技巧：开发SDK不通过宿主传ApplicationContent

通过自定义ContentProvider获取
1.声明

 <application>
        <provider
            android:name="me.jessyan.autosize.InitProvider"
            android:authorities="${applicationId}.autosize-init-provider"
            android:exported="false"
            android:multiprocess="true"/>
    </application>

2.创建Provider

public class InitProvider extends ContentProvider {
    @Override
    public boolean onCreate() {
        Context application = getContext().getApplicationContext();
        if (application == null) {
            application = AutoSizeUtils.getApplicationByReflect();
        }
        AutoSizeConfig.getInstance()
                .setLog(true)
                .init((Application) application)
                .setUseDeviceSize(false);
        return true;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        return null;
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return 0;
    }
}

   public static Application getApplicationByReflect() {
        try {
            @SuppressLint("PrivateApi")
            Class<?> activityThread = Class.forName("android.app.ActivityThread");
            //currentActivityThread是静态方法所以不需要传对象
            Object thread = activityThread.getMethod("currentActivityThread").invoke(null);
            //getApplication是对象方法所以需要传对象
            Object app = activityThread.getMethod("getApplication").invoke(thread);
            if (app == null) {
                throw new NullPointerException("you should init first");
            }
            return (Application) app;
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        throw new NullPointerException("you should init first");
    }