[英]Cannot make a static reference to a non-static method
I'm trying to call 4 methods to use as arguments in another. 我试图调用4个方法作为另一个方法的参数。 I'm getting a "Cannot make a static reference to a non-static method" error.
我得到一个“无法对非静态方法进行静态引用”错误。 My problem is that I understand why my methods aren't already static.
我的问题是我理解为什么我的方法不是静态的。
Origin class: 起源类:
public class IotdHandler extends DefaultHandler {
private String url = "http://www.nasa.gov/rss/image_of_the_day.rss";
private boolean inUrl = false;
private boolean inTitle = false;
private boolean inDescription = false;
private boolean inItem = false;
private boolean inDate = false;
private Bitmap image = null;
private String title = null;
private StringBuffer description = new StringBuffer();
private String date = null;
public void processFeed() {
try {
SAXParserFactory factory =
SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader reader = parser.getXMLReader();
reader.setContentHandler(this);
InputStream inputStream = new URL(url).openStream();
reader.parse(new InputSource(inputStream));
} catch (Exception e)
{ }
}
private Bitmap getBitmap(String url) {
try {
HttpURLConnection connection =
(HttpURLConnection)new URL(url).openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(input);
input.close();
return bitmap;
} catch (IOException ioe) { return null; }
}
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if (localName.equals("url")) { inUrl = true; }
else { inUrl = false; }
if (localName.startsWith("item")) { inItem = true; }
else if (inItem) {
if (localName.equals("title")) { inTitle = true; }
else { inTitle = false; }
if (localName.equals("description")) { inDescription = true; }
else { inDescription = false; }
if (localName.equals("pubDate")) { inDate = true; }
else { inDate = false; }
}
}
public void characters(char ch[], int start, int length) {
String chars = new String(ch).substring(start, start + length);
if (inUrl && url == null) { image = getBitmap(chars); }
if (inTitle && title == null) { title = chars; }
if (inDescription) { description.append(chars); }
if (inDate && date == null) { date = chars; }
}
public Bitmap getImage() { return image; }
public String getTitle() { return title; }
public StringBuffer getDescription() { return description; }
public String getDate() { return date; }
}
calling method: 调用方法:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_daily_image);
IotdHandler handler = new IotdHandler();
handler.processFeed();
resetDisplay(IotdHandler.getTitle(), IotdHandler.getDate(),
IotdHandler.getImage(), IotdHandler.getDescription());
}
Use handler
instead of IotdHandler
for accessing non-static methods from IotdHandler
class same as you are accessing processFeed()
method from IotdHandler.: 使用
handler
而不是IotdHandler
从IotdHandler
类访问非静态方法, IotdHandler
从IotdHandler
访问processFeed()
方法一样:
resetDisplay(handler.getTitle(), handler.getDate(),
handler.getImage(), handler.getDescription());
You have to call. 你必须打电话。
resetDisplay(handler.getTitle(), handler.getDate(),
handler.getImage(), handler.getDescription());
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