从android中的assets文件夹中打开文件
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Opening a File from assets folder in android
提问by Mina Samy
I have a .gif file inside the assets folder like this assets/Files/android.gif. when I try to open the file it throws an exception at the second line
我在资产文件夹中有一个 .gif 文件，如资产/文件/android.gif。当我尝试打开文件时，它在第二行抛出异常
AssetManager mngr=getAssets();
InputStream is2=mngr.open("Files/android.gif");
so Is it that I'm trying to open an image file despite that the same code works if I try to open a text file ? what can be the problem here.
所以我是否试图打开一个图像文件，尽管如果我尝试打开一个文本文件，同样的代码可以工作？这可能是什么问题。
回答by Tofeeq Ahmad
These Lines are working perfectly--
这些线路运行良好--
InputStream assetInStream=null;
try {
assetInStream=getAssets().open("icon.png");
Bitmap bit=BitmapFactory.decodeStream(assetInStream);
img.setImageBitmap(bit);
} catch (IOException e) {
e.printStackTrace();
} finally {
if(assetInStream!=null)
assetInStream.close();
}
If your image is very big then you should scale your image before decoding it into Bitmap. See How to display large image efficiently
如果您的图像非常大，那么您应该先缩放图像，然后再将其解码为位图。请参阅如何有效地显示大图像
回答by keno
I suspect you are getting complaints about unhandled exception type IOException. If that's the case, you need to put the call to mgr.open in a try-catch block to handle the exception that may occur when retrieving the InputStream object.
我怀疑您收到有关未处理的异常类型 IOException 的投诉。如果是这种情况，您需要在 try-catch 块中调用 mgr.open 以处理检索 InputStream 对象时可能发生的异常。
AssetManager mngr = getAssets();
try {
InputStream is2 = mngr.open("Files/android.gif");
} catch (final IOException e) {
e.printStackTrace();
}
回答by JRL
Don't know if things have changed or not but I had an app in Android 1.1 that opened icons to then display them in a view and I did it like so:
不知道事情是否发生了变化，但我在 Android 1.1 中有一个应用程序可以打开图标然后在视图中显示它们，我是这样做的：
BufferedInputStream buf = new BufferedInputStream(mContext.openFileInput(value));
Bitmap bitmap = BitmapFactory.decodeStream(buf);
回答by AdamC
I believe the preferred way to do this is to put your image in the res/drawable directory. Then you can get a Drawable like this:
我相信这样做的首选方法是将您的图像放在 res/drawable 目录中。然后你可以得到一个这样的 Drawable：
Drawable d = Resources.getSystem().getDrawable(R.drawable.android);
回答by Someone Somewhere
Mina, I had the same problem... I had images and an XML file within "assets" and I could read the XML file but not the images. After a couple of hours of frustration I finally found the solution !
Mina，我遇到了同样的问题......我在“资产”中有图像和一个 XML 文件，我可以读取 XML 文件但不能读取图像。经过几个小时的挫折，我终于找到了解决方案！
I have posted the solution here: Null-pointer issue displaying an image from assets folder Android 2.2 SDK
我在这里发布了解决方案： Null-pointer issue shows an image from assets folder Android 2.2 SDK
回答by Adam Freeman
I do not believe gif is supported automatically on Android. Try a png or jpg with the same code.
我不相信 gif 在 Android 上自动支持。尝试使用相同代码的 png 或 jpg。
