Java 从字符串值设置 Android 图像
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Setting Android images from string value
提问by ingh.am
Currently I'm drawing a PNG image in my Android application like so:
目前我正在我的 Android 应用程序中绘制一个 PNG 图像，如下所示：
ImageView image = new ImageView(context);
image.setImageDrawable(context.getResources().getDrawable(R.drawable.testimage))
If I have a list of image names in a database, is there a way to set the drawable above using the image name? I already have the code to go through the database, I'm just looking to draw the image based on the value taken from here.
如果我在数据库中有一个图像名称列表，有没有办法使用图像名称设置上面的可绘制对象？我已经有了通过数据库的代码，我只是想根据从这里获取的值来绘制图像。
For example, a record for the DB:
例如，数据库的一条记录：
ID: Name: ImageName:
- Test testimage
So when I'm reading this record, I have a string with the value of "testimage" and I'd then want to set the image drawable to R.drawable.testimage.
因此，当我阅读此记录时，我有一个值为“testimage”的字符串，然后我想将可绘制的图像设置为R.drawable.testimage.
One way I was thinking of doing it would be something like this:
我想这样做的一种方式是这样的：
int image = R.drawable.blank; // blank image
// testimage.png is the image name from the database
if(imageName.toString().equals("testimage.png"))
image = R.drawable.testimage;
else if(imageName.toString().equals("another.png"))
image = R.drawable.another;
else if(imageName.toString().equals("etc.png"))
image = R.drawable.etc;
However this isn't very efficient!
然而，这不是很有效！
Thanks
谢谢
采纳答案by GeekYouUp
There is a method for doing that, you can retreive resource IDs by string using Resources.getIdentifier() http://developer.android.com/reference/android/content/res/Resources.html
有一种方法可以做到这一点，您可以使用 Resources.getIdentifier() http://developer.android.com/reference/android/content/res/Resources.html通过字符串检索资源 ID
Something like:
就像是：
int resourceId = Activity.getResources().getIdentifier("testimage", "drawable", "your.package.name");
回答by Erik S
I'm using:
我正在使用：
int resId = getResources().getIdentifier("testimage", "drawable", getPackageName());
image.setImageResource(resId);
"testimage" - corresponds to for instance testimage.jpg, i.e. dont include ".jpg"
“testimage” - 对应于例如 testimage.jpg，即不包含“.jpg”
"drawable" - is the resource type, like in: @drawable/testimage
"drawable" - 是资源类型，如：@drawable/testimage
回答by Mikpa
Put you images in the assets/ folder and open
将您的图像放在 assets/ 文件夹中并打开
image.setImageURI("file:///android_asset/" + nameFromDB);
回答by Mudasar
String path = "sdcard/camera_app/name.jpg"; img.setImageDrawable(Drawable.createFromPath(path));
String path = "sdcard/camera_app/name.jpg"; img.setImageDrawable(Drawable.createFromPath(path));
