import android.app.Application;
import android.content.ComponentCallbacks;
import android.content.res.Configuration;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.DisplayMetrics;

public class LayoutAdaption {

    private static float sNonCompatDensity;
    private static float sNonCompatScaledDensity;

    public static void setCustomDensity(@NonNull AppCompatActivity activity, @NonNull final Application application) {
        DisplayMetrics metrics = application.getResources().getDisplayMetrics();

        if(0 == sNonCompatDensity) {
            sNonCompatDensity = metrics.density;
            sNonCompatScaledDensity = metrics.scaledDensity;
            application.registerComponentCallbacks(new ComponentCallbacks() {
                @Override
                public void onConfigurationChanged(Configuration newConfig) {
                    if(null != newConfig && newConfig.fontScale > 0) {
                        sNonCompatScaledDensity = application.getResources().getDisplayMetrics().scaledDensity;
                    }
                }

                @Override
                public void onLowMemory() {

                }
            });
        }

        final float targetDensity = metrics.widthPixels / 750f;
        final float targetScaledDensity = targetDensity * (sNonCompatScaledDensity / sNonCompatDensity);
        final int targetDensityDpi = (int) (160 * targetDensity);

        metrics.density = targetDensity;
        metrics.scaledDensity = targetScaledDensity;
        metrics.densityDpi = targetDensityDpi;

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

原文地址 https://mp.weixin.qq.com/s/d9QCoBP6kV9VSWvVldVVwA