安卓屏幕适配

https://www.jianshu.com/p/4254ea9d1b27

private static float appDensity;
private static float appScaledDensity;
private static DisplayMetrics appDisplayMetrics;
private static int barHeight;

public static void setDensity(@NonNull Application application) {
   //获取application的DisplayMetrics
   appDisplayMetrics = application.getResources().getDisplayMetrics();
   //获取状态栏高度
   barHeight = AppUtils.getStatusBarHeight(application);

    if (appDensity == 0) {
        //初始化的时候赋值
        appDensity = appDisplayMetrics.density;
        appScaledDensity = appDisplayMetrics.scaledDensity;

        //添加字体变化的监听
        application.registerComponentCallbacks(new ComponentCallbacks() {
            @Override
            public void onConfigurationChanged(Configuration newConfig) {
                //字体改变后,将appScaledDensity重新赋值
                if (newConfig != null && newConfig.fontScale > 0) {
                    appScaledDensity = application.getResources().getDisplayMetrics().scaledDensity;
                }
            }

            @Override
            public void onLowMemory() {
            }
        });
    }

    //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)
    public static void setDefault(Activity activity) {
        setAppOrientation(activity, AppUtils.WIDTH);
    }

    //此方法用于在某一个Activity里面更改适配的方向
    public static void setOrientation(Activity activity, String orientation) {
        setAppOrientation(activity, orientation);
    }

    /**
     * targetDensity
     * targetScaledDensity
     * targetDensityDpi
     * 这三个参数是统一修改过后的值
     * <p>
     * orientation:方向值,传入width或height
     */
    private static void setAppOrientation(@Nullable Activity activity, String orientation) {

        float targetDensity;

        if (orientation.equals("height")) {
            targetDensity = (appDisplayMetrics.heightPixels - barHeight) / 667f;
        } else {
            targetDensity = appDisplayMetrics.widthPixels / 360f;
        }

        float targetScaledDensity = targetDensity * (appScaledDensity / appDensity);
        int targetDensityDpi = (int) (160 * targetDensity);

        /**
         *
         * 最后在这里将修改过后的值赋给系统参数
         *
         * 只修改Activity的density值
         */

        DisplayMetrics activityDisplayMetrics = activity.getResources().getDisplayMetrics();
        activityDisplayMetrics.density = targetDensity;
        activityDisplayMetrics.scaledDensity = targetScaledDensity;
        activityDisplayMetrics.densityDpi = targetDensityDpi;
    }
}