今日头条屏幕适配方案

核心适配代码

/**
 * 修改density，densityDpi值-直接更改系统内部对于目标尺寸而言的像素密度
 */
public class DensityUtils {
    private static final float WIDTH = 360;//参考像素密度(dp)
    private static float appDensity;//表示屏幕密度
    private static float appScaleDensity;//字体缩放比例，默认为appDensity

    public static void setDensity(final Application application, Activity activity) {
        //获取当前屏幕信息
        DisplayMetrics displayMetrics = application.getResources().getDisplayMetrics();
        if (appDensity == 0) {
            //初始化赋值
            appDensity = displayMetrics.density;
            appScaleDensity = displayMetrics.scaledDensity;
            //监听字体变化
            application.registerComponentCallbacks(new ComponentCallbacks() {
                @Override
                public void onConfigurationChanged(Configuration newConfig) {
                    //字体发生更改，重新计算scaleDensity
                    if (newConfig != null && newConfig.fontScale > 0) {
                        appScaleDensity = application.getResources().getDisplayMetrics().scaledDensity;
                    }
                }

                @Override
                public void onLowMemory() {

                }
            });
        }
        //计算目标density scaledDensity
        float targetDensity = displayMetrics.widthPixels / WIDTH;//1080/360=3;
        float targetScaleDensity = targetDensity * (appScaleDensity / appDensity);
        int targetDensityDpi = (int) (targetDensity * 160);
        //替换Activity的值
        //px = dp * (dpi / 160)
        DisplayMetrics dm = activity.getResources().getDisplayMetrics();
        dm.density = targetDensity;  //(dpi/160) 后得到的值
        dm.scaledDensity = targetScaleDensity;
        dm.densityDpi = targetDensityDpi;  //dpi
    }
}