AsyncTask 不接受 double 类型的数据答案

【问题标题】：AsyncTask does not accpt data of type doubleAsyncTask 不接受 double 类型的数据
【发布时间】：2016-01-14 10:05:16
【问题描述】：

我在代码中创建了如下所示的 AsyncTask，以便通过 onPublishProgress 发布的值是 double 类型，但在运行时我收到以下发布的 logCat 错误

请帮我找出出现此错误的原因

代码：

this.mbtnShowComp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           mATComputations = new mATComputations();
            mATComputations.execute();
        }
    });

private class mATComputations extends AsyncTask <Void, Double, Void> {

    private int mI = 0;
    private double mResult;


    @Override
    protected Void doInBackground(Void... params) {
        Log.w(TAG, CSubTag.msg("mATComputations.doInBackground"));

        while (!isCancelled()) {
            this.mResult += (((++this.mI)/10) * (50));
            publishProgress(this.mResult);
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(Double... values) {
        super.onProgressUpdate(values);
        Log.w(TAG, CSubTag.msg("mATComputations.onProgressUpdate"));

        mtvComputations.setText(""+(values[0]));
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        Log.w(TAG, CSubTag.msg("mATComputations.onPostExecute"));
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();
        Log.w(TAG, CSubTag.msg("mATComputations.onCancelled"));
    }
}

logcat

FATAL EXCEPTION: AsyncTask #2
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime: Process: com.example.com.bt_11, PID: 953
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at android.os.AsyncTask$3.done(AsyncTask.java:300)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:  Caused by: java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.Void[]
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at com.example.com.bt_11.ActConnect2$mATComputations.doInBackground(ActConnect2.java:1902)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at android.os.AsyncTask$2.call(AsyncTask.java:288)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
    01-14 10:59:47.220 953-1958/com.example.com.bt_11 E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)

【问题讨论】：

第 1902 行是什么？
@EricB。它是私有类 mATComputations 扩展 AsyncTask

标签： android multithreading android-asynctask

【解决方案1】：

这将对您有所帮助：Object[] cannot be cast to Void[] in AsyncTask。

基本上，您的mATComputations 类和引用名称可能有错误（它们是否相同？）或者您将mATComputations 变量声明为AsyncTask 而不是您自己的类。

请重命名您的 mATComputations 类以具有正确的大写名称（例如 ATComputations）。

实例化和执行任务应该如下所示：

ATComputations mATComputations = new ATComputations();
mATComputations.execute();

【讨论】：