获取绘制的密度API级别＆LT; 15 [英] Get drawable for density for API Level <15

问题描述

由于Android的API 15级就有<一个href="http://developer.android.com/reference/android/content/res/Resources.html#getDrawableForDensity%28int,%20int%29">method 市民可绘制getDrawableForDensity（INT ID，INT密度）来检索特定的屏幕密度的绘制对象。有没有办法做到这一点之前，API等级15？

Since Android API Level 15 there is the method public Drawable getDrawableForDensity (int id, int density) to retrieve a drawable object for a specific screen density. Is there any way to do this prior to API Level 15?

推荐答案

所以，其实我觉得它可能采用Android的API逆向工程和源 - code按@ adtennant的建议得到解决。我开始写的解决方案，但在这一过程中进入了死胡同作为底层的本机（非Java）API，它需要的是更高版本的Andr​​oid无法使用。

So I actually thought it could be resolved using reverse-engineering of Android APIs and the source-code as per @adtennant's suggestion. I started writing the solution it, but in the process hit a dead end as an underlying native (non-Java) API that is necessary is unavailable in later versions of Android.

如果你是没事制约这只是位图，所暗示您的评论，就可以与BitmapFactory做到这一点的建议。 BitmapFactory有另一种方法：

If you are okay constraining this to just Bitmaps, as implied by your comment, it is possible to do this with BitmapFactory as suggested. BitmapFactory has another method:

<一个href="http://developer.android.com/reference/android/graphics/BitmapFactory.html#de$c$cResource%28android.content.res.Resources,%20int,%20android.graphics.BitmapFactory.Options%29"相对=nofollow>德codeResource（资源RES，INT ID，BitmapFactory.Options选择采用）

此方法接受额外的<一个href="http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inTargetDensity"相对=nofollow> BitmapFactory.Options ，这将允许你指定装载密度。这似乎是因为API级别1。具体到已经存在的，我相信你可以使用：

This method accepts the additional BitmapFactory.Options which will allow you to specify the density to load. This appears to have existed since API level 1. Specifically, I believe that you can use:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inDensity = DisplayMetrics.DENSITY_MEDIUM; // whichever you want to load
options.inTargetDensity = getResources().getDisplayMetrics().densityDpi;
options.inScaled = true;

这也将它扩展到了屏幕像素密度，如果加载了不匹配的密度。

This will also scale it to the screen density if a mismatched density is loaded.

这篇关于获取绘制的密度API级别＆LT; 15的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！