调用File.toURI（）时的ANR

Question

The Google Play developer console, has reported that the File.toURI() method has caused an ANR (application not responding) error:

at libcore.io.Posix.stat(Native Method)
at libcore.io.ForwardingOs.stat(ForwardingOs.java:131)
at java.io.File.isDirectory(File.java:529)
at java.io.File.getAbsoluteName(File.java:1104)
at java.io.File.toURI(File.java:1062)
at com.mypackage.myclass.<init>(SourceFile:1234)

Is there an alternative way to do this on the main thread (because using a background thread seems like overkill)?

Answer 1

Doing tasks directly on the UI or main thread is not recommended. In your case, try AsyncTask . Look here for an example.

Answer 2

If the file path is already an absolute path and you already know whether the File is a directory:

public static String toURI(File f, boolean isDirectory) {
    try {
        String sp = slashify(f.getPath(), isDirectory);
        if (sp.startsWith("//")) {
            sp = "//" + sp;
        }
        return new URI("file", null, sp, null);
    } 
    catch (URISyntaxException x) {
        throw new Error(x);         // Can't happen
    }
}

private static String slashify(String path, boolean isDirectory) {
    String p = path;
    if (File.separatorChar != '/')
        p = p.replace(File.separatorChar, '/');
    if (!p.startsWith("/"))
        p = "/" + p;
    if (!p.endsWith("/") && isDirectory)
        p = p + "/";
    return p;
}