今日頭條最終Android屏幕適配方式（附帶demo）

1.介紹

1.android適配原理就是動態修改density，爲什麼需要修改density就不作解釋，好，話不多少直接擼代碼

2.代碼

1.先創建Density幫助類，方便修改Density

/**
 * 類說明:   Density 類
 * 作者:     zuoz
 * 日期:     2019/6/19 15:37
 */
public class Density {
    private static float appDensity;
    private static float appScaledDensity;
    private static DisplayMetrics appDisplayMetrics;
    /**
     * 用來參照的的width
     */
    private static float WIDTH;

    public static void setDensity(@NonNull final Application application, float width) {
        //獲取DisplayMetrics
        appDisplayMetrics = application.getResources().getDisplayMetrics();
        WIDTH = width;
        registerActivityLifecycleCallbacks(application);

        if (appDensity == 0) {
            //初始化的時候賦值
            appDensity = appDisplayMetrics.density;
            //字體
            appScaledDensity = appDisplayMetrics.scaledDensity;

            //添加字體變化的監聽
            application.registerComponentCallbacks(new ComponentCallbacks() {
                @Override
                public void onConfigurationChanged(Configuration newConfig) {
                    //字體改變後,將appScaledDensity重新賦值
                    if (newConfig != null && newConfig.fontScale > 0) {
                        appScaledDensity = application.getResources().getDisplayMetrics().scaledDensity;
                    }
                }

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


    private static void setDefault(Activity activity) {
        setAppOrientation(activity);
    }

    private static void setAppOrientation(@Nullable Activity activity) {

        float targetDensity = 0;
        try {
            targetDensity = appDisplayMetrics.widthPixels / WIDTH;
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }

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

        /**
         *
         * 最後在這裏將修改過後的值賦給系統參數
         *
         * 只修改Activity的density值
         */

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


    private static void registerActivityLifecycleCallbacks(Application application) {
        application.registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
                setDefault(activity);
            }

            @Override
            public void onActivityStarted(Activity activity) {
            }

            @Override
            public void onActivityResumed(Activity activity) {
            }

            @Override
            public void onActivityPaused(Activity activity) {
            }

            @Override
            public void onActivityStopped(Activity activity) {
            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
            }

            @Override
            public void onActivityDestroyed(Activity activity) {

            }
        });
    }
}

2.在創建Appliction並在onCreate中調用

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        Density.setDensity(this, 1080);
    }
}

3.結束

好了這就完成了，曬一下適配效果
demo地址
https://download.csdn.net/download/weixin_42261405/11248984