Question

这些是使用类似于How to modify dummy content in android master/detail activity?的Android Studio创建的。我将dummyContent下的静态方法改为：

</body>

虽然上面通过了测试：

public void fetchData() {
    // Add some sample items.
    for (int i = 1; i <= COUNT; i++) {
        addItem(createDummyItem(i));
    }

    Authenticator.setDefault(new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(
                    DummyContent.UNAME, DummyContent.PASSWORD.toCharArray());
        }
    });

    try {
        DummyContentRegistry registry = new XMLDummyContentParser(DummyContent.url).parse();
        for (DummyContent.DummyItem t: registry.getTeachers()) {
            DummyContent.addItem(t);
        }
    } catch (Exception e) {
        fail("Exception should not have been thrown");
    }
}

然而，当我在MainActivity.onCreate下调用该方法时，它失败了“不应该抛出异常”。为什么？这是一个未通过电话的例子

public class DummyContentRegistryTest {
    @Before
    public void buildRegistry() {}

    @Test
    public void testFetchData() {
        Assert.assertEquals(0,DummyContent.ITEMS.size());
        new DummyContent().fetchData();
        Assert.assertEquals(27,DummyContent.ITEMS.size());// two more items are added through parsing xml on a website
    }

}

我不知道问题是否与calling non-static method in static method in Java相似，但我显然已经尝试过大多数人同意的方式。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (DummyContent.ITEMS.isEmpty()) {
        new DummyContent().fetchData();
    }
......
}

Answer 1

您捕获的异常Function FTPUpload(sSite, sUsername, sPassword, sLocalFile, sRemotePath) 'This script is provided under the Creative Commons license located 'at http://creativecommons.org/licenses/by-nc/2.5/ . It may not 'be used for commercial purposes with out the expressed written consent 'of NateRice.com Const OpenAsDefault = -2 Const FailIfNotExist = 0 Const ForReading = 1 Const ForWriting = 2 Set oFTPScriptFSO = CreateObject("Scripting.FileSystemObject") Set oFTPScriptShell = CreateObject("WScript.Shell") sRemotePath = Trim(sRemotePath) sLocalFile = Trim(sLocalFile) '----------Path Checks--------- 'Here we willcheck the path, if it contains 'spaces then we need to add quotes to ensure 'it parses correctly. If InStr(sRemotePath, " ") > 0 Then If Left(sRemotePath, 1) <> """" And Right(sRemotePath, 1) <> """" Then sRemotePath = """" & sRemotePath & """" End If End If If InStr(sLocalFile, " ") > 0 Then If Left(sLocalFile, 1) <> """" And Right(sLocalFile, 1) <> """" Then sLocalFile = """" & sLocalFile & """" End If End If 'Check to ensure that a remote path was 'passed. If it's blank then pass a "\" If Len(sRemotePath) = 0 Then 'Please note that no premptive checking of the 'remote path is done. If it does not exist for some 'reason. Unexpected results may occur. sRemotePath = "\" End If 'Check the local path and file to ensure 'that either the a file that exists was 'passed or a wildcard was passed. If InStr(sLocalFile, "*") Then If InStr(sLocalFile, " ") Then FTPUpload = "Error: Wildcard uploads do not work if the path contains a " & _ "space." & vbCRLF FTPUpload = FTPUpload & "This is a limitation of the Microsoft FTP client." Exit Function End If ElseIf Len(sLocalFile) = 0 Or Not oFTPScriptFSO.FileExists(sLocalFile) Then 'nothing to upload FTPUpload = "Error: File Not Found." Exit Function End If '--------END Path Checks--------- 'build input file for ftp command sFTPScript = sFTPScript & "USER " & sUsername & vbCRLF sFTPScript = sFTPScript & sPassword & vbCRLF sFTPScript = sFTPScript & "cd " & sRemotePath & vbCRLF sFTPScript = sFTPScript & "binary" & vbCRLF sFTPScript = sFTPScript & "prompt n" & vbCRLF sFTPScript = sFTPScript & "put " & sLocalFile & vbCRLF sFTPScript = sFTPScript & "quit" & vbCRLF & "quit" & vbCRLF & "quit" & vbCRLF sFTPTemp = oFTPScriptShell.ExpandEnvironmentStrings("%TEMP%") sFTPTempFile = sFTPTemp & "\" & oFTPScriptFSO.GetTempName sFTPResults = sFTPTemp & "\" & oFTPScriptFSO.GetTempName 'Write the input file for the ftp command 'to a temporary file. Set fFTPScript = oFTPScriptFSO.CreateTextFile(sFTPTempFile, True) fFTPScript.WriteLine(sFTPScript) fFTPScript.Close Set fFTPScript = Nothing oFTPScriptShell.Run "%comspec% /c FTP -n -s:" & sFTPTempFile & " " & sSite & _ " > " & sFTPResults, 0, TRUE Wscript.Sleep 1000 'Check results of transfer. Set fFTPResults = oFTPScriptFSO.OpenTextFile(sFTPResults, ForReading, _ FailIfNotExist, OpenAsDefault) sResults = fFTPResults.ReadAll fFTPResults.Close oFTPScriptFSO.DeleteFile(sFTPTempFile) oFTPScriptFSO.DeleteFile (sFTPResults) If InStr(sResults, "226 Transfer complete.") > 0 Then FTPUpload = True ElseIf InStr(sResults, "File not found") > 0 Then FTPUpload = "Error: File Not Found" ElseIf InStr(sResults, "cannot log in.") > 0 Then FTPUpload = "Error: Login Failed." Else FTPUpload = "Error: Unknown." End If Set oFTPScriptFSO = Nothing Set oFTPScriptShell = Nothing WScript.Echo "Process Completed (" & Now & ")" End Function可能包含有关确切错误的有用信息。在e - 块中执行e.printStackTrace();，将所有可用信息打印到标准输出。如果这无法解决问题，请在此处发布堆栈跟踪。

Answer 2

您无法操纵UI thread background thread，这就是您收到此错误的原因。

ClassName.this.runOnUiThread(new Runnable() {
                public void run() {
                //Do something on UiThread

                // enclose your UI manipulated code here in these braces.
            }
        });

无法在静态上下文中调用动态方法？

2 个答案: