Java 从Android中的assets文件夹读取文件的问题
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Trouble with reading file from assets folder in Android
提问by Kr?lleb?lle
This question is with regards to this one. Since it is a specific question I moved that question by itself here. I have tried creating a text file, "foo.txt", an read it into my Activity doing:
这个问题是关于这个的。由于这是一个特定的问题，因此我将这个问题移到了这里。我尝试创建一个文本文件“foo.txt”，并将其读入我的活动：
File file = new File("/assets/foo.txt");
if ( file.exists() ){
txtView.setText("Exists");
}
else{
txtView.setText("Does not exist");
}
The "foo.txt" file is located in my assets folder and I have verified that it exists in the OS. My TextView always gets the text "Does not exist" from the code above. I have tried going
“foo.txt”文件位于我的资产文件夹中，我已经验证它存在于操作系统中。我的 TextView 总是从上面的代码中获取文本“不存在”。我试过去
File file = new File("/assets/foo.txt");
Scanner in = new Scanner(file);
as well, but this produces the following inlineerror: "Unhandled exception type FileNotFoundException". Eclipse then suggest to involve try/catch, which removes the error but it doesn't work properly then either.
同样，但这会产生以下内联错误：“未处理的异常类型 FileNotFoundException”。Eclipse 然后建议使用 try/catch，这会消除错误，但它也不能正常工作。
I have also tried setting my assets folder to "Use as source folder", but this does not make any difference. I have also tried using a raw folder as several people suggests to no use. I am out of options and really need help for this one. Should be easy...
我也尝试将我的资产文件夹设置为“用作源文件夹”，但这没有任何区别。我也尝试过使用原始文件夹，因为有几个人建议没有用。我别无选择，真的需要帮助来解决这个问题。应该很容易...
Another try is to go
另一个尝试是去
AssetManager assetManager = getResources().getAssets();
InputStream is = assetManager.open("assets/foo.txt");
but this produces the inlineerror in the second line: "Unhandled exception type IOException".
但这会在第二行中产生内联错误：“未处理的异常类型 IOException”。
采纳答案by MByD
I'm with CommonsWare in that case (that's the safe side :) ), but it should be:
在这种情况下，我使用 CommonsWare（这是安全的一面:)），但它应该是：
AssetManager assetManager = getResources().getAssets();
InputStream inputStream = null;
try {
inputStream = assetManager.open("foo.txt");
if ( inputStream != null)
Log.d(TAG, "It worked!");
} catch (IOException e) {
e.printStackTrace();
}
Do not use InputStream is = assetManager.open("assets/foo.txt");
不使用 InputStream is = assetManager.open("assets/foo.txt");
回答by CommonsWare
You do not access assets/at runtime using File. You access assets/at runtime using AssetManager, which you can get via getResources().getAssets().
您不能assets/在运行时使用File. 您可以assets/在运行时使用访问AssetManager，您可以通过 获得getResources().getAssets()。
回答by ρяσ?ρ?я K
try this :
尝试这个 ：
private AssetManager am;
am=getAssets();
InputStream inputStream = null ;
try
{
inputStream = am.open("read.txt");
}
catch (IOException e) {}
