致命异常: AsyncTask #3 (执行doInBackground()时出错)

Question

当我运行下面的代码时，我得到了一个数组索引错误。

public class GetImageFileTask extends AsyncTask {

    private OnGetImageFileListener listener;

    public GetImageFileTask(OnGetImageFileListener listener) {
        this.listener = listener;
    }

    @Override
    protected Object doInBackground(Object[] params) {
        File imageFile = null;
        ImageHelper imageHelper = (ImageHelper) params[0];
        ImageView imageView = (ImageView) params[1];

        try {
            imageFile = imageHelper.getFileFromImageView(imageView);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return imageFile;
    }

    @Override
    protected void onPostExecute(Object imageFile) {
        listener.onGotImageFile((File) imageFile);
    }
}

我不明白为什么。这段代码可以在另一个项目中工作，但不能在我目前正在处理的项目中工作。这是错误日志。

02-13 17:20:21.073  30900-30985/app.protoype3 E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #4
Process: app.protoype3, PID: 30900
java.lang.RuntimeException: An error occured while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:300)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
        at java.util.concurrent.FutureTask.run(FutureTask.java:242)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:818)
 Caused by: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
        at app.protoype3.GetImageFileTask.doInBackground(GetImageFileTask.java:24)
        at android.os.AsyncTask$2.call(AsyncTask.java:288)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:818)

Answer 1

Caused by: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1

也许错误是你的参数长度是1？你如何执行你的AsyncTask？

你需要给task.execute(imageHelper, imageView)打电话。