz = Class.forName("android.view.WindowManagerGlobal");
+                Method method = clazz.getMethod("getWindowManagerService");
+                method.setAccessible(true);
+                Object iwm = method.invoke(clazz);
+                Method getInitialDisplayDensity = iwm.getClass().getMethod("getInitialDisplayDensity", int.class);
+                getInitialDisplayDensity.setAccessible(true);
+                Object densityDpi = getInitialDisplayDensity.invoke(iwm, Display.DEFAULT_DISPLAY);
+                return (int) densityDpi;
+            } catch (Exception e) {
+                e.printStackTrace();
+                return -1;
+            }
+        }
+
+
+
+}