Cancel AsyncTask

Is it possible to cancel AsyncTask that has one line command in doInBackground that performs a 开发者_StackOverflow中文版very long operation,like

@Override
protected Boolean doInBackground(String... filename) {
    fetchfile(filename[0]);
    // ...
    // ...
    return ...;
}

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You can AsyncTask.cancel() to cancel. You can cancel it inside the fetchFile method at an appropriate place where you feel it will not introduce inconsistencies in your data or at a place where its easier to rollback.

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In your long run method, periodically check isCanceled, if it's true, return from function ASAP so that async thread may be closed. And you may call cancel() from any thread.