NullPointerException异常试图访问一个字符串资源 [英] NullPointerException trying to access a String resource

问题描述

我有以下/res/values​​/uris.xml

I have the following /res/values/uris.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="bladder">blahblah</string>
</resources>

我访问它在code：

I am accessing it in code:

private String bladderUrl= getString(R.string.bladder);

但它返回null。我不知道为什么？

But it is returning null. I'm not sure why?

推荐答案

我猜你放在水木清华bladderUrl这样的：

My guess you placed bladderUrl smth like this:

public class YourActivity extends Activity {
    private String bladderUrl = getString(R.string.bladder);

    @Override
    public void onCreate(Bundle savedInstanceState) {

...

不过你需要做的水木清华这样的：

However you need to do smth like this:

public class YourActivity extends Activity {
    private String bladderUrl;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        bladderUrl = getString(R.string.bladder);
...

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